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WO2009059536A1 - Procédé, dispositif, station de base et équipement d'utilisateur destinés à une insertion de fréquence pilote dans un système mrof - Google Patents

Procédé, dispositif, station de base et équipement d'utilisateur destinés à une insertion de fréquence pilote dans un système mrof Download PDF

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Publication number
WO2009059536A1
WO2009059536A1 PCT/CN2008/072865 CN2008072865W WO2009059536A1 WO 2009059536 A1 WO2009059536 A1 WO 2009059536A1 CN 2008072865 W CN2008072865 W CN 2008072865W WO 2009059536 A1 WO2009059536 A1 WO 2009059536A1
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WIPO (PCT)
Prior art keywords
unit block
block
dedicated pilot
unit
symbol
Prior art date
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Ceased
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PCT/CN2008/072865
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English (en)
Chinese (zh)
Inventor
Shaohui Sun
Yingmin Wang
Hai Tang
Yuemin Cai
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Datang Mobile Communications Equipment Co Ltd
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Datang Mobile Communications Equipment Co Ltd
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Application filed by Datang Mobile Communications Equipment Co Ltd filed Critical Datang Mobile Communications Equipment Co Ltd
Publication of WO2009059536A1 publication Critical patent/WO2009059536A1/fr
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver

Definitions

  • Pilot insertion method, device, base station and user equipment for orthogonal frequency division multiplexing system The application is filed on October 30, 2007, the Chinese Patent Office, the application number is 200710164389.3, and the invention name is "Orthogonal Frequency Division Multiplexing System" The priority of the Chinese Patent Application, the entire disclosure of which is incorporated herein by reference.
  • the present invention relates to a broadband orthogonal frequency division multiplexing wireless mobile communication technology, and in particular, to a pilot insertion method and apparatus for an orthogonal frequency division multiplexing system, and a corresponding base station and a user equipment (UE).
  • Background technique
  • the basic technology when using Orthogonal Frequency Division Multiplexing (OFDM) technology as the system air interface is basically determined.
  • OFDM Orthogonal Frequency Division Multiplexing
  • multiple orthogonal subcarriers can be used in one OFDM symbol to implement multi-user multiplexing and multiple access.
  • each subcarrier in the same cell allocated is orthogonal, and there is no intra-cell multiple access interference.
  • users between adjacent cells, especially those at the cell edge, if they transmit/receive signals at the same time-frequency resource location, interference will occur between the cells, so that the cell The quality of communication at the edge of the user deteriorates drastically.
  • the block repeat multiple access scheme is a new and efficient multiple access scheme.
  • Information transmission based on Block Repeat (BR) can be called block repetition transmission.
  • Block repetition based multiplexing can be referred to as Block Repeat Division Multiplex (BRDM).
  • Block-based multiple access can be referred to as Block Repeat Division Multiple Access (BRDMA).
  • the combination of block repetition multiple access scheme and OFDM may be referred to as block repetition orthogonal frequency division multiplexing (BR-OFDM) or block repetition orthogonal frequency division multiple access (BR-OFDMA).
  • a data unit block is modulated and mapped to generate a basic unit block.
  • BU Block Unit
  • BU Block Unit
  • RF repetition factor
  • RC repetition code
  • ⁇ use different RC sequences for weighting.
  • the blocks are separated. In this way, interference between neighboring cell users in the same frequency networking mode can be reduced, and the reliability of signal transmission is improved.
  • an object of the embodiments of the present invention is to provide a pilot insertion method for an orthogonal frequency division multiplexing system to solve the channel estimation problem in the block repeated multiple access mode.
  • Another object of an embodiment of the present invention is to provide a pilot insertion apparatus for an orthogonal frequency division multiplexing system, and a corresponding base station and a UE.
  • a pilot insertion method for an orthogonal frequency division multiplexing system includes:
  • the data unit block and the dedicated pilot symbols in the basic unit block are weighted and repeated to obtain a plurality of repeating unit blocks.
  • a pilot insertion method for an orthogonal frequency division multiplexing system includes:
  • a common pilot symbol is inserted in the plurality of repeating unit blocks.
  • a pilot insertion device for an Orthogonal Frequency Division Multiplexing system includes:
  • a dedicated pilot insertion unit for inserting at least one dedicated pilot symbol in a basic unit block generated by the transmitting device
  • a pilot insertion device for an Orthogonal Frequency Division Multiplexing system includes:
  • a repeating unit for modulating and mapping the plurality of repeated data unit blocks to generate a plurality of repeating unit blocks
  • a common pilot insertion unit for inserting common pilot symbols in the plurality of repeating unit blocks.
  • a base station comprising:
  • Base station basic unit block unit for generating a basic unit block
  • a base station-specific pilot insertion unit for inserting at least one dedicated pilot symbol in a basic unit block
  • a base station first weighting unit for weighting and repeating data unit blocks and dedicated pilot symbols in the basic unit block to obtain a plurality of repeating unit blocks.
  • a base station comprising:
  • a base station second weighting unit for weighting and repeating the data unit block to obtain a plurality of repeated data unit blocks
  • a base station repeating unit for modulating and mapping the plurality of repeated data unit blocks to generate a plurality of repeating unit blocks
  • a base station common pilot insertion unit for inserting common pilot symbols in the plurality of repeating unit blocks.
  • a user equipment including:
  • terminal basic unit block unit for generating a basic unit block
  • a terminal-specific pilot insertion unit for inserting at least one dedicated pilot symbol in a basic unit block
  • the present invention provides an explicit pilot insertion method, thereby solving the channel estimation problem in the block repeat multiple access mode.
  • the dedicated pilot symbol or the common pilot symbol can be conveniently inserted into the repeating unit block, so that the receiving end can receive the repeated unit block according to the
  • the pilot symbols in the channel accurately estimate the state of the wireless channel and the channel response, so that the received signal can be correctly detected and demodulated.
  • 1 is a schematic diagram of a conventional PRB in an OFDM modulation mode
  • FIG. 2 is a flow chart of Embodiment 1 of the present invention.
  • Figure 3-la, Figure 3-lb, Figure 3-lc, Figure 3-2a, Figure 3-2b, Figure 3-2c, Figure 3-2d and Figure 3-3 are the insertion guides in the basic unit block in the present invention. Schematic diagram of frequency symbols;
  • FIG. 4 is a flow chart of Embodiment 2 of the present invention.
  • FIG. 5 is a schematic diagram of a scatter antenna design for a MIMO antenna according to the present invention
  • FIG. 6 is a schematic diagram of a pilot insertion apparatus for an OFDM system
  • FIG. 7 is a schematic diagram of a pilot insertion apparatus of another orthogonal frequency division multiplexing system
  • FIG. 8 is a schematic diagram of a base station proposed by the present invention.
  • FIG. 9 is a schematic diagram of another base station proposed by the present invention.
  • FIG. 10 is a schematic diagram of a UE proposed by the present invention.
  • FIG. 2 shows the flow of the method.
  • step 21 the data unit block is modulated and mapped to generate a basic unit block.
  • the data included in the basic unit block may be mapped and transmitted on one time-frequency resource unit corresponding to the OFDM modulation mode.
  • the basic unit block is the basic unit of block repeat transmission.
  • the transmission time-frequency domain resource of the OFDM modulation corresponding to the basic unit block transmission data should include at least one OFDM symbol, or include at least one subcarrier.
  • the basic unit blocks can be pre-configured or dynamically set according to specific policies. Pre-configuring a fixed base unit block has the advantage of reducing the processing complexity of the system while it is running.
  • the size of the basic unit block can be determined on a case-by-case basis, but in order to be more compatible with existing OFDM systems, it can directly be a physical resource block of the existing OFDM system (PRB, Physical Resource Block) As a basic unit block, or an integer number of consecutive PRBs to form a basic unit block.
  • PRB Physical Resource Block
  • step 22 at least one dedicated pilot symbol is inserted in the base unit block.
  • a dedicated pilot symbol is a pilot symbol that is specific to a user or a group of users for channel estimation, and cannot be used by other users.
  • the dedicated pilot symbols can be used for channel estimation of uplink and downlink data transmissions of BR-OFDM.
  • the transmitting end inserts the dedicated pilot symbol in the basic unit block
  • the receiving end can accurately estimate the state and channel response of the wireless channel according to the dedicated pilot symbol therein, thereby The received signal can be detected and demodulated correctly.
  • FIG. 3-la, 3-lb, and 3-lc are three schematic diagrams of the manner
  • Figure 3-3 is a schematic diagram of the manner.
  • the shaded part in the schematic diagram indicates the dedicated pilot symbol.
  • the pilot insertion mode shown in Figure 3-la and 3-lb can be called block pilot.
  • the pilot insertion mode shown in Figure 3-2a and 3-2b can be Referred to as a comb pilot, the pilot insertion method shown in Figures 3-2d and 3-3 can be referred to as a decentralized pilot.
  • the block pilot refers to periodically inserting pilot symbols on all subcarriers of a particular OFDM symbol.
  • Block pilot insertion is suitable for slow fading and high frequency selective wireless channels.
  • the receiving end since the dedicated pilot symbol is included in all subcarriers, the receiving end does not need to perform interpolation in the frequency domain, so it is not sensitive to the frequency selectivity of the channel.
  • the comb pilot refers to a pilot symbol inserted in the same subcarrier of all OFDM symbols.
  • the grooming pilot is better estimated under the fast fading channel.
  • the channel characteristics on the non-pilot subcarriers can only be obtained by interpolation of the channel characteristics on the pilot subcarriers, so the comb pilot is sensitive to the frequency selective fading of the channel.
  • the distributed pilot means that the pilot symbols are dispersedly placed at the time-frequency resource location of the basic unit block.
  • a basic criterion for a decentralized frequency domain is that it is less than the coherence time of the channel in the time interval and less than the coherence bandwidth of the channel in the frequency interval.
  • pilot symbols in at least one OFDM symbol for the block pilot, and to insert the pilot on at least one subcarrier for the comb pilot.
  • the symbol, for decentralized pilots, requires the insertion of pilot symbols at at least one time-frequency resource location.
  • TDM time division multiplexing
  • FDM frequency division multiplexing
  • CDM code division multiplexing
  • each dedicated pilot symbol In the TDM mode, dedicated pilot symbols of different users are inserted into different OFDM symbols; in the FDM mode, dedicated pilot symbols of different users are inserted into different subcarriers; in the CDM mode, dedicated pilot symbols of different users are used.
  • the time-frequency resource positions are overlapped, but each dedicated pilot symbol can be separately multiplied with different orthogonal sequences to obtain pilot sequences orthogonal to each other, thereby reducing interference between dedicated pilot symbols.
  • step 23 the data unit block and the dedicated pilot symbols in the basic unit block are weighted and repeated to obtain a plurality of repeating unit blocks.
  • the basic unit block should be weighted and repeated according to the repetition coefficient to obtain RF repeating unit blocks.
  • the data unit block and the dedicated pilot symbol in the basic unit block are weighted by using a weighting factor in the RC sequence.
  • the four block repeating units may be represented by BU1, BU2, BU3, and BU4, respectively.
  • C 2 multiplies the data unit block and the dedicated pilot symbol in the basic unit block to obtain BU2;
  • C 4 and the data element block in the basic block unit and dedicated pilot symbols can be multiplied to obtain BU4.
  • the RF can be predetermined or based on the source/channel/user.
  • factors that determine RF include: the resource occupancy of the system (including time and power resources), the transmission rate of the source, channel conditions (including signals and interference), and so on.
  • the change in the RF can be controlled by the user or by the system.
  • Embodiment 1 the pilot symbol insertion method shown in Embodiment 1 is applicable to both the network side and the UE.
  • the transmitting end When transmitting the downlink signal, the transmitting end is the network side, and after determining the RC sequence, the network side can transmit the information of the RC sequence through the broadcast or control channel, the time-frequency resource location where the repeating unit block is located, the block repetition pattern, and the dedicated pilot configuration information. And other related control information, the related UE is notified in advance, so that the UE can receive the repeating unit block, and the RC sequence utilized is used to weight and merge the data unit blocks in each repeated unit block.
  • the UE may also perform an inverse operation on the received dedicated pilot symbols in the plurality of block repetition units to obtain an RC sequence for weighting the dedicated pilot symbols, that is, an RC sequence for weighting the data unit block, where In this case, the network side may not notify the UE in advance of the RC.
  • the UE inverse operation obtains an RC sequence for weighting the dedicated pilot symbols, and the process includes: comparing the received dedicated pilot symbols with the dedicated pilot symbols in the unweighted case, and obtaining the dedicated pilots according to the inverse result of the comparison result. Symbol weighted RC sequence.
  • the dedicated pilot symbols received by the UE are ⁇ 1, -1, -1, 1 ⁇
  • the dedicated pilot symbols in the unweighted case obtained by the dedicated pilot configuration information are ⁇ 1, 1 , 1 . 1 ⁇
  • the RC sequence weighting the dedicated pilot symbols ⁇ 1, 1 , 1 , 1 ⁇ by the comparison and inverse operations is (1, -1 , -1 , 1 ).
  • Embodiment 1 the dedicated pilot symbols are inserted when the basic unit block is generated, and then the entire basic unit block is weighted.
  • the common pilot symbols are omnidirectional, no need to be shaped, all users of the cell can use common pilot symbols for channel estimation. Therefore, it is not necessary for the common pilot symbols to use the RC sequence for weighted repetition.
  • FIG. 4 shows the flow of the method.
  • step 41 the generated data unit block is weighted and repeated to obtain a plurality of repeated data unit blocks.
  • the data unit block should be weighted and repeated according to the repetition coefficient to obtain RF repeated data unit blocks.
  • the data unit block can be weighted and repeated using a preset RC sequence.
  • the manner of weighting and repeating the data unit block is the same as the method of weighting and repeating the basic unit block described in Embodiment 1, and details are not described herein again.
  • step 42 a plurality of repeating unit blocks are generated and mapped to the plurality of repeated data unit blocks.
  • step 43 a common pilot symbol is inserted in the plurality of repeating unit blocks.
  • At least one common pilot symbol needs to be inserted in one repeating unit block.
  • a PRB in the OFDM modulation mode can also insert at least one common pilot symbol in each PRB in units of PRB without inserting a common pilot symbol in each repeating unit block.
  • Embodiment 1 and Embodiment 2 respectively provide an explicit pilot insertion method, and the receiving end can accurately estimate the state of the wireless channel and the channel response by using the inserted pilot symbols, thereby being capable of correctly detecting and demodulating the received signal.
  • TDM time division multiplexing
  • the pilot symbols of two adjacent cells should be inserted into different OFDM symbols. Since the pilot symbols of the two cells do not overlap in time, they can be orthogonal and reduce mutual interference. For an OFDM number occupied by other cells, the cell can transmit data using the OFDM symbol.
  • data may not be transmitted, and the OFDM symbol is vacant.
  • the TDM method is mainly designed for block pilots and decentralized pilots.
  • Frequency Division Multiplexing (FDM) mode The pilot symbols of two adjacent cells are inserted into different orthogonal subcarriers, and since the pilot symbols of the two cells are orthogonal in the frequency domain, interference between each other can be reduced. For a subcarrier occupied by another cell, the cell can use the subcarrier to transmit data.
  • FDM Frequency Division Multiplexing
  • the data may not be transmitted, and the subcarriers are vacant.
  • the FDM method is mainly designed for comb pilots and decentralized pilots.
  • CDM Code Division Multiplexing
  • the pilot sequences of different cells are selected by multiplying one of the orthogonal sequences to obtain a weighted pilot sequence. Due to the orthogonality of the sequences, the pilot symbols of different cells can be reduced to each other.
  • the three methods of inserting the pilot symbols can be used only in one of them, or can be used in combination, and details are not described herein again.
  • pilot symbols in BR-OFDM systems also requires consideration of multiple antennas.
  • multiple antennas are usually used to transmit data, thereby improving the transmission capability of the system.
  • a typical application is Multiple Input Multiple Output (MIMO) technology.
  • MIMO Multiple Input Multiple Output
  • the antenna can be divided into a virtual antenna and a physical antenna.
  • the so-called virtual antenna refers to the number of antennas that the receiving end needs to distinguish between the transmitting ends
  • the physical antenna refers to the number of physical antennas actually used by the transmitting end when transmitting data.
  • the receiving end needs to be able to separately estimate the channel information of each virtual antenna transmitting data from the transmitting end to the receiving end. Therefore, each virtual antenna requires a separate pilot to distinguish.
  • the pilots of different virtual antennas can be distinguished by TDM, FDM or CDM.
  • each antenna has a separate pilot symbol, and the pilot symbols between the antennas are inserted into different OFDM symbols, and are kept positive by non-overlapping in time. Intercourse.
  • each antenna When the pilot symbols are inserted in the FDM mode, each antenna has a separate pilot symbol in the downlink transmission of the same cell, and the pilot symbols between the antennas are inserted into different subcarriers, and are kept positive by non-overlapping in the frequency domain. Intercourse.
  • the pilot symbols When the pilot symbols are inserted in the CDM mode, the pilot symbols of all antennas are inserted into the same time-frequency resource position in the downlink transmission of the same cell, but the pilot symbols of the antennas are multiplied by different orthogonal sequences to obtain mutual Orthogonal pilot symbols.
  • the pilot of each antenna may select one of the orthogonal pilot symbols to maintain the orthogonality of the multi-antenna pilot symbols in the form of code divisions, thereby enabling the receiving end to estimate the channel information based on the orthogonal pilot symbols.
  • N b N bt x N bf
  • N bt the number of OFDM symbols
  • N bf the number of subcarriers.
  • the pilot symbols corresponding to each virtual antenna must be included in the N bt OFDM symbols.
  • each virtual antenna must be corresponding to each of the N bf subcarriers. Pilot symbols;
  • pilot symbols can be multiplexed using TDM, FDM, and CDM.
  • Figure 5 shows the design of a 2 x 2 MIMO dedicated spread pilot.
  • the basic unit block shown in Fig. 6 includes 4 OFDM symbols and 4 subcarriers, and a total of 16 time-frequency resource locations.
  • Four pilot symbols are inserted in each of the four time-frequency resource locations of the basic unit block, occupying two of the two OFDM symbols.
  • the pilot symbol density in the frequency domain is the same as for a single antenna. Since the pilot symbols are inserted in two OFDM symbols, the antenna 1 can select the pilot symbol 1 as its pilot symbol, and the antenna 2 can select the pilot symbol 2 as its pilot symbol.
  • the pilot symbols in the two OFDM symbols can also be multiplied by an orthogonal sequence of length 2 to distinguish between antenna 1 and antenna 2 by different orthogonal sequences.
  • Fig. 6 is a diagram showing a pilot insertion apparatus of an orthogonal frequency division multiplexing system, and the apparatus shown in Fig. 6 includes a dedicated pilot insertion unit S61 and a first weighting unit S62.
  • the dedicated pilot insertion unit S61 is configured to insert at least one dedicated pilot symbol in a basic unit block generated by the transmitting device; the first weighting unit S62 is configured to weight the data unit block and the dedicated pilot symbol in the basic unit block, Repeat to get multiple repeating unit blocks.
  • the dedicated pilot insertion unit S61 may insert a dedicated pilot symbol on at least one subcarrier of the same OFDM symbol in the basic unit block, and FIG. 3-la, 3-lb, and 3-lc are respectively three schematic diagrams of the manner;
  • the dedicated pilot insertion unit S61 may also insert a dedicated pilot symbol on the same subcarrier of at least one OFMD symbol in the basic unit block, and FIGS. 3-2a, 3-2b, 3-2c, and 3-2d are respectively four of the modes.
  • the dedicated pilot insertion unit S61 may also insert dedicated pilot symbols on different subcarriers of a plurality of OFDM symbols of the basic unit block, and Fig. 3-3 is a schematic diagram of the manner.
  • the first weighting unit S62 multiplies each weighting factor in the RC sequence by the data unit block and the dedicated pilot symbol in the plurality of basic unit blocks and repeats modulation to respectively respectively in the plurality of basic unit blocks Data unit blocks and dedicated pilot symbols are weighted and repeated.
  • pilot symbols in BR-OFDM systems also requires consideration of multiple antennas.
  • multiple antennas are usually used to transmit data, thereby improving the transmission capability of the system.
  • a typical application is Multiple Input Multiple Output (MIMO) technology.
  • MIMO Multiple Input Multiple Output
  • the antenna can be divided into a virtual antenna and a physical antenna.
  • the so-called virtual antenna refers to the number of antennas that the receiving end needs to distinguish between the transmitting ends
  • the physical antenna refers to the number of physical antennas actually used by the transmitting end when transmitting data.
  • the receiving end needs to be able to separately estimate the channel information of each virtual antenna transmitting data from the transmitting end to the receiving end. Therefore, each virtual antenna requires a separate pilot to distinguish.
  • the pilots of different virtual antennas can be distinguished by TDM, FDM or CDM.
  • each antenna has a separate pilot symbol, and the pilot symbols between the antennas are inserted into different OFDM symbols, and are kept positive by non-overlapping in time. Intercourse.
  • each antenna When the pilot symbols are inserted in the FDM mode, each antenna has a separate pilot symbol in the downlink transmission of the same cell, and the pilot symbols between the antennas are inserted into different subcarriers, and are kept positive by non-overlapping in the frequency domain. Intercourse.
  • the pilot symbols of all antennas are inserted into the same time-frequency resource position in the downlink transmission of the same cell, but the pilot symbols of the antennas are multiplied by different orthogonal sequences to obtain mutual Orthogonal pilot symbols.
  • the pilot of each antenna may select one of the orthogonal pilot symbols to maintain the orthogonality of the multi-antenna pilot symbols in the form of code divisions, thereby enabling the receiving end to estimate the channel information based on the orthogonal pilot symbols.
  • the dedicated pilot insertion unit S61 should use TDM mode or FDM.
  • the method inserts a dedicated pilot symbol, that is, inserts a dedicated pilot symbol transmitted by different antennas into a time-frequency resource position where the basic unit block does not overlap.
  • the device shown in Fig. 6 can be used for both the transmitting device on the network side and the transmitting device on the user side.
  • a dedicated pilot symbol is inserted when generating a basic unit block, and then the entire basic unit block is weighted.
  • the common pilot symbols are transmitted in an omnidirectional manner and do not need to be shaped, all users of the cell can use the common pilot symbols for channel estimation. Therefore, it is not necessary for the common pilot symbols to use the RC sequence for weighted repetition.
  • Fig. 7 is a schematic diagram of a pilot insertion apparatus of another orthogonal frequency division multiplexing system, with which a common pilot symbol can be inserted in a basic unit block.
  • a second weighting unit S71 In the apparatus shown in Fig. 7, a second weighting unit S71, a repeating unit S72, and a common pilot inserting unit S73 are included.
  • the second weighting unit S71 is configured to weight and repeat the data unit block generated by the source device to obtain a plurality of repeated data unit blocks.
  • the repeating unit S72 is configured to block and map the plurality of repeated data unit blocks to generate multiple repeating units.
  • a common pilot insertion unit S73 is configured to insert a common pilot symbol in the plurality of repeating unit blocks.
  • the second weighting unit S71 multiplies and weights each weighting factor in the RC sequence with the data unit block to weight and repeat the data unit block.
  • the common pilot insertion unit S73 should insert at least one common pilot symbol in each of the plurality of repeating unit blocks.
  • the common pilot insertion unit S73 may insert a common pilot symbol on at least one subcarrier of the same OFDM symbol in each block repetition unit, or may insert a common pilot on the same subcarrier of at least one OFMD symbol in each block repetition unit. Symbols may also insert common pilot symbols on different subcarriers of a plurality of OFDM symbols of each block repeating unit.
  • the common pilot insertion unit S73 can also be in units of PRB, and at least inserted in each PRB.
  • a common pilot symbol can be used without having to insert a common pilot symbol in each repeating unit block.
  • the common pilot insertion unit S73 should insert the common pilot symbols in TDM mode or FDM mode, that is, the common pilot symbols transmitted by different antennas are inserted into the basic unit block. Overlapping time-frequency resource locations.
  • Figure 8 is a schematic diagram of a base station including a base station basic unit block unit S81, a base station dedicated pilot insertion unit S82, and a base station first weighting unit S83.
  • Base station basic unit block unit S81 is used to generate basic unit block, base station dedicated pilot insertion unit
  • the base station first weighting unit S83 is configured to weight and repeat the data unit block and the dedicated pilot symbol in the basic unit block to obtain a plurality of repeated unit blocks.
  • the base station-specific pilot insertion unit S82 may insert a dedicated pilot symbol on at least one subcarrier of the same OFDM symbol in the basic unit block, and FIGS. 3-la, 3-lb, and 3-lc are three schematic diagrams of the manner;
  • the base station-specific pilot insertion unit S82 may also insert dedicated pilot symbols on the same subcarrier of at least one OFMD symbol in the basic unit block, and FIGS. 3-2a, 3-2b, 3-2c, and 3-2d are respectively in this manner.
  • FIGS. 3-2a, 3-2b, 3-2c, and 3-2d are respectively in this manner.
  • the base station-specific pilot insertion unit S82 may also insert dedicated pilot symbols on different subcarriers of a plurality of OFDM symbols of the basic unit block, and FIG. 3-3 is a schematic diagram of the manner.
  • the base station first weighting unit S83 multiplies each weighting factor in the RC sequence by the data unit block and the dedicated pilot symbol in the plurality of basic unit blocks and repeats modulation to data in the plurality of basic unit blocks Unit blocks and dedicated pilot symbols are weighted and repeated.
  • pilot symbols in BR-OFDM systems also requires consideration of multiple antennas.
  • multiple antennas are usually used to transmit data, thereby improving the transmission capability of the system.
  • a typical application is Multiple Input Multiple Output (MIMO) technology.
  • MIMO Multiple Input Multiple Output
  • the antenna can be divided into a virtual antenna and a physical antenna.
  • the so-called virtual antenna refers to the number of antennas that the receiving end needs to distinguish between the transmitting ends
  • the physical antenna refers to the number of physical antennas actually used by the transmitting end when transmitting data.
  • the receiving end needs to be able to separately estimate the channel information of each virtual antenna transmitting data from the transmitting end to the receiving end. Therefore, each virtual antenna requires a separate pilot to distinguish.
  • the pilots of different virtual antennas can be distinguished by TDM, FDM or CDM.
  • each antenna When the pilot symbol is inserted in the TDM mode, each antenna has a downlink transmission in the same cell.
  • the individual pilot symbols, the pilot symbols between the antennas are inserted into different OFDM symbols, and the orthogonality is maintained by non-overlapping in time.
  • each antenna When the pilot symbols are inserted in the FDM mode, each antenna has a separate pilot symbol in the downlink transmission of the same cell, and the pilot symbols between the antennas are inserted into different subcarriers, and are kept positive by non-overlapping in the frequency domain. Intercourse.
  • the pilot symbols of all antennas are inserted into the same time-frequency resource position in the downlink transmission of the same cell, but the pilot symbols of the antennas are multiplied by different orthogonal sequences to obtain Pilot symbols that are orthogonal to each other.
  • the pilot of each antenna may select one of the orthogonal pilot symbols to maintain the orthogonality of the multi-antenna pilot symbols in the form of code divisions, thereby enabling the receiving end to estimate the channel information based on the orthogonal pilot symbols.
  • the base station-specific pilot insertion unit S82 should insert the dedicated pilot symbols in the TDM mode or the FDM mode, that is, the dedicated pilot symbols transmitted by the different antennas are inserted into the time-frequency resource positions where the basic unit blocks do not overlap.
  • Figure 9 is a schematic diagram of another base station including a data unit block unit S91, a base station second weighting unit S92, a base station repeating unit S93, and a base station common pilot insertion unit S94.
  • the data unit block unit S91 is configured to generate a data unit block
  • the base station second weighting unit S92 is configured to weight and repeat the data unit block to obtain a plurality of repeated data unit blocks.
  • the base station repeating unit S93 is configured to block and map the plurality of repeated data unit blocks to generate a plurality of repeated unit blocks, and the base station common pilot insertion unit S94 is configured to insert a common pilot symbol in the plurality of repeated unit blocks.
  • the base station second weighting unit S92 multiplies each weighting factor in the RC sequence by the data unit block and repeats the modulation to weight and repeat the data unit block.
  • the base station common pilot insertion unit S94 should insert at least one common pilot symbol in each of the plurality of repeating unit blocks.
  • the base station common pilot insertion unit S94 may insert a common pilot symbol on at least one subcarrier of the same OFDM symbol in each block repetition unit, or may insert a common guide on the same subcarrier of at least one OFMD symbol in each block repetition unit.
  • the frequency symbols may also insert common pilot symbols on different subcarriers of a plurality of OFDM symbols of each block repeating unit.
  • the base station common pilot insertion unit S94 can also be a PRB. Unit, insert at least one common pilot symbol in each PRB without inserting a common pilot symbol in each repeating unit block.
  • the base station common pilot insertion unit S94 should insert the common pilot symbols in the TDM mode or the FDM mode, that is, insert the common pilot symbols transmitted by the different antennas into the time-frequency resource positions where the basic unit blocks do not overlap.
  • FIG. 10 is a schematic diagram of a UE including a terminal basic unit block unit S101, a terminal dedicated pilot insertion unit S102, and a terminal weighting unit S103.
  • the terminal basic unit block unit S101 is configured to generate a basic unit block
  • the terminal-specific pilot insertion unit S102 is configured to insert at least one dedicated pilot symbol in the basic unit block
  • the terminal weighting unit S103 is configured to use the data unit in the basic unit block The block and the dedicated pilot symbols are weighted and repeated to obtain a plurality of repeating unit blocks.
  • the terminal-specific pilot insertion unit S 102 may insert a dedicated pilot symbol on at least one subcarrier of the same OFDM symbol in the basic unit block, and FIG. 3-la, 3-lb, and 3-lc are respectively three schematic diagrams of the manner;
  • the terminal-specific pilot insertion unit S102 may also insert a dedicated pilot symbol on the same subcarrier of at least one OFMD symbol in the basic unit block, and FIGS. 3-2a, 3-2b, 3-2c, and 3-2d are respectively in this manner.
  • FIGS. 3-2a, 3-2b, 3-2c, and 3-2d are respectively in this manner.
  • the terminal-specific pilot insertion unit S102 may also insert a dedicated pilot symbol on different subcarriers of a plurality of OFDM symbols of the basic unit block, and FIG. 3-3 is a schematic diagram of the manner.
  • the terminal weighting unit S103 multiplies each weighting factor in the RC sequence by the data unit block and the dedicated pilot symbol in the plurality of basic unit blocks and repeats modulation to the data unit block in the plurality of basic unit blocks Weighted and repeated with dedicated pilot symbols.
  • the terminal-specific pilot insertion unit S 102 should insert the dedicated pilot symbols in the TDM mode or the FDM mode, that is, the dedicated pilot symbols transmitted by the different antennas are inserted into the time-frequency resource positions where the basic unit blocks do not overlap.
  • the transmitting end When transmitting the downlink signal, the transmitting end is the network side, and after determining the RC sequence, the network side can transmit the information of the RC sequence through the broadcast or control channel, the time-frequency resource location where the repeating unit block is located, the block repetition pattern, and the dedicated pilot configuration information. And other relevant control information to notify the relevant UE in advance, so that the UE can receive the repeating unit block, and utilize the RC sequence for the number in each repeating unit block. Weighted and merged according to the unit block.
  • the UE may also perform an inverse operation on the received dedicated pilot symbols in the plurality of block repetition units to obtain an RC sequence for weighting the dedicated pilot symbols, that is, an RC sequence for weighting the data unit block, where In this case, the network side may not notify the UE in advance of the RC.
  • the UE In order for the UE to perform an inverse operation to obtain an RC sequence for weighting dedicated pilot symbols, the UE should also include a comparison unit and a parsing unit.
  • the comparing unit is configured to compare the received dedicated pilot symbol with the dedicated pilot symbol in the unweighted case after receiving the repeated unit block in which the dedicated pilot symbol is inserted; the analyzing unit is configured to inverse the comparison result according to the comparison unit The operation obtains an RC sequence that weights the dedicated pilot symbols.
  • the dedicated pilot symbols received by the UE are ⁇ 1, -1, -1, 1 ⁇
  • the dedicated pilot symbols in the unweighted case obtained by the dedicated pilot configuration information are ⁇ 1, 1 , 1 . 1 ⁇
  • the RC sequence weighting the dedicated pilot symbols ⁇ 1, 1 , 1 , 1 ⁇ by the comparison and inverse operations is (1, -1 , -1 , 1 ).
  • DSPs digital signal processors
  • ASICs application specific integrated circuits
  • FPGAs field programmable gate arrays
  • a general purpose processor may be a microprocessor, but in another case the processor may be any conventional processor, controller, microcontroller or state machine.
  • the processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such structure.
  • the steps of the method described in connection with the above disclosed embodiments may be embodied directly in hardware, a software module executed by a processor, or a combination of both.
  • Software modules may exist in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.
  • a typical storage medium is coupled to the processor such that the processor can read information from the storage medium and can write information to the storage medium.
  • the storage medium is an integral part of the processor.
  • the processor and storage medium may exist in an ASIC.
  • the ASIC may exist in a subscriber station.
  • the processor and storage medium may exist as discrete components in the subscriber station.
  • the present invention can be implemented by means of software plus a necessary general hardware platform. Based on such understanding, the technical solution of the present invention can be embodied in the form of a software product in essence or in the form of a software product, which can be stored in a storage medium such as a ROM/RAM or a disk. , an optical disk, etc., includes instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention or portions of the embodiments.
  • a computer device which may be a personal computer, server, or network device, etc.
  • the invention is applicable to a wide variety of general purpose or special purpose computing system environments or configurations.
  • personal computer server computer, handheld or portable device, tablet device, multiprocessor system, microprocessor based system, set-top box, programmable consumer electronics device, network PC, small computer, mainframe computer, including A distributed computing environment of any of the above systems or devices, and the like.
  • the invention may be described in the general context of computer-executable instructions executed by a computer, such as a program module.
  • program modules include routines, programs, objects, components, data structures, and the like that perform particular tasks or implement particular abstract data types. You can also practice this in a distributed computing environment.
  • Invention in these distributed computing environments, tasks are performed by remote processing devices that are connected through a communication network.
  • program modules can be located in both local and remote computer storage media including storage devices.

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

Abstract

L'invention concerne un procédé, un dispositif, une station de base et un équipement d'utilisateur destinés à une insertion de fréquence pilote dans un système MROF. Le procédé selon l'invention consiste à : générer un bloc unitaire de base; insérer au moins un symbole de fréquence pilote spéciale dans le bloc unitaire de base; pondérer et répéter un bloc unitaire de données et le symbole de fréquence pilote spéciale dans ledit bloc unitaire de base pour obtenir plusieurs blocs unitaires de répétition.
PCT/CN2008/072865 2007-10-30 2008-10-29 Procédé, dispositif, station de base et équipement d'utilisateur destinés à une insertion de fréquence pilote dans un système mrof Ceased WO2009059536A1 (fr)

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CN200710164389.3 2007-10-30
CNA2007101643893A CN101431490A (zh) 2007-10-30 2007-10-30 正交频分复用系统的导频插入方法、装置、基站和用户设备

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CN102035777B (zh) * 2009-09-24 2014-03-12 中兴通讯股份有限公司 解调导频的处理方法和系统、配置方法、基站、用户设备
CN102082755B (zh) * 2010-01-11 2016-06-08 电信科学技术研究院 一种下行导频的传输方法、装置
CN103259610B (zh) * 2012-02-15 2016-06-15 华为技术有限公司 基于重复编码传输数据的方法、装置及系统
US9705581B2 (en) 2014-09-24 2017-07-11 Mediatek Inc. Synchronization in a beamforming system
US10396873B2 (en) 2014-09-24 2019-08-27 Mediatek Inc. Control signaling in a beamforming system
CN107465640A (zh) * 2016-06-03 2017-12-12 中兴通讯股份有限公司 数据单元的发送、处理方法及装置、站点
CN107483162B (zh) * 2016-06-08 2020-10-27 工业和信息化部电信研究院 一种终端专用导频调度方法和装置
CN108024360B (zh) * 2016-11-04 2023-11-21 华为技术有限公司 免授权传输的方法、终端和网络设备

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