CN100589360C - Method and system for processing reference mark in OFDM system - Google Patents

Method and system for processing reference mark in OFDM system Download PDF

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Publication number
CN100589360C
CN100589360C CN200610112565A CN200610112565A CN100589360C CN 100589360 C CN100589360 C CN 100589360C CN 200610112565 A CN200610112565 A CN 200610112565A CN 200610112565 A CN200610112565 A CN 200610112565A CN 100589360 C CN100589360 C CN 100589360C
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reference symbol
symbol
user
ofdm symbol
common reference
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CN101132255A (en
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索士强
孙韶辉
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China Academy of Telecommunications Technology CATT
Datang Mobile Communications Equipment Co Ltd
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Datang Mobile Communications Equipment Co Ltd
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Priority to CN200610112565A priority Critical patent/CN100589360C/en
Priority to PCT/CN2007/002554 priority patent/WO2008025255A1/en
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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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • 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
    • H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
    • 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
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal

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

Abstract

This invention discloses a method for processing reference symbols in an OFDM system including: a sending end plugs a public reference symbol in OFDM symbols in a time slot according to antennas transmitting shared control signaling and plugs reference symbols specially used by users in the OFDM symbols based on the used multi-antenna technology to send OFDM symbols containing the public referencesymbol and reference symbols specially used by users and a receiving end receives the symbols and picks up the public and special reference symbols for users.

Description

A kind of method and system of in ofdm system, handling reference symbol
Technical field
The present invention relates to OFDM (OFDM, the Orthogonal FrequencyDivision Multiplexing) technology of the communications field, relate in particular to a kind of method and system thereof that in ofdm system, handles reference symbol.
Background technology
At present, in system based on OFDM, the relative power difference of each subcarrier that receives at receiving terminal according to different user, adopting the frequency domain dispatching technology is the frequency sub-band that different user is selected suitable transmission data, thereby makes full use of the frequency resource in the wide-band communication system.
Adopt the system of OFDM modulation on the down direction, need provide the channel quality measurement of down direction by issuing reference symbol, and carry out frequency domain dispatching according to channel quality measurements.
Simultaneously, use multiple multi-antenna transmitting transferring technology to improve the spectrum efficiency of system in the ofdm system, for example: space multiplexing technique, transmit diversity techniques, wave beam forming technology etc., transmit diversity techniques is further divided into the transmit diversity techniques and the Open-Loop Transmit Diversity technology of closed loop; Space multiplexing technique is further divided into the space multiplexing technique of closed loop and the space multiplexing technique of open loop.Wherein the space multiplexing technique of the transmit diversity techniques of closed loop and closed loop uses linear spatial domain precoding technique to realize.Different multi-antenna technologies needs different reference symbols, wherein the space multiplexing technique of the transmit diversity techniques of closed loop, closed loop and wave beam forming Technology Need use the reference symbol of user's special use, and they can use a spatial domain linear transformation to operate and describe.
Consult the schematic diagram of spatial domain shown in Figure 1 linear transformation, L data flow X forms corresponding transmission signal Y on the M root antenna by a spatial domain linear transformation operation.Represent this spatial domain linear transformation operation with a linear transformation sign indicating number matrix V, then sending signal Y can be expressed as: Y=VX, and wherein the dimension of X is Lx1, and the dimension of Y is Mx1, and the dimension of V is MxL.When sending the number L=1 of data flow, linear spatial transform operation is closed loop transmit diversity techniques or wave beam forming technology, and when L＞1, linear spatial transform operation is the space multiplexing technique of closed loop.
Figure 2 shows that a kind of structure of radio frames in the system of OFDM modulation.One wireless frame length 10ms, each frame is divided into 20 isometric subframes, and the length of each subframe is 0.5ms.This wireless frame structure goes for frequency division duplex system, also goes for tdd systems.When adopting this frame structure to carry out the operation of time division duplex, can give downlink transfer with a part of sub-frame allocation wherein.Each subframe comprises 7 or 6 OFDM symbols.
Figure 3 shows that the another kind of structure of the system wireless frame of OFDM modulation, this wireless frame structure is only applicable to tdd systems.The long 10ms of one radio frames (Radio frame), the wireless sub-frame that it is 5ms that each frame comprises two length (Radio Sub-frame), each wireless sub-frame comprises TS0～TS6 totally 7 business time-slots, and the time span of each business time-slot is 0.675ms, can comprise 9 or 8 OFDM symbols.Between business time-slot TS0 and TS1, there are descending pilot frequency time slot (DwPTS, Downlink PilotTime Slot), uplink pilot time slot (UpPTS, Uplink Pilot Time Slot) and protection time slot (GP, Guard Period).Descending time slot is transfer point DUSP to the special interval between ascending time slot, and ascending time slot is transfer point UDSP to the special interval of descending time slot.Between per two business time-slots, there is a slot time (Timeslot Interval).
In the prior art, any subframe in radio frames shown in Figure 2, insert the reference symbol of discrete distribution on two groups of frequency domains in any business time-slot in the radio frames perhaps shown in Figure 3 first and third from the bottom the OFDM symbol respectively, be called first reference symbol and second reference symbol, be used to provide the channel quality measurement of down direction, and the channel estimating of carrying out down direction.
Two groups of reference symbols inserting in Fig. 4 and the Fig. 2 of being respectively shown in Figure 5 and the radio frames shown in Figure 3 i.e. the first reference symbol R 1With the second reference symbol R 2Inserted mode.Same group of reference symbol differs P subcarrier on frequency domain, the P value is 6, the first reference symbol R 1With the second reference symbol R 2On frequency domain, be staggeredly placed.
Adopt prior art, the reference symbol that is provided with in the OFDM symbol can only be supported transmit diversity techniques, Open-Loop Spatial Multiplexing technology and the frequency domain dispatching of open loop, can not support that wave beam forming technology, closed loop transmit diversity techniques and/or the Closed-Loop Spatial Multiplexing technology in frequency domain dispatching and the multi-antenna technology used simultaneously.Existing system does not provide a kind of effective mechanism can guarantee that system can carry out different reference symbol settings according to different transmission plans flexibly yet, thereby supports frequency domain dispatching and multiple different multi-antenna technology flexibly.
Summary of the invention
The invention provides a kind of method and system of in ofdm system, handling reference symbol, in order to solve the problem that to support frequency domain dispatching and multiple different multi-antenna technology in the prior art flexibly.
The invention provides following technical scheme:
A kind of method of handling reference symbol in ofdm system comprises the steps:
In sending the time slot of sharing the control signaling, transmitting terminal inserts common reference symbol according to sending to share in the orthogonal frequency division multiplex OFDM symbol of the control required transmit antenna of signaling in this time slot;
Described transmitting terminal inserts user's dedicated reference symbol according to employed multi-antenna technology in the OFDM symbol;
Transmitting terminal sends the OFDM symbol that comprises described common reference symbol and/or user's dedicated reference symbol; And receiving terminal therefrom extracts described common reference symbol and/or user's dedicated reference symbol after receiving described OFDM symbol.
Wherein, to sending each required root transmit antenna of shared control signaling one group of common reference symbol is set respectively at transmitting terminal, and this common reference symbol is inserted on the OFDM symbol.
The multi-antenna technology that uses between transmitting terminal and the receiving terminal is during as the space multiplexing technique of single antenna transmissions technology, Open-Loop Transmit Diversity technology or open loop, to sending each required root transmit antenna of shared control signaling one group of user's dedicated reference symbol is set respectively also at transmitting terminal, and this user's dedicated reference symbol is inserted on the OFDM symbol.
Described common reference symbol is inserted on first OFDM symbol in all Physical Resource Block in the time slot, and described user's dedicated reference symbol is inserted on third from the bottom the OFDM symbol in the Physical Resource Block of receiving terminal CU.
On same OFDM symbol, same group common reference symbol is evenly distributed on the subcarrier of this OFDM symbol, and common reference symbol does not on the same group differ the subcarrier of some on frequency domain; User's dedicated reference symbol of same group is evenly distributed on the subcarrier of the OFDM symbol in the Physical Resource Block of this receiving terminal CU, and user's dedicated reference symbol does not on the same group differ the subcarrier of some on frequency domain.
Perhaps, to sending each required root transmit antenna of shared control signaling two groups of common reference symbol are set respectively at transmitting terminal, these two groups of common reference symbol are inserted into respectively on the different OFDM symbols.
Described two groups of common reference symbol be inserted into respectively on first OFDM symbol in all Physical Resource Block in the time slot and third from the bottom OFDM symbol on.
On same OFDM symbol, same group common reference symbol is evenly distributed on the subcarrier of this OFDM symbol, and common reference symbol does not on the same group differ the subcarrier of some on frequency domain.
The multi-antenna technology that uses between transmitting terminal and the receiving terminal is during as the space multiplexing technique of Open-Loop Transmit Diversity technology or open loop, share the transmit antenna of control signaling except that sending transmission at transmitting terminal, corresponding to other each root transmit antennas two groups of user's dedicated reference symbols are set respectively, these two groups of user's dedicated reference symbols are inserted into respectively on the different OFDM symbol in the receiving terminal CU Physical Resource Block.
Preferable, share the transmit antenna of control signaling except that sending transmission, corresponding to two groups of user's dedicated reference symbols of other each root transmit antennas be inserted into respectively on first OFDM symbol in the receiving terminal CU Physical Resource Block and third from the bottom OFDM symbol on.
On the same OFDM symbol in receiving terminal CU Physical Resource Block, user's dedicated reference symbol of same group is evenly distributed on the subcarrier of this OFDM symbol, and user's dedicated reference symbol on the same group and common reference symbol do not differ the subcarrier of some on frequency domain.
On the antenna of common reference symbol and user's dedicated reference symbol correspondence, send this common reference symbol and this user's dedicated reference symbol.
Further, the receiving terminal user carries out the channel quality measurement of frequency domain dispatching according to common reference symbol, and the data symbol demodulation that utilizes common reference symbol and user's dedicated reference symbol that transmitting terminal is sent.
The multi-antenna technology that uses between transmitting terminal and the receiving terminal is during as the space multiplexing technique of wave beam forming technology, Closed-Loop Transmit Diversity or closed loop, data flow corresponding to each transmission is provided with two groups of user's dedicated reference symbols respectively, and these two groups of user's dedicated reference symbols are inserted into respectively on the different OFDM symbol in the receiving terminal CU Physical Resource Block.
Preferable, corresponding to two groups of user's dedicated reference symbols of same data flow be inserted into respectively on first OFDM symbol in the receiving terminal CU Physical Resource Block and third from the bottom OFDM symbol on; Perhaps described user's dedicated reference symbol be inserted into respectively on second OFDM symbol in the receiving terminal CU Physical Resource Block and third from the bottom OFDM symbol on.
On the same OFDM symbol of receiving terminal CU Physical Resource Block, user's dedicated reference symbol of same group is evenly distributed on the subcarrier of this OFDM symbol, and user's dedicated reference symbol on the same group and/or common reference symbol do not differ the subcarrier of some on frequency domain.
On the antenna of common reference symbol correspondence, send this reference symbol; Adopt the space multiplexing technique of wave beam forming technology, Closed-Loop Transmit Diversity or closed loop on all antennas, to send user's dedicated reference symbol.
Further, the receiving terminal user carries out the channel quality measurement of frequency domain dispatching according to common reference symbol, and the data symbol demodulation that utilizes user's dedicated reference symbol that transmitting terminal is sent.
Emitter in a kind of ofdm system comprises:
The unit is set, be used at the time slot that sends shared control signaling, insert common reference symbol according to sending to share in the OFDM symbol of the control required transmitting antenna of signaling in this time slot, and in the OFDM symbol, insert user's dedicated reference symbol according to employed multi-antenna technology;
Transmitting element is used to send the OFDM symbol that comprises described common reference symbol and/or user's dedicated reference symbol.
Preferable, the described unit that is provided with is shared each required root transmitting antenna of control signaling one group of common reference symbol is set sending, and this common reference symbol is inserted on the OFDM symbol in all Physical Resource Block in the time slot.
The described unit that is provided with also is provided with on the OFDM symbol in the Physical Resource Block that one group of user's dedicated reference symbol is inserted into the receiving terminal CU corresponding to the described transmitting antenna of each root.
Perhaps, the described unit that is provided with is shared each required root transmitting antenna of control signaling two groups of common reference symbol is set respectively sending, and this common reference symbol is inserted on the different OFDM symbol in all Physical Resource Block in the time slot.
The described unit that is provided with is shared other outer each root transmit antennas of control signaling antenna corresponding to transmission two groups of user's dedicated reference symbols is set respectively, and these two groups of user's dedicated reference symbols are inserted into respectively on the different OFDM symbol in the receiving terminal CU Physical Resource Block.
The described unit that is provided with is provided with two groups of user's dedicated reference symbols respectively corresponding to the data flow of each transmission, and these two groups of user's dedicated reference symbols are inserted respectively on the different OFDM symbol in the receiving terminal CU Physical Resource Block.
Receiving system in a kind of ofdm system comprises:
Receiving element is used to receive the OFDM symbol that comprises common reference symbol and user's dedicated reference symbol;
Performance element is used for reading common reference symbol and/or user's dedicated reference symbol from described OFDM symbol.
Further, described performance element carries out the channel quality measurement of frequency domain dispatching according to described common reference symbol, and the data symbol demodulation that transmitting terminal is sent according to described common reference symbol and/or user's dedicated reference symbol.
A kind of communication system comprises:
Emitter, be used at the time slot that sends shared control signaling, insert common reference symbol according to sending to share in the OFDM symbol of the control required antenna of signaling in this time slot, and insert user's dedicated reference symbol according to employed multi-antenna technology in the OFDM symbol, and the OFDM symbol that will comprise described common reference symbol and/or user's dedicated reference symbol sends;
Receiving system is used for receiving described OFDM symbol and extracts described common reference symbol and/or user's dedicated reference symbol from this OFDM symbol.
Further, described receiving system carries out the channel quality measurement of frequency domain dispatching according to the common reference symbol that extracts, and the data symbol demodulation that transmitting terminal is sent according to described common reference symbol and/or user's dedicated reference symbol.
Beneficial effect of the present invention is as follows:
The present invention is directed to the antenna that sends shared control signaling and in the OFDM of correspondence symbol, insert common reference symbol, and after the reference symbol according to the insertion user special use in corresponding OFDM symbol of employed multi-antenna technology, can not only support the multi-antenna transmitting transferring technology flexibly, and the present invention can also be provided with reference symbol and user's dedicated reference symbol flexibly according to the multi-antenna transmitting transferring technology that uses between transmitting terminal and the receiving terminal, make the receiving terminal user who receives the OFDM symbol that comprises common reference symbol and user's dedicated reference symbol carry out the channel quality measurement of frequency domain dispatching and to demodulate the control signaling, also can access data symbol according to the user's dedicated reference symbolic solution that is provided with in the reference symbol according to the common reference symbol in the reference symbol.
Description of drawings
Fig. 1 is the schematic diagram of prior art spatial domain linear transformation;
Fig. 2 is a kind of structural representation of radio frames in the system of prior art OFDM modulation;
Fig. 3 is the another kind of structural representation of radio frames in the system of prior art OFDM modulation;
Fig. 4 is provided with the schematic diagram of reference symbol on the OFDM symbol for prior art;
Fig. 5 is provided with another schematic diagram of reference symbol on the OFDM symbol for prior art;
Fig. 6 is the schematic diagram of the communication system in the embodiment of the invention;
Fig. 7 is the process chart of transmitting terminal in the embodiment of the invention;
Fig. 8 is the process chart of receiving terminal in the embodiment of the invention;
Fig. 9 is for being provided with the schematic diagram of common reference symbol on the OFDM symbol in the embodiment of the invention;
The schematic diagram of reference symbol is set on the OFDM symbol in Figure 10 Physical Resource Block that the user uses during for the space multiplexing technique of the transmit diversity techniques that adopts open loop in the embodiment of the invention or open loop;
The schematic diagram of reference symbol is set on the OFDM symbol in the Physical Resource Block that Figure 11 user when adopting the wave beam forming technology in the embodiment of the invention uses;
Another schematic diagram of reference symbol is set on the OFDM symbol in the Physical Resource Block that Figure 12 user when adopting the wave beam forming technology in the embodiment of the invention uses;
The schematic diagram of reference symbol is set on the OFDM symbol in the Physical Resource Block that Figure 13 user when adopting the space multiplexing technique of closed loop in the embodiment of the invention uses.
Embodiment
In order to solve the problem that to support frequency domain dispatching and multiple different multi-antenna technology in the prior art flexibly, present embodiment is in sending the time slot of sharing the control signaling, and transmitting terminal inserts common reference symbol according to sending to share in the orthogonal frequency division multiplex OFDM symbol of the control required antenna of signaling in this time slot; According to inserting user's dedicated reference symbol in the OFDM symbol of employed multi-antenna technology in this time slot; Transmitting terminal sends the OFDM symbol that comprises described common reference symbol and/or user's dedicated reference symbol.When receiving terminal receives described OFDM symbol, therefrom extract described common reference symbol and/or user's dedicated reference symbol.
Consult shown in Figure 6ly, the system of present embodiment comprises transmitting terminal 610 and receiving terminal 620.
Transmitting terminal 610 comprises unit 6101 and transmitting element 6102 is set.Unit 6101 is set common reference symbol is set according to the required antenna that sends control signaling, and user's dedicated reference symbol is set, and send transmitting element 6102 to after being inserted into described reference symbol in the OFDM symbol according to the multi-antenna technology that is adopted between transmitting terminal and the receiving terminal.Transmitting element 6102 sends described OFDM symbol.
Receiving terminal 620 comprises receiving element 6201 and performance element 6202.Receiving element 6201 is used to receive the OFDM symbol that inserts described reference symbol, and the described OFDM symbol that will receive sends performance element 6202 to.Performance element 6202 reads out reference symbol from described OFDM symbol, further performance element 6202 also can carry out the channel quality measurement of frequency domain dispatching according to described common reference symbol, and according to the data symbol demodulation of described user's dedicated reference symbol to the transmitting terminal transmission.
When adopting the multi-antenna transmitting transferring technology in ofdm system, employed multi-antenna technology can be selected according to the application scenarios situations such as (improve message transmission rate or improve system ovelay range as satisfying) of the configuring condition of system such as antenna for base station number, terminal antenna number, system and customer location (user is positioned at center of housing estate or cell edge) and space channel factors such as (correlation of space channel, the translational speeds of user terminal etc.) between transmitting terminal and the receiving terminal.Such as for less than edge customer, can use the wave beam forming technology to improve the coverage of system and the interference of reduction minizone; Need improve message transmission rate for the user, and space channel correlation usage space multiplex technique etc. when low.
When in sending the time slot of sharing the control signaling, common reference symbol being set, sharing the required antenna of control signaling according to transmission and carry out the setting of common reference symbol, can adopt following dual mode:
Mode one: corresponding to each required root antenna of transmission shared control signaling two groups of common reference symbol are set respectively and are inserted on the different OFDM symbols.As: sharing the required number of antennas of control signaling when transmission is N, the group number that common reference symbol then is set is the 2N group, two groups of common reference symbol corresponding to same antenna are inserted into respectively on the different OFDM symbols, employing will corresponding to the 2n-1 of n root antenna group and 2n group common reference symbol be inserted into respectively on first OFDM symbol of a wireless sub-frame or a business time-slot with third from the bottom OFDM symbol on mode.2n-1 group and 2n group common reference symbol are transmitted on n root antenna.Same group of common reference symbol is inserted into a different sub carrier on the OFDM symbol, and differs equal number of sub carrier wave on frequency domain.Many groups common reference symbol of inserting on same OFDM symbol differs the subcarrier K (K ≠ 0) of fixed number on frequency domain.Two groups of common reference symbol transmitting on same antenna are placed at the enterprising line interlacing of frequency domain, promptly differ Q subcarrier, and the value of Q can be 0.
Mode two: corresponding to each required root antenna of transmission shared control signaling one group of common reference symbol is set respectively and is inserted on first OFDM symbol.Adopt this mode, when employed antenna technology between transmitting terminal and the receiving terminal is the space multiplexing technique of single-antenna technology, Open-Loop Transmit Diversity technology or open loop, the antenna of sharing the control signaling corresponding to the transmission of each root is provided with one group of user's dedicated reference symbol more respectively, and this user's dedicated reference symbol is inserted on third from the bottom the OFDM symbol in the Physical Resource Block of receiving terminal CU; When using the space multiplexing technique of wave beam forming technology, closed loop transmit diversity techniques or closed loop between transmitting terminal and the receiving terminal, then do not need again at sending the reference symbol that the antenna of sharing the control signaling is provided with user's special use.
When in a time slot, not needing to transmit when sharing the control signaling, common reference symbol is not set in this time slot.
Below to employing mode one carry out common reference symbol when being provided with the processing of transmitting terminal and receiving terminal describe.
Consult shown in Figure 7ly, the processing procedure of present embodiment transmitting terminal is as follows:
Step 701, transmitting terminal are provided with common reference symbol on the OFDM of downlink transfer symbol, to sending each required root transmit antenna of shared control signaling two groups of common reference symbol are set respectively, the data symbol that the channel quality measurement that this common reference symbol is used for system when carrying out frequency domain dispatching, the control signaling that demodulation is shared and aid demodulation adopt open loop multi-antenna technology (as: Open-Loop Transmit Diversity technology, Open-Loop Spatial Multiplexing technology).
The type of employed multi-antenna transmitting transferring technology between step 702, judgement transmitting terminal and the receiving terminal, if employed multi-antenna transmitting transferring technology is the transmit diversity techniques of open loop or the space multiplexing technique of open loop between transmitting terminal and the receiving terminal, then execution in step 703; If employed multi-antenna transmitting transferring technology is the transmit diversity techniques of wave beam forming technology, closed loop or the space multiplexing technique of closed loop between transmitting terminal and the receiving terminal, then execution in step 704; Use single antenna transmissions between transmitting terminal and the receiving terminal, then execution in step 705.
The multi-antenna transmitting transferring technology that uses between step 703, transmitting terminal and the receiving terminal is during as the space multiplexing technique of the transmit diversity techniques of open loop or open loop, share the antenna of control signaling except that sending transmission, corresponding to other each root transmit antennas two groups of user's dedicated reference symbols are set respectively, these two groups of user's dedicated reference symbols are inserted into respectively on the different OFDM symbol in the CU Physical Resource Block, and execution in step 705 then.
The multi-antenna transmitting transferring technology that uses between step 704, transmitting terminal and the receiving terminal is during as the transmit diversity techniques of wave beam forming technology or closed loop or Closed-Loop Spatial Multiplexing technology, data flow corresponding to each transmission is provided with two groups of user's dedicated reference symbols respectively, these two groups of user's dedicated reference symbols are inserted into respectively on the different OFDM symbol in the receiving terminal CU Physical Resource Block, continue step 705 then.
Step 705, the OFDM symbol that will include reference symbol send.When sending, the common reference symbol of being inserted sends on the antenna of correspondence.The multi-antenna transmitting transferring technology that uses as the user is during as the space multiplexing technique of the transmit diversity techniques of open loop or open loop, and the user's dedicated reference symbol that is inserted sends on the antenna of correspondence when sending; The multi-antenna transmitting transferring technology that uses as the user is during as the transmit diversity techniques of wave beam forming technology or closed loop or Closed-Loop Spatial Multiplexing technology, the user's dedicated reference symbol that is inserted adopts the space multiplexing technique of wave beam forming technology, Closed-Loop Transmit Diversity or closed loop earlier, sends on all antennas then.
Consult shown in Figure 8ly, the processing procedure of present embodiment receiving terminal is as follows:
Step 801, reception include the OFDM symbol of common reference symbol, and extract the common reference symbol of inserting in the common reference symbol position of described OFDM symbol.
The common reference symbol that step 802, utilization are extracted is used for the channel quality measurement of frequency domain dispatching, and obtains the multi-antenna transmitting transferring technology indication information that comprises in the descending control signaling.
Step 803, judge employed multi-antenna transmitting transferring technology between transmitting terminal and the receiving terminal according to the multi-antenna transmitting transferring technology indication information that obtains, if employed multi-antenna transmitting transferring technology is the transmit diversity techniques of open loop or the space multiplexing technique of open loop between transmitting terminal and the receiving terminal, then execution in step 804; If during a kind of in the transmit diversity techniques that employed multi-antenna transmitting transferring technology is wave beam forming technology, closed loop between transmitting terminal and the receiving terminal or the space multiplexing technique of closed loop, then execution in step 806; The single antenna transmissions of using between transmitting terminal and the receiving terminal, then execution in step 805.
User's dedicated reference sign bit on step 804, the OFDM in the Physical Resource Block that the receiving terminal user uses extracts user's dedicated reference symbol, the common reference symbol of extracting in the user's dedicated reference symbol that extracts and the step 801 is used for demodulation uses the transmit diversity techniques of open loop or the data symbol of Open-Loop Spatial Multiplexing technical transmission.
Step 805, direct common reference symbol with extraction in the step 801 are used for demodulating data symbols.
User's dedicated reference sign bit on step 806, the OFDM symbol in the Physical Resource Block that the receiving terminal user uses extracts user's dedicated reference symbol, and the user's dedicated reference symbol that extracts is used for the data symbol that wave beam forming technology, Closed-Loop Transmit Diversity or Closed-Loop Spatial Multiplexing technical transmission are used in demodulation.
When employing mode two, when receiving terminal is handled, after judging multi-antenna technology that the receiving terminal user adopts and being the single antenna transmissions technology, need extract user's dedicated reference symbol of sharing the antenna setting of control signaling corresponding to each root transmission by third from the bottom OFDM from the Physical Resource Block of receiving terminal CU, and be used for the data symbol that single antenna transmissions is adopted in demodulation with this user's dedicated reference symbol with from the common reference symbol that first OFDM symbol extracts; When if the multi-antenna technology that the receiving terminal user adopts is the space multiplexing technique of Open-Loop Transmit Diversity technology or open loop, also need third from the bottom OFDM from the Physical Resource Block of receiving terminal CU to extract and share user's dedicated reference symbol that the antenna of control signaling is provided with, and this user's dedicated reference symbol, common reference symbol and other user's dedicated reference symbol are used for demodulation to the data symbol corresponding to each root transmission.
Receiving terminal is handled the reception data in the time slot that common reference symbol is not set, when the multi-antenna technology of judging receiving terminal user employing is the space multiplexing technique of single antenna transmissions technology, Open-Loop Transmit Diversity technology or open loop, user's dedicated reference sign bit on the OFDM symbol in the Physical Resource Block that the receiving terminal user uses extracts user's dedicated reference symbol, the user's dedicated reference symbol that extracts is used for the demodulation of data symbol of the space multiplexing technique transmission of single antenna transmissions technology, Open-Loop Transmit Diversity technology or open loop.
Figure 9 shows that employing mode one is provided with the schematic diagram of common reference symbol on the OFDM symbol.
Share the number of antennas 2 that the control signaling needs when sending, the transmitting antenna number of transmitting terminal support is 2 o'clock, in comprising a business time-slot of 9 OFDM symbols, on first OFDM symbol and third from the bottom OFDM symbol, insert 4 groups of common reference symbol altogether, be respectively the first reference symbol R 1, the second reference symbol R 2, the 3rd reference symbol R 3, the 4th reference symbol R 4The first reference symbol R wherein 1With the 3rd reference symbol R 3Be positioned on first OFDM symbol the second reference symbol R 2With the 4th reference symbol R 4Be positioned on third from the bottom the OFDM symbol; The first reference symbol R 1With the second reference symbol R 2On the 1st antenna, send the 3rd reference symbol R 3With the 4th reference symbol R 4On the 2nd antenna, send; Same group of common reference symbol on same OFDM symbol differs sub-carrier number P on frequency domain be 6, on same OFDM symbol not on the same group common reference symbol to differ sub-carrier number K on frequency domain be 1, differing sub-carrier number Q corresponding to two groups of common reference symbol of same antenna on frequency domain is 3.Other subcarriers on the OFDM symbol are used to send data symbol D.
When using the multi-antenna transmitting transferring technology between transmitting terminal and the receiving terminal, when the transmitting terminal number of transmit antennas is identical with control signaling number to be sent, do not need to insert user's dedicated reference symbol as the space multiplexing technique of the transmit diversity techniques of open loop or open loop.When the transmitting antenna number M of transmitting terminal support when sending control signaling the number of antennas N that needs, need to insert user's dedicated reference symbol, corresponding to other outer each the root transmit antennas of antenna that send the shared control of transmission signaling two groups of user's dedicated reference symbols are set respectively, the group number that promptly inserts user's dedicated reference symbol is 2 (M-N), is inserted into respectively on the different OFDM symbols corresponding to two groups of user's dedicated reference symbols of same transmit antenna.User's dedicated reference symbol is only using the multi-antenna transmitting transferring technology to insert on as the OFDM symbol in the Physical Resource Block of the CU of the space multiplexing technique of the transmit diversity techniques of open loop or open loop.
The schematic diagram of reference symbol is set on the OFDM symbol in the Physical Resource Block that the receiving terminal user uses when Figure 10 shows that the space multiplexing technique of the transmit diversity techniques that adopts open loop or open loop.
The transmitting antenna number M of transmitting terminal support is 2, and the transmitting antenna number N that sending control signaling needs is 1 o'clock, and it is 2 that the common reference symbol group that need insert is counted 2N, and needing several 2 (M-N) of user's dedicated reference symbols that insert is 2.The common reference symbol of inserting is respectively the first reference symbol R 1, the second reference symbol R 2The user's dedicated reference symbol that inserts is respectively the first reference symbol AR of user's special use 1, user's special use the second reference symbol AR 2Wherein, the first reference symbol R 1The first reference symbol AR with user's special use 1Be positioned on first OFDM symbol the second reference symbol R 2The second reference symbol AR with user's special use 2Be positioned on third from the bottom the OFDM symbol; The first reference symbol R 1With the second reference symbol R 2On the 1st antenna, export the first reference symbol AR of user's special use 1The second reference symbol AR with user's special use 2On the 2nd antenna, export; Same group of reference symbol on same OFDM symbol differs sub-carrier number P on frequency domain be 6, on same OFDM symbol not on the same group reference symbol to differ sub-carrier number K on frequency domain be 1, differing sub-carrier number Q corresponding to two groups of reference symbols of the same antenna on frequency domain is 3.Other subcarriers on the OFDM symbol are used to send data symbol D.
When the space multiplexing technique of transmit diversity techniques that adopts single antenna transmissions technology, open loop between transmitting terminal and the receiving terminal or open loop, each root antenna of sharing the control signaling corresponding to transmission is provided with the method for one group of common reference symbol and one group of user's dedicated reference symbol and roughly the same shown in Figure 10 respectively, repeats no more.
When adopting the multi-antenna transmitting transferring technology to be the space multiplexing technique of wave beam forming technology, closed loop transmit diversity techniques or closed loop between transmitting terminal and the receiving terminal, insert user's dedicated reference symbol on the OFDM symbol in the employed Physical Resource Block of user, data flow corresponding to each transmission is provided with two groups of user's dedicated reference symbols respectively, and these two groups of user's dedicated reference symbols are inserted into respectively on the different OFDM symbols.Promptly working as the data flow transmitted number is that (the flow amount L of transmission is less than or equal to the transmitting antenna number M that transmitting terminal is supported to L, L=1 when using closed loop transmit diversity techniques or wave beam forming technology, L＞1 when using the space multiplexing technique of closed loop), the user's dedicated reference symbols number that inserts on the OFDM symbol is the 2L group, reference symbol corresponding to two groups of user's special uses of same data flow 1 is inserted respectively on the different OFDM symbols, wherein the 21-1 group is positioned on first OFDM symbol, and the 21st group is positioned on third from the bottom the OFDM symbol.21-1 group and the 21st group of user's dedicated reference symbol use the pre-coding matrix of the 1st data flow correspondence to carry out pre-encode operation, and transmit on all antennas.The user's dedicated reference symbol that belongs to same group evenly is inserted on the same OFDM symbol.Many groups reference symbol of inserting on same OFDM symbol differs the subcarrier K (K ≠ 0) of fixed number on frequency domain.Two groups of user's dedicated reference symbols corresponding to same data flow are placed at the enterprising line interlacing of frequency domain, promptly differ Q subcarrier, and the value of Q can be 0.User's dedicated reference symbol only inserts and uses the multi-antenna transmitting transferring technology as on the OFDM symbol in the Physical Resource Block of the CU of the space multiplexing technique of wave beam forming technology, closed loop transmit diversity techniques or closed loop.
Figure 11 shows that the schematic diagram that reference symbol is set on the OFDM symbol in the Physical Resource Block that the receiving terminal user uses when adopting the wave beam forming technology.
The transmitting antenna number N that the shared control signaling that sends when transmitting terminal needs is 1, and data flow transmitted L is 1, and when the receiving terminal user adopted the wave beam forming technology, it was 2 that the common reference symbol group of insertion is counted 2N, and it is 2 that user's dedicated reference symbols of insertion is counted 2L.The common reference symbol of inserting is respectively the first reference symbol R 1, the second reference symbol R 2The reference symbol of user's special use of inserting is respectively the first reference symbol AR of user's special use 1, user's special use the second reference symbol AR 2Wherein, the first reference symbol R 1The first reference symbol AR with user's special use 1Be positioned on first OFDM symbol the second reference symbol R 2The second reference symbol AR with user's special use 2Be positioned on third from the bottom the OFDM symbol; The first reference symbol AR of user's special use 1The second reference symbol AR with user's special use 2On all antennas of transmitting terminal, export; Same group of reference symbol on same OFDM symbol differs sub-carrier number P on frequency domain be 6, on same OFDM symbol not on the same group reference symbol to differ sub-carrier number K on frequency domain be 1, two groups of user's dedicated reference symbols corresponding to same data flow are placed at the enterprising line interlacing of frequency domain, and differing sub-carrier number Q is 3.Other subcarriers on the OFDM symbol are used to send data symbol D.
Between transmitting terminal and receiving terminal, adopt wave beam forming, during the space multiplexing technique of closed loop transmit diversity techniques or closed loop, only need just can support the control signaling that frequency domain dispatching and demodulation are shared in the common reference symbol on first OFDM symbol, like this, adopt wave beam forming between transmitting terminal and the receiving terminal, during the space multiplexing technique of closed loop transmit diversity techniques or closed loop, can adopt antenna that one group of common reference symbol is set respectively corresponding to the shared control of each root transmission signaling, and this common reference symbol is inserted on first OFDM symbol, and the reference symbol of user's special use is set no longer corresponding to described antenna.
Figure 12 shows that another schematic diagram that reference symbol is set on the OFDM symbol in the Physical Resource Block that the receiving terminal user uses when adopting the wave beam forming technology.
The transmitting antenna number N that the control signaling that sends when transmitting terminal needs is 1, data flow transmitted L is 1, when the receiving terminal user adopts the wave beam forming technology, on the OFDM symbol in the Physical Resource Block that this user uses, it is 1 that insertion common reference symbol group is counted N, and it is 2 that extra user's dedicated reference symbols of insertion is counted 2L.The common reference symbol of inserting is the first reference symbol R 1The reference symbol of user's special use of inserting is respectively the first reference symbol AR of user's special use 1, user's special use the second reference symbol AR 2Wherein, the first reference symbol R 1The first reference symbol AR with user's special use 1Be positioned on first OFDM symbol the second reference symbol AR of user's special use 2Be positioned on the 3rd the OFDM symbol; The first reference symbol AR of user's special use 1The second reference symbol AR with user's special use 2On all antennas of transmitting terminal, export; Same group of reference symbol on same OFDM symbol differs sub-carrier number P on frequency domain be 6, on same OFDM symbol not on the same group reference symbol to differ sub-carrier number K on frequency domain be 1, two groups of user's dedicated reference symbols corresponding to same data flow are placed at the enterprising line interlacing of frequency domain, and differing sub-carrier number Q is 3.
The schematic diagram of reference symbol is set on the OFDM symbol in the Physical Resource Block that the user uses when Figure 13 shows that the space multiplexing technique that adopts closed loop.
Employing is shared the mode that the antenna of controlling signaling is provided with one group of common reference symbol respectively corresponding to each root transmission, and this common reference symbol is inserted on first OFDM symbol, and the reference symbol of user's special use no longer is set corresponding to described antenna.
The transmitting antenna number N that the control signaling that sends when transmitting terminal needs is 2, data flow transmitted L is 2, when the receiving terminal user adopts the space multiplexing technique of closed loop, it is 2 that the common reference symbol group of inserting on the OFDM symbol in the Physical Resource Block that this user uses is counted N, and it is 4 that user's dedicated reference symbols of insertion is counted 2L.The common reference symbol of inserting is respectively the first reference symbol R 1, the 3rd reference symbol R 3The reference symbol of user's special use of inserting corresponding to data flow 1 and data flow 2 is respectively the first reference symbol AR of user's special use 1, user's special use the second reference symbol AR 2, user's special use the 3rd reference symbol AR 3, user's special use the 4th reference symbol AR 4Wherein, the first reference symbol R 1With the 3rd reference symbol R 3Be positioned on first OFDM symbol the first reference symbol AR of user's special use 1The 3rd reference symbol AR with user's special use 3Be positioned on second OFDM symbol; The second reference symbol AR of user's special use 2The 4th reference symbol AR with user's special use 4Be positioned on third from the bottom the OFDM symbol.Same group of reference symbol on same OFDM symbol differs sub-carrier number P on frequency domain be 6, on same OFDM symbol not on the same group reference symbol to differ sub-carrier number K on frequency domain be 1, two groups of user's dedicated reference symbols corresponding to same data flow are placed at the enterprising line interlacing of frequency domain, and differing sub-carrier number Q is 3.Other subcarriers on the OFDM symbol are used to send data symbol D.
The present invention inserts common reference symbol in the OFDM symbol, and in the OFDM symbol, insert behind user's dedicated reference symbol according to the multi-antenna technology that uses between transmitting terminal and the receiving terminal this OFDM symbol is sent, make the receiving terminal user receive described OFDM symbol and also therefrom extract common reference symbol and user's dedicated reference symbol, not only support the frequency domain dispatching technology, also supported the multi-antenna transmitting transferring technology simultaneously.
In the foregoing description, the reference symbol of lifting is set to insert on the OFDM symbol of a business time-slot of radio frames, but indication reference symbol of the present invention setting not only is confined to this, reference symbol can be provided with on the OFDM of a subframe of the radio frames of being made up of a plurality of subframes equally, its method in like manner repeats no more.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.

Claims (28)

1, a kind of method of handling reference symbol in ofdm system is characterized in that, comprises the steps:
In sending the time slot of sharing the control signaling, transmitting terminal inserts common reference symbol according to sending to share in the orthogonal frequency division multiplex OFDM symbol of the control required transmit antenna of signaling in this time slot;
Described transmitting terminal inserts user's dedicated reference symbol according to employed multi-antenna technology in the OFDM symbol;
Described transmitting terminal sends the OFDM symbol that comprises described common reference symbol and/or user's dedicated reference symbol, and receiving terminal therefrom extracts described common reference symbol and/or user's dedicated reference symbol after receiving described OFDM symbol.
2, the method for claim 1 is characterized in that, to sending each required root transmit antenna of shared control signaling one group of common reference symbol is set respectively at transmitting terminal, and this common reference symbol is inserted on the OFDM symbol.
3, method as claimed in claim 2, it is characterized in that, when employed multi-antenna technology between transmitting terminal and the receiving terminal is the space multiplexing technique of single antenna transmissions technology, Open-Loop Transmit Diversity technology or open loop, to sending each required root transmit antenna of shared control signaling one group of user's dedicated reference symbol is set respectively also at transmitting terminal, and this user's dedicated reference symbol is inserted on the OFDM symbol.
4, method as claimed in claim 3, it is characterized in that, described common reference symbol is inserted on first OFDM symbol in all Physical Resource Block in the time slot, and described user's dedicated reference symbol is inserted on third from the bottom the OFDM symbol in the Physical Resource Block of receiving terminal CU.
5, method as claimed in claim 4 is characterized in that, on same OFDM symbol, same group common reference symbol is evenly distributed on the subcarrier of this OFDM symbol, and common reference symbol does not on the same group differ the subcarrier of some on frequency domain; User's dedicated reference symbol of same group is evenly distributed on the subcarrier of the OFDM symbol in the Physical Resource Block of this receiving terminal CU, and user's dedicated reference symbol does not on the same group differ the subcarrier of some on frequency domain.
6, the method for claim 1 is characterized in that, to sending each required root transmit antenna of shared control signaling two groups of common reference symbol is set respectively at transmitting terminal, and these two groups of common reference symbol are inserted into respectively on the different OFDM symbols.
7, method as claimed in claim 6 is characterized in that, two groups of common reference symbol be inserted into respectively on first OFDM symbol in all Physical Resource Block in the time slot and third from the bottom OFDM symbol on.
8, method as claimed in claim 7 is characterized in that, on same OFDM symbol, same group common reference symbol is evenly distributed on the subcarrier of this OFDM symbol, and common reference symbol does not on the same group differ the subcarrier of some on frequency domain.
9, as claim 1,3 to 8 each described methods, it is characterized in that, when employed multi-antenna technology is the space multiplexing technique of Open-Loop Transmit Diversity technology or open loop between transmitting terminal and the receiving terminal, share the transmit antenna of control signaling except that sending transmission at transmitting terminal, corresponding to other each root transmit antennas two groups of user's dedicated reference symbols are set respectively, these two groups of user's dedicated reference symbols are inserted into respectively on the different OFDM symbol in the receiving terminal CU Physical Resource Block.
10, method as claimed in claim 9, it is characterized in that, share the transmit antenna of control signaling except that sending transmission, corresponding to two groups of user's dedicated reference symbols of other each root transmit antennas be inserted into respectively on first OFDM symbol in the receiving terminal CU Physical Resource Block and third from the bottom OFDM symbol on.
11, method as claimed in claim 10, it is characterized in that, on the same OFDM symbol in receiving terminal CU Physical Resource Block, user's dedicated reference symbol of same group is evenly distributed on the subcarrier of this OFDM symbol, and user's dedicated reference symbol on the same group and common reference symbol do not differ the subcarrier of some on frequency domain.
12, method as claimed in claim 9 is characterized in that, sends this common reference symbol and this user's dedicated reference symbol on the antenna of common reference symbol and user's dedicated reference symbol correspondence.
13, method as claimed in claim 9, it is characterized in that, the receiving terminal user further carries out the channel quality measurement of frequency domain dispatching according to common reference symbol, and the data symbol demodulation that utilizes common reference symbol and/or user's dedicated reference symbol that transmitting terminal is sent.
14, as claim 1,2,6,7 or 8 described methods, it is characterized in that, when employed multi-antenna technology is the space multiplexing technique of wave beam forming technology, Closed-Loop Transmit Diversity or closed loop between transmitting terminal and the receiving terminal, data flow corresponding to each transmission is provided with two groups of user's dedicated reference symbols respectively, and these two groups of user's dedicated reference symbols are inserted into respectively on the different OFDM symbol in the receiving terminal CU Physical Resource Block.
15, method as claimed in claim 14 is characterized in that, corresponding to two groups of user's dedicated reference symbols of same data flow be inserted into respectively on first OFDM symbol in the receiving terminal CU Physical Resource Block and third from the bottom OFDM symbol on; Perhaps described user's dedicated reference symbol be inserted into respectively on second OFDM symbol in the receiving terminal CU Physical Resource Block and third from the bottom OFDM symbol on.
16, method as claimed in claim 15, it is characterized in that, on the same OFDM symbol of receiving terminal CU Physical Resource Block, user's dedicated reference symbol of same group is evenly distributed on the subcarrier of this OFDM symbol, and user's dedicated reference symbol on the same group and/or common reference symbol do not differ the subcarrier of some on frequency domain.
17, method as claimed in claim 14 is characterized in that, sends this reference symbol on the antenna of common reference symbol correspondence; Adopt the space multiplexing technique of wave beam forming technology, Closed-Loop Transmit Diversity or closed loop on all antennas, to send user's dedicated reference symbol.
18, method as claimed in claim 14 is characterized in that, the receiving terminal user further carries out the channel quality measurement of frequency domain dispatching according to common reference symbol, and the data symbol demodulation that utilizes user's dedicated reference symbol that transmitting terminal is sent.
19, the emitter in a kind of ofdm system is characterized in that, comprising:
The unit is set, be used at the time slot that sends shared control signaling, insert common reference symbol according to sending to share in the OFDM symbol of the control required transmitting antenna of signaling in this time slot, and in the OFDM symbol, insert user's dedicated reference symbol according to employed multi-antenna technology;
Transmitting element is used to send the OFDM symbol that comprises described common reference symbol and/or user's dedicated reference symbol.
20, device as claimed in claim 19, it is characterized in that, the described unit that is provided with is shared each required root transmitting antenna of control signaling one group of common reference symbol is set sending, and this common reference symbol is inserted on the OFDM symbol in all Physical Resource Block in the time slot.
21, device as claimed in claim 19, it is characterized in that, the described unit that is provided with is shared each required root transmitting antenna of control signaling two groups of common reference symbol is set respectively sending, and these two groups of common reference symbol are inserted on the different OFDM symbol in all Physical Resource Block in the time slot.
22, device as claimed in claim 20, it is characterized in that, the described unit that is provided with also is provided with one group of user's dedicated reference symbol corresponding to the described transmitting antenna of each root, and this user's dedicated reference symbol is inserted on the OFDM symbol in the Physical Resource Block of receiving terminal CU.
23, as claim 19,21 or 22 described devices, it is characterized in that, the described unit that is provided with is shared other outer each root transmitting antennas of control signaling antenna corresponding to transmission two groups of user's dedicated reference symbols is set respectively, and these two groups of user's dedicated reference symbols are inserted into respectively on the different OFDM symbol in the receiving terminal CU Physical Resource Block.
24, as claim 19,20 or 21 described devices, it is characterized in that, the described unit that is provided with is provided with two groups of user's dedicated reference symbols respectively corresponding to the data flow of each transmission, and these two groups of user's dedicated reference symbols are inserted into respectively on the different OFDM symbol in the receiving terminal CU Physical Resource Block.
25, the receiving system in a kind of ofdm system is characterized in that, comprising:
Receiving element is used to receive the OFDM symbol that comprises common reference symbol and/or user's dedicated reference symbol;
Performance element is used for reading common reference symbol and/or user's dedicated reference symbol from described OFDM symbol.
26, device as claimed in claim 25, it is characterized in that, described performance element further carries out the channel quality measurement of frequency domain dispatching according to described common reference symbol, and the data symbol demodulation that transmitting terminal is sent according to described common reference symbol and/or user's dedicated reference symbol.
27, a kind of communication system is characterized in that, comprising:
Emitter, be used at the time slot that sends shared control signaling, insert common reference symbol according to sending to share in the OFDM symbol of the control required antenna of signaling in this time slot, and insert user's dedicated reference symbol according to employed multi-antenna technology in the OFDM symbol, and the OFDM symbol that will comprise described common reference symbol and/or user's dedicated reference symbol sends;
Receiving system is used for receiving described OFDM symbol and extracts described common reference symbol and/or user's dedicated reference symbol from this OFDM symbol.
28, system as claimed in claim 27, it is characterized in that, described receiving system further carries out the channel quality measurement of frequency domain dispatching according to the common reference symbol that extracts, and the data symbol demodulation that transmitting terminal is sent according to described common reference symbol and/or user's dedicated reference symbol.
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