WO2008025255A1 - Procédé et système de traitement de signal de référence dans un système ofdm - Google Patents

Procédé et système de traitement de signal de référence dans un système ofdm Download PDF

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Publication number
WO2008025255A1
WO2008025255A1 PCT/CN2007/002554 CN2007002554W WO2008025255A1 WO 2008025255 A1 WO2008025255 A1 WO 2008025255A1 CN 2007002554 W CN2007002554 W CN 2007002554W WO 2008025255 A1 WO2008025255 A1 WO 2008025255A1
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WIPO (PCT)
Prior art keywords
user
symbol
ofdm
symbols
reference symbols
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PCT/CN2007/002554
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English (en)
French (fr)
Inventor
Shiqiang Suo
Shaohui Sun
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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 WO2008025255A1 publication Critical patent/WO2008025255A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0001Arrangements for dividing the transmission path
    • H04L5/0003Two-dimensional division
    • H04L5/0005Time-frequency
    • H04L5/0007Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/005Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal

Definitions

  • the present invention relates to the Orthogonal Frequency Division Multiplexing (OFDM) technology in the field of communications, and in particular to a method and a system for processing reference symbols in an OFDM system.
  • OFDM Orthogonal Frequency Division Multiplexing
  • frequency domain scheduling technology is used to select appropriate subbands of transmission data for different users, thereby fully utilizing broadband. Frequency resources in a communication system.
  • a system using OFDM modulation in the downlink direction needs to provide downlink channel quality measurement by transmitting reference symbols, and performs frequency domain scheduling according to channel quality measurement results.
  • OFDM systems use a variety of multi-antenna transmission techniques to improve the spectral efficiency of the system, such as: spatial multiplexing technology, transmit diversity technology, beamforming technology, etc., transmit diversity technology is further divided into closed-loop transmit diversity technology and open loop Transmit diversity technology; spatial multiplexing technology is further divided into closed-loop spatial multiplexing technology and open-loop spatial multiplexing technology.
  • the closed-loop transmit diversity technique and the closed-loop spatial multiplexing technique are implemented using linear spatial precoding techniques.
  • Different multi-antenna techniques require different reference symbols, where closed-loop transmit diversity techniques, closed-loop spatial multiplexing techniques, and beamforming techniques require the use of user-specific reference symbols, all of which can be described using a spatial linear transform operation.
  • the L data streams X form a corresponding transmission signal Y on the M antennas by a spatial domain linear transformation operation.
  • the transmit signal ⁇ can be expressed as: where the dimension of X is Lxl, the dimension of Y is Mxl, and the dimension of V is MxL.
  • the linear spatial domain transform operation is a closed-loop transmit diversity technique or a beamforming technique.
  • L>1 the linear spatial domain transform operation is a closed-loop spatial multiplexing technique.
  • Figure 2 shows a structure of a radio frame in an OFDM modulated system.
  • a radio frame is 10 ms long, and each frame is divided into 20 equal-length subframes, each of which has a length of 0.5 ms.
  • the radio frame structure can be applied to a frequency division duplex system or a time division duplex system. When the frame structure is used for time division duplex operation, a part of the subframes can be allocated to the downlink transmission. Each subframe contains 7 or 6 OFDM symbols.
  • FIG 3 shows another structure of a system radio frame for OFDM modulation, which is only suitable for time division duplex systems.
  • a radio frame is 10 ms long.
  • Each frame contains two radio sub-frames with a length of 5 ms.
  • Each radio sub-frame contains 7 service slots of TS0 to TS6.
  • the gap has a length of 0.675ms and can contain 9 or 8 OFDM
  • the special interval between the downlink time slot and the uplink time slot is the transition point DUSP, and the uplink time slot to the downlink time
  • the special interval of the slot is the switching point UDSP.
  • Discretely distributed reference symbols in the frequency domain referred to as a first reference symbol and a second reference symbol, respectively, are used to provide channel quality measurements in the downlink direction and channel estimation in the downlink direction.
  • FIGS. 4 and 5 show the insertion manner of the two sets of reference symbols inserted in the radio frame shown in FIGS. 2 and 3, that is, the first reference symbol 1 ⁇ and the second reference symbol R 2 , respectively.
  • Same set of reference symbols differ P subcarriers in the frequency domain, P value of 6, a first reference symbols R, the reference symbol 12 and a second interleaved in the frequency domain.
  • the reference symbols set in the OFDM symbols can only support open-loop transmit diversity techniques, open-loop spatial multiplexing techniques, and frequency domain scheduling, and cannot support frequency domain scheduling and beamforming techniques in multi-antenna technology. Closed loop transmit diversity techniques and/or closed loop spatial multiplexing techniques are used simultaneously.
  • the existing system also does not provide an effective mechanism to ensure that the system can flexibly according to different transmission schemes.
  • Different reference symbol settings are provided to flexibly support frequency domain scheduling and a variety of different multi-antenna techniques. Summary of the invention
  • Embodiments of the present invention provide a method and system for processing reference symbols in an OFDM system, which are used to solve the problem of not being able to flexibly support frequency domain scheduling and multiple different multi-antenna technologies in the prior art.
  • a method of processing reference symbols in an OFDM system comprising the steps of:
  • the transmitting end inserts a common reference symbol in the orthogonal frequency division multiplexing OFDM symbol in the time slot according to the antenna required to transmit the shared control signaling;
  • the transmitting end inserts a user-specific reference symbol in the OFDM symbol according to the multi-antenna technology used;
  • the transmitting end transmits an OFDM symbol including the common reference symbol and/or the user-specific reference symbol; and the receiving end extracts the common reference symbol and/or the user-specific reference symbol after receiving the OFDM symbol.
  • each of the transmission antennas required for transmitting the shared control signaling is respectively set at the transmitting end to set a common reference symbol, and the common reference symbol is inserted into the OFDM symbol.
  • each transmitting antenna required for transmitting shared control signaling is transmitted at the transmitting end.
  • a set of user-specific reference symbols are also separately set, and the user-specific reference symbols are inserted into the OFDM symbols.
  • the common reference symbol is inserted into a first OFDM symbol of all physical resource blocks in one slot, and the user-specific reference symbol is inserted into a third OFDM symbol in a physical resource block occupied by the receiving end user. .
  • the same set of common reference symbols are evenly distributed on the subcarriers of the OFDM symbol, and different sets of common reference symbols differ in frequency domain by a certain number of subcarriers; user-specific symbols of the same group are evenly distributed in OFDM in the physical resource block occupied by the receiver user On the subcarriers of the symbol, different sets of user-specific symbols differ in frequency domain by a certain number of subcarriers.
  • two common reference symbols are respectively set at the transmitting end for each transmission antenna required for transmitting the shared control signaling, and the two sets of common reference symbols are respectively inserted into the 'different OFDM symbols.
  • the two sets of common reference symbols are respectively inserted onto the first OFDM symbol and the third last OFDM symbol of all physical resource blocks in one slot.
  • the same set of common reference symbols are evenly distributed on the subcarriers of the OFDM symbol, and different sets of common reference symbols differ in frequency domain by a certain number of subcarriers.
  • the transmitting end corresponds to each of the other transmitting antennas except the antenna that transmits the transmission sharing control signaling.
  • Two sets of user-specific reference symbols are respectively set, and the two sets of user-specific reference symbols are preferably divided.
  • two sets of user-specific reference symbols corresponding to each of the other transmission antennas are respectively inserted into The receiving end user occupies the first OFDM symbol and the third last OFDM symbol in the physical resource block.
  • the same group of user-specific reference symbols are evenly distributed on the subcarriers of the OFDM symbol, and different sets of user-specific reference symbols and common reference symbols are in the frequency domain. A certain number of subcarriers.
  • the reference symbol is transmitted on an antenna corresponding to the common reference symbol and the user-specific reference symbol. Further, the receiving end user performs channel quality measurement of the frequency domain according to the common reference symbol, and demodulates the data symbol transmitted by the transmitting end by using the common reference symbol and the user-specific reference symbol.
  • the multi-antenna technology used between the transmitting end and the receiving end is a beamforming technology, a closed-loop transmit diversity, or a closed-loop spatial multiplexing technology
  • two sets of user-specific reference symbols are respectively set corresponding to each transmitted data stream, and the two groups
  • the user-specific reference symbols are respectively inserted into different OFDM symbols in the physical resource block occupied by the receiving end user.
  • two sets of user-specific reference symbols corresponding to the same transport stream are respectively inserted on the first OFDM symbol and the third last OFDM symbol in the physical resource block of the receiving end user; or the user-specific reference The symbols are respectively inserted into the physical resource block occupied by the user at the receiving end. On the second OFDM symbol and on the third last OFDM symbol.
  • the same set of user-specific reference symbols are evenly distributed on the subcarriers of the OFDM symbol, and different sets of user-specific reference symbols and/or common reference symbols are in the frequency domain. A certain number of subcarriers differ.
  • the reference symbol is transmitted on an antenna corresponding to the common reference symbol; user-specific reference symbols are transmitted on all antennas using beamforming techniques, closed-loop transmit diversity, or closed-loop spatial multiplexing techniques.
  • the receiving end user performs channel quality measurement of the frequency domain scheduling according to the common reference symbol, and demodulates the data symbol sent by the transmitting end by using the user-specific reference symbol.
  • a transmitting device in an OFDM system comprising:
  • a setting unit configured to: in a time slot in which the shared control signaling is sent, insert a common reference symbol in an OFDM symbol in the time slot according to an antenna required to transmit the shared control signaling, and in the OFDM symbol according to the multi-antenna technology used Insert user-specific reference symbols;
  • a sending unit configured to send an OFDM symbol that includes the common reference symbol and/or the user-specific reference symbol.
  • the setting unit sets a common reference symbol for each transmitting antenna required for transmitting the shared control signaling, and inserts the common reference symbol into the OFDM symbol in all physical resource blocks in one slot. on.
  • the setting unit further sets a set of user-specific reference symbols corresponding to each of the transmitting antennas to be inserted into an OFDM symbol in a physical resource block occupied by the receiving end user.
  • the setting unit separately sets two sets of common reference symbols for each of the transmitting antennas required for transmitting the shared control signaling, and inserts the common reference symbols into different ones of all the physical resource blocks in one slot. On the OFDM symbol.
  • the setting unit respectively sets two sets of user-specific reference symbols corresponding to each of the other transmission antennas outside the transmission sharing control signaling antenna, and inserts the two sets of user-specific reference symbols into the physical resource block occupied by the receiving end user respectively. On different OFDM symbols.
  • the setting unit respectively sets two sets of user-specific reference symbols corresponding to each of the transmitted data streams, and inserts the two sets of user-specific reference symbols into the physical resource block occupied by the receiving end user respectively. On different OFDM symbols.
  • a receiving device in an OFDM system comprising:
  • a receiving unit configured to receive an OFDM symbol including a common reference symbol and a user-specific reference symbol
  • an execution unit configured to read a common reference symbol and/or a user-specific reference symbol from the OFDM symbol.
  • the performing unit performs channel quality measurement of the frequency domain scheduling according to the common reference symbol, and demodulates the data symbol sent by the transmitting end according to the common reference symbol and/or the user-specific reference symbol.
  • a communication system comprising:
  • a transmitting apparatus configured to: in a time slot in which the shared control signaling is sent, insert a common reference symbol in an OFDM symbol in the time slot according to an antenna required to transmit the shared control signaling, and in the OFDM symbol according to the multi-antenna technology used Inserting user-specific reference symbols, and transmitting OFDM symbols including the common reference symbols and/or user-specific reference symbols;
  • a receiving device configured to receive the OFDM symbol and extract the common reference symbol and/or user-specific reference symbol from the OFDM symbol.
  • the receiving device performs channel quality measurement of the frequency domain according to the extracted common reference symbols, and demodulates the data symbols sent by the transmitting end according to the common reference symbols and/or user-specific reference symbols.
  • the solution of the embodiment of the present invention is directed to an antenna for transmitting shared control signaling in a corresponding OFDM symbol.
  • the user-specific reference symbol After the user-specific reference symbol, it can flexibly support multi-antenna transmission technology, and can flexibly set reference symbols and user-specific reference symbols according to the multi-antenna transmission technology used between the transmitting end and the receiving end, so that the receiving is included.
  • the receiving end user of the OF reference symbol of the common reference symbol and the user-specific reference symbol can not only perform channel quality measurement and demodulation control signaling according to the common reference symbol in the reference symbol, but also according to the user set in the reference symbol.
  • FIG. 1 is a schematic diagram of a prior art spatial domain linear transformation
  • FIG. 2 is a schematic structural diagram of a radio frame in a system of the prior art OFDM modulation
  • FIG. 3 is another schematic structural diagram of a radio frame in a system of the prior art OFDM modulation
  • FIG. 4 is a prior art set on an OFDM symbol. Schematic diagram of reference symbols;
  • FIG. 5 is another schematic diagram of a prior art setting reference symbols on an OFDM symbol
  • FIG. 6 is a schematic diagram of a communication system in an embodiment of the present invention.
  • FIG. 7 is a flowchart of processing performed by a transmitting end according to an embodiment of the present invention.
  • FIG. 8 is a flowchart of processing at a receiving end according to an embodiment of the present invention.
  • FIG. 9 is a schematic diagram of setting a common reference symbol on an OFDM symbol according to an embodiment of the present invention
  • FIG. 10 is a physical resource block used by a user in an open-loop transmit diversity technique or an open-loop spatial multiplexing technique according to an embodiment of the present invention
  • Figure 11 is the hair
  • FIG. 12 is a beam used in an embodiment of the present invention.
  • FIG. 13 is a schematic diagram of setting reference symbols on an OFDM symbol in a physical resource block used by a user when a closed-loop spatial multiplexing technique is used in an embodiment of the present invention. detailed description
  • the transmitting end in the time slot in which the shared control signaling is sent, the transmitting end needs the antenna according to the transmission sharing control signaling. Inserting a common reference symbol in an Orthogonal Frequency Division Multiplexing OFDM symbol in a slot; inserting a user-specific reference symbol in an OFDM symbol in the slot according to the multi-antenna technique used; the transmitting end transmitting the common reference symbol and / or OFDM symbol of a user-specific reference symbol. when When the receiving end receives the OFDM symbol, the common reference symbol and/or the user-specific reference symbol are extracted therefrom.
  • the system of this embodiment includes a transmitting end 610 and a receiving end 620.
  • the transmitting end 610 includes a setting unit 6101 and a transmitting unit 6102.
  • the setting unit 6101 sets a common reference symbol according to an antenna required for transmitting control signaling, and sets a user-specific reference symbol according to a multi-antenna technology employed between the transmitting end and the receiving end, and inserts the reference symbol into the OFDM symbol and transmits the reference symbol.
  • Transmitting unit 6102 transmits the OFDM symbol.
  • the receiving end 620 includes a receiving unit 6201 and an executing unit 6202.
  • the receiving unit 6201 is configured to receive an OFDM symbol inserted into the reference symbol, and transmit the received OFDM symbol to the executing unit 6202.
  • the performing unit 6202 reads the reference symbol from the OFDM symbol, and the performing unit 6202 can further perform channel quality measurement of the frequency domain according to the common reference symbol, and send the signal to the transmitting end according to the user-specific reference symbol. Data symbol demodulation.
  • the multi-antenna technology used between the transmitting end and the receiving end can be based on the configuration of the system, such as the number of base station antennas, the number of terminal antennas, and the application scenario of the system (for example, meeting the data transmission rate) Or to improve the system coverage, etc., and the user location (the user is located at the cell center or the cell edge) and the spatial channel (the correlation of the spatial channel, the moving speed of the user terminal, etc.) and other factors are selected.
  • beamforming techniques can be used to improve the coverage of the system and reduce inter-cell interference.
  • spatial multiplexing technology is used.
  • the common reference symbol is set in the time slot in which the shared control signaling is sent, the common reference symbol is set according to the antenna required for the transmission sharing control signaling, and the following two methods may be used:
  • Each antenna required for transmission sharing control signaling is respectively set to insert two sets of common reference symbols into different OFDM symbols.
  • the number of antennas required for transmitting the shared control signaling is N
  • the number of sets of common reference symbols is set to 2N groups, and two sets of common reference symbols corresponding to the same antenna are respectively inserted into different OFDM symbols, and Corresponding to the manner in which the 2n-1th group and the 2nth group common reference symbols of the nth antenna are respectively inserted into the first OFDM symbol and the third last OFDM symbol of one radio subframe or one traffic slot. 2n-l and 2n The common reference symbol is transmitted on the nth antenna.
  • the same set of common reference symbols are inserted into different subcarriers on one OFDM symbol, and the number of subcarriers that differ in frequency domain is equal.
  • the plurality of sets of common reference symbols inserted on the same OFDM symbol differ in frequency domain by a fixed number of subcarriers K, that is, by Q subcarriers, and Q may have a value of zero.
  • Manner 2 A set of common reference symbols are respectively inserted into the first OFDM symbol for each antenna required for transmission sharing control signaling.
  • the antenna technology used between the transmitting end and the receiving end is single antenna technology, open loop transmit diversity technology or open loop spatial multiplexing technology, corresponding to each transmission sharing control signaling
  • the antenna further sets a set of user-specific reference symbols respectively, and the user-specific reference symbols are inserted into the third last OFDM symbol in the physical resource block occupied by the receiving end user; when the transmitting end and the receiving end use beamforming technology,
  • the closed-loop transmit diversity technique or the closed-loop spatial multiplexing technique it is not necessary to set a user-specific reference symbol for the antenna that transmits the shared control signaling.
  • the processing procedure of the transmitting end in this embodiment is as follows:
  • Step 701 The transmitting end sets a common reference symbol on the downlink transmitted OFDM symbol, and sets two common reference symbols for each transmission antenna required for transmitting the shared control signaling, where the common reference symbol is used for frequency domain scheduling by the system.
  • the channel quality measurement, demodulation and shared control signaling, and auxiliary demodulation use data symbols of open-loop multi-antenna technology (such as open-loop transmit diversity technology, open-loop spatial multiplexing technology).
  • Step 702 Determine a type of multi-antenna transmission technology used between the transmitting end and the receiving end, if the multi-antenna transmission technology used between the transmitting end and the receiving end is an open-loop transmit diversity technique or open-loop spatial multiplexing.
  • the technique proceeds to step 703; if the multi-antenna transmission technology used between the transmitting end and the receiving end is a beamforming technique, a closed-loop transmit diversity technique, or a closed-loop spatial multiplexing technique, Then, step 704 is performed; when single-antenna transmission is used between the transmitting end and the receiving end, step 705 is performed.
  • Step 703 When the multi-antenna transmission technology used between the transmitting end and the receiving end is an open-loop transmit diversity technology or an open-loop spatial multiplexing technology, in addition to the antenna transmitting the transmission sharing control signaling, corresponding to each other
  • the transmission antennas respectively set two sets of user-specific reference symbols, and the two sets of user-specific reference symbols are respectively inserted into different OFDM symbols occupied by the user in the physical resource block, and then step 705 is performed.
  • Step 704 When the multi-antenna transmission technology used between the transmitting end and the receiving end is a beamforming technology or a closed-loop transmit diversity technology or a closed-loop spatial multiplexing technology, two sets of user-specific reference are respectively set corresponding to each transmitted data stream. Symbols, the two sets of user-specific reference symbols are respectively inserted into different OFDM symbols in the physical resource block occupied by the receiving end user, and then proceed to step 705.
  • Step 705 Send an OFDM symbol including a reference symbol.
  • the inserted common reference symbols are transmitted on the corresponding antenna.
  • the multi-antenna transmission technology used by the user is an open-loop transmit diversity technique or an open-loop spatial multiplexing technique
  • the inserted user-specific reference symbols are transmitted on the corresponding antenna when transmitting; when the user uses more
  • the antenna transmission technology is beamforming technology or closed-loop transmit diversity technology or closed-loop spatial multiplexing technology
  • the inserted user-specific reference symbols first adopt beamforming technology, closed-loop transmit diversity or closed-loop spatial multiplexing technology, and then at all Send on the antenna.
  • the processing procedure of the receiving end in this embodiment is as follows:
  • Step 801 Receive an OFDM symbol including a common reference symbol, and extract the inserted common reference symbol at a common reference symbol bit of the OFDM symbol.
  • Step 802 Perform channel quality measurement for frequency domain scheduling by using the extracted common reference symbols, and obtain multi-antenna transmission technology indication information included in the downlink control signaling.
  • Step 803 Determine, according to the obtained multi-antenna transmission technology indication information, a multi-antenna transmission technology used between the transmitting end and the receiving end, if the multi-antenna transmission technology used between the transmitting end and the receiving end is an open-loop transmit diversity technology Or open-loop spatial multiplexing technology, step 804 is performed; if the multi-antenna transmission technology used between the transmitting end and the receiving end is one of beamforming technology, closed-loop transmit diversity technology or closed-loop spatial multiplexing technology In the case of step 806; sending and receiving If single antenna transmission is used between the terminals, step 805 is performed.
  • Step 804 Extract user-specific reference symbols on user-specific reference symbols on OFDM in physical resource blocks used by the receiving end user, and use the extracted user-specific reference symbols and the common reference symbols extracted in step 801 for demodulation.
  • Data symbols transmitted by the ring's transmit diversity technique or open-loop spatial multiplexing technique.
  • Step 805 directly using the common reference symbols extracted in step 801 for demodulating data symbols.
  • Step 806 Extract user-specific reference symbols on user-specific reference symbols on OFDM symbols in physical resource blocks used by the receiving end user, and use the extracted user-specific reference symbols for demodulation using beamforming techniques, closed-loop transmit diversity, or Data symbols transmitted by closed-loop spatial multiplexing techniques.
  • the multi-antenna technology adopted by the receiving end user is a single-antenna transmission technology, and the corresponding third OFDM in the physical resource block occupied by the receiving end user is extracted.
  • Each user-specific reference symbol for transmitting antennas that share control signaling, and the user-specific reference symbols and common reference symbols extracted from the first OFDM symbol are used to demodulate data symbols transmitted using a single antenna;
  • the multi-antenna technology adopted by the receiving end user is an open-loop transmit diversity technology or an open-loop spatial multiplexing technology, it is also required to extract corresponding to each of the third OFDM in the physical resource block occupied by the user at the receiving end.
  • the user-specific reference symbols of the antenna settings of the shared control signaling are transmitted, and the user-specific reference symbols, common reference symbols, and other user-specific reference symbols are used for demodulation of the data symbols.
  • the receiving end processes the received data in the time slot in which the common reference symbol is not set, and when determining that the multi-antenna technology adopted by the receiving end user is a single antenna transmission technology, an open-loop transmit diversity technology, or an open-loop spatial multiplexing technology, Deriving user-specific reference symbols on user-specific reference symbols on OFDM symbols in physical resource blocks used by the receiving end user, using the extracted user-specific reference symbols for single-antenna transmission techniques, open-loop transmit diversity techniques, or open-loop spaces Demodulation of data symbols transmitted by the multiplexing technique.
  • FIG. 9 is a schematic diagram showing the manner in which a common reference symbol is set on an OFDM symbol in the first mode.
  • the number of antennas required to transmit the shared control signaling is 2, and the number of transmitting antennas supported by the transmitting end is 2, in one traffic slot containing 9 OFDM symbols, the first OFDM symbol and the reciprocal A total of four common reference symbols are inserted on the third OFDM symbol, which are a first reference symbol R, a second reference symbol R 2 , a third reference symbol R 3 , and a fourth reference symbol R 4 .
  • first reference symbol R, and the third reference symbol R 3 is located on the first OFDM symbol
  • second reference symbol 12 and the fourth reference numeral 4 is located on the reciprocal of three OFDM symbols Zi
  • first reference symbol ⁇ 1 And the second reference symbol R 2 is transmitted on the first antenna
  • the third reference symbol 3 and the fourth reference symbol R 4 are transmitted on the second antenna
  • the same common reference symbol on the same OFDM symbol is in the frequency domain
  • the number of subcarriers P is 6, and the number of subcarriers K of the different groups of common reference symbols on the same OFDM symbol is 1 in the frequency domain, and the number of subcarriers in the frequency domain corresponding to two sets of common reference symbols of the same antenna Q is 3.
  • the other subcarriers on the OFDM symbol are used to transmit the data symbol D.
  • the multi-antenna transmission technology is used for the open-loop transmit diversity technology or the open-loop spatial multiplexing technology between the transmitting end and the receiving end, and the number of transmitting antennas at the transmitting end is the same as the number of control signaling to be sent, the user does not need to be inserted.
  • Dedicated reference symbol When the number of transmitting antennas M supported by the transmitting end is greater than the number of antennas N required for transmitting control signaling, a user-specific reference symbol needs to be inserted, and each of the other transmitting antennas corresponding to the antenna transmitting the transmission sharing control signaling is respectively set.
  • the user-specific reference symbol that is, the number of groups in which the user-specific reference symbols are inserted is 2 (M - N ), and two sets of user-specific reference symbols corresponding to the same transmission antenna are respectively inserted into different OFDM symbols.
  • User-specific reference symbols are only inserted on OFDM symbols in the physical resource blocks occupied by users using open-loop transmit diversity techniques or open-loop spatial multiplexing techniques using multi-antenna transmission techniques.
  • Figure 10 is a schematic diagram showing the setting of reference symbols on OFDM symbols in physical resource blocks used by receiver users when using open-loop transmit diversity techniques or open-loop spatial multiplexing techniques.
  • the number of transmitting antennas M supported by the transmitting end is 2, and the number of transmitting antennas N required for transmitting control signaling is 1, the number of common reference symbol groups to be inserted is 2N, and the number of user-specific reference symbol groups to be inserted is 2 (M - N ) is 2.
  • the inserted common reference symbols are respectively the first reference symbol R and the second reference symbol R 2 ; the inserted user-specific reference symbols are respectively a user-specific first reference symbol AR, and a user-specific second reference symbol AR 2 .
  • the first reference symbol R, and the user-specific first reference symbol AR are located on the first OFDM symbol, and the second reference symbol R 2 is dedicated to the user.
  • the second reference symbol 2 is located on the third last OFDM symbol; the first reference symbol and the second reference symbol R 2 are output on the ⁇ 1 antenna, the user-specific first reference symbol and the user-specific second reference symbol AR 2 Outputting on the second antenna; the same set of reference symbols on the same OFDM symbol has a phase difference subcarrier number P of 6 in the frequency domain, and different sets of reference symbols on the same OFDM symbol have phase difference subcarrier numbers K in the frequency domain.
  • the number of subcarriers Q of the two sets of reference symbols corresponding to the same antenna is 3 in the frequency domain.
  • the other subcarriers on the OFDM symbol are used to transmit the data symbol D.
  • each antenna corresponding to the transmission sharing control signaling is respectively set with a common reference symbol and A set of user-specific reference symbols is similar to that shown in FIG. 10 and will not be described again.
  • a user-specific reference symbol is inserted into the OFDM symbol in the physical resource block used by the user.
  • Two sets of user-specific reference symbols are respectively set corresponding to each of the transmitted data streams, and the two sets of user-specific reference symbols are respectively inserted into different OFDM symbols.
  • L the number of user-specific reference symbol groups inserted on the OFDM symbol
  • 2L groups the number of user-specific reference symbols inserted on the OFDM symbol
  • two sets of user-specific reference symbols corresponding to the same data stream 1 are respectively inserted into different OFDM symbols, where 21-1 The group is located on the first OFDM symbol and the 21st group is located on the third last OFDM symbol.
  • the 21-1th group and the 21st group of user-specific reference symbols are precoded using the precoding matrix corresponding to the 1st data stream, and transmitted on all antennas.
  • User-specific reference symbols belonging to the same group are uniformly inserted into the same OFDM symbol.
  • the plurality of sets of reference symbols inserted on the same OFDM symbol differ in frequency domain by a fixed number of subcarriers K (K ⁇ 0 ).
  • Two sets of user-specific reference symbols corresponding to the same data stream are interleaved in the frequency domain, that is, the Q subcarriers are different, and the value of Q may be zero.
  • FIG. 11 is a diagram showing the setting of reference symbols on OFDM symbols in physical resource blocks used by the receiving end user when the beamforming technique is used.
  • the transmitted data stream L is 1, and when the receiving end user uses the beamforming technology, the number of inserted common reference symbol groups 2N is 2, and the inserted user The number of dedicated reference symbol groups 2L is 2.
  • the inserted common reference symbols are a first reference symbol R and a second reference symbol R 2 respectively; the inserted user-specific reference symbols are respectively a user-specific first reference symbol AR, and a user-specific second reference symbol AR 2 .
  • the first reference symbol and the user-specific first reference symbol AR are located on the first OFDM symbol, and the second reference symbol R 2 and the user-specific second reference symbol AR are on the third last OFDM symbol;
  • the first reference symbol and the user-specific second reference symbol AR 2 are output on all antennas of the transmitting end;
  • the same set of reference symbols on the same OFDM symbol have a phase difference P carrier number 6 in the frequency domain, in the same OFDM
  • the different sets of reference symbols on the symbol have a phase difference subcarrier number K of 1 in the frequency domain, and two sets of user-specific reference symbols corresponding to the same data stream are interleaved in the frequency domain, and the number of phase difference subcarriers Q is 3.
  • the other subcarriers on the OFDM symbol are used to transmit the data symbol D.
  • Control signaling such that when a beamforming, a closed-loop transmit diversity technique, or a closed-loop spatial multiplexing technique is used between the transmitting end and the receiving end, an antenna corresponding to each transmission sharing control signaling may be separately set to be a common group.
  • the reference symbol is inserted into the first OFDM symbol, and user-specific reference symbols are no longer set corresponding to the antenna.
  • Figure 12 is another schematic diagram showing the setting of reference symbols on OFDM symbols in physical resource blocks used by the receiving end user when using the beamforming technique.
  • the OFDM symbol in the physical resource block used by the user is inserted.
  • the number of common reference symbol groups N is 1, and the number of additional user-specific reference symbol groups inserted is 2L.
  • the inserted common reference symbol is the first reference symbol R,; the inserted user-specific The reference symbols are respectively a user-specific first reference symbol AR, and a user-specific second reference symbol AR 2 .
  • the first reference symbol R t and the user-specific first reference symbol are located on the first OFDM symbol, and the user-specific second reference symbol AR 2 is located on the third OFDM symbol; the user-specific first reference symbol and user The dedicated second reference symbol 2 is output on all antennas of the transmitting end; the same set of reference symbols on the same OFDM symbol has a difference in the frequency domain of the number of subcarriers P, and the different sets of reference symbols on the same OFDM symbol are The number of phase difference subcarriers K in the frequency domain is 1, and two sets of user-specific reference symbols corresponding to the same data stream are interleaved in the frequency domain, and the number of phase difference subcarriers Q is 3.
  • Figure 13 shows a schematic diagram of setting reference symbols on OFDM symbols in a physical resource block used by a user when using a closed-loop spatial multiplexing technique.
  • the OFDM symbol in the physical resource block used by the user is 2L.
  • the inserted common reference symbols are respectively the first reference symbol R and the third reference symbol R 3 ;
  • the user-specific reference symbols corresponding to the insertion of the data stream 1 and the data stream 2 are respectively the user-specific first reference symbol AR user-specific second Reference symbol AR 2 , user-specific third reference symbol AR 3 , user-specific fourth reference symbol AR 4 .
  • the first reference symbol 1 and the third reference symbol R 3 are located on the first OFDM symbol, and the user-specific first reference symbol and the user-specific third reference symbol AR 3 are located on the second OFDM symbol;
  • the second reference symbol AR 2 and the user-specific fourth reference symbol A are on the third last OFDM symbol.
  • the same set of reference symbols on the same OFDM symbol has a phase difference subcarrier number P of 6 in the frequency domain, and different sets of reference symbols on the same OFDM symbol have a phase difference subcarrier number K of 1 in the frequency domain, corresponding to the same data.
  • Two sets of user-specific reference symbols of the stream are interleaved in the frequency domain, and the number of phase difference subcarriers Q is 3.
  • the other subcarriers on the OFDM symbol are used to transmit the data symbol D.
  • the embodiment of the present invention inserts a common reference symbol in an OFDM symbol, and inserts a user-specific reference symbol into an OFDM symbol according to a multi-antenna technology used between the transmitting end and the receiving end, and then sends the OFDM symbol, so that the receiving end user receives the
  • the OFDM symbols are extracted and the common reference symbols and user-specific reference symbols are extracted therefrom, which not only supports the frequency domain scheduling technology, but also supports the multi-antenna transmission technology.
  • the reference symbol is set to be inserted on the OFDM symbol of one service slot of the radio frame, but the reference symbol setting in the embodiment of the present invention is not limited thereto, and the reference symbol can also be in multiple subframes.
  • the setting of one subframe of the composed radio frame is performed on the OFDM, and the method is the same, and will not be described again.

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Description

一种在 OFDM系统中处理参考符号的方法及系统 技术领域
本发明涉及通信领域的正交频分复用 (OFDM, Orthogonal Frequency Division Multiplexing )技术, 尤其涉及一种在 OFDM系统中处理参考符号的方 法及其系统。 背景技术
目前, 在基于 OFDM的系统中, 才 据不同用户在接收端接收到的每一个 子载波的相对功率不同, 釆用频域调度技术为不同用户选择合适的传输数据 的子频段, 从而充分利用宽带通信系统中的频率资源。
下行方向上采用 OFDM调制的系统, 需要通过下发参考符号提供下行方 向的信道质量测量, 并^^据信道质量测量结果进行频域调度。
同时, OFDM 系统中使用多种多天线传输技术来提高系统的频谱效率, 例如: 空间复用技术、 发射分集技术、 波束赋形技术等, 发射分集技术进一 步分为闭环的发射分集技术和开环发射分集技术; 空间复用技术进一步分为 闭环的空间复用技术和开环的空间复用技术。 其中闭环的发射分集技术和闭 环的空间复用技术使用线性空域预编码技术实现。 不同的多天线技术需要不 同的参考符号, 其中闭环的发射分集技术、 闭环的空间复用技术和波束赋形 技术需要使用用户专用的参考符号, 它们都可以使用一个空域线性变换操作 来描述。
参阅图 1所示空域线性变换的示意图, L个数据流 X通过一个空域线性 变换操作形成 M根天线上对应的发送信号 Y。 用一个线性变换码矩阵 V来表 示该空域线性变换操作, 则发送信号 Υ可表示为: 其中 X的维数为 Lxl , Y的维数为 Mxl , V的维数为 MxL。 当发送数据流的数目 L=l时, 线 性空域变换操作即为闭环发射分集技术或波束赋形技术, 当 L>1 时, 线性空 域变换操作即闭环的空间复用技术。 图 2所示为 OFDM调制的系统中无线帧的一种结构。 一无线帧长 10ms, 每一帧分为 20个等长的子帧, 每一子帧的长度为 0.5ms。 该无线帧结构可以 适用于频分双工系统, 也可以适用于时分双工系统。 采用这种帧结构进行时 分双工的操作时, 可以将其中一部分子帧分配给下行传输。 每一子帧包含 7 个或者 6个 OFDM符号。
图 3所示为 OFDM调制的系统无线帧的另一种结构, 该无线帧结构仅适 用于时分双工系统。 一无线帧 (Radio frame )长 10ms, 每一帧包含两个长度 为 5ms的无线子帧 (Radio Sub-frame), 每一无线子帧包含 TS0 ~ TS6共 7个业 务时隙,每个业务时隙的时间长度为 0.675ms,可以包含 9个或者 8个 OFDM
Time Slot ),上行导频时隙( UpPTS, Uplink Pilot Time Slot )以及保护时隙( GP , Guard Period )„ 下行时隙到上行时隙间的特殊间隔为转换点 DUSP , 上行时 隙到下行时隙的特殊间隔为转换点 UDSP。在每两个业务时隙之间存在一个时 隙间隔 ( Timeslot Interval )。
现有技术中, 在图 2所示无线帧中的任一个子帧, 或者图 3所示无线帧 中的任一个业务时隙中的第一个和倒数第三个 OFDM符号上分别插入两组频 域上离散分布的参考符号, 分别称为第一参考符号和第二参考符号, 用于提 供下行方向的信道质量测量, 以及进行下行方向的信道估计。
图 4和图 5所示分別为图 2和图 3所示无线帧中插入的两组参考符号即 第一参考符号 1^和第二参考符号 R2的插入方式。同一组参考符号在频域上相 差 P个子载波, P取值为 6, 第一参考符号 R,和第二参考符号1 2在频域上交 错放置。
采用现有技术, 在 0FDM符号中设置的参考符号只能支持开环的发射分集 技术、 开环空间复用技术和频域调度, 不能支持频域调度与多天线技术中的 波束赋形技术、 闭环发射分集技术和 /或闭环空间复用技术同时使用。 现有系 统也未提供一种有效的机制可以保证系统能够灵活的根据不同的传输方案进 行不同的参考符号设置, 从而灵活的支持频域调度和多种不同的多天线技术。 发明内容
本发明实施例提供一种在 OFDM系统中处理参考符号的方法及系统, 用 以解决现有技术中不能灵活的支持频域调度和多种不同的多天线技术的问 题。
本发明实施例提供以下技术方案:
一种在 OFDM系统中处理参考符号的方法, 包括如下步骤:
在发送共享控制信令的时隙中, 发送端根据发送共享控制信令所需天线 在该时隙中的正交频分复用 OFDM符号中插入公共参考符号;
所述发送端根据所使用的多天线技术在 OFDM符号中插入用户专用参考 符号;
发送端发送包含所述公共参考符号和 /或用户专用参考符号的 OFDM符 号; 以及接收端接收到所述 OFDM符号后从中提取所述公共参考符号和 /或用 户专用参考符号。
其中, 在发送端对发送共享控制信令所需的每一根传输天线分别设置一 组公共参考符号, 并将该公共参考符号插入到 OFDM符号上。
发送端与接收端之间使用的多天线技术为单天线传输技术、 开环发射分 集技术或开环的空间复用技术时, 在发送端对发送共享控制信令所需的每一 根传输天线还分别设置一组用户专用参考符号, 并将该用户专用参考符号插 入到 OFDM符号上。
所述公共参考符号插入到一个时隙中的所有物理资源块中的第一个 OFDM符号上, 所述用户专用参考符号插入到接收端用户占用的物理资源块 中的倒数第三个 OFDM符号上。
在同一个 OFDM符号上,同一组的公共参考符号均匀分布在该 OFDM符 号的子载波上, 不同组的公共参考符号在频域上相差一定数目的子载波; 同 一组的用户专用符号均匀分布在该接收端用户占用的物理资源块中的 OFDM 符号的子载波上, 不同组的用户专用符号在频域上相差一定数目的子载波。 或者, 在发送端对发送共享控制信令所需的每一根传输天线分别设置两 组公共参考符号, 该两组公共参考符号分别插入到'不同的 OFDM符号上。
所述两组公共参考符号分别插入到一个时隙中的所有物理资源块中的第 一个 OFDM符号上和倒数第三个 OFDM符号上。
在同一个 OFDM符号上,同一组的公共参考符号均匀分布在该 OFDM符 号的子载波上, 不同组的公共参考符号在频域上相差一定数目的子载波。
发送端与接收端之间使用的多天线技术为开环发射分集技术或开环的空 间复用技术时, 在发送端除发送传输共享控制信令的天线外, 对应于其他每 一根传输天线分别设置两组用户专用参考符号, 该两组用户专用参考符号分 较佳的, 除发送传输共享控制信令的天线外, 对应于其他每一根传输天 线的两组用户专用参考符号分别插入到接收端用户占用物理资源块中的第一 个 OFDM符号上和倒数第三个 OFDM符号上。
在接收端用户占用物理资源块中的同一个 OFDM符号上, 同一组的用户 专用参考符号均匀分布在该 OFDM符号的子载波上, 不同组的用户专用参考 符号以及公共参考符号在频域上相差一定数目的子载波。
在公共参考符号和用户专用参考符号对应的天线上发送该参考符号。 ' 进一步, 接收端用户根据公共参考符号进行频域调度的信道质量测量, 以及利用公共参考符号和用户专用参考符号对发送端发送的数据符号解调。
发送端与接收端之间使用的多天线技术为波束赋形技术、 闭环发射分集 或闭环的空间复用技术时, 对应于每一个发送的数据流分别设置两组用户专 用参考符号, 该两组用户专用参考符号分別插入到接收端用户占用物理资源 块中的不同的 OFDM符号上。
较佳的, 对应于同一个传输流的两组用户专用参考符号分别插入到接收 端用户占用物理资源块中的第一个 OFDM符号上和倒数第三个 OFDM符号 上; 或者所述用户专用参考符号分别插入到接收端用户占用物理资源块中的 第二个 OFDM符号上和倒数第三个 OFDM符号上。
在接收端用户占用物理资源块的同一个 OFDM符号上, 同一组的用户专 用参考符号均匀分布在该 OFDM符号的子载波上, 不同组的用户专用参考符 号和 /或公共参考符号在频域上相差一定数目的子载波。
在公共参考符号对应的天线上发送该参考符号; 采用波束赋形技术、 闭 环发射分集或闭环的空间复用技术在所有天线上发送用户专用参考符号。
进一步, 接收端用户根据公共参考符号进行频域调度的信道质量测量, 以及利用用户专用参考符号对发送端发送的数据符号解调。
一种 OFDM系统中的发射装置, 包括:
设置单元, 用于在发送共享控制信令的时隙中, 根据发送共享控制信令 所需天线在该时隙中的 OFDM符号中插入公共参考符号, 以及根据所使用的 多天线技术在 OFDM符号中插入用户专用参考符号;
发送单元, 用于发送包含所述公共参考符号和 /或用户专用参考符号的 OFDM符号。
较佳的, 所述设置单元对发送共享控制信令所需的每一根发送天线设置 一组公共参考符号, 并将该公共参考符号插入到一个时隙中的所有物理资源 块中的 OFDM符号上。
所述设置单元对应于每一根所述发送天线还设置一组用户专用参考符号 插入到接收端用户占用的物理资源块中的 OFDM符号上。
或者, 所述设置单元对发送共享控制信令所需的每一^ ^发送天线分别设 置两组公共参考符号, 并将该公共参考符号插入到一个时隙中的所有物理资 源块中的不同的 OFDM符号上。
所述设置单元对应于传输共享控制信令天线外的其他每一根传输天线分 别设置两组用户专用参考符号 , 并将该两组用户专用参考符号分别插入到接 收端用户占用物理资源块中的不同的 OFDM符号上。
所述设置单元对应于每一个发送的数据流分别设置两组用户专用参考符 号, 并将该两组用户专用参考符号分别插入接收端用户占用物理资源块中的 不同的 OFDM符号上。
一种 OFDM系统中的接收装置, 包括:
接收单元, 用于接收包含公共参考符号和用户专用参考符号的 OFDM符 号 · 执行单元,用于从所述 OFDM符号中读取公共参考符号和 /或用户专用参 考符号。
进一步, 所述执行单元根据所述公共参考符号进行频域调度的信道质量 测量, 以及根据所述公共参考符号和 /或用户专用参考符号对发送端发送的数 据符号解调。
一种通信系统, 包括:
发射装置, 用于在发送共享控制信令的时隙中, 根据发送共享控制信令 所需天线在该时隙中的 OFDM符号中插入公共参考符号, 以及根据所使用的 多天线技术在 OFDM符号中插入用户专用参考符号, 以及将包含所述公共参 考符号和 /或用户专用参考符号的 OFDM符号发送;
接收装置,用于接收所述 OFDM符号和从该 OFDM符号中提取所述公共 参考符号和 /或用户专用参考符号。
进一步, 所述接收装置根据提取出的公共参考符号进行频域调度的信道 质量测量, 以及根据所述公共参考符号和 /或用户专用参考符号对发送端发送 的数据符号解调。
本发明实施例有益效果如下:
本发明实施例的方案针对发送共享控制信令的天线在对应的 OFDM符号中
户专用的参考符号后, 不仅能灵活的支持多天线传输技术, 而且还能根据发 送端与接收端之间使用的多天线传输技术对参考符号和用户专用参考符号进 行灵活设置, 使接收到包含公共参考符号和用户专用参考符号的 OF腹符号的 接收端用户不仅能根据参考符号中的公共参考符号进行频域调度的信道质量 测量和解调出控制信令, 也可根据参考符号中设置的用户专用参考符号解调 出数据符号。 附图说明
图 1为现有技术空域线性变换的示意图;
图 2为现有技术 OFDM调制的系统中无线帧的一种结构示意图; 图 3为现有技术 OFDM调制的系统中无线帧的另一种结构示意图; 图 4为现有技术在 OFDM符号上设置参考符号的示意图;
图 5为现有技术在 OFDM符号上设置参考符号的另一示意图;
图 6为本发明实施例中的通信系统的示意图;
图 7为本发明实施例中发送端的处理流程图;
图 8为本发明实施例中接收端的处理流程图;
图 9为本发明实施例中在 OFDM符号上设置公共参考符号的示意图; 图 10为本发明实施例中采用开环的发射分集技术或开环的空间复用技术 时用户使用的物理资源块中的 OFDM符号上设置参考符号的示意图;
图 11为本发
OFDM符号上设置参考符号的示意图;
图 12为本发明实施例中采用波束
OFDM符号上设置参考符号的另一示意图;
图 13为本发明实施例中采用闭环的空间复用技术时用户使用的物理资源 块中的 OFDM符号上设置参考符号的示意图。 具体实施方式
为了解决现有技术中不能灵活支持频域调度和多种不同的多天线技术的 问题, 本实施例在发送共享控制信令的时隙中, 发送端根据发送共享控制信 令所需天线在该时隙中的正交频分复用 OFDM符号中插入公共参考符号; 根 据所使用的多天线技术在该时隙中的 OFDM符号中插入用户专用参考符号; 发送端发送包含所述公共参考符号和 /或用户专用参考符号的 OFDM符号。 当 接收端接收到所述 OFDM符号时,从中提取所述公共参考符号和 /或用户专用 参考符号。
参阅图 6所示, 本实施例的系统包括发送端 610和接收端 620。
发送端 610包括设置单元 6101和发送单元 6102。 设置单元 6101根据发 送控制信令所需天线设置公共参考符号, 并根据发送端与接收端之间所采用 的多天线技术设置用户专用参考符号, 以及将所述参考符号插入到 OFDM符 号中后传送给发送单元 6102。 发送单元 6102将所述 OFDM符号进行发送。
接收端 620包括接收单元 6201和执行单元 6202。 接收单元 6201用于接 收插入所述参考符号的 OFDM符号,并将接收到的所述 OFDM符号传送给执 行单元 6202。 执行单元 6202从所述 OFDM符号中读取出参考符号, 进一步 执行单元 6202还可根据所述公共参考符号进行频域调度的信道质量测量, 以 及才艮据所述用户专用参考符号对发送端发送的数据符号解调。
在 OFDM系统中采用多天线传输技术时, 发送端与接收端之间所使用的 多天线技术可根据系统的配置情况如基站天线数目、 终端天线数目、 系统的 应用场景(如满足提高数据传输速率或者提高系统覆盖范围) 等情况、 以及 用户位置 (用户位于小区中心还是小区边缘) 以及空间信道(空间信道的相 关性、 用户终端的移动速度等)等因素进行选择。 比如对于小区边缘用户, 可以使用波束赋形技术来提高系统的覆盖范围并且降低小区间的干扰; 当用 户需要提高数据传输速率, 并且空间信道相关性较低时使用空间复用技术等。
在发送共享控制信令的时隙中设置公共参考符号时, 根据传输共享控制 信令所需的天线进行公共参考符号的设置, 可以采用如下两种方式:
方式一: 对应于传输共享控制信令所需的每一根天线分别设置两组公共 参考符号插入到不同的 OFDM符号上。 如: 当传输共享控制信令所需的天线 数目为 N, 则设置公共参考符号的组数为 2N组, 对应于同一根天线的两组公 共参考符号分别插入到不同的 OFDM符号上, 采用将对应于第 n根天线的第 2n-l组和第 2n组公共参考符号分别插入到一个无线子帧或一个业务时隙的第 一个 OFDM符号上和倒数第三个 OFDM符号上的方式。第 2n-l组和第 2n组 公共参考符号在第 n根天线上进行传输。 同一组公共参考符号插入到一个 OFDM符号上的不同子载波, 并且在频域上相差的子载波数目相等。 在同一 个 OFDM符号上插入的多组公共参考符号在频域上相差固定数目的子载波 K 即相差 Q个子载波, Q的取值可为 0。
方式二: 对应于传输共享控制信令所需的每一根天线分别设置一组公共 参考符号插入到第一个 OFDM符号上。 釆用这种方式, 当发送端与接收端之 间所使用的天线技术为单天线技术、 开环发射分集技术或开环的空间复用技 术时, 对应于每一根传输共享控制信令的天线再分别设置一组用户专用参考 符号, 该用户专用参考符号插入到接收端用户占用的物理资源块中的倒数第 三个 OFDM符号上; 当发送端与接收端之间使用波束赋形技术、 闭环发射分 集技术或闭环的空间复用技术时, 则不需要再针对发送共享控制信令的天线 设置用户专用的参考符号。
当在一个时隙中不需要传输共享控制信令时, 在该时隙中不设置公共参 考付万。
以下对采用方式一进行公共参考符号设置时发送端和接收端的处理进行 说明。
参阅图 7所示, 本实施例发送端的处理过程如下:
步骤 701、 发送端在下行传输的 OFDM符号上设置公共参考符号, 对发 送共享控制信令所需的每一根传输天线分别设置两组公共参考符号, 该公共 参考符号用于系统进行频域调度时的信道质量测量、 解调共享的控制信令以 及辅助解调采用开环多天线技术(如: 开环发射分集技术, 开环空间复用技 术) 的数据符号。
步骤 702、 判断发送端与接收端之间所使用的多天线传输技术的类型, 如 果发送端与接收端之间所使用的多天线传输技术为开环的发射分集技术或开 环的空间复用技术, 则执行步骤 703; 如果发送端与接收端之间所使用的多天 线传输技术为波束赋形技术、 闭环的发射分集技术或闭环的空间复用技术, 则执行步驟 704; 发送端与接收端之间使用单天线传输, 则执行步骤 705。 步骤 703、发送端与接收端之间使用的多天线传输技术为开环的发射分集 技术或开环的空间复用技术时, 除发送传输共享控制信令的天线外, 对应于 其他每一根传输天线分别设置两组用户专用参考符号, 该两组用户专用参考 符号分别插入到用户占用物理资源块中的不同的 OFDM符号上, 然后执行步 骤 705。
步驟 704、发送端与接收端之间使用的多天线传输技术为波束赋形技术或 闭环的发射分集技术或闭环空间复用技术时, 对应于每一个发送的数据流分 别设置两组用户专用参考符号, 该两组用户专用参考符号分别插入到接收端 用户占用物理资源块中的不同的 OFDM符号上, 然后继续步骤 705。
步骤 705、 将包含有参考符号的 OFDM符号进行发送。 在进行发送时, 所插入的公共参考符号在对应的天线上进行发送。 当用户使用的多天线传输 技术为开环的发射分集技术或开环的空间复用技术时, 所插入的用户专用参 考符号在进行发送时, 在对应的天线上进行发送; 当用户使用的多天线传输 技术为波束赋形技术或闭环的发射分集技术或闭环空间复用技术时, 所插入 的用户专用参考符号先采用波束赋形技术、 闭环发射分集或闭环的空间复用 技术, 然后在所有天线上进行发送。
参阅图 8所示, 本实施例接收端的处理过程如下:
步骤 801、 接收包含有公共参考符号的 OFDM符号, 并在所述 OFDM符 号的公共参考符号位提取插入的公共参考符号。
步骤 802、 利用提取的公共参考符号进行用于频域调度的信道质量测量, 并获取下行控制信令中包含的多天线传输技术指示信息。
步骤 803、根据获得的多天线传输技术指示信息判断发送端与接收端之间 所使用的多天线传输技术, 如果发送端与接收端之间所使用的多天线传输技 术为开环的发射分集技术或者开环的空间复用技术, 则执行步驟 804; 如果发 送端与接收端之间所使用的多天线传输技术为波束赋形技术、 闭环的发射分 集技术或者闭环的空间复用技术中的一种时, 则执行步骤 806; 发送端与接收 端之间所使用单天线传输, 则执行步骤 805。
步 804、 在接收端用户使用的物理资源块中的 OFDM上的用户专用参 考符号位提取用户专用参考符号, 将提取的用户专用参考符号和步骤 801 中 提取的公共参考符号用于解调使用开环的发射分集技术或开环空间复用技术 传输的数据符号。
步 805、 直接将步骤 801中提取的公共参考符号用于解调数据符号。 步驟 806、 在接收端用户使用的物理资源块中的 OFDM符号上的用户专 用参考符号位提取用户专用参考符号, 将提取的用户专用参考符号用于解调 使用波束赋形技术、 闭环发射分集或闭环空间复用技术传输的数据符号。
当采用方式二, 接收端进行处理时, 判断出接收端用户采用的多天线技 术为单天线传输技术后, 需要从接收端用户占用的物理资源块中的倒数第三 个 OFDM上提取出对应于每一根传输共享控制信令的天线设置的用户专用参 考符号, 并将该用户专用参考符号和从第一个 OFDM符号上提取的公共参考 符号用于解调采用单天线传输的数据符号; 如果接收端用户采用的多天线技 术为开环发射分集技术或开环的空间复用技术时, 也需要从接收端用户占用 的物理资源块中的倒数第三个 OFDM上提取出对应于每一根传输共享控制信 令的天线设置的用户专用参考符号, 并将该用户专用参考符号、 公共参考符 号以及其他的用户专用参考符号用于对数据符号的解调。
接收端对没有设置公共参考符号的时隙内的接收数据进行处理, 当判断 出接收端用户采用的多天线技术为单天线传输技术、 开环发射分集技术或开 环的空间复用技术时, 在接收端用户使用的物理资源块中的 OFDM符号上的 用户专用参考符号位提取用户专用参考符号, 将提取的用户专用参考符号用 于单天线传输技术、 开环发射分集技术或开环的空间复用技术传输的数据符 号的解调。
图 9所示为采用方式一在 OFDM符号上设置公共参考符号的示意图。 当发送共享控制信令需要的天线数目 2, 发送端支持的发送天线数目为 2 时,在包含 9个 OFDM符号的一个业务时隙中,在第一个 OFDM符号和倒数 第三个 OFDM符号上共插入 4組公共参考符号, 分别为第一参考符号 R,、第 二参考符号 R2、 第三参考符号 R3、 第四参考符号 R4。 其中的第一参考符号 R,和第三参考符号 R3位于第一个 OFDM符号上, 第二参考符号 1 2和第四参 考符号 4位于倒数笫三个 OFDM符号上; 第一参考符号 1^和第二参考符号 R2在第 1天线上发送, 第三参考符号 3和第四参考符号 R4在第 2天线上发 送; 在同一个 OFDM符号上的同一组公共参考符号在频域上相差子载波数 P 为 6, 在同一个 OFDM符号上的不同组公共参考符号在频域上相差子载波数 K为 1 ,对应于同一根天线的两组公共参考符号在频域上相差子载波数 Q为 3。 OFDM符号上的其他子载波用于发送数据符号 D。
当发送端与接收端之间使用多天线传输技术为开环的发射分集技术或开 环的空间复用技术, 且发送端发送天线数与待发送的控制信令数相同时, 不 需要插入用户专用参考符号。 当发送端支持的发送天线数目 M大于发送控制 信令需要的天线数目 N 时, 需要插入用户专用参考符号, 对应于发送传输 共享控制信令的天线外的其他每一根传输天线分别设置两组用户专用参考符 号, 即插入用户专用参考符号的组数为 2 ( M - N ), 对应于同一根传输天线的 两组用户专用参考符号分别插入到不同的 OFDM符号上。 用户专用参考符号 仅在使用多天线传输技术为开环的发射分集技术或开环的空间复用技术的用 户占用的物理资源块中的 OFDM符号上插入。
图 10所示为采用开环的发射分集技术或开环的空间复用技术时接收端用 户使用的物理资源块中的 OFDM符号上设置参考符号的示意图。
发送端支持的发送天线数目 M为 2, 发送控制信令需要的发送天线数目 N为 1时, 需要插入的公共参考符号组数 2N为 2, 需要插入的用户专用参考 符号组数 2 ( M - N ) 为 2。 插入的公共参考符号分别为第一参考符号 R 第 二参考符号 R2 ; 插入的用户专用参考符号分别为用户专用的第一参考符号 AR,、 用户专用的第二参考符号 AR2。 其中, 第一参考符号 R,和用户专用的 第一参考符号 AR,位于第一个 OFDM符号上, 第二参考符号 R2和用户专用 的第二参考符号 2位于倒数第三个 OFDM符号上; 第一参考符号 和第 二参考符号 R2在笫 1天线上输出, 用户专用的第一参考符号 和用户专用 的笫二参考符号 AR2在第 2天线上输出; 在同一个 OFDM符号上的同一组参 考符号在频域上相差子载波数 P为 6, 在同一个 OFDM符号上的不同组参考 符号在频域上相差子载波数 K为 1 , 对应于同一天线的两组参考符号在频域 上相差子载波数 Q为 3。 OFDM符号上的其他子载波用于发送数据符号 D。
当发送端与接收端之间采用单天线传输技术、 开环的发射分集技术或开 环的空间复用技术时, 对应于传输共享控制信令的每一根天线分别设置一组 公共参考符号和一組用户专用参考符号的方法与图 10所示类同, 不再赘述。
当发送端与接收端之间采用多天线传输技术为波束赋形技术、 闭环发射 分集技术或闭环的空间复用技术时, 在用户所使用的物理资源块中的 OFDM 符号上插入用户专用参考符号, 对应于每一个发送的数据流分别设置两组用 户专用参考符号 ,该两组用户专用参考符号分别插入到不同的 OFDM符号上。 即当传输的数据流数目为 L (传输的流数目 L小于或等于发送端支持的发送 天线数目 M, 使用闭环发射分集技术或者波束赋形技术时 L=l , 当使用闭环 的空间复用技术时 L>1 ), 在 OFDM符号上插入的用户专用参考符号组数为 2L 組, 对应于同一个数据流 1 的两组用户专用的参考符号分别插入不同的 OFDM符号上, 其中第 21-1组位于第一个 OFDM符号上, 第 21组位于倒数 第三个 OFDM符号上。 第 21-1组和第 21组用户专用参考符号使用第 1个数据 流对应的预编码矩阵进行预编码操作, 并在所有天线上进行传输。 属于同一 组的用户专用参考符号均匀插入到同一个 OFDM符号上。在同一个 OFDM符 号上插入的多组参考符号在频域上相差固定数目的子载波 K ( K≠0 )。对应于 同一个数据流的两组用户专用参考符号在频域上进行交错放置, .即相差 Q个 子载波, Q的取值可为 0。 用户专用参考符号仅插入到使用多天线传输技术为 波束赋形技术、 闭环发射分集技术或闭环的空间复用技术的用户占用的物理 资源块中的 OFDM符号上。 图 11 所示为釆用波束赋形技术时接收端用户使用的物理资源块中的 OFDM符号上设置参考符号的示意图。
当发送端发送的共享控制信令需要的发送天线数目 N为 1 , 传输的数据 流 L为 1 , 接收端用户采用波束赋形技术时, 插入的公共参考符号组数 2N为 2,插入的用户专用参考符号组数 2L为 2。插入的公共参考符号分别为第一参 考符号 R,、第二参考符号 R2 ; 插入的用户专用的参考符号分别为用户专用的 第一参考符号 AR,、 用户专用的第二参考符号 AR2。 其中, 第一参考符号 和用户专用的第一参考符号 AR,位于第一个 OFDM符号上,第二参考符号 R2 和用户专用的第二参考符号 AR 于倒数第三个 OFDM符号上; 用户专用的 第一参考符号 和用户专用的第二参考符号 AR2在发送端的所有天线上输 出;在同一个 OFDM符号上的同一组参考符号在频域上相差子载波数 P为 6, 在同一个 OFDM符号上的不同组参考符号在频域上相差子载波数 K为 1 , 对 应于同一个数据流的两组用户专用参考符号在频域上进行交错放置, 相差子 载波数 Q为 3。 OFDM符号上的其他子载波用于发送数据符号 D。
当发送端与接收端之间采用波束赋形、 闭环发射分集技术或闭环的空间 复用技术时, 只需要在第一个 OFDM符号上的公共参考符号就能支持频域调 度和解调共享的控制信令, 这样, 发送端与接收端之间采用波束赋形、 闭环 发射分集技术或闭环的空间复用技术时, 可以采用对应于每一根传输共享控 制信令的天线分别设置一组公共参考符号, 并将该公共参考符号插入到第一 个 OFDM符号上, 而且对应于所述天线不再设置用户专用的参考符号。
图 12 所示为采用波束赋形技术时接收端用户使用的物理资源块中的 OFDM符号上设置参考符号的另一示意图。
当发送端发送的控制信令需要的发送天线数目 N为 1 , 传输的数据流 L 为 1 , 接收端用户采用波束赋形技术时, 在该用户使用的物理资源块中的 OFDM符号上, 插入公共参考符号组数 N为 1 , 插入的额外的用户专用参考 符号组数 2L为 2。 插入的公共参考符号为第一参考符号 R,; 插入的用户专用 的参考符号分别为用户专用的第一参考符号 AR,、 用户专用的第二参考符号 AR2。 其中, 第一参考符号 Rt和用户专用的笫一参考符号 位于第一个 OFDM符号上, 用户专用的第二参考符号 AR2位于第三个 OFDM符号上; 用 户专用的第一参考符号 和用户专用的第二参考符号 2在发送端的所有 天线上输出; 在同一个 OFDM符号上的同一组参考符号在频域上相差子载波 数 P为 6, 在同一个 OFDM符号上的不同组参考符号在频域上相差子载波数 K为 1 , 对应于同一数据流的两组用户专用参考符号在频域上进行交错放置, 相差子载波数 Q为 3。
图 13 所示为采用闭环的空间复用技术时用户使用的物理资源块中的 OFDM符号上设置参考符号的示意图。
采用对应于每一根传输共享控制信令的天线分别设置一组公共参考符号 的方式, 并将该公共参考符号插入到第一个 OFDM符号上, 而且对应于所述 天线不再设置用户专用的参考符号。
当发送端发送的控制信令需要的发送天线数目 N为 2, 传输的数据流 L 为 2,接收端用户釆用闭环的空间复用技术时, 在该用户使用的物理资源块中 的 OFDM符号上插入的公共参考符号組数 N为 2, 插入的用户专用参考符号 组数 2L为 4。 插入的公共参考符号分别为第一参考符号 R 第三参考符号 R3 ; 对应于数据流 1和数据流 2插入的用户专用的参考符号分别为用户专用 的第一参考符号 AR 用户专用的第二参考符号 AR2、 用户专用的第三参考 符号 AR3、 用户专用的第四参考符号 AR4。 其中, 第一参考符号 1^和第三参 考符号 R3位于第一个 OFDM符号上,用户专用的第一参考符号 和用户专 用的第三参考符号 AR3位于第二个 OFDM符号上; 用户专用的第二参考符号 AR2和用户专用的第四参考符号 A 于倒数第三个 OFDM符号上。在同一 个 OFDM符号上的同一组参考符号在频域上相差子载波数 P为 6, 在同一个 OFDM符号上的不同組参考符号在频域上相差子载波数 K为 1 , 对应于同一 数据流的两组用户专用参考符号在频域上进行交错放置, 相差子载波数 Q为 3。 OFDM符号上的其他子载波用于发送数据符号 D。
本发明实施例在 OFDM符号中插入公共参考符号, 并根据发送端与接收 端之间使用的多天线技术在 OFDM符号中插入用户专用参考符号后将该 OFDM符号发送, 使得接收端用户接收到所述 OFDM符号并从中提取公共参 考符号和用户专用参考符号, 不仅支持了频域调度技术, 同时也支持了多天 线传输技术。
上述实施例中, 所举参考符号设置为在无线帧的一个业务时隙的 OFDM 符号上进行插入, 但本发明实施例所指参考符号设置不仅局限于此, 参考符 号同样能在由多个子帧组成的无线帧的一个子帧的 OFDM上进行设置, 其方 法同理, 不再赘述。 发明的精神和范围。 这样, 倘若对本发明的这些修改和变型属于本发明权利 要求及其等同技术的范围之内, 则本发明也意图包含这些改动和变型在内。

Claims

权 利 要 求
1、一种在 OFDM系统中处理参考符号的方法, 其特征在于, 包括如下步 骤:
发送端根据发送共享控制信令所需天线, 在发送共享控制信令的时隙的 OFDM符号中插入公共参考符号;
所述发送端才艮据所使用的多天线技术在 OFDM符号中插入用户专用参考 符号;
所述发送端发送包含所述公共参考符号和 /或用户专用参考符号的 OFDM 符号, 以及接收端接收到所述 OFDM符号后从中提取所述公共参考符号和 / 或用户专用参考符号。
2、 如权利要求 1所述的方法, 其特征在于, 在发送端对发送共享控制信 令所需的每一根传输天线分别设置一组公共参考符号, 并将该公共参考符号 插入到 OFDM符号上。
3、 如权利要求 2所述的方法, 其特征在于, 当发送端与接收端之间所使 用的多天线技术为单天线传输技术、 开环发射分集技术或开环的空间复用技 术时, 在发送端对发送共享控制信令所需的每一根传输天线还分别设置一组 用户专用参考符号, 并将该用户专用参考符号插入到 OFDM符号上。
4、 如权利要求 3所述的方法, 其特征在于, 所述公共参考符号插入到一 个时隙中的所有物理资源块中的第一个 OFDM符号上, 所述用户专用参考符 号插入到接收端用户占用的物理资源块中的倒数第三个 OFDM符号上。
5、 如权利要求 4所述的方法, 其特征在于, 在同一个 OFDM符号上, 同 一组的公共参考符号均匀分布在该 OFDM符号的子载波上, 不同组的公共参 考符号在频域上相差一定数目的子载波; 同一组的用户专用符号均匀分布在 该接收端用户占用的物理资源块中的 OFDM符号的子载波上, 不同组的用户 专用符号在频域上相差一定数目的子载波。
6、 如权利要求 1所述的方法, 其特征在于, 在发送端对发送共享控制信 令所需的每一根传输天线分别设置两组公共参考符号, 该两组公共参考符号 分别插入到不同的 OFDM符号上。
7、 如权利要求 6所述的方法, 其特征在于, 两组公共参考符号分别插入 到一个时隙中的所有物理资源块中的第一个 OFDM 符号上和倒数第三个 OFDM符号上。
8、 如权利要求 7所述的方法, 其特征在于, 在同一个 OFDM符号上, 同 一组的公共参考符号均勾分布在该 OFDM符号的子载波上, 不同组的公共参 考符号在频域上相差一定数目的子载波。
9、 如权利要求 1、 3至 8任一项所述的方法, 其特征在于, 发送端与接 收端之间所使用的多天线技术为开环发射分集技术或开环的空间复用技术 时, 在发送端除发送传输共享控制信令的天线外, 对应于其他每一根传输天 线分别设置两组用户专用参考符号, 该两组用户专用参考符号分别插入到接
10、 如权利要求 9所述的方法, 其特征在于, 除发送传输共享控制信令 的天线外, 对应于其他每一根传输天线的两组用户专用参考符号分别插入到 接收端用户占用物理资源块中的第一个 OFDM符号上和倒数第三个 OFDM符 号上。
11、 如权利要求 10所述的方法, 其特征在于, 在接收端用户占用物理资 源块中的同一个 OFDM符号上, 同一组的用户专用参考符号均匀分布在该 OFDM符号的子载波上, 不同组的用户专用参考符号以及公共参考符号在频 域上相差一定数目的子载波。
12、 如权利要求 9所述的方法, 其特征在于, 在公共参考符号和用户专 用参考符号对应的天线上发送该参考符号。
13、 如权利要求 9所述的方法, 其特征在于, 接收端用户进一步根据公 共参考符号进行频域调度的信道质量测量, 以及利用公共参考符号和 /或用户 专用参考符号对发送端发送的数据符号解调。
14、 如权利要求 1、 2、 6、 7或 8所述的方法, 其特征在于, 发送端与接 收端之间所使用的多天线技术为波束赋形技术、 闭环发射分集或闭环的空间 复用技术时, 对应于每一个发送的数据流分别设置两组用户专用参考符号, 该两组用户专用参考符号分别插入到接收端用户占用物理资源块中的不同的
OFDM符号上。
15、 如权利要求 14所述的方法, 其特征在于, 对应于同一个传输流的两 组用户专用参考符号分别插入到接收端用户占用物理资源块中的第一个 OFDM符号上和倒数第三个 OFDM符号上; 或者所述用户专用参考符号分别 插入到接收端用户占用物理资源块中的第二个 OFDM符号上和倒数第三个 OFDM符号上。
16、 如权利要求 15所述的方法, 其特征在于, 在接收端用户占用物理资 源块的同一个 OFDM 符号上, 同一组的用户专用参考符号均勾分布在该 OFDM符号的子载波上, 不同组的用户专用参考符号和 /或公共参考符号在频 域上相差一定数目的子载波。
17、 如权利要求 14所述的方法, 其特征在于, 在公共参考符号对应的天 线上发送该参考符号; 釆用波束赋形技术、 闭环发射分集或闭环的空间复用 技术在所有天线上发送用户专用参考符号。
18、 如权利要求 14所述的方法, 其特征在于, 接收端用户进一步才艮据公 共参考符号进行频域调度的信道质量测量, 以及利用用户专用参考符号对发 送端发送的数据符号解调。
19、 一种 OFDM系统中的发射装置, 其特征在于, 包括:
设置单元, 用于根据发送共享控制信令所需天线, 在发送共享控制信令 的时隙的 OFDM符号中插入公共参考符号, 以及根据所使用的多天线技术在 OFDM符号中插入用户专用参考符号;
发送单元, 用于发送包含所述公共参考符号和 /或用户专用参考符号的 OFDM符号。
20、 如权利要求 19所述的装置, 其特征在于, 所述设置单元对发送共享 控制信令所需的每一根发送天线设置一組公共参考符号, 并将该公共参考符 号插入到一个时隙中的所有物理资源块中的 OFDM符号上。
21、 如权利要求 19所述的装置, 其特征在于, 所述设置单元对发送共享 控制信令所需的每一才艮发送天线分别设置两组公共参考符号, 并将该两组公
22、 如权利要求 20所述的装置, 其特征在于, 所述设置单元对应于每一 ^^艮所述发送天线还设置一组用户专用参考符号, 并将该用户专用参考符号插 入到接收端用户占用的物理资源块中的 OFDM符号上。
23、 如权利要求 19、 21或 22所述的装置, 其特征在于, 所述设置单元 对应于传输共享控制信令天线外的其他每一根传输天线分别设置两组用户专 用参考符咢, 该两組用户专用参考符号分别插入到接收端用户占用物理资源 块中的不同的 OFDM符号上。
24、 如权利要求 19、 20或 21所述的装置, 其特征在于, 所述设置单元 对应于每一个发送的数据流分别设置两组用户专用参考符号, 该两组用户专 用参考符号分别插入到接收端用户占用物理资源块中的不同的 OFDM符号 上。
25、 '一种 OFDM系统中的接收装置, 其特征在于, 包括:
接收单元, 用于接收包含公共参考符号和 /或用户专用参考符号的 OFDM 符号;
执行单元,用于从所述 OFDM符号中读取公共参考符号和 /或用户专用参 考符号。
26、 如权利要求 25所述的装置, 其特征在于, 所述执行单元进一步根据 所述公共参考符号进行频域调度的信道质量测量, 以及根据所述公共参考符 号和 /或用户专用参考符号对发送端发送的数据符号解调。
27、 一种通信系统, 其特征在于, 包括:
发射装置, 用于根据发送共享控制信令所需天线, 在发送共享控制信令 的时隙的 OFDM符号中插入公共参考符号, 以及根据所使用的多天线技术在 OFDM符号中插入用户专用参考符号, 以及将包含所述公共参考符号和 /或用 户专用参考符号的 OFDM符号发送;
接收装置,用于接收所述 OFDM符号和从该 OFDM符号中提取所述公共 参考符号和 /或用户专用参考符号。
28、 如权利要求 27所述的系统, 其特征在于, 所述接收装置进一步根据 提取出的公共参考符号进行频域调度的信道质量测量, 以及根据所述公共参 考符号和 /或用户专用参考符号对发送端发送的数据符号解调。
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