[go: up one dir, main page]

WO2009026741A1 - Procédé et dispositif pour un précodage distribué - Google Patents

Procédé et dispositif pour un précodage distribué Download PDF

Info

Publication number
WO2009026741A1
WO2009026741A1 PCT/CN2007/002594 CN2007002594W WO2009026741A1 WO 2009026741 A1 WO2009026741 A1 WO 2009026741A1 CN 2007002594 W CN2007002594 W CN 2007002594W WO 2009026741 A1 WO2009026741 A1 WO 2009026741A1
Authority
WO
WIPO (PCT)
Prior art keywords
precoding
relay
station
coded
relay station
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2007/002594
Other languages
English (en)
Chinese (zh)
Inventor
Wei Ni
Jimin Liu
Jiming Chen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Shanghai Bell Co Ltd
Alcatel Lucent SAS
Original Assignee
Alcatel Lucent Shanghai Bell Co Ltd
Alcatel Lucent SAS
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.)
Filing date
Publication date
Application filed by Alcatel Lucent Shanghai Bell Co Ltd, Alcatel Lucent SAS filed Critical Alcatel Lucent Shanghai Bell Co Ltd
Priority to PCT/CN2007/002594 priority Critical patent/WO2009026741A1/fr
Priority to CN200780100327.4A priority patent/CN101785211B/zh
Publication of WO2009026741A1 publication Critical patent/WO2009026741A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission

Definitions

  • the present invention relates to a wireless communication relay network, and more particularly to a method and apparatus for relay precoding of distributed coded signals in a relay station, a base station, and a mobile station of a wireless communication relay network.
  • STBC Distributed Space Time Block Code
  • existing distributed space-time block code scheme is not mature enough, and the antenna selection is still not optimized enough, and the performance is not optimal. Even with the simplest antenna selection, existing distributed space-time block code schemes cannot automatically switch from distributed space-time block codes to local space-time block codes, or automatically switch from local space-time block codes to distributed Space time block code.
  • distributed space-time block codes may be optimal. However, due to the imbalance of path loss and received power due to the difference in channel transmission coefficients, in some cases, the distributed space-time block code does not provide better performance than the local space-time block code. Therefore, Joint relay, fixed use of distributed space-time block code is unreasonable.
  • a space-time block code based on an Alamouti code uses a dual-band transmit antenna, and each transmit antenna is located in one relay station, which means that at most two relay stations participate. Joint relaying to obtain spatial diversity gain, but in fact, in order to obtain higher diversity gain, it is hoped that more relay stations can participate in joint relay.
  • the network device obtains channel corresponding information between the plurality of source devices to the target device by the joint relay, based on the corresponding information of the channel and based on the signal to noise ratio maximization criterion of the received signal of the target device, and before and after the precoding operation in the plurality of source devices And a criterion for maintaining a total transmit power of each of the coded symbols in the coded signal, determining a precoding coefficient of each of the coded symbols in the plurality of transmit antennas, and notifying the corresponding source device of the corresponding precoding coefficients.
  • the source device performs a weighting process based on the transmit antenna on the corresponding coded symbols in the encoded signal by using the precoding coefficients to generate a weighted coded signal to be transmitted, and respectively transmits the signals through multiple transmit antennas.
  • the coded signal here includes a space time coded signal or a space frequency coded signal.
  • a method for controlling distributed precoding of coded signals to be jointly relayed to a target device by a plurality of source devices in a network device of a wireless relay network wherein Each of the source devices includes one or more transmit antennas, and the target device includes one or more receive antennas, wherein the method includes the following steps: a. acquiring multiple roots of the multiple source devices Transmitting antenna to channel corresponding information of a plurality of channels between one or more receiving antennas of said target device; b. determining said encoded signal for a corresponding source device based on said channel corresponding information and based on a predetermined rule a precoding coefficient on each of the one or more transmit antennas of each of the coded symbols; c. providing a precoding coefficient for each of the coded symbols on the one or more transmit antennas for the respective source device And for performing distributed precoding on the encoded signal.
  • a method for precoding a coded signal to be jointly relayed to a target device with another one or more source devices in a source device of a wireless relay network includes the following steps: i. acquiring precoding coefficients of each of the encoded symbols on one or more transmit antennas of the source device; ii. using the precoding coefficient pairs
  • the coded symbols are subjected to transmit antenna based precoding processing to generate precoded coded signals to be transmitted, which are respectively transmitted via one or more transmit antennas.
  • a pre-coded control code apparatus for controlling distributed precoding of coded signals to be jointly relayed to a target device by a plurality of source devices in a network device of a wireless relay network.
  • Each of the source devices includes one or more transmit antennas, and the target device includes one or more receive antennas, where
  • the precoding control device includes a first obtaining device, a determining device, and a providing device.
  • the first obtaining device is configured to acquire channel corresponding information of multiple channels between multiple transmit antennas of the multiple source devices to one or more transmit antennas of the target device; Determining channel corresponding information, and determining, according to a predetermined rule, a precoding coefficient of each coded symbol on the one or more transmit antennas of the coded signal for the corresponding source device; providing means for the corresponding source device Precoding coefficients for each of the encoded symbols on one or more of the transmit antennas are provided for distributed precoding of the encoded signals.
  • a precoding apparatus for precoding a coded signal to be jointly relayed to a target device with another one or more source devices in a source device of a wireless relay network
  • the precoding apparatus comprises a second obtaining means and a precoding processing means.
  • the second obtaining means is configured to acquire precoding coefficients of each of the encoded symbols on one or more transmitting antennas of the source device;
  • the precoding processing device is configured to use the precoding coefficient to correspond to the corresponding
  • the coded symbols are subjected to transmit antenna based precoding processing to generate precoded coded signals to be transmitted, which are respectively transmitted via one or more transmit antennas.
  • the invention adopts distributed precoding on the basis of the distributed coded signal, fully utilizes spatial diversity, and dynamically adjusts the precoding coefficient according to the dynamic transmission characteristic of the channel, so that the signal to noise ratio of the received signal is maximized. Improve the efficiency of data transmission in multi-hop relay networks.
  • FIG. 1 is a schematic diagram of downlink data transmission of a wireless relay network according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of data transmission of a downlink between two relay stations and a mobile station in FIG. 1;
  • 3 is a schematic diagram of uplink data transmission of a wireless relay network according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram showing the topology of a multi-hop wireless relay network according to an embodiment of the present invention.
  • FIG. 5 is a flowchart of distributed precoding for controlling a coded signal to be jointly relayed to a target device by a plurality of source devices in a network device of a wireless relay network according to an embodiment of the present invention
  • FIG. 6 is a flow chart for precoding a coded signal to be jointly relayed to a target device with another one or more source devices in a source device of a wireless relay network according to an embodiment of the present invention
  • FIG. 7 is a structure of a precoding control apparatus 10 for controlling distributed precoding of coded signals to be jointly relayed to a target device by a plurality of source devices in a network device of a wireless relay network according to an embodiment of the present invention.
  • FIG. 8 is a diagram of a precoding apparatus 20 for precoding a coded signal to be jointly relayed to a target device with another one or more source devices in a source device of a wireless relay network, in accordance with an embodiment of the present invention. Structure diagram. detailed description
  • Figure 1 shows a schematic diagram of downlink data transmission of a wireless relay network in accordance with an embodiment of the present invention.
  • Figure 1 includes a base station 1, a relay station 2, a relay station 2, and a mobile station 3.
  • the distributed precoding process in the joint relay of the present invention will be described in detail below by taking the downlink data transmission shown in Fig. 1 as an example.
  • the base station 1 transmits a signal transmitted to the mobile station 3 to the relay station 2 and the relay station 2, and after receiving the signal transmitted from the base station to the mobile station 3, the base station 1 performs space-time coding on the signal to obtain each The space-time code to be transmitted is grouped; then, the transmission of each symbol on each of the transmitting antennas is controlled according to a precoding coefficient obtained in advance, that is, a precoding coefficient of each symbol in each of the transmitting antennas in the space-time block code.
  • the relay station 2 and the relay station 2 each have two transmitting antennas
  • the mobile station 3 has one receiving antenna
  • the space time block code uses an Alamouti code as an example. Referring to FIG. 2, each group of Alamouti The process of determining the precoding coefficients of each symbol in the code on each of the transmitting antennas is described in detail.
  • the relay station 2 and the relay station 2 after receiving the signal ⁇ and the signal transmitted by the base station, perform Alamouti encoding on the following form:
  • X 2 is processed in the first At a time, the second line symbol -x ; is precoded by W 21 and W 22 , and then transmitted on each of the transmitting antennas at the second moment.
  • the signal transmitted by the receiving station of the mobile station 3 by the relay station 2 and the relay station 2 at the first moment can be written as follows:
  • the signal transmitted by the receiving station of the mobile station 3 by the relay station 2 and the relay station 2 at the second moment can be written as follows:
  • ! ⁇ , h 2 , h 3 and h 4 are the channel transmission coefficients of the four channels of the four transmitting antennas of the relay station 2 and the relay station 2 to one receiving antenna of the mobile station 2, respectively, and the noise received by n1 and n2 respectively.
  • Equation (5) is the expression of the signal received by the mobile station 3 when the joint relay uses the antenna A1 in the relay station 2 and the antenna A3 in the relay station 2 to transmit the distributed space-time code when the pre-coding is not performed:
  • Equation (6) is obtained according to the formula (5) and the constraint that the transmission power of each symbol before and after precoding is constant.
  • the formula (6) an optimal precoding coefficient design scheme can be obtained, and the formula (7) gives a formula for solving the precoding coefficient when the signal to noise ratio of the received signal in the mobile station 3 is the largest. Since the noise is assumed to be additive white Gaussian noise, the noise power is constant.
  • the optimal joint time-based block code based on space-time block code can be solved, including local space-time block code and distributed space-time grouping. code.
  • W, w _o , according to formula ( 2 ) and formula ( 3 ), 1 ⁇ 0 0 0 1 and 2 - L.
  • Q i indicates a distributed space time block code
  • Indicated is a local space time block code. List all possible distributed and local spacetimes a precoding coefficient vector corresponding to the block code, and constituting a set (8) according to the following method for maximizing the signal to noise ratio of the signal received by the receiver, combined with the channel transmission coefficient, a distributed precoding method for the joint relay The selection is made, that is, the optimal precoding coefficient vector is selected from the Q w in the set.
  • wei2 w ( 8 ) If the amplitude value of the channel transmission coefficient is only known when determining the precoding coefficient, the phase of the visible channel transmission coefficient is zero, and can also be distributed in space-time coding and local according to formula (8). The optimal selection is made in space-time coding, that is, the optimal precoding coefficient vector is selected from the Q w in the set.
  • the distributed space time block code can be regarded as a special case of the present invention, and it is obvious that it is not necessarily optimal. Therefore, after distributed precoding (or called joint precoding), joint relay can achieve higher performance.
  • the above is a detailed description of the precoding coefficient determining process of the present invention in which the relay station 2 and the relay station 2 respectively have two transmitting antennas and the mobile station 3 has one receiving antenna as an example.
  • the mobile station 3 has multiple receiving antennas
  • combining multiple signals received by the plurality of receiving antennas (for example, maximum ratio combining) into one receiving signal can be equivalent to one receiving antenna, and also according to the same.
  • the precoding coefficient process described above determines the precoding coefficients of the respective symbols in the space time block code on the respective transmission lines.
  • the precoding coefficients of the respective symbols in the space time block code on the respective transmission lines are also determined according to the above-described precoding coefficient process.
  • the present invention has been described above by taking the downlink data transmission of the two-hop wireless relay network shown in Fig. 1, that is, the relay station 2 and the relay station 2, jointly relaying data to the mobile station 3 as an example. It should be understood by those skilled in the art that the present invention is not limited thereto.
  • the base station 1 can also participate in the joint relay. That is, the base station 1 can jointly relay data to the mobile station 3 together with the relay station 2 or the relay station 2.
  • the determination of the precoding coefficient may take a centralized determination manner or a distributed determination manner.
  • the manner of centralized determination means that: the precoding coefficient is determined by the base station 1 (or the relay station 2 or the relay station 2, or other network equipment), and then the base station 1 (the relay station 2 or the relay station 2, or other network equipment) Relay station 2 and relay station 2. The corresponding precoding coefficients are respectively notified to the relay station 2 and the relay station 2, respectively.
  • the manner of distributed determination means that both the relay station 2 and the relay station 2 acquire the channel transmission coefficients between the relay station 2 and the relay station 2 and the mobile station 3 (obtained from the base station 1, or acquired from the mobile station 3, or the relay station 2) And the relay station 2, mutually notifying each other of the channel transmission coefficient between it and the mobile station 3), and then calculating the precoding coefficients, respectively.
  • the base station 1 usually determines the precoding coefficient and notifies the relay station 2 and the relay station 2 in consideration of the simplicity and cost of the relay station. In view of the instability of the radio channel, the base station 1 can determine the precoding coefficients periodically or non-periodically, and inform the relay station 2 and the relay station 2 so that the signals received by the mobile station 3 are always optimal.
  • the precoding coefficient may be determined by the base station 1 according to the channel transmission coefficient between the relay station 2 and the relay station 2, and the mobile station 3, or the precoding coefficient may be determined by a dedicated network device; of course, the relay station 2 or the relay station may also be used. 2, to determine. In actual use, the precoding coefficient is usually determined by the base station 1 in consideration of the simplicity and cost of the relay station.
  • the downlink channel transmission coefficient between the relay station 2 and the relay station 2 and the mobile station 3 can be measured by the mobile station 3, and fed back to the base station 1 via the relay station 2 and the relay station 2.
  • the channel transmission coefficients of the uplink channel and the downlink channel are approximately the same, and the uplink channel transmission coefficients between the uplink channel and the mobile station 3 can also be measured by the relay station 2 and the relay station 2, and fed back to the base station 1.
  • the relay station 2 and the relay station 2 jointly relay data to the base station 1.
  • the mobile station 3 can also participate in joint relay, as shown in FIG. Show.
  • the determination of the precoding coefficient can be determined in a centralized manner, or a distributed determination manner can be adopted.
  • the precoding coefficient may be determined by the base station 1 according to the channel transmission coefficient between the relay station 2 and the relay station 2, and the base station 1, or the precoding coefficient may be determined by a dedicated network device; of course, the relay station 2 and the relay station 2 may also be used.
  • the precoding coefficient can also be determined by the mobile station 3 if the mobile station 3 participates in the joint relay.
  • the precoding coefficients are usually determined by the base station 1 in consideration of the simplicity and cost of the relay station and the mobile station. Considering the instability of the radio channel, the base station 1 can determine the precoding coefficients periodically or non-periodically, and notifies the relay station 2 and the relay station 2, so that The signal received by base station 1 is always optimal.
  • the uplink channel transmission coefficients between the relay station 2 and the relay station 2 and the base station 1 can be measured by the base station 1.
  • the channel transmission coefficients of the uplink channel and the downlink channel are approximately the same, and the downlink channel transmission coefficients between the uplink channel and the base station 1 can also be measured by the relay station 2 and the relay station 2, and fed back to the base station 1.
  • the present invention is not limited to the two-hop wireless relay network shown in FIG. 1 and FIG. 3, and is applicable to a three-hop or more-hop wireless relay network, for example, as shown in FIG. Jump wireless relay network.
  • the present invention has been described above by taking a space time block code as an example, those skilled in the art should understand that the present invention is equally applicable to other space time coded signals according to the teachings of the present application;
  • the present invention is also applicable to a space-frequency coded signal, and the different frequencies of the space-frequency coded signal can be understood as corresponding to different times of space-time coding.
  • Figure 5 illustrates a flow diagram for distributed precoding of coded signals to be jointly relayed to a target device by a plurality of source devices in a network device of a wireless relay network in accordance with an embodiment of the present invention.
  • the relay station 2 and the relay station 2 jointly relay the signals to the mobile station 3, that is, the relay station 2 and the relay station 2, which are source devices, and the mobile station 3 is the target device.
  • the relay station 2 and the relay station 2 respectively have two transmitting antennas, and the mobile station 3 has one receiving antenna;
  • the base station 1 is a network device, that is, the base station 1 is responsible for determining the precoding coefficient, that is, each coded symbol in the encoded signal is in each transmitting antenna.
  • the coded signal includes a space time coded signal or a space frequency coded signal.
  • the base station 1 controls the relay station 2 and the relay station 2, and the process of performing distributed precoding on the coded signals to be jointly relayed to the mobile station 3 will be described in detail.
  • the base station 1 acquires channel corresponding information of four channels between one of the four transmit antennas of the relay station 2 and the relay station 2 to the mobile station 3.
  • the corresponding information of the channel is a channel transmission coefficient
  • the channel corresponding information of the four channels is four channel transmission coefficients. hh 2 , h 3 and h4. If the mobile station 3 has M (M is a positive integer) root receiving antenna, then four transmitting antennas of the relay station 2 and the relay station 2 to the mobile station There are 4 XM channel transmission coefficients between the M receiving antennas of 3.
  • the base station 1 acquires channel coefficients between four receiving antennas of the relay station 2 and the relay station 2 to a receiving antenna between the mobile station 3: one is that after the mobile station 3 performs channel estimation, Transmitted to the base station 1; one is that after the mobile station 3 performs channel estimation, the channel transmission coefficient between the channel and the relay station 2 is transmitted to the relay station 2, and the channel transmission coefficient between the channel and the relay station 2 is transmitted to the relay station 2,
  • the channel transmission coefficients are transmitted to the base station 1 by the relay station 2 and the relay station 2'.
  • the uplink and downlink channel symmetry may also be estimated by the relay station 2 and the relay station 2, respectively, and the channel transmission coefficient with the mobile station 3, and transmitted to the base station 1.
  • the base station 1 determines precoding coefficients of each of the coded symbols on the four transmit antennas based on the acquired channel corresponding information and a predetermined rule.
  • the predetermined rule includes: the precoding coefficient is determined such that the signal to noise ratio of the signal received by the mobile station 3 is the largest and the relay station 2 and the relay station 2 maintain the total transmission power of each coded symbol in the coded signal before and after the medium precoding operation constant.
  • the base station 1 can determine the precoding coefficient of each symbol in each group of Alamouti codes on the four transmitting antennas according to the formula (7). .
  • the base station 1 transmits the precoding coefficients of the respective code symbols on the transmit antennas A1 and A2 in the coded signal to the relay station 2, and the precoding coefficients of the respective code symbols in the coded signals on the transmit antennas A3 and A4. It is sent to the relay station 2, for the relay station 2 and the relay station 2, to perform distributed precoding on the encoded signal.
  • the process of determining the precoding coefficient of the present invention is described by taking the channel transmission coefficient as an example. Actually, it may also be based only on the amplitude value of the channel transmission coefficient (in this case, the phase of the visible channel transmission coefficient is zero. ) to determine the precoding coefficient.
  • the determination of the precoding coefficients in the foregoing embodiment adopts a centralized determination manner, and the base station 1 collectively determines the precoding of each coded symbol in the encoded signal on the transmitting antennas of the relay station 2 and the relay station 2.
  • the coefficients, of course, the precoding coefficients can also be determined centrally by the relay station 2 or the relay station 2, or the mobile station 3.
  • the determination of the precoding coefficient may also take a distributed determination manner, for example, The relay station 2 and the relay station 2 respectively acquire channel corresponding information between their four antennas A1, A2, A3 and A4 to the mobile station 3, and then the relay station 2 determines each coded symbol in the encoded signal in its antenna Al according to the channel corresponding information.
  • the precoding coefficient on A2, the relay station 2 determines the precoding coefficient of each coded symbol in the coded signal on its antennas A3, A4 according to the channel corresponding information.
  • the base station 1 can also participate in the joint relay, that is, the base station 1 can jointly relay the signal to the mobile station 3 together with the relay station 2 or the relay station 2; or the base station 1 and the relay station 2 and the relay station 2 jointly relay the signal to the mobile station 3, At this time, the process of determining the distributed precoding coefficient is the same as above, and a centralized determination manner or a distributed determination manner may be adopted.
  • FIG. 6 shows a flow diagram for precoding a coded signal to be jointly relayed to a target device with another one or more source devices in a source device of a wireless relay network, in accordance with an embodiment of the present invention.
  • the relay station 2 and the relay station 2 jointly relay the signals to the mobile station 3, that is, the relay station 2 and the relay station 2, which are source devices, and the mobile station 3 is the target device.
  • the relay station 2 and the relay station 2 respectively have two transmitting antennas, and the mobile station 3 has one receiving antenna;
  • the base station 1 is a network device, that is, the base station 1 is responsible for determining the precoding coefficient, that is, each coded symbol in the encoded signal is in each transmitting antenna. Precoding coefficient on.
  • the coded signal includes a space time coded signal or a space frequency coded signal.
  • step S21 the relay station 2 acquires precoding coefficients on the two transmitting antennas of the relay station 2 of each of the coded signals to be jointly relayed to the mobile station 3 with the relay station 2.
  • the relay station 2 acquires precoding coefficients.
  • the first way is to get it from other network devices. For example, if the precoding coefficient is determined by the base station 1 or the relay station 2, or the mobile station 3, the relay station 2 obtains the above precoding coefficients from the base station 1 or the relay station 2, or the mobile station 3.
  • the second way is that the relay station 2 itself determines the above precoding coefficients. Specifically, the relay station 2 acquires one of the four transmitting antennas of the relay station 2 and the relay station 2 to the mobile station 3. The channel corresponding information of the four channels between the antennas is received, and the precoding coefficients are determined according to the corresponding information of the channel and a predetermined rule.
  • the relay station 2 acquires channel corresponding information between the four transmitting antennas of the relay station 2 and the relay station 2 to one receiving antenna of the mobile station 3.
  • the first method is that the mobile station 3 performs channel estimation to obtain channel corresponding information between the relay station 2 and the relay station 2, and then transmits the information to the relay station 2.
  • the second way is: after the mobile station 3 performs channel estimation, the channel information between the mobile station 3 and the relay station 2 is transmitted to the relay station 2, and the channel information between the mobile station 3 and the relay station 2 is transmitted to the relay station 2, and then the relay station 2 And the relay station 2 transmits the channel corresponding information to the base station 1.
  • the base station 1 transmits the channel corresponding information between the relay station 2 and the mobile station 3 to the relay station 2, and transmits the channel corresponding information between the relay station 2 and the mobile station 3 to the relay station 2.
  • the uplink and downlink channels are symmetric, and the relay station 2 and the relay station 2 can also estimate the channel corresponding information between them and the mobile station 3, respectively, and transmit them to the base station 1. Then, the base station 1 transmits the channel corresponding information between the relay station 2 and the mobile station 3 to the relay station 2, and transmits the channel corresponding information between the relay station 2 and the mobile station 3 to the relay station.
  • the relay station 2 also determines the precoding coefficients of the respective code symbols in the coded signals on the two transmitting antennas of the relay station 2, and supplies them to the relay station 2.
  • step S22 the relay station 2 performs a pre-coding process based on the transmit antenna on the corresponding coded symbols in the coded signal by using the pre-coding coefficients to generate a pre-coded coded signal to be transmitted, which is respectively performed via two transmit antennas. send.
  • the signals to be transmitted on the antennas A1 and ⁇ 2 of the relay station 2 are: 1 1
  • the signals to be transmitted on antennas A3 and ⁇ 4 of relay station 2 are:
  • the relay station 2 and the relay station 2 together with the relay signal to the mobile station 3, are common knowledge that those skilled in the art should know, and the present invention will not be repeated here.
  • the relay station 2 also acquires channel corresponding information of two channels between its two transmitting antennas to one receiving antenna of the mobile station 3, and transmits the channel corresponding information to the base station 1.
  • the channel corresponding information includes a channel transmission coefficient or an amplitude value of a channel transmission coefficient.
  • the manner in which the relay station 2 acquires the channel corresponding information is as follows:
  • the relay station 2 receives the channel corresponding information estimated by the mobile station 3 transmitted by the mobile station 3, and transmits it to the base station 1.
  • the relay station 2 can also estimate the channel corresponding information of the mobile station 3 to its two transmitting antennas, and send it to the base station 1.
  • FIG. 1 shows a schematic diagram of a network topology in which the source device is two or three relay stations and the target device is a relay station.
  • the precoding control device 10 includes a first obtaining device 11, a determining device 12, and a providing device 13.
  • the first obtaining device 11 further comprises a first receiving device 111.
  • a first receiving means 111 is optional device.
  • the relay station 2 and the relay station 2 jointly relay signals to the mobile station 3 , that is, the relay station 2 and the relay station 2, which are source devices, and the mobile station 3 is a target device.
  • the relay station 2 and the relay station 2 respectively have two transmitting antennas, and the mobile station 3 has one receiving antenna;
  • the base station 1 is a network device, that is, the base station 1 is responsible for determining the precoding coefficient, that is, each coded symbol in the encoded signal is transmitted every time.
  • the coded signal here includes a space time coded signal Or a space frequency coded signal.
  • the first acquisition means 11 acquires channel corresponding information of four channels between one of the four transmitting antennas of the relay station 2 and the relay station 2 to the one of the receiving stations.
  • the channel corresponding information is a channel transmission coefficient
  • the channel corresponding information of the four channels is four channel transmission coefficients, h 2 , h 3 , and h 4 . If the mobile station 3 has M (M is a positive integer) root receiving antenna, there are 4 XM channel transmission coefficients between the four transmitting antennas of the relay station 2 and the relay station 2, and the M receiving antennas of the mobile station 3.
  • the first obtaining means 11 acquires channel coefficients between the four transmitting antennas of the relay station 2 and the relay station 2 to a receiving antenna between the mobile station 3 in a plurality of ways: One is that the mobile station 3 performs channel After estimation, it is sent to the first acquisition device 11; one is the channel transmission coefficient between the channel transmission coefficient between the mobile station 3 and the relay station 2, and the channel transmission coefficient between the mobile station 3 and the relay station 2, and the relay station 2 It is transmitted to the relay station 2, and the relay station 2 and the relay station 2 transmit the channel transmission coefficients to the first acquisition means 11.
  • the uplink and downlink channels are symmetric, and the channel transmission coefficients between the mobile station 3 and the relay station 2 can be estimated by the relay station 2 and the relay station 2, respectively, and sent to the first acquisition device 11.
  • the determining means 12 determines the precoding coefficients of each of the encoded symbols on the four transmitting antennas based on the acquired channel corresponding information and a predetermined rule.
  • the predetermined rule includes: the precoding coefficient is determined such that the signal to noise ratio of the signal received by the mobile station 3 is the largest and the relay station 2 and the relay station 2 maintain the total transmission power of each coded symbol in the coded signal before and after the medium precoding operation constant. Taking the relay station 2 and the relay station 2, using the Alamouti code and the corresponding information of the channel as the channel transmission coefficient, the base station 1 can provide each of the code symbols in the device coded signal according to the formula (7): "on the transmitting antennas A1 and A2.
  • the precoding coefficient on the transmitting relay station 2 transmits the precoding coefficients of the respective encoded symbols in the encoded signal on the transmitting antennas A3 and A4 to the relay station 2 for relaying Station 2 and relay station 2 perform distributed precoding on the encoded signal.
  • the process of determining the precoding coefficient of the present invention is described by taking the channel transmission coefficient as an example. Actually, it may also be based only on the amplitude value of the channel transmission coefficient (in this case, the phase of the visible channel transmission coefficient is zero. ) to determine the precoding coefficient.
  • the determination of the precoding coefficients in the foregoing embodiment adopts a centralized determination manner, and the base station 1 collectively determines the precoding of each coded symbol in the encoded signal on the transmitting antennas of the relay station 2 and the relay station 2.
  • the coefficients, of course, the precoding coefficients can also be determined centrally by the relay station 2 or the relay station 2, or the mobile station 3.
  • the determination of the precoding coefficient may also take a distributed determination manner, for example, the relay station 2 and the relay station 2 respectively acquire the channel correspondence between their quadruple antennas A1, A2, A3 and A4 to the mobile station 3. Information, then the relay station 2 determines the precoding coefficients of each of the encoded symbols on its antennas A1, A2 according to the channel corresponding information, and the relay station 2 determines, according to the channel corresponding information, each coded symbol in the encoded signal at its antennas A3, A4 Precoding coefficient on.
  • the base station 1 can also participate in the joint relay, that is, the base station 1 can jointly relay the signal to the mobile station 3 together with the relay station 2 or the relay station 2; or the base station 1 and the relay station 2 and the relay station 2 jointly transmit the relay signal to the mobile station 3, At this time, the process of determining the distributed precoding coefficient is the same as above, and a centralized determination manner or a distributed determination manner may be adopted.
  • the precoding apparatus 20 includes a second obtaining means 21, a precoding processing means 22, a third obtaining means 23, and a second transmitting means 24.
  • the optional sub-devices of many preferred embodiments are shown in FIG. 8, and those skilled in the art will understand from the teachings of the present application that only the second obtaining means 21 and the pre-encoding processing means 22 are understood. It is a device necessary for the implementation of the invention, and other sub-devices are optional devices.
  • the relay station 2 and the relay station 2 jointly relay signals to the mobile station 3, that is, the relay station 2 and the relay station 2, which are source devices, and the mobile station 3 is a target device.
  • the relay station 2 and the relay station 2 respectively have two transmitting antennas, and the mobile station 3 has one receiving antenna; 2007/002594
  • the base station 1 is responsible for determining the precoding coefficient, that is, the precoding coefficient of each coded symbol in the encoded signal on each of the transmitting antennas.
  • the coded signal includes a space time coded signal or a space frequency coded signal.
  • the second obtaining means 21 acquires a precoding coefficient with respect to the two transmitting antennas of the relay station 2 of each of the coded signals to be jointly relayed to the mobile station 3 with the relay station 2.
  • the second obtaining means 21 obtains two types of precoding coefficients in two ways.
  • the first way is that the second obtaining means 21 acquires from other network devices. For example, if the precoding coefficient is determined by the base station 1 or the relay station 2, or the mobile station 3, the relay station 2 acquires the above precoding coefficients from the base station 1 or the relay station 2' or the mobile station 3.
  • the second way is that the second obtaining means 21 itself determines the above-described precoding coefficient. Specifically, the second obtaining means 21 acquires channel corresponding information of four channels between four receiving antennas of the relay station 2 and the relay station 2, and a receiving antenna between the mobile station 3, and according to the channel corresponding information and reservation Rule, determine the above precoding coefficient.
  • the second obtaining means 21 acquires a plurality of ways of channel corresponding information between the four transmitting antennas of the relay station 2 and the relay station 2 to one receiving antenna of the mobile station 3.
  • the first way is that the mobile station 3 performs channel estimation to obtain channel corresponding information between the relay station 2 and the relay station T, and then transmits the information to the second acquisition device 21.
  • the second way is: after the mobile station 3 performs channel estimation, the channel information between the mobile station 3 and the relay station 2 is sent to the second acquiring device 21, and the channel information between the mobile station 3 and the relay station 2 is transmitted to the relay station 2, and the relay station 2.
  • the channel corresponding information between the mobile station 3 and the mobile station 3 is transmitted to the base station 1.
  • the base station 1 transmits the channel corresponding information between the relay station 2 and the mobile station 3 to the second acquisition means 21.
  • the uplink and downlink channels are symmetrical, and the second acquisition means 21 can also estimate the channel corresponding information between the relay station 2 and the mobile station 3.
  • the relay station 2 estimates the channel corresponding information between it and the mobile station 3 and transmits it to the base station 1. Then, the base station 1 will The relay station 2, the channel corresponding information between the mobile station 3 and the mobile station 3 is sent to the second obtaining means 21. If the precoding coefficient is determined in a centralized manner, the second obtaining means 21 further determines that each of the encoded symbols in the encoded signal is at the relay station 2, The precoding coefficients on the two transmit antennas are provided to the relay station 2, .
  • the precoding processing means 22 performs a precoding process based on the transmit antenna on the corresponding coded symbols in the coded signal by using the precoding coefficients to generate a precoded coded signal to be transmitted, which are respectively transmitted via two transmit antennas.
  • the signals to be transmitted on ⁇ 2 are:
  • the signals to be transmitted on antennas A3 and ⁇ 4 of relay station 2 are:
  • relay station 2 and the relay station 2 together with the relay signal to the mobile station 3, are common knowledge that those skilled in the art should know, and the present invention will not be described herein.
  • the third obtaining means 23 also acquires channel corresponding information of two channels between its two transmitting antennas to one receiving antenna of the mobile station 3, and transmits the channel corresponding information to the base station 1 by the second transmitting means 24.
  • the channel corresponding information includes a channel transmission coefficient or an amplitude value of a channel transmission coefficient.
  • the manner in which the third acquisition means 23 acquires the channel corresponding information is as follows:
  • the third acquisition means 23 acquires the channel corresponding information estimated by the mobile station 3 transmitted by the mobile station 3, and transmits it to the base station 1 by the second transmitting means 24.
  • the third obtaining means 24 can also estimate the channel corresponding information of the mobile station 3 to its two transmitting antennas, and transmit it to the base station 1 by the second transmitting means 24.
  • FIG. 4 shows a schematic diagram of a network topology in which the source device is two or three relay stations and the target device is a relay station.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé utilisé pour le précodage d'un signal codé dans un réseau relais sans fil. En premier lieu, le dispositif de réseau obtient les informations correspondantes du canal entre une pluralité de dispositifs sources qui sont combinés pour un relais et un dispositif de destination ; en fonction des informations correspondantes du canal et selon la règle prédéterminée, il détermine le coefficient de précodage de chaque symbole codé des signaux codés pour une pluralité d'antennes de transmission ; et il informe le dispositif source correspondant du coefficient de précodage correspondant. La pluralité de dispositifs sources exécutent un traitement de pondération en fonction de l'antenne de transmission pour le symbole codé correspondant des signaux codés, en utilisant le coefficient de précodage, pour générer les signaux codés pondérés à transmettre, puis ils les transmettent respectivement par le biais de la pluralité d'antennes de transmission. Du fait que le précodage distribué est introduit sur la base des signaux codés distribués, la diversité spatiale est utilisée de manière suffisante, et le coefficient de précodage est ajusté de façon dynamique en fonction de la caractéristique de transmission dynamique du canal, de façon à atteindre un rapport signal sur bruit maximal du signal reçu et à accroître l'efficacité de la transmission des données dans un réseau à relais multi-étapes.
PCT/CN2007/002594 2007-08-29 2007-08-29 Procédé et dispositif pour un précodage distribué Ceased WO2009026741A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CN2007/002594 WO2009026741A1 (fr) 2007-08-29 2007-08-29 Procédé et dispositif pour un précodage distribué
CN200780100327.4A CN101785211B (zh) 2007-08-29 2007-08-29 用于分布式预编码的方法及装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2007/002594 WO2009026741A1 (fr) 2007-08-29 2007-08-29 Procédé et dispositif pour un précodage distribué

Publications (1)

Publication Number Publication Date
WO2009026741A1 true WO2009026741A1 (fr) 2009-03-05

Family

ID=40386642

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2007/002594 Ceased WO2009026741A1 (fr) 2007-08-29 2007-08-29 Procédé et dispositif pour un précodage distribué

Country Status (2)

Country Link
CN (1) CN101785211B (fr)
WO (1) WO2009026741A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102035629A (zh) * 2010-12-30 2011-04-27 浙江大学 基于多天线预编码的双向中继系统的网络编码方法
US8861392B2 (en) 2009-09-28 2014-10-14 Huawei Technologies Co., Ltd. Pre-coding method in cooperative relay system, communication apparatus, and relay apparatus
WO2019214648A1 (fr) * 2018-05-11 2019-11-14 电信科学技术研究院有限公司 Procédé de commande de puissance de liaison montante, terminal et dispositif de réseau

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103828453B (zh) * 2011-12-31 2017-11-10 日电（中国）有限公司 用于在认知无线电系统中波束成形的方法和装置
DE102012024215A1 (de) * 2012-12-11 2014-06-12 Volkswagen Aktiengesellschaft Bedienverfahren und Bedienvorrichtung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1625069A (zh) * 2003-12-05 2005-06-08 株式会社Ntt都科摩 无线电转发器和无线电中继传输方法
CN1734972A (zh) * 2004-07-30 2006-02-15 瑞登有限公司 分布式输入分布式输出无线通信的系统和方法
CN1792045A (zh) * 2003-04-28 2006-06-21 松下电工株式会社 无线电中继器

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1792045A (zh) * 2003-04-28 2006-06-21 松下电工株式会社 无线电中继器
CN1625069A (zh) * 2003-12-05 2005-06-08 株式会社Ntt都科摩 无线电转发器和无线电中继传输方法
CN1734972A (zh) * 2004-07-30 2006-02-15 瑞登有限公司 分布式输入分布式输出无线通信的系统和方法

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8861392B2 (en) 2009-09-28 2014-10-14 Huawei Technologies Co., Ltd. Pre-coding method in cooperative relay system, communication apparatus, and relay apparatus
CN102035629A (zh) * 2010-12-30 2011-04-27 浙江大学 基于多天线预编码的双向中继系统的网络编码方法
WO2019214648A1 (fr) * 2018-05-11 2019-11-14 电信科学技术研究院有限公司 Procédé de commande de puissance de liaison montante, terminal et dispositif de réseau
CN110475330A (zh) * 2018-05-11 2019-11-19 电信科学技术研究院有限公司 一种上行功率控制方法、终端及网络设备
CN110475330B (zh) * 2018-05-11 2021-05-25 电信科学技术研究院有限公司 一种上行功率控制方法、终端及网络设备
US11206618B2 (en) 2018-05-11 2021-12-21 Datang Mobile Communications Equipment Co., Ltd. Uplink power control method, terminal and network device

Also Published As

Publication number Publication date
CN101785211B (zh) 2013-08-07
CN101785211A (zh) 2010-07-21

Similar Documents

Publication Publication Date Title
US20200220705A1 (en) Distributed collaborative signaling in full duplex wireless transceivers
US8081721B2 (en) Method and arrangement in wireless communication networks using relaying
TWI396421B (zh) 在無線分程傳遞網路中之改良排程
US20130029677A1 (en) Multi-site mimo cooperation in cellular networks
US20100091897A1 (en) Wireless communication system, wireless communication device, wireless communication method and computer program
WO2009107314A1 (fr) Système de communication sans fil à sauts multiples
WO2010067419A1 (fr) Système de communication sans fil et procédé de communication sans fil
EP2481233B1 (fr) Coopération mimo multi-site dans des réseaux cellulaires
CN109474317B (zh) Mr预处理下硬件损伤大规模mimo双向中继系统功率分配方法
WO2014063472A1 (fr) Procédés et dispositifs pour la réception et la transmission d'un signal de données combiné
CN103763015A (zh) 一种有直连链路的多天线中继网络中发送天线选择方法
CN103973627A (zh) 一种全速率分布式多天线双向无线协作中继传输方法
US20140369255A1 (en) Two-way relay apparatus and method thereof
TW200913536A (en) A method for communicating in a MIMO context
JP6012858B2 (ja) 複数アンテナ・アレイを使用する無線固定アクセスのシステムおよび方法
WO2009026741A1 (fr) Procédé et dispositif pour un précodage distribué
CN102780670A (zh) 全速率多跳无线协作中继传输方案
CN102035629A (zh) 基于多天线预编码的双向中继系统的网络编码方法
JP2010193445A (ja) ２ホップｍｉｍｏａｆ中継ネットワークにおいてチャネルを推定する方法
KR20100079206A (ko) 무선 통신 시스템의 데이터 송신 방법
CN102769486A (zh) 双向多跳中继系统中的中继端信号处理方法
CN102195700B (zh) 一种针对下行链路小区边缘用户的协作小区调度传输方法
CN101764678B (zh) 基于空间映射的中继方法和装置
CN101785213B (zh) 无线通信网络中多中继站联合中继的方法和装置
CN103532602B (zh) 天线选择方法以及中继节点

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 200780100327.4

Country of ref document: CN

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 07800812

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 07800812

Country of ref document: EP

Kind code of ref document: A1