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WO2013040741A1 - Procédé et système de transmission de données, et émetteur et récepteur - Google Patents

Procédé et système de transmission de données, et émetteur et récepteur Download PDF

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Publication number
WO2013040741A1
WO2013040741A1 PCT/CN2011/079820 CN2011079820W WO2013040741A1 WO 2013040741 A1 WO2013040741 A1 WO 2013040741A1 CN 2011079820 W CN2011079820 W CN 2011079820W WO 2013040741 A1 WO2013040741 A1 WO 2013040741A1
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WIPO (PCT)
Prior art keywords
matrix
transmitter
precoding matrix
precoding
receiver
Prior art date
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Ceased
Application number
PCT/CN2011/079820
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English (en)
Chinese (zh)
Inventor
张健
张元涛
张翼
王轶
周华
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Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to PCT/CN2011/079820 priority Critical patent/WO2013040741A1/fr
Priority to CN201180072531.6A priority patent/CN103718491B/zh
Publication of WO2013040741A1 publication Critical patent/WO2013040741A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0606—Space-frequency coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time coding
    • H04L1/0675—Space-time coding characterised by the signaling
    • H04L1/0681—Space-time coding characterised by the signaling adapting space time parameters, i.e. modifying the space time matrix

Definitions

  • the present invention relates to the field of communications, and in particular, to a data transmission method, system, transmitter, and receiver. Background technique
  • CoMP Coordinatd Mult-Point
  • LTE-A Long Term Evolution Advanced
  • the current CoMP technology mainly focuses on the closed-loop (with precoding matrix index PMI feedback) transmission field, and its transmission technology may include joint processing (JP: Joint Processing) and cooperative scheduling/beamforming (CS/CB, Coordination Scheduling/Beamforming), Explain the joint processing of JP.
  • JP Joint Processing
  • CS/CB Coordination Scheduling/Beamforming
  • FIG. 1 is a schematic diagram of JP transmission using CoMP between two cells as an example. As shown in Figure 1,
  • Tx1 and ⁇ 2 respectively represent the base station 1 and the base station 2, where the base station represents various types of transmitters capable of CoMP operation, such as an eNB, a remote radio head RRH, etc., the base station configures a base transmit antenna, and Rx represents a user receiver, and the root is configured. Receive antenna.
  • the MIMO (Multiple Input Multiple Output) channel matrix between the base station 1, the base station 2, and the user is represented as H 2 , which are both x N and a dimensional matrix.
  • the L-channel data stream is sent to the user, and the base station 1 and the base station 2 respectively map the N-channels to their own multiple antennas using the N, x L-dimensional precoding matrix ⁇ , ⁇ 2 for transmission.
  • N t , L take a positive integer
  • L L ⁇ N f .
  • the vector symbol y ⁇ 3 ⁇ 43 ⁇ 4 ⁇ 3 ⁇ 4 y ⁇ + ⁇ + ⁇ received by the client, where ⁇ represents the noise vector.
  • the UE is required to ensure that the current state of the channel precoding matrix index (PMI: Precoding Matrix Index) feedback, precoding matrix is selected as the base station side, two suggestions.
  • PMI Precoding Matrix Index
  • the inventors have found that the above-mentioned techniques have the following drawbacks:
  • the network side considers the feedback burden that can be withstood, there is a limit on the total amount of feedback, such as currently not allowed.
  • the user performs feedback; or the network allows feedback, but the PMI fed back by the user cannot accurately reflect the current channel state, such as the user's high-speed motion situation, which will have a negative impact on the closed-loop CoMP transmission performance.
  • An object of the embodiments of the present invention is to provide a data transmission method, system, transmitter, and receiver, where multiple transmitters can pass a spatial frequency block code (SFBC) data stream through a phase rotation matrix and/or a pre-
  • the coding matrix W transmits to the receiver, and selects the precoding matrix W and/or the phase rotation matrix with the resource block RB as the granularity, and does not require the receiver to perform PMI feedback, and does not allow user feedback or PMI feedback to be inaccurate.
  • open-loop space diversity CoMP transmission is implemented.
  • a data transmission method for multi-point coordinated transmission based on transmit diversity, the method comprising:
  • the transmitter selects a phase rotation matrix and/or a precoding matrix; wherein the transmitter selects the phase rotation matrix and/or the precoding matrix by using a resource block as a granularity; or the transmitter selects a phase rotation matrix fed back by the receiver and/or Or precoding matrix;
  • the transmitter maps at least one set of SFBC data streams through a selected phase rotation matrix, or through a precoding matrix, or sequentially through a phase rotation matrix and a precoding matrix to an antenna port of the transmitter; through an antenna corresponding to the antenna port Transmitted to the receiver; each set of SFBC data streams includes two streams of data on two subcarriers.
  • a data transmission method comprising: receiving, by a receiver, one or more SFBC data streams sent by a transmitter; the receiver performing channel estimation by using a demodulation reference signal to obtain The effective channel is used to demodulate the received SFBC data stream using the obtained equivalent channel to obtain the SFBC data stream sent by the transmitter.
  • a transmitter comprising: a selection unit for selecting a phase rotation matrix and/or a precoding matrix; The selecting unit selects the phase rotation matrix and/or the precoding matrix by using a resource block as a granularity; or the selecting unit selects a phase rotation matrix and/or a precoding matrix fed back by the receiver; a processing unit, the processing The unit is configured to map at least one set of SFBC data streams through the selected phase rotation matrix, or through a precoding matrix, or sequentially through a phase rotation matrix and a precoding matrix to an antenna port of the transmitter;
  • An antenna unit comprising a plurality of antennas for transmitting SFBC data streams mapped to the antenna ports to a receiver; each set of SFBC data streams comprising two data streams on two subcarriers.
  • a receiver comprising: a third receiving unit, configured to receive a data stream sent by one or more transmitters;
  • a channel estimation unit configured to perform channel estimation by using a demodulation reference signal to obtain an equivalent channel
  • a demodulation unit configured to demodulate the received data stream by using the obtained equivalent channel to obtain a data stream sent by the transmitter.
  • a data transmission system comprising:
  • each transmitter comprising: a phase rotation matrix and/or a precoding matrix used for granular selection of resource blocks, or a selection unit for selecting a phase rotation matrix and/or a precoding matrix fed back by the receiver; Passing at least one set of SFBC data streams through a phase rotation matrix selected by the selection unit, or through a precoding matrix, or sequentially through a phase rotation matrix and a precoding matrix to a processing unit of the transmitter antenna port; the SFBC of the antenna port
  • the data stream is sent to the receiver and includes antenna elements of multiple antennas; each group of SFBCs includes two data streams on two subcarriers;
  • a receiver comprising: a receiving unit that receives a data stream transmitted by more than one transmitter; a channel estimation unit that performs channel estimation using the demodulation reference signal to obtain an equivalent channel; and receives the obtained equivalent channel pair
  • the data stream is demodulated to obtain a demodulation unit of the data stream.
  • a computer readable program wherein when the program is executed in a transmitter, the program causes a computer to execute the above in the transmitter Data transmission method.
  • a storage medium storing a computer readable program, wherein the computer readable program causes a computer to execute the above data transmission method in a transmitter.
  • a computer readable program wherein when the program is executed in a receiver, the program causes a computer to execute the above data transmission method in the receiver.
  • a storage medium storing a computer readable program, wherein the computer readable program causes a computer to execute the above data transmission method in the receiver.
  • the transmitter can form the data stream into a space frequency block code
  • phase rotation matrix and/or precoding matrix W, and selects the phase rotation matrix (and the precoding matrix W at the granularity of the resource block RB) to support DM-RS demodulation ; Does not require the receiver to perform ⁇ feedback, also applies to scenes that do not support user feedback or ⁇ feedback is not accurate.
  • FIG. 1 is a schematic diagram of JP transmission taking CoMP between two cells as an example
  • 2 is a schematic diagram of an SFBC transmit diversity transmission process under SU-MIMO
  • FIG. 3 is a flowchart of a data transmission method according to Embodiment 1 of the present invention.
  • Figure 5 is a flowchart of a data transmission method according to Embodiment 3 of the present invention.
  • FIG. 6 is a block diagram showing the structure of a transmitter in Embodiment 4 of the present invention.
  • Figure 7 is a block diagram showing the structure of a transmitter of Embodiment 5 of the present invention.
  • Figure 8 is a block diagram showing the configuration of a receiver in Embodiment 6 of the present invention.
  • Figure 9 is a block diagram showing the configuration of a transmission system of Embodiment 7 of the present invention. Detailed ways
  • the inventor considers that the open loop transmission does not require the user to perform PMI feedback in the process of implementing the present invention, and is more suitable for a scenario that does not support user feedback or PMI feedback is inaccurate.
  • a CoMP transmission method, system based on transmit diversity, and a transmitter and receiver thereof are provided.
  • an open-loop CoMP transmission is constructed based on the Space Frequency Block Code (SFBC) of Rel.
  • SFBC Space Frequency Block Code
  • SU-MIMO single-user multiple-input multiple-output
  • the SFBC transmission process under SU-MIMO will be described below by taking FIG. 2 as an example.
  • the number of antennas of the transmitter 201 and the receiver 202 is 2, the subcarrier includes the subcarrier fl and the subcarrier f2, and the data stream to be transmitted on the subcarrier fl includes s .
  • the data stream that needs to be sent on subcarrier f2 includes, .
  • the data stream sent by the above transmitter is represented by a vector symbol, indicating s . Conjugation; representation of the conjugate. > ⁇ And y 2 represents the receiver 202 received on subcarriers fl and f2 data streams subcarrier symbol vectors.
  • the two antennas of the transmitter 201 respectively transmit s on the subcarrier fl. , , Send s on subcarrier f2.
  • receiver 202 is in the sub-carrier
  • the receiver 202 After the receiver 202 receives the data stream transmitted by the transmitter 201 on the subcarrier fl and the subcarrier f2, the receiver demodulates and recovers the data stream, for example:
  • the receiver 202 can be restored using the following equation (3)
  • the receiver uses the following equation (4) to recover
  • the transmitter is configured with a root transmit antenna
  • the receiver is configured with a root receive antenna.
  • ⁇ is greater than 2
  • the transmit end can use the virtual antenna mapping method to map the ⁇ transmit antenna to 2 antenna ports, so that the SFBC can still be transmitted.
  • the receiver receives the same manner as in the previous recovery methods, except where H is the ⁇ -dimensional matrix.
  • N f takes a positive integer.
  • CoMP transmission based on transmit diversity is adopted, that is, open-loop CoMP transmission is performed on the basis of SFBC, and phase rotation is performed based on demodulation consideration of demodulation reference signal (DM-RS) in CoMP transmission.
  • DM-RS demodulation reference signal
  • the matrix D and/or the precoding matrix W are adjusted according to the granularity of the resource block RB to facilitate DM-RS demodulation.
  • FIG 3 is a flow chart showing the data transmission method of Embodiment 1 of the present invention. As shown in Figure 3, the method includes:
  • Step 301 the transmitter selects a phase rotation matrix) and/or a precoding matrix
  • the difference from the prior art is that the phase rotation matrix and/or The precoding matrix W is selected according to the granularity of the resource block RB, and the resource block can be adjusted RB by RB to support DM-RS demodulation in CoMP transmission;
  • the receiver can also feed back the phase rotation matrix and the precoding matrix.
  • the transmitter directly selects the phase rotation matrix ⁇ > and the precoding matrix W fed back by the receiver to transmit the data stream.
  • Step 302 The transmitter maps at least one group of SFBCs to the antenna port of the transmitter through a selected phase rotation matrix), or through a precoding matrix W, or sequentially through a phase rotation matrix, and a precoding matrix W.
  • the antenna corresponding to the antenna port is sent to the receiver; or mapped to the antenna and sent to the receiver;
  • Each set of SFBCs includes two sub-carriers on the SFBC so* wave; for example, each column from left to right corresponds to subcarrier 2 and subcarrier 1; s . Indicates s . Total
  • the two data streams may be processed by a modulation and a rate matching process, and the processing of the modulation and the rate matching is similar to the prior art, and details are not described herein.
  • the SFBC data stream may be rotated through the phase matrix only for frequency diversity; the SFBC data stream may also pass through the precoding matrix only, or the data stream may be sequentially passed through the rotated phase matrix and the precoding matrix.
  • the precoding matrix can be used to map the SFBC data stream to ⁇
  • the root antenna is similar to the case of equal to 2; in the case where the precoding matrix is not used, for the case where the number of antennas of the transmitter is N f > 2, the antenna of the transmitter can be mapped to 2 by virtual antenna mapping.
  • the antenna port is then transmitted through the antenna corresponding to the antenna port, so that the SFBC transmission can still be used, and the mapping manner is similar to the prior art, and details are not described herein again.
  • each group can be sent in sequence.
  • SFBC transmits at each transmitter, transmitting It is not directly transmitted to the air interface for merging, but the SFBC is subjected to phase rotation matrix, or through precoding matrix W, or sequentially through phase rotation matrix) and precoding matrix W, which can be complicated according to its influence on performance.
  • the compromise of degree is appropriately determined by the above embodiment.
  • the precoding matrix W and/or the phase rotation matrix are adjusted according to the granularity of the resource block RB to support DM-RS demodulation, which does not need
  • the receiver performs PMI feedback, which is also applicable to scenarios where user feedback is not supported or PMI feedback is not accurate.
  • the plurality of sets of SFBCs are phase rotated by a matrix to obtain frequency diversity.
  • the phase rotation matrix is referred to as a matrix
  • the precoding matrix is referred to as a matrix ⁇ .
  • the transmitter can select the precoding matrix ⁇ RB by RB in a predetermined manner. among them,
  • the precoding matrix W used by the transmitter is the same as or different from the precoding matrix W used by other transmitters.
  • the transmitter can individually select its precoding matrix W, independent of the total number of antennas of all transmitters.
  • the transmitter can cyclically select the precoding matrix on a RB-by-RB basis in a predetermined order.
  • the number of precoding matrices W used per loop is less than or equal to the number of precoding matrices available in the codebook. Wherein, a predetermined number of precoding matrices may be selected in advance and then the precoding matrix W may be cyclically used in a predetermined order.
  • the number of precoding matrices available in the codebook is N 2
  • the predetermined number is M 2
  • the method specifically includes: the number of data streams in the codebook is 2 Selecting M 2 precoding matrices from corresponding N 2 available precoding matrices, where M 2 ⁇ N 2 , M 2 , N 2 are positive integers; and resource block (RB ) is in M 2 precoding matrices W Select the precoding matrix ⁇ .
  • the number of layers is always greater than 1, and the number of antennas of the transmitter is two, thus, when two antennas are specified in the standard
  • the precoding matrix used by the transmitter per cycle is the same as the precoding matrix selected by other transmitters, but the order of selecting the precoding matrix may be the same or different.
  • the transmitter may be in RB-by-RB order in the reverse order of the order in which the other transmitters select the precoding matrices, ie, other
  • the transmitter selects the precoding matrix in a reverse order cyclically to select the precoding matrix.
  • the order of the other transmitters selecting the precoding matrix is w, , w 2 , w 3 in each cycle, and then the transmitter selects the order of the precoding matrix.
  • the transmitter can also select the order of the precoding matrix in a cyclic shift manner together with other transmitters, and still use three matrices, ⁇ , ⁇ as an example for description.
  • the transmitter is a transmitter 1, and there are also three transmitters, namely a transmitter 2, a transmitter 3 and a transmitter 4. If the order of the precoding matrix is sorted in a cyclic shift manner, the order of the transmitter 1 is WW 2 , W 3 , the order of the transmitter 2 is ⁇ , and the order of the transmitter 3 is w 3 , w 2 , w, the order of the transmitter 4 is ww 2 , w 3 .
  • the transmitter can also arbitrarily select the matrix W to be used, RB. For example, when the number of antenna ports is 2, the transmitter can arbitrarily select one matrix W from Table 1 every RB. The order of other transmitters to select the precoding matrix can still be ⁇ ⁇ 3 in turn.
  • the precoding matrix can be selected from the 4-antenna codebook.
  • the precoding matrix can be selected from the 8 antenna codebooks, and the 8 antennas can be virtually mapped to 4 antennas.
  • the precoding matrix is selected according to the case of the 4-antenna codebook, similar to the above, here Let me repeat.
  • the transmitter selects the precoding matrix by using the precoding matrix of all the transmitters as a whole, including:
  • the transmitter selects the precoding matrix by using the precoding matrix of all the transmitters as a whole, including:
  • the transmitter maps the total number of antennas into a number of antennas in the code book by using a virtual antenna mapping manner, and then cyclically or randomly selecting from a first predetermined number of multiple precoding matrices; the first predetermined number is less than or equal to the codebook
  • the number of precoding matrices available in the precoding matrix in the available precoding matrix corresponding to the number of data streams in the codebook is 2.
  • the number of precoding matrices available in the codebook is ⁇ , and the predetermined number is one.
  • the method may include: the number of data streams in the antenna codebook is 2 A precoding matrix may be selected from the precoding matrix; wherein, ⁇ ⁇ , , ⁇ ⁇ are positive integers; the precoding matrix as a whole is sequentially selected in the precoding matrix on a resource-by-resource block basis.
  • the precoding matrix W used is any four of the 16 precoding matrices corresponding to the 4-antenna codebook specified in the standard, or only 16 precodings corresponding to the 4-antenna codebook.
  • the last 4 precoding matrices in the matrix that is, the precoding matrices corresponding to the codebook indexes 12-15. As shown in table 2.
  • the corresponding vector u can be obtained first through Table 2, and then the precoding matrix is obtained by u.
  • the precoding matrix is obtained similarly to the prior art and will not be described in detail herein.
  • the 1-2th row of the precoding matrix corresponds to a precoding matrix of one transmitter
  • the 3-4th row corresponds to a precoding matrix of another transmitter.
  • one matrix W can be arbitrarily selected from the 16 matrices. For example, if the number of antennas in the transmitter and the other transmitter is 4, and the number of antennas is 8, the number of data streams in the 8-antenna codebook is 2, and the available precoding matrix is selected. Precoding matrices.
  • the number of antennas supported in the current code book is 2, 4, 8.
  • the total number of antennas of all base stations is not the above three values, it can be mapped to 2, 4 or 8 by virtual antenna mapping, and then it can be There is a choice of the overall precoding matrix in the codebook.
  • 3 transmitters, each with 2 antennas, and the total number of antennas is 6, can be virtualized into 4 antennas, for example, the number of first transmitter antennas can be virtualized to 2, and the second transmission The number of antennas of the machine is virtualized to 1, and the number of antennas of the third transmitter is virtualized to 1, and then the overall precoding matrix is selected in the 4-antenna codebook.
  • the selection method is similar to the above, and can be used in a 4-antamble, layer 2 codebook.
  • the transmitter can select the matrix D according to the granularity of the RB.
  • the transmitter uses a rotational phase matrix D that is the same or different from the rotational phase matrix D used by other transmitters.
  • the matrix D is a 2 X 2 dimensional diagonal array, usually having the following shape
  • Equation: D where the angle ⁇ represents the nth transmitter, the corner symbol k identifies the kth RB, that is, the RB index, and the corner markers 1 and 2 are used to distinguish the phase rotation of the two data streams.
  • the diagonal elements may be equal or unequal, and for different transmitters, the diagonal elements may be equal or unequal.
  • matrix D can also be selected as the standard CDD transmission method.
  • the defined matrix D, gp The matrix D can also be selected in other ways, not listed.
  • the SFBC may be mapped to multiple antennas of the transmitter by any existing technology
  • L represents the number of data streams j
  • SFBC indicates the number of two carriers 1 and 2 to be transmitted to the receiver.
  • the matrix D can be selected as the method according to the above embodiment.
  • k is the RB index
  • the precoding matrix W is selected in the 2 antennas and the number of layers having 2 codes.
  • N available precoding matrices may be specified in the codebook, N 3 , and then W is RB-by-RB.
  • the precoding matrix is cyclically selected, or for each RB, one W is randomly selected in 2 antennas and 3 precoding matrices with a layer number of 2 codebooks.
  • the transmitter can transmit the data stream to the receiver through the matrix D and the matrix W, and select the matrix D and the matrix W with the resource block RB as the granularity to support the DM-RS demodulation.
  • the receiver does not need to perform PMI feedback. It is also applicable to scenarios that do not support user feedback or PMI feedback is inaccurate. Open-loop diversity CoMP transmission is implemented.
  • the method may further include: the transmitter may pass the demodulation reference signal (DM-RS) through the phase rotation matrix D, or via the precoding matrix ⁇ Or transmitting to the receiver via the phase rotation matrix D and the precoding matrix W (see step 303), so that the receiver performs channel estimation according to the DM-RS to obtain an equivalent channel, so that the receiver according to the equivalent channel
  • the data stream sent by the transmitter that is, the vector symbol, is demodulated and recovered to obtain the data stream.
  • the DM-RS can be simultaneously mapped to the antenna with the SFBC data stream and sent to the receiver through the antenna.
  • the indicator ce/ obtains the channel quality indicator ce/' of the current open-loop COMP ; wherein the CQI can be obtained by adding ⁇ 3 ⁇ 4/ to the CQI;
  • the data stream is processed according to the current channel quality indicator C2/', and the processed data stream is converted into an SFBC format, sent to the phase rotation matrix D, or the precoding matrix ⁇ , or sequentially rotated by phase The matrix D and the precoding matrix W; wherein processing the data stream according to the current channel quality indicator ce/' may include coding and modulation mode selection, rate matching, etc. of the data stream, similar to the prior art, where No longer.
  • the receiver since the phase rotation matrix D and the precoding matrix W are changed from RB to RB, it is possible for the receiver to feed back the matrix D and/or the precoding matrix W to some extent.
  • the receiver can assume that the diagonal elements of the matrix D are all from the QPSK constellation point, and the receiver selects the matrix D that it wants according to the current channel condition.
  • the precoding matrix W can be selected in the codebook, and the selected phase will be selected.
  • the rotation matrix D and/or the precoding matrix are fed back to the base station for reference by the base station for the next transmission. Therefore, in this case, the method may further comprise the steps of:
  • the transmitter receives a phase rotation matrix D and/or a precoding matrix fed back by the receiver for use by the transmitter in transmitting the data stream.
  • Fig. 4 is a flow chart showing the data transmission method of the embodiment 2 of the present invention. As shown in Figure 4, the method includes:
  • Step 401 The receiver receives more than one data stream sent by the transmitter.
  • the receiver receives the data stream on the carrier transmitted by the transmitter on a different carrier, and the data stream can be a vector symbol.
  • Step 402 The receiver performs channel estimation by using a demodulation reference signal (DM-RS) to obtain an equivalent channel.
  • DM-RS demodulation reference signal
  • the one transmitter may send the DM-RS through the respective phase rotation matrix D, or the precoding matrix W, or sequentially through the phase rotation matrix D and the precoding matrix D, and after receiving the DM-RS, the receiver receives the DM-RS.
  • An equivalent channel on a certain density RE can be estimated, and an equivalent channel on each RE is obtained by an interpolation algorithm.
  • Step 403 Demodulate the received data stream by using the obtained equivalent channel to obtain the data stream.
  • the existing SFBC detection technology can be used to demodulate and recover the data stream sent by the transmitter to obtain the data stream.
  • the user needs to add feedback based on the SU-MIM0 feedback mode to indicate CQI selection in the CoMP transmission mode.
  • the method further includes:
  • the receiver feeds back the original SU-MIM0 channel quality indicator C2/ and the channel quality indicator change ⁇ 3 ⁇ 4/ to the transmitter.
  • the channel quality indicator ce/' of the current open-loop CoMP transmission can be obtained according to the above information, and the ce/' is used for modulation coding mode selection, rate matching, and the like.
  • the feedback of ⁇ 3 ⁇ 4/ enables the transmitter to select more accurate transmission parameters for open-loop CoMP transmission, such as modulation and coding, rate matching, etc., so that the performance advantages of CoMP transmission can be more fully utilized.
  • the method further includes:
  • the receiver selects a phase rotation matrix and/or a precoding matrix according to current channel conditions; a diagonal element of the phase rotation matrix is from a QPSK constellation point; the precoding matrix is selected from a codebook; and the selected phase rotation matrix and/or Or the precoding matrix is fed back to the transmitter for use by the transmitter for the next transmission.
  • the receiver does not need to perform PMI feedback through CoMP transmission based on transmit diversity, and the method is also applicable to scenarios that do not support user feedback or PMI feedback is inaccurate.
  • the phase rotation matrix D and/or the precoding matrix W can also be fed back to the transmitter for use by the transmitter for the next transmission, and the original SU-MIM0 channel quality indicator CQ/ and channel quality indicator can also be used.
  • the amount of change ⁇ 3 ⁇ 4/ is fed back to the transmitter, so that after obtaining the above information, the transmitter can obtain the channel quality indicator C2/' of the current open-loop CoMP transmission according to the above information, and use the ce/' to perform modulation and coding mode selection and rate. Matching and other processing.
  • FIG. 5 is a flowchart of a data transmission method according to Embodiment 3 of the present invention.
  • the transmitter obtains (3 ⁇ 4/' according to the ⁇ 3 ⁇ 4/ and C2/ feedback from the receiver, and performs coding and modulation mode selection and rate matching on the data stream by using the C2/', and then performs frequency through the matrix D. separation, Then, the precoding matrix w is mapped to the self antenna as an example for description.
  • a receiver R receives a data stream on a different carrier transmitted by a plurality of transmitters, that is, an SFBC transmitter
  • Each transmitter 7 The data stream of each group of SFBCs transmitted to the receiver R on each subcarrier is an L:2 way stream.
  • the precoding matrix ⁇ is an N, x L dimensional matrix; the matrix D is an Lx L matrix.
  • the number of antennas of the receiver is greater than or equal to 2, and L is less than or equal to the number of receiver antennas.
  • N t , L and n take a positive integer.
  • the transmitting end :
  • Step 501 Each of the plurality of transmitters receives a channel quality indicator CQI and a channel quality indicator change amount under the original SU-MIM0 transmission condition fed back by the receiver.
  • Step 502 The multiple transmitters obtain a current channel quality indicator CQI according to the change amount ⁇ 3 ⁇ 4/ and the channel quality indicator CQI under the original SU-MIM0 transmission condition;
  • Step 503 Process the SFBC data stream according to the current channel quality indicator C2/'; wherein the processing may include performing transmission parameter selection on the data stream, such as coding modulation mode selection and rate matching;
  • SFBC transmission For SFBC transmission, only a single data stream is generated, and the data stream is modulated and coded, and mapped to the SFBC code format for transmission on the antenna.
  • Step 504 The processed SFBC data stream is sequentially passed through the matrix D, and precoded by the precoding matrix W and mapped to its own antenna port.
  • each of the W transmitters sequentially streams the SFBC data through the matrix D and transmits it to the receiver via the precoding matrix W mapped to its own antenna;
  • the multiplexed data flows through the matrix D to obtain the gain of the frequency diversity, as described in Embodiment 1, and is not described herein again;
  • each transmitter selects the matrix D and the precoding matrix W used by the resource block RB as a granularity, and the manner of selecting the precoding matrix W and the matrix is similar to that in Embodiment 1; in this embodiment, each The transmitter transmits 2 subcarriers through its own antenna The two channels of data are sent to the receiver; wherein the two channels of data are precoded by the precoding matrix, and then transmitted to the receiver in the form of vector symbols.
  • Step 505 Each transmitter further sends a demodulation reference signal (DM-RS) to the receiver R through its own matrix D and a precoding matrix.
  • DM-RS demodulation reference signal
  • the demodulation reference signal and the data stream can be simultaneously transmitted to the receiver R through the antenna.
  • Step 506 the receiver R receives the SFBC data stream and the demodulation reference signal (DM-RS) sent by multiple transmitters;
  • DM-RS demodulation reference signal
  • the receiver R can receive the SFBC and the DM-RS simultaneously transmitted by the M transmitters, where the vector symbols received on one subcarrier, such as the subcarrier fl, can be expressed as:
  • a subcarrier such as a vector symbol received on subcarrier f2
  • a subcarrier can be represented as
  • equations (5) and (6), and /3 ⁇ 4 represent the noise vector.
  • Step 507 the receiver R performs channel estimation by using the obtained DM-RS to obtain an equivalent channel
  • the matrix D and the matrix W may be determined according to the RB, as described in Embodiment 1, such that after the receiver R obtains the equivalent channel, the SU-MIM0 method described above may be utilized (eg, equations (3) and ( 4) The method shown) performs demodulation recovery of SFBC data symbols, ie for equation (5) and
  • the receiver may increase ⁇ (3 ⁇ 4/ feedback) based on the SU-MIM0 feedback mode, such that the method may further include the step of: the receiver will be the original SU - the MIM0 channel quality indicator CQI and the channel quality indicator change amount ⁇ 3 ⁇ 4/ are fed back to the transmitter.
  • the channel quality indicator C2/' of the current open-loop CoMP transmission can be obtained according to the above information, and the C2/' performs modulation and coding mode selection, rate matching, etc.
  • the specific manner of obtaining the channel quality indicator change amount ⁇ 3 ⁇ 4/ is as described in Embodiment 3, and details are not described herein again, and the step may be performed at steps 506 and 507. , before or after 508, can be determined according to actual needs.
  • the method may further comprise the steps of: the receiver selecting a phase rotation matrix D and/or a precoding matrix W according to current channel conditions; a diagonal element of the phase rotation matrix D is from a QPSK constellation point, and the precoding matrix W is from a codebook The selected phase rotation matrix D and/or the precoding matrix W are fed back to the transmitter for use in the next transmission of the transmitter.
  • step 504 matrix D and matrix W do not necessarily have to exist at the same time, and may be appropriately adjusted according to their impact on performance and compromise of implementation complexity.
  • each transmitter can also directly send the processed SFBC data stream to the precoding matrix W for precoding, and then send it to the receiver via the antenna.
  • the receiver R can receive the SFBC data stream and the DM-RS simultaneously transmitted by the transmitters, wherein the SFBC data streams received on the subcarriers fl and f2 are equivalent to equations (5) and ( 6)
  • the matrix D is an identity matrix.
  • the receiver R performs channel estimation using the obtained DM-RS to obtain an equivalent channel; wherein the receiver R can estimate an equivalent channel on a certain density RE, and then obtain each by an interpolation algorithm.
  • the receiver R can utilize the obtained equivalent channel pair to receive the SFBC.
  • the data stream is demodulated and restored; similarly to the embodiment 3, the SFBC data stream can be demodulated and restored by using equations (7) and (8), and details are not described herein again.
  • each transmitter may also send the processed SFBC data stream directly to matrix D for frequency diversity and then transmit to the receiver via the antenna.
  • the receiver R can receive the SFBC data stream and the DM-RS simultaneously transmitted by the transmitters, wherein the SFBC data streams received on the subcarriers fl and f2 are equivalent to equations (5) and ( 6)
  • the matrix W is an identity matrix.
  • the receiver R performs channel estimation using the obtained DM-RS to obtain an equivalent channel; wherein the receiver R can estimate an equivalent channel on a certain density RE, and then obtain each by an interpolation algorithm.
  • the equivalent channel on the RE, ie H e ⁇ H i D i .
  • the receiver R can demodulate and recover the received SFBC data stream by using the obtained equivalent channel; similar to Embodiment 3, the SFBC data stream can be solved by using equations (7) and (8). The recovery is resumed and will not be described here.
  • the transmitter when the transmitter configures N t root transmit antennas, when N t >2, the transmitter can map the N, root transmit antennas to 2 antenna ports using a virtual antenna mapping method.
  • SFBC transmission can still be used.
  • a portion of the transmitter's SFBC data stream passes only through the matrix D
  • the SFBC data stream of the partial transmitter passes only through the matrix W
  • the SFBC data stream of the partial transmitter passes through the matrix in sequence.
  • the matrix W is taken as an identity matrix.
  • the equivalent matrix can be used to recover the SFBC data symbols by using the above method, that is, the formulas (7) and (8) respectively Restore s. with .
  • the MIM0 channel matrix between receivers R is represented as H, ., which is a 2 X 2-dimensional matrix.
  • step 504 the two transmitters sequentially use the matrix sum, their own precoding matrices ⁇ and 2 , map the SFBC data stream to its own two antenna ports, and pass the corresponding antenna port 2 Antennas are sent to the receiver;
  • each transmitter selects the precoding matrix ⁇ and w 2 used in the granularity of the resource block RB, and the matrix ⁇ 2 , and selects the manner of the precoding matrix ⁇ and ⁇ and the manner of selecting the matrix and the ⁇ , as described in Example 1;
  • the precoding matrix is selected in the following manner:
  • the first mode the manner in which the two transmitters respectively select the precoding matrix
  • the two transmitters cyclically select the precoding matrices ⁇ and 2 RB by RB in a predetermined order, and the number of precoding matrices used in each loop is n (n 3), as shown in Table 1.
  • n the number of precoding matrices used in each loop.
  • the three precoding matrices are in turn W (1) , W (2) , W (3).
  • the precoding matrices selected by the two transmitters may be the same or different.
  • one of the transmitters cycles in the order of W1, W(2), W(3).
  • the precoding matrix is selected locally, and the other transmitter cyclically selects the precoding matrix 2 in the reverse order of the one transmitter, that is, in the order of W (3), W (2), and W1.
  • the above three precoding matrices are three precoding matrices specified by the two antenna codebooks, as shown in Table 1.
  • the second way the way two transmitters select the precoding matrix separately
  • One of the two transmitters cyclically selects the precoding matrix on a RB-by-RB basis in a predetermined order, and the other transmitter randomly selects the precoding matrix 2 , and the number of precoding matrices used per loop is 3 .
  • the precoding matrices selected by the two transmitters may be the same or different.
  • one of the transmitters cycles in the order of W1, W(2), W(3).
  • the precoding matrix is selected, and the three precoding matrices are two antenna codebooks and three predetermined precoding matrices having a layer number of two, as shown in Table 1.
  • the other transmitter arbitrarily selects the precoding matrix 2 in each cycle, for example, the three precoding matrices used in each cycle can It is randomly selected from the three precoding matrices specified in the 2-antenna codebook.
  • the third way the precoding matrix of 2 transmitters as a whole
  • the total number of the two transmitter antennas is four, so that the precoding matrix W as a whole can be cyclically or randomly selected from the four antenna codebooks and the specified 16 precoding matrices having a layer number of two.
  • M available precoding matrices may be specified, M 16, and then the precoding matrix W is cyclically selected RB by RB between the M precoding matrices, that is, the W value is changed RB by RB, and each M RB forms a loop period.
  • random selection means that each RB randomly selects one W use among the available 16 precoding matrices.
  • step 504 the matrix D used by the two transmitters is also selected according to the granularity of the resource block RB, as described in Embodiments 1 and 3, and details are not described herein again. .
  • the number of antennas configured by the transmitter is ⁇ > 2
  • the 4 ⁇ 2 -dimensional precoding matrix W can be used to map the SFBC data to 4 transmit antennas, or the root antenna can be mapped to 2 antenna ports by means of virtual antenna mapping.
  • SFBC transmission can still be used, and details are not described here.
  • the transmitter can transmit the SFBC data stream to the receiver through the matrix 0, and/or the precoding matrix W, and select the precoding matrix W and the matrix D with the resource block RB as the granularity.
  • the receiver does not need PMI feedback, and it is also applicable to scenarios that do not support user feedback or PMI feedback is not accurate.
  • the embodiment of the present invention further provides a transmitter and a receiver, as described in Embodiment 4 to Embodiment 5 below. Since the principle of solving the problem by the transmitter and the receiver is similar to the above-described data transmission method based on the transmitter and the receiver, the implementation of the transmitter and the receiver can be referred to the implementation of the method, and the repetition will not be repeated.
  • FIG. 6 is a block diagram showing the configuration of a transmitter in Embodiment 4 of the present invention.
  • the transmitter includes: a selecting unit 601, a processing unit 602, and an antenna unit 603 including a plurality of antennas; a selecting unit 601, configured to select a phase rotation matrix D and/or a precoding matrix W; wherein the selecting unit selects the phase rotation matrix and/or the precoding matrix by using a resource block as a granularity; or selecting a receiver feedback a phase rotation matrix and/or a precoding matrix;
  • the processing unit 602 is configured to: map the at least one set of SFBC data streams to the antenna of the transmitter through the selected phase rotation matrix 0, or through the precoding matrix W, or sequentially through the phase rotation matrix D and the precoding matrix W;
  • An antenna unit 603 of a plurality of antennas is configured to transmit SFBC data streams mapped to the antennas to a receiver; each set of SFBC data streams includes two data streams on two subcarriers.
  • the processing unit 602 may map the SFBC data stream only through the selected phase rotation matrix D or only through the precoding matrix W, or may sequentially map to the transmitter through the phase rotation matrix D and the precoding matrix W. Antenna (the case of passing through the matrices D and W is shown in the figure).
  • the transmitter when the SFBC data is transmitted to the receiver through the matrix D, the number of antennas of the transmitter is Nf >2, and the transmitter further includes: a mapping unit (not shown), where the mapping unit uses The antenna of the transmitter is mapped to two antenna ports by using virtual antenna mapping.
  • the selecting unit 601 can select the precoding matrix according to a predetermined manner, as described in Embodiments 1 and 3, which will be exemplified below.
  • the precoding matrix W selected by the selection unit 601 is the same as or different from the precoding matrix selected by the other transmitter.
  • each transmitter selects a respective precoding matrix
  • the selecting unit 601 cyclically selects the precoding matrix W in a predetermined order, and the number of precoding matrices used in each loop is less than or equal to the codebook.
  • the number of precoding arrays available in is cyclically selected from a 2-day line code book and three pre-coding matrices with a layer number of two.
  • the selection unit 601 uses the same precoding matrix used in each cycle as the precoding matrix used by other transmitters, and selects precoding in an order different or identical to the order in which the other transmitters select the precoding matrix.
  • the matrix W, or the selection unit 601 arbitrarily selects the precoding matrix w used for each loop.
  • the selecting unit 601 selects the precoding matrix as a whole of the precoding matrices of all the transmitters, including:
  • the selecting unit 601 selects the precoding matrix by using the precoding matrix of all the transmitters as a whole, including:
  • a number of precoding matrices may be used, where the plurality of precoding matrices are precoding matrices in an available precoding matrix corresponding to the number of data streams in the codebook.
  • the method includes: combining the precoding matrix W of the transmitter and another transmitter precoding matrix W as a whole cyclically or randomly from the first predetermined number of precoding matrices. Ground selection; the first predetermined number is less than or equal to the number of precoding matrices available in the codebook. For example, it is selected from a 4-antenna codebook and 16 pre-coding matrices having a layer number of 2, as described in Embodiments 1 and 3.
  • the selecting unit 601 is further configured to select the matrix D, wherein, for the same resource block, the rotating phase matrix D selected by the selecting unit 601 is the same as or different from the rotating phase matrix D selected by the other transmitters.
  • the specific selection manner is as described in Embodiment 1, and is not described here. Further, a selection unit of the selection matrix W and a selection unit of the selection matrix D may be separately provided.
  • the transmitter further includes a first transmitting unit 604 for transmitting a demodulation reference signal (DM-RS) to the processing unit 602;
  • the processing unit 602 transmits to the receiver through the phase rotation matrix D, or the precoding matrix ⁇ , or sequentially through the phase rotation matrix D and the precoding matrix W.
  • DM-RS demodulation reference signal
  • Fig. 7 is a view showing the configuration of a transmitter of a fifth embodiment of the present invention.
  • the transmitter includes: a selection unit 701, a processing unit 702, an antenna unit 703, and a sending unit 704, which have the same functions as those in Embodiment 4, and are not described herein again.
  • the transmitter further includes:
  • the first receiving unit 706 is configured to receive, by the receiver, the channel quality indicator C2/ of the original SU-MIM0 transmission and the change amount of the channel quality indicator ⁇ 3 ⁇ 4/;
  • the calculating unit 707 is configured to calculate, according to the amount of change received by the first receiving unit 706 and the channel quality indicator of the original SU-MIM0 transmission, a channel quality indicator C2/ of the current open-loop CoMP transmission,
  • the pre-processing unit 708 is configured to process the SFBC data stream according to the current channel quality indicator C2/', and send the processed SFBC data stream to the processing unit 702, where the processing of the pre-processing unit 708 is implemented. Examples 1 and 3 are not described here.
  • the transmitter may further include a storage unit (not shown), and the alternative precoding matrix W and matrix D may also be pre-stored in the storage unit for use by the selection unit 701.
  • the transmitter can further include a second receiving unit (not shown) for receiving a phase rotation matrix and/or a precoding matrix fed back by the receiver for use by the transmitter in transmitting the data stream.
  • a second receiving unit (not shown) for receiving a phase rotation matrix and/or a precoding matrix fed back by the receiver for use by the transmitter in transmitting the data stream.
  • the transmitter may refer to a base station, such as an eNodeB, RHH, or the like.
  • FIG. 8 is a block diagram showing the configuration of a receiver in Embodiment 6 of the present invention.
  • the receiver includes: a second receiving unit 801, a channel estimating unit 802, and a demodulating unit 803.
  • the third receiving unit 801 is configured to receive, by using the antenna 800, more than one data stream sent by the transmitter. .
  • the channel estimation unit 802 performs channel estimation by using a demodulation reference signal (DM-RS) to obtain an equivalent channel.
  • DM-RS demodulation reference signal
  • the method for channel estimation by the channel estimation unit 802 is as described in Embodiments 2 and 3. Narration.
  • the demodulation unit 803 demodulates and recovers the received SFBC data stream and the SFBC data stream by using the obtained equivalent channel.
  • the method for demodulating the SFBC data symbols by the demodulation unit 803 is as described in Embodiments 2 and 3, and details are not described herein again.
  • the receiver may further include a storage unit 804 that may store information of an equivalent channel obtained by the channel estimation unit 802.
  • the receiver may further include a sending unit (not shown) for transmitting the channel quality indicator CQ/ of the original single user MIM0 and the amount of change ⁇ 3 ⁇ 4 of the channel quality indicator to the transmitter; Alternatively, the selected matrix D and/or precoding matrix W is transmitted to the transmitter, which matrix D and/or precoding matrix W are as described in embodiments 2, 3.
  • the receiver may further include an information acquiring unit (not shown), and the user obtains the amount of change of the channel quality indicator, and the manner of obtaining is as described in Embodiment 2, and details are not described herein again.
  • the receiver may be a variety of terminal devices, such as a mobile phone, or any device having communication capabilities, such as a gaming machine, a PDA, a portable computer, or the like.
  • One or more of the functional blocks described with respect to Figures 5, 6 and 7 and/or one or more combinations of functional blocks may be implemented as General purpose processor, digital signal processor (DSP), application specific integrated circuit (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete to perform the functions described herein Hardware component or any suitable combination thereof.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • One or more of the functional blocks described with respect to Figures 5 and 6 and/or one or more combinations of functional blocks may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, multiple A microprocessor, one or more microprocessors in communication with the DSP, or any other such configuration.
  • Figure 9 is a block diagram showing the structure of a data transmission system in accordance with a seventh embodiment of the present invention.
  • the system includes one or more transmitters 901 ( 1 ) to 901 ( n ) , and a receiver 902 ;
  • each transmitter and receiver is shown in Fig. 5, Fig. 6, and Fig. 7, and will not be described here.
  • the implementation process of the transmitter and the receiver in the system is as described in Embodiment 3 shown in FIG. 4, and details are not described herein again.
  • the selection unit of the plurality of transmitters 901(1) to 901(n) may select the precoding matrix W and/or the matrix D in the manner described in Embodiments 1 and 3.
  • the selecting units of the plurality of transmitters 901(1) to 901(n) cyclically select the precoding matrix W in a predetermined order, and the precoding used by each transmitter per cycle
  • the matrix may be the same, wherein the order of the precoding matrix used by each transmitter selection is determined in a cyclic shift manner, as described in Embodiment 1, and details are not described herein again.
  • phase rotation matrices selected by the selection units of the plurality of transmitters may not be the same.
  • the transmitter can transmit the SFBC data symbols to the receiver through the matrix D, and/or the matrix W, and select the precoding matrix W and/or the matrix D with the resource block RB as the granularity.
  • the receiver can receive the data stream and DM-RS transmitted by multiple transmitters, perform channel estimation according to the received DM-RS, obtain an equivalent channel, and use the equivalent channel pair to receive The data symbols are demodulated and recovered, and do not need to be connected.
  • the PMI feedback is applied to the receiver. It is also applicable to scenarios that do not support user feedback or PMI feedback is inaccurate.
  • CoMP transmission based on transmit diversity is implemented.
  • the embodiment of the present invention also provides a computer readable program, wherein when the program is executed in a transmitter, the program causes the computer to execute the data transmission method described in Embodiments 1 and 3 in the transmitter.
  • a storage medium storing a computer readable program, wherein the computer readable program causes a computer to execute the data transmission method of Embodiments 1 and 3 in a transmitter.
  • Another aspect of the present invention provides a computer readable program, wherein when the program is executed in a receiver, the program causes the computer to execute the data transmission method described in the above embodiments 2, 3 in the receiver .
  • a storage medium storing a computer readable program, wherein the computer readable program causes a computer to execute the data transmission method described in Embodiments 2, 3 above in a receiver.
  • the above system can also support cell reference signal (CRS) demodulation, and the transmitter can transmit the CRS to the receiver, and the receiver can demodulate according to the CRS.
  • CRS cell reference signal
  • the above apparatus and method of the present invention may be implemented by hardware or by hardware in combination with software.
  • the present invention relates to a computer readable program that, when executed by a logic component, enables the logic component to implement the apparatus or components described above, or to cause the logic component to implement the various methods described above Or steps.
  • Logic components such as field programmable logic components, microprocessors, processors used in computers, and the like.
  • the present invention also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, or the like.

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Abstract

L'invention porte sur un procédé et un système de transmission de données, et sur un émetteur et un récepteur. Le procédé comprend les opérations suivantes : un émetteur sélectionne une matrice de rotation de phase et/ou une matrice de pré-codage, l'émetteur sélectionnant la matrice de rotation de phase et/ou la matrice de pré-codage en prenant comme granularité un bloc de ressources; l'émetteur mappe au moins un groupe de flux de données de code - fréquence en bloc (SFBC) à un port d'antenne de celui-ci par l'intermédiaire de la matrice de rotation de phase sélectionnée, ou par l'intermédiaire de la matrice de pré-codage, ou par l'intermédiaire de la matrice de rotation de phase et de la matrice de pré-codage successivement; et l'envoi à un récepteur par l'intermédiaire d'une antenne correspondant au port d'antenne. Au moyen des modes de réalisation de la présente invention, un émetteur peut envoyer des flux de données SFBC à un récepteur par l'intermédiaire d'une matrice D et/ou d'une matrice de pré-codage W, et sélectionne la matrice D et la matrice de pré-codage W en prenant comme granularité un bloc de ressources (RB) de manière à permettre la démodulation d'un signal de référence de démodulation (DM-RS) sans qu'il ne soit nécessaire de renvoyer un indice de matrice de pré-codage (PMI) au récepteur, et cela est également applicable à des scénarios qui ne prennent pas en charge une rétroaction d'utilisateur ou de rétroaction PMI imprécise.
PCT/CN2011/079820 2011-09-19 2011-09-19 Procédé et système de transmission de données, et émetteur et récepteur Ceased WO2013040741A1 (fr)

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