CN108631834B - Method and device for transmitting diversity in multi-antenna communication system - Google Patents

Method and device for transmitting diversity in multi-antenna communication system Download PDF

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CN108631834B
CN108631834B CN201710183586.3A CN201710183586A CN108631834B CN 108631834 B CN108631834 B CN 108631834B CN 201710183586 A CN201710183586 A CN 201710183586A CN 108631834 B CN108631834 B CN 108631834B
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CN108631834A (en
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赵锐
潘学明
苏昕
彭莹
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China Academy of Telecommunications Technology CATT
Datang Mobile Communications Equipment Co Ltd
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China Academy of Telecommunications Technology CATT
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks

Abstract

The invention provides a method and a device for transmitting diversity in a multi-antenna communication system, wherein the method comprises the following steps: determining data information of data to be sent and a sending subframe of the data to be sent; dividing the sending subframe into a plurality of precoding sub-blocks on a time domain according to Orthogonal Frequency Division Multiplexing (OFDM) symbols in the sending subframe; wherein one precoded sub-block comprises at least one first OFDM symbol occupied by a pilot symbol; respectively carrying out precoding operation on a first OFDM symbol and a second OFDM symbol occupied by data information of the plurality of precoding sub-blocks, and sending the data information after the precoding operation through the antenna port; according to the embodiment of the invention, the OFDM symbols in the transmission sub-frame are divided into the plurality of pre-coding sub-blocks, and each pre-coding sub-block is subjected to pre-coding operation, so that one data to be transmitted is subjected to multi-time pre-coding processing, and the antenna transmission diversity and pre-coding gain are improved.

Description

Method and device for transmitting diversity in multi-antenna communication system
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for transmit diversity in a multi-antenna communication system.
Background
In the LTE Rel-14V 2X technology, when transmitting data, a terminal UE includes two channels, one control channel PSCCH for transmitting Scheduling Assignment information (SA); another Data channel PSSCH for transmitting Data information (Data). The receiving end firstly receives the data information according to the received control information by detecting the SA information carried in the control channel.
In the LTE Rel-14V 2X technology, there are two modes of resource selection:
one is a mode of selecting resources autonomously by the terminal UE, and the UE selects free resources by a sensing method in a V2X resource pool configured or preconfigured by the system; the other method is a resource selection method assisted by the base station, when the vehicle is in the network coverage, the base station can schedule the V2V communication through a downlink control channel (PDCCH/EPDCCH), and in this case, the base station indicates the resource position of the SA and Data transmitted by the transmitting vehicle by transmitting a V2V grant (V2V grant message).
The structure of the sub-frame in LTE Rel-14V 2X is shown in fig. 1, and includes 14 OFDM (Orthogonal Frequency Division Multiplexing) symbols; the 4 OFDM symbols are used for carrying pilot symbols, that is, demodulation reference signals DMRSs; a Guard interval (GP, Guard Period) is carried by 1 OFDM symbol user; and the first OFDM symbol may be used for automatic gain control AGC adjustment.
DMRS generation for SA and Data for LTE Rel-14V 2X mainly involves the following ways:
the DMRS sequence adopted by the scheduling assignment information SA adopts a predefined initialization ID and one of predefined 4 cyclic shifts {0,3,6,9}, and the receiving end needs to blindly detect the cyclic shift of the DMRS used by the SA when accepting the SA. DMRS sequences on OFDM symbols of different DMRSs are the same.
The DMRS initialization ID and the cyclic shift of the DMRS sequence used by the Data information Data are generated by an ID value (N _ ID) obtained by Cyclic Redundancy Check (CRC) bits of the SA, and may be different on OFDM symbols of different DMRSs, and when N _ ID mod 2 is 0, the DMRS sequence is the same, and when N _ ID mod 2 is 1, the DMRS sequence is different and is extended by [1, -1,1, -1 ]. The receiving end can completely reconstruct the DMRS sequence of the whole data transmission according to the received SA information.
However, the conventional LTE Rel-14V 2X system only supports a single-antenna transmission method in a link for direct communication between terminal UEs, and with the development of multi-antenna technology, the single-antenna transmission method cannot be applied to a multi-antenna mode.
Disclosure of Invention
The invention aims to provide a method and a device for transmitting diversity in a multi-antenna communication system, which solve the problem that a single-antenna data transmission mode in the prior art cannot be applied to the multi-antenna communication system.
In order to achieve the above object, an embodiment of the present invention provides a method for transmit diversity in a multi-antenna communication system, where the multi-antenna communication system includes an antenna port, and the method includes:
determining data information of data to be sent and a sending subframe of the data to be sent;
dividing the sending subframe into a plurality of precoding sub-blocks on a time domain according to Orthogonal Frequency Division Multiplexing (OFDM) symbols in the sending subframe; wherein one precoded sub-block comprises at least one first OFDM symbol occupied by a pilot symbol;
respectively carrying out precoding operation on a first OFDM symbol and a second OFDM symbol occupied by data information of the plurality of precoding sub-blocks, and sending the data information after the precoding operation through the antenna port; and precoding the first OFDM symbol and the second OFDM symbol in the same precoding sub-block to be the same precoding operation.
The step of performing precoding operation on the first OFDM symbols of the plurality of precoded sub-blocks and the second OFDM symbols occupied by the data information to obtain data to be transmitted includes:
randomly selecting a precoding matrix for each precoding sub-block from a preset precoding matrix set; or the plurality of precoding sub-blocks select a precoding matrix per se from a preset precoding matrix set according to a predetermined sequence;
and respectively carrying out precoding operation on the first OFDM symbol and the second OFDM symbol in the precoded sub-block by using the selected precoding matrix.
Wherein before the dividing the transmission subframe into a plurality of precoded sub-blocks in a time domain according to the orthogonal frequency division multiplexing, OFDM, symbols in the transmission subframe, the method further comprises:
splitting the first OFDM symbol occupied by the pilot symbol into a plurality of first sub-OFDM symbols;
the step of dividing the transmission subframe into a plurality of precoding sub-blocks in a time domain according to the Orthogonal Frequency Division Multiplexing (OFDM) symbol in the transmission subframe includes:
dividing the transmission subframe into a plurality of precoding sub-blocks in a time domain according to a first sub-OFDM symbol and a second OFDM symbol in the transmission subframe; wherein one precoded sub-block comprises at least one first sub-OFDM symbol.
Wherein before the dividing the transmission subframe into a plurality of precoded sub-blocks in a time domain according to the orthogonal frequency division multiplexing, OFDM, symbols in the transmission subframe, the method further comprises:
splitting the second OFDM symbol occupied by the data information into a plurality of second sub-OFDM symbols;
the step of dividing the transmission subframe into a plurality of precoding sub-blocks in a time domain according to the Orthogonal Frequency Division Multiplexing (OFDM) symbol in the transmission subframe includes:
dividing the transmission subframe into a plurality of precoding sub-blocks in a time domain according to a first OFDM symbol and a second OFDM symbol in the transmission subframe; wherein one precoded sub-block comprises at least one first OFDM symbol.
Wherein before the dividing the transmission subframe into a plurality of precoded sub-blocks in a time domain according to the orthogonal frequency division multiplexing, OFDM, symbols in the transmission subframe, the method further comprises:
splitting the first OFDM symbol occupied by the pilot symbol into a plurality of first sub-OFDM symbols, and splitting the second OFDM symbol occupied by the data information into a plurality of second sub-OFDM symbols;
the step of dividing the transmission subframe into a plurality of precoding sub-blocks in a time domain according to the Orthogonal Frequency Division Multiplexing (OFDM) symbol in the transmission subframe includes:
dividing the transmission subframe into a plurality of precoding sub-blocks in a time domain according to a first sub-OFDM symbol and a second sub-OFDM symbol in the transmission subframe; wherein one precoded sub-block comprises at least one first sub-OFDM symbol.
Wherein, when the transmission subframe is a short subframe,
after dividing the transmission subframe into a plurality of precoded sub-blocks in the time domain according to orthogonal frequency division multiplexing, OFDM, symbols in the transmission subframe, the method further comprises:
determining scheduling distribution information of data to be sent;
respectively carrying out precoding operation on a first OFDM symbol and a third OFDM symbol occupied by scheduling allocation information of the plurality of precoding sub-blocks, and sending the scheduling allocation information after the precoding operation through the antenna port; and precoding the first OFDM symbol and the third OFDM symbol in the same precoding sub-block to be the same precoding operation.
An embodiment of the present invention further provides a device for transmit diversity in a multi-antenna communication system, where the multi-antenna communication system includes an antenna port, and the device includes:
the first information determining module is used for determining data information of data to be sent and sending subframes of the data to be sent;
a dividing module, configured to divide the transmission subframe into a plurality of precoding sub-blocks in a time domain according to an Orthogonal Frequency Division Multiplexing (OFDM) symbol in the transmission subframe; wherein one precoded sub-block comprises at least one first OFDM symbol occupied by a pilot symbol;
the first precoding module is used for respectively carrying out precoding operation on a first OFDM symbol and a second OFDM symbol occupied by data information of the plurality of precoding sub-blocks, and sending the data information after the precoding operation through the antenna port; and precoding the first OFDM symbol and the second OFDM symbol in the same precoding sub-block to be the same precoding operation.
Wherein the first precoding module comprises:
the matrix determination submodule is used for randomly selecting a precoding matrix for each precoding subblock from a preset precoding matrix set; or the plurality of precoding sub-blocks select a precoding matrix per se from a preset precoding matrix set according to a predetermined sequence;
and the precoding submodule is used for carrying out precoding operation on the first OFDM symbol and the second OFDM symbol in the precoding subblock by utilizing the selected precoding matrix.
Wherein the apparatus further comprises:
a first splitting module, configured to split the first OFDM symbol occupied by the pilot symbol into a plurality of first sub-OFDM symbols;
the dividing module includes:
a first dividing module, configured to divide the transmission subframe into a plurality of precoded sub-blocks in a time domain according to a first sub-OFDM symbol and a second OFDM symbol in the transmission subframe; wherein one precoded sub-block comprises at least one first sub-OFDM symbol.
Wherein the apparatus further comprises:
a second splitting module, configured to split the second OFDM symbol occupied by the data information into a plurality of second sub-OFDM symbols;
the dividing module includes:
the second division submodule is used for dividing the sending subframe into a plurality of precoding subblocks in a time domain according to the first OFDM symbol and the second OFDM symbol in the sending subframe; wherein one precoded sub-block comprises at least one first OFDM symbol.
Wherein the apparatus further comprises:
a third splitting module, configured to split the first OFDM symbol occupied by the pilot symbol into a plurality of first sub-OFDM symbols, and split the second OFDM symbol occupied by the data information into a plurality of second sub-OFDM symbols;
the dividing module includes:
the third division submodule is used for dividing the sending subframe into a plurality of precoding subblocks in a time domain according to the first sub-OFDM symbol and the second sub-OFDM symbol in the sending subframe; wherein one precoded sub-block comprises at least one first sub-OFDM symbol.
Wherein the apparatus further comprises:
the second information determining module is used for determining scheduling distribution information of data to be sent when the sending subframe is a short subframe;
the second precoding module is used for respectively carrying out precoding operation on the first OFDM symbols of the plurality of precoding sub-blocks and the third OFDM symbols occupied by the scheduling distribution information, and sending the scheduling distribution information after the precoding operation through the antenna port; and precoding the first OFDM symbol and the third OFDM symbol in the same precoding sub-block to be the same precoding operation.
The technical scheme of the invention at least has the following beneficial effects:
in the method and the device for transmitting diversity in the multi-antenna communication system of the embodiment of the invention, the OFDM symbols in the transmission sub-frame are divided into a plurality of pre-coding sub-blocks, and each pre-coding sub-block is respectively subjected to pre-coding operation, so that one data to be transmitted can be subjected to multi-pre-coding processing, and the antenna transmission diversity and pre-coding gain are improved.
Drawings
Fig. 1 is a schematic diagram illustrating a structure of a normal subframe in the prior art;
fig. 2 is a flow chart illustrating steps of a method for transmit diversity in a multi-antenna communication system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a structure of a transmission subframe according to an embodiment of the present invention;
fig. 4 is a second schematic diagram illustrating a structure of a transmission subframe according to an embodiment of the invention;
fig. 5 is a third schematic diagram illustrating a structure of a transmission subframe according to an embodiment of the present invention;
fig. 6 is a diagram illustrating a structure of a transmission subframe according to an embodiment of the present invention;
fig. 7 shows a fifth schematic diagram of a transmitting subframe according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram illustrating a transmission subframe is a short subframe according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of an apparatus for transmit diversity in a multi-antenna communication system according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of an apparatus for transmit diversity in a multi-antenna communication system according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
As shown in fig. 2, an embodiment of the present invention provides a method for transmit diversity in a multi-antenna communication system, where the multi-antenna communication system includes an antenna port, and the method includes:
step 21, determining data information of data to be sent and a sending subframe of the data to be sent;
step 22, dividing the transmission subframe into a plurality of precoding sub-blocks in a time domain according to the Orthogonal Frequency Division Multiplexing (OFDM) symbol in the transmission subframe; wherein one precoded sub-block comprises at least one first OFDM symbol occupied by a pilot symbol; as shown in fig. 3, which is a schematic structural diagram of a transmission subframe, according to fig. 3, the transmission subframe may be divided into 4 precoding sub-blocks;
step 23, performing precoding operation on the first OFDM symbols of the plurality of precoding sub-blocks and the second OFDM symbols occupied by the data information, and sending the data information after the precoding operation through the antenna port; and precoding the first OFDM symbol and the second OFDM symbol in the same precoding sub-block to be the same precoding operation.
The method for transmitting diversity in the multi-antenna communication system provided by the embodiment of the invention is generally applied to a direct communication link between terminals (or vehicles). A terminal sends data information of data to be sent and simultaneously needs to send scheduling allocation information (namely SA information) of the data to be sent; the scheduling assignment information is transmitted in a non-precoding manner (i.e., transmitted according to the scheme of the prior art), and other terminals can monitor corresponding SA information; it should be noted that the sending time of the SA information of the same data to be sent needs to be no later than the sending time of the data information data of the data to be sent.
As shown in fig. 4, which is a schematic structural diagram of a common transmission subframe, a subcarrier bandwidth is 15KHz, and the transmission subframe includes 4 pilot symbols (that is, includes 4 first OFDM symbols), so that the transmission subframe can be divided into 4 precoded sub-blocks in a time domain; the same precoding operation is performed on the first OFDM symbol of the pilot and the second OFDM symbol of the data in the 4 precoded sub-blocks in fig. 3, so that the data information of one to-be-transmitted data is precoded 4 times, and the diversity gain is improved.
Specifically, in the foregoing embodiment of the present invention, step 22 includes:
randomly selecting a precoding matrix for each precoding sub-block from a preset precoding matrix set; or the plurality of precoding sub-blocks select a precoding matrix per se from a preset precoding matrix set according to a predetermined sequence; if the multi-antenna communication system of the present application includes two antennas, the precoding matrix included in the preset precoding matrix set may include, but is not limited to, the following matrices:
Figure BDA0001254230380000071
and respectively carrying out precoding operation on the first OFDM symbol and the second OFDM symbol in the precoded sub-block by using the selected precoding matrix. Namely, the first OFDM symbol and the second OFDM symbol in the precoded subblock are precoded by using any one of the 6 matrices.
Further, the above-described embodiments of the present invention introduce a larger subcarrier bandwidth by splitting the OFDM symbol into a plurality of OFDM symbols; for example, in the case of introducing a sub-carrier bandwidth of 30KHz, one OFDM symbol is split into two sub-OFDM symbols. Three splitting schemes are provided in the examples of the present invention.
In the first scheme, before step 22, the embodiment of the present invention further includes:
step 201, splitting the first OFDM symbol occupied by the pilot symbol into a plurality of first sub-OFDM symbols;
step 22 then comprises: dividing the transmission subframe into a plurality of precoding sub-blocks in a time domain according to a first sub-OFDM symbol and a second OFDM symbol in the transmission subframe; wherein one precoded sub-block comprises at least one first sub-OFDM symbol.
As shown in fig. 5, the first OFDM symbol of the pilot is split into 2 first sub-OFDM symbols, and the second OFDM symbol of the data is not split, in this case, the transmission subframe may be divided into 8 precoding sub-blocks at most, so that 8 independent precoding operations may be performed on the data information of the data to be transmitted, thereby further improving the diversity gain.
It should be noted that the pilot sequences of the 2 first sub-OFDM symbols obtained by splitting one first OFDM symbol may be the same or different, and the generation of the pilot sequences may be determined by the SA information indication.
In a second scheme, before step 22, the embodiment of the present invention further includes:
step 202, splitting the second OFDM symbol occupied by the data information into a plurality of second sub-OFDM symbols;
step 22 then comprises:
dividing the transmission subframe into a plurality of precoding sub-blocks in a time domain according to a first OFDM symbol and a second OFDM symbol in the transmission subframe; wherein one precoded sub-block comprises at least one first OFDM symbol.
As shown in fig. 6, the second OFDM symbol of the data is split into 2 second sub-OFDM symbols, and the first OFDM symbol of the pilot is not subjected to symbol splitting, in this case, the transmission subframe may be divided into 4 precoding matrices at most, so that 4 independent precoding operations may be performed on the data information of the data to be transmitted. Because the second OFDM symbol of the data is split, finer time domain resource granularity can be provided; meanwhile, the first OFDM symbol of the transmitted subframe is generally used as an automatic gain control AGC, the last OFDM symbol is generally used as a guard interval GP, and since the first OFDM symbol and the last OFDM symbol are both split, the split first sub-OFDM symbol can be used as the AGC, and the split last sub-OFDM symbol can be used as the GP, thereby reducing the overhead of the AGC and the GP.
In a third aspect, before step 22, the embodiment of the present invention further includes:
step 203, splitting the first OFDM symbol occupied by the pilot symbol into a plurality of first sub-OFDM symbols, and splitting the second OFDM symbol occupied by the data information into a plurality of second sub-OFDM symbols;
step 22 then comprises:
dividing the transmission subframe into a plurality of precoding sub-blocks in a time domain according to a first sub-OFDM symbol and a second sub-OFDM symbol in the transmission subframe; wherein one precoded sub-block comprises at least one first sub-OFDM symbol.
As shown in fig. 7, in this scheme, not only the first OFDM symbol of the pilot is split into 2 first sub-OFDM symbols, but also the second OFDM symbol of the data is split into 2 second sub-OFDM symbols, at this time, the transmission subframe may be divided into 8 precoding sub-blocks at most, so that 8 independent precoding operations may be performed on the data information of the data to be transmitted, and the diversity gain is further improved; because the second OFDM symbol of the data is split, finer time domain resource granularity can be provided; meanwhile, the first OFDM symbol of the transmitted subframe is generally used as an automatic gain control AGC, the last OFDM symbol is generally used as a guard interval GP, and since the first OFDM symbol and the last OFDM symbol are both split, the split first sub-OFDM symbol can be used as the AGC, and the split last sub-OFDM symbol can be used as the GP, thereby reducing the overhead of the AGC and the GP.
Further, when the transmission subframe is a short subframe, for example, a slot-level TTI or a short subframe is formed by several OFDM symbols, the method provided in the embodiment of the present invention further includes:
step 24, determining scheduling distribution information of data to be sent;
step 25, performing precoding operation on the first OFDM symbol and the third OFDM symbol occupied by the scheduling assignment information of the plurality of precoded sub-blocks, respectively, and sending the scheduling assignment information after the precoding operation through the antenna port; and precoding the first OFDM symbol and the third OFDM symbol in the same precoding sub-block to be the same precoding operation.
In the above embodiments of the present invention, the SA information may be sent not only according to the existing transmission scheme, but also in a precoding operation manner. Specifically, the third OFDM symbol occupied by the scheduling assignment information and the first OFDM symbol occupied by the pilot frequency in the 4 precoding sub-blocks in fig. 8 are respectively precoded and then transmitted through the antenna port, so that the scheduling assignment information is precoded 4 times, and the diversity gain is improved. Specifically, as shown in fig. 8, in the case of a short subframe, the terminal performs transmission of the SA and data with reference to the short subframe, where a pilot sequence of the SA is generated by using a predefined sequence (including predefined DMRS initialization ID and cyclic shift information of a demodulation reference signal), and a pilot sequence of the data information may generate a DMRS sequence according to an indication of the SA.
In summary, the transmit diversity method provided in the above embodiment of the present invention divides the OFDM symbols in the transmission subframe into a plurality of precoding sub-blocks, and performs precoding operation on each precoding sub-block, so that one data to be transmitted is subjected to multiple precoding processes, thereby improving antenna transmit diversity and precoding gains; and the number of the pre-coding sub-blocks is increased by splitting the OFDM symbols into a plurality of OFDM symbols, thereby further improving the diversity gain and reducing the expenses of AGC and GP.
As shown in fig. 9, an embodiment of the present invention further provides an apparatus for transmit diversity in a multi-antenna communication system, where the multi-antenna communication system includes an antenna port, and the apparatus includes:
a first information determining module 91, configured to determine data information of data to be sent and a sending subframe of the data to be sent;
a dividing module 92, configured to divide the transmission subframe into a plurality of precoding sub-blocks in a time domain according to an orthogonal frequency division multiplexing OFDM symbol in the transmission subframe; wherein one precoded sub-block comprises at least one first OFDM symbol occupied by a pilot symbol;
a first precoding module 93, configured to perform precoding operation on a first OFDM symbol and a second OFDM symbol occupied by data information of the multiple precoded sub-blocks, respectively, and send the data information after the precoding operation through the antenna port; and precoding the first OFDM symbol and the second OFDM symbol in the same precoding sub-block to be the same precoding operation.
Specifically, in the foregoing embodiment of the present invention, the first precoding module includes:
the matrix determination submodule is used for randomly selecting a precoding matrix for each precoding subblock from a preset precoding matrix set; or the plurality of precoding sub-blocks select a precoding matrix per se from a preset precoding matrix set according to a predetermined sequence;
and the precoding submodule is used for carrying out precoding operation on the first OFDM symbol and the second OFDM symbol in the precoding subblock by utilizing the selected precoding matrix.
Specifically, the apparatus in the above embodiment of the present invention further includes:
a first splitting module, configured to split the first OFDM symbol occupied by the pilot symbol into a plurality of first sub-OFDM symbols;
the dividing module includes:
a first dividing module, configured to divide the transmission subframe into a plurality of precoded sub-blocks in a time domain according to a first sub-OFDM symbol and a second OFDM symbol in the transmission subframe; wherein one precoded sub-block comprises at least one first sub-OFDM symbol.
Specifically, the apparatus in the above embodiment of the present invention further includes:
a second splitting module, configured to split the second OFDM symbol occupied by the data information into a plurality of second sub-OFDM symbols;
the dividing module includes:
the second division submodule is used for dividing the sending subframe into a plurality of precoding subblocks in a time domain according to the first OFDM symbol and the second OFDM symbol in the sending subframe; wherein one precoded sub-block comprises at least one first OFDM symbol.
Specifically, the apparatus in the above embodiment of the present invention further includes:
a third splitting module, configured to split the first OFDM symbol occupied by the pilot symbol into a plurality of first sub-OFDM symbols, and split the second OFDM symbol occupied by the data information into a plurality of second sub-OFDM symbols;
the dividing module includes:
the third division submodule is used for dividing the sending subframe into a plurality of precoding subblocks in a time domain according to the first sub-OFDM symbol and the second sub-OFDM symbol in the sending subframe; wherein one precoded sub-block comprises at least one first sub-OFDM symbol.
Specifically, the apparatus in the above embodiment of the present invention further includes:
the second information determining module is used for determining scheduling distribution information of data to be sent when the sending subframe is a short subframe;
the second precoding module is used for respectively carrying out precoding operation on the first OFDM symbols of the plurality of precoding sub-blocks and the third OFDM symbols occupied by the scheduling distribution information, and sending the scheduling distribution information after the precoding operation through the antenna port; and precoding the first OFDM symbol and the third OFDM symbol in the same precoding sub-block to be the same precoding operation.
In summary, the transmit diversity apparatus provided in the above embodiment of the present invention divides the OFDM symbols in the transmission subframe into a plurality of precoding sub-blocks, and performs precoding operation on each precoding sub-block, so that one data to be transmitted is subjected to multiple precoding processes, thereby improving antenna transmit diversity and precoding gains; and the number of the pre-coding sub-blocks is increased by splitting the OFDM symbols into a plurality of OFDM symbols, thereby further improving the diversity gain and reducing the expenses of AGC and GP.
It should be noted that the apparatus for transmit diversity in a multi-antenna communication system provided by the above embodiments of the present invention is an apparatus capable of implementing the above method for transmit diversity in a multi-antenna communication system, and all embodiments of the above method for transmit diversity in a multi-antenna communication system are applicable to the apparatus and can achieve the same or similar beneficial effects.
As shown in fig. 10, an embodiment of the present invention further provides an apparatus for transmit diversity in a multi-antenna communication system, where the apparatus includes: a processor 100; a memory 120 connected to the processor 100 through a bus interface, and a transceiver 110 connected to the processor 100 through a bus interface; the memory is used for storing programs and data used by the processor in executing operations; transmitting control commands and the like through the transceiver 110; when the processor calls and executes the programs and data stored in the memory, the following functional modules are implemented:
the first information determining module is used for determining data information of data to be sent and sending subframes of the data to be sent;
a dividing module, configured to divide the transmission subframe into a plurality of precoding sub-blocks in a time domain according to an Orthogonal Frequency Division Multiplexing (OFDM) symbol in the transmission subframe; wherein one precoded sub-block comprises at least one first OFDM symbol occupied by a pilot symbol;
the first precoding module is used for respectively carrying out precoding operation on a first OFDM symbol and a second OFDM symbol occupied by data information of the plurality of precoding sub-blocks, and sending the data information after the precoding operation through the antenna port; and precoding the first OFDM symbol and the second OFDM symbol in the same precoding sub-block to be the same precoding operation.
Specifically, the first precoding module includes:
the matrix determination submodule is used for randomly selecting a precoding matrix for each precoding subblock from a preset precoding matrix set; or the plurality of precoding sub-blocks select a precoding matrix per se from a preset precoding matrix set according to a predetermined sequence;
and the precoding submodule is used for carrying out precoding operation on the first OFDM symbol and the second OFDM symbol in the precoding subblock by utilizing the selected precoding matrix.
Specifically, the apparatus further comprises:
a first splitting module, configured to split the first OFDM symbol occupied by the pilot symbol into a plurality of first sub-OFDM symbols;
the dividing module includes:
a first dividing module, configured to divide the transmission subframe into a plurality of precoded sub-blocks in a time domain according to a first sub-OFDM symbol and a second OFDM symbol in the transmission subframe; wherein one precoded sub-block comprises at least one first sub-OFDM symbol.
Specifically, the apparatus further comprises:
a second splitting module, configured to split the second OFDM symbol occupied by the data information into a plurality of second sub-OFDM symbols;
the dividing module includes:
the second division submodule is used for dividing the sending subframe into a plurality of precoding subblocks in a time domain according to the first OFDM symbol and the second OFDM symbol in the sending subframe; wherein one precoded sub-block comprises at least one first OFDM symbol.
Specifically, the apparatus further comprises:
a third splitting module, configured to split the first OFDM symbol occupied by the pilot symbol into a plurality of first sub-OFDM symbols, and split the second OFDM symbol occupied by the data information into a plurality of second sub-OFDM symbols;
the dividing module includes:
the third division submodule is used for dividing the sending subframe into a plurality of precoding subblocks in a time domain according to the first sub-OFDM symbol and the second sub-OFDM symbol in the sending subframe; wherein one precoded sub-block comprises at least one first sub-OFDM symbol.
Specifically, the apparatus further comprises:
the second information determining module is used for determining scheduling distribution information of data to be sent when the sending subframe is a short subframe;
the second precoding module is used for respectively carrying out precoding operation on the first OFDM symbols of the plurality of precoding sub-blocks and the third OFDM symbols occupied by the scheduling distribution information, and sending the scheduling distribution information after the precoding operation through the antenna port; and precoding the first OFDM symbol and the third OFDM symbol in the same precoding sub-block to be the same precoding operation.
Where in fig. 10 the bus architecture may include any number of interconnected buses and bridges, with various circuits of one or more processors, represented by processor 100, and memory, represented by memory 120, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 110 may be a number of elements, including a transmitter and a transceiver, providing a means for communicating with various other apparatus over a transmission medium. The processor 100 is responsible for managing the bus architecture and general processing, and the memory 120 may store data used by the processor 100 in performing operations.
The processor 100 is responsible for managing the bus architecture and general processing, and the memory 920 may store data used by the processor 100 in performing operations.
In summary, the transmit diversity apparatus provided in the above embodiment of the present invention divides the OFDM symbols in the transmission subframe into a plurality of precoding sub-blocks, and performs precoding operation on each precoding sub-block, so that one data to be transmitted is subjected to multiple precoding processes, thereby improving antenna transmit diversity and precoding gains; and the number of the pre-coding sub-blocks is increased by splitting the OFDM symbols into a plurality of OFDM symbols, thereby further improving the diversity gain and reducing the expenses of AGC and GP.
It should be noted that the apparatus for transmit diversity in a multi-antenna communication system provided by the above embodiments of the present invention is an apparatus capable of implementing the above method for transmit diversity in a multi-antenna communication system, and all embodiments of the above method for transmit diversity in a multi-antenna communication system are applicable to the apparatus and can achieve the same or similar beneficial effects.
Embodiments of the present invention also provide a computer-readable storage medium having stored thereon a computer program (instructions), which when executed by a processor, implement the steps of:
determining data information of data to be sent and a sending subframe of the data to be sent;
dividing the sending subframe into a plurality of precoding sub-blocks on a time domain according to Orthogonal Frequency Division Multiplexing (OFDM) symbols in the sending subframe; wherein one precoded sub-block comprises at least one first OFDM symbol occupied by a pilot symbol;
respectively carrying out precoding operation on a first OFDM symbol and a second OFDM symbol occupied by data information of the plurality of precoding sub-blocks, and sending the data information after the precoding operation through the antenna port; and precoding the first OFDM symbol and the second OFDM symbol in the same precoding sub-block to be the same precoding operation.
Optionally, the program (instructions), when executed by the processor, may further implement the steps of:
randomly selecting a precoding matrix for each precoding sub-block from a preset precoding matrix set; or the plurality of precoding sub-blocks select a precoding matrix per se from a preset precoding matrix set according to a predetermined sequence; and respectively carrying out precoding operation on the first OFDM symbol and the second OFDM symbol in the precoded sub-block by using the selected precoding matrix.
Optionally, the program (instructions), when executed by the processor, may further implement the steps of:
splitting the first OFDM symbol occupied by the pilot symbol into a plurality of first sub-OFDM symbols;
dividing the transmission subframe into a plurality of precoding sub-blocks in a time domain according to a first sub-OFDM symbol and a second OFDM symbol in the transmission subframe; wherein one precoded sub-block comprises at least one first sub-OFDM symbol.
Optionally, the program (instructions), when executed by the processor, may further implement the steps of:
splitting the second OFDM symbol occupied by the data information into a plurality of second sub-OFDM symbols;
dividing the transmission subframe into a plurality of precoding sub-blocks in a time domain according to a first OFDM symbol and a second OFDM symbol in the transmission subframe; wherein one precoded sub-block comprises at least one first OFDM symbol.
Optionally, the program (instructions), when executed by the processor, may further implement the steps of:
splitting the first OFDM symbol occupied by the pilot symbol into a plurality of first sub-OFDM symbols, and splitting the second OFDM symbol occupied by the data information into a plurality of second sub-OFDM symbols;
dividing the transmission subframe into a plurality of precoding sub-blocks in a time domain according to a first sub-OFDM symbol and a second sub-OFDM symbol in the transmission subframe; wherein one precoded sub-block comprises at least one first sub-OFDM symbol.
Optionally, the program (instructions), when executed by the processor, may further implement the steps of:
determining scheduling distribution information of data to be sent;
respectively carrying out precoding operation on a first OFDM symbol and a third OFDM symbol occupied by scheduling allocation information of the plurality of precoding sub-blocks, and sending the scheduling allocation information after the precoding operation through the antenna port; and precoding the first OFDM symbol and the third OFDM symbol in the same precoding sub-block to be the same precoding operation.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (6)

1. A method of transmit diversity in a multi-antenna communication system, the multi-antenna communication system including an antenna port, the method comprising:
determining data information of data to be sent and a sending subframe of the data to be sent;
dividing the sending subframe into a plurality of precoding sub-blocks on a time domain according to Orthogonal Frequency Division Multiplexing (OFDM) symbols in the sending subframe; wherein one precoded sub-block comprises at least one first OFDM symbol occupied by a pilot symbol;
respectively carrying out precoding operation on a first OFDM symbol and a second OFDM symbol occupied by data information of the plurality of precoding sub-blocks, and sending the data information after the precoding operation through the antenna port; the precoding operation of the first OFDM symbol and the second OFDM symbol in the same precoding sub-block is the same precoding operation;
wherein the method further comprises:
splitting the first OFDM symbol occupied by the pilot symbol into a plurality of first sub-OFDM symbols;
the step of dividing the transmission subframe into a plurality of precoding sub-blocks in a time domain according to the Orthogonal Frequency Division Multiplexing (OFDM) symbol in the transmission subframe includes:
dividing the transmission subframe into a plurality of precoding sub-blocks in a time domain according to a first sub-OFDM symbol and a second OFDM symbol in the transmission subframe; wherein one precoded sub-block comprises at least one first sub-OFDM symbol;
alternatively, the method further comprises:
splitting the second OFDM symbol occupied by the data information into a plurality of second sub-OFDM symbols;
the step of dividing the transmission subframe into a plurality of precoding sub-blocks in a time domain according to the Orthogonal Frequency Division Multiplexing (OFDM) symbol in the transmission subframe includes:
dividing the transmission subframe into a plurality of precoding sub-blocks in a time domain according to a first OFDM symbol and a second OFDM symbol in the transmission subframe; wherein one precoded sub-block comprises at least one first OFDM symbol;
alternatively, the method further comprises:
splitting the first OFDM symbol occupied by the pilot symbol into a plurality of first sub-OFDM symbols, and splitting the second OFDM symbol occupied by the data information into a plurality of second sub-OFDM symbols;
the step of dividing the transmission subframe into a plurality of precoding sub-blocks in a time domain according to the Orthogonal Frequency Division Multiplexing (OFDM) symbol in the transmission subframe includes:
dividing the transmission subframe into a plurality of precoding sub-blocks in a time domain according to a first sub-OFDM symbol and a second sub-OFDM symbol in the transmission subframe; wherein one precoded sub-block comprises at least one first sub-OFDM symbol.
2. The method according to claim 1, wherein the step of performing precoding operation on a first OFDM symbol and a second OFDM symbol occupied by data information of the plurality of precoded sub-blocks respectively to obtain data to be transmitted comprises:
randomly selecting a precoding matrix for each precoding sub-block from a preset precoding matrix set; or the plurality of precoding sub-blocks select a precoding matrix per se from a preset precoding matrix set according to a predetermined sequence;
and respectively carrying out precoding operation on the first OFDM symbol and the second OFDM symbol in the precoded sub-block by using the selected precoding matrix.
3. The method of claim 1, wherein when the transmission subframe is a short subframe,
after dividing the transmission subframe into a plurality of precoded sub-blocks in the time domain according to orthogonal frequency division multiplexing, OFDM, symbols in the transmission subframe, the method further comprises:
determining scheduling distribution information of data to be sent;
respectively carrying out precoding operation on a first OFDM symbol and a third OFDM symbol occupied by scheduling allocation information of the plurality of precoding sub-blocks, and sending the scheduling allocation information after the precoding operation through the antenna port; and precoding the first OFDM symbol and the third OFDM symbol in the same precoding sub-block to be the same precoding operation.
4. An apparatus for transmit diversity in a multiple antenna communication system, the multiple antenna communication system including an antenna port, the apparatus comprising:
the first information determining module is used for determining data information of data to be sent and sending subframes of the data to be sent;
a dividing module, configured to divide the transmission subframe into a plurality of precoding sub-blocks in a time domain according to an Orthogonal Frequency Division Multiplexing (OFDM) symbol in the transmission subframe; wherein one precoded sub-block comprises at least one first OFDM symbol occupied by a pilot symbol;
the first precoding module is used for respectively carrying out precoding operation on a first OFDM symbol and a second OFDM symbol occupied by data information of the plurality of precoding sub-blocks, and sending the data information after the precoding operation through the antenna port; the precoding operation of the first OFDM symbol and the second OFDM symbol in the same precoding sub-block is the same precoding operation;
wherein the apparatus further comprises:
a first splitting module, configured to split the first OFDM symbol occupied by the pilot symbol into a plurality of first sub-OFDM symbols;
the dividing module includes:
a first dividing module, configured to divide the transmission subframe into a plurality of precoded sub-blocks in a time domain according to a first sub-OFDM symbol and a second OFDM symbol in the transmission subframe; wherein one precoded sub-block comprises at least one first sub-OFDM symbol;
alternatively, the apparatus further comprises:
a second splitting module, configured to split the second OFDM symbol occupied by the data information into a plurality of second sub-OFDM symbols;
the dividing module includes:
the second division submodule is used for dividing the sending subframe into a plurality of precoding subblocks in a time domain according to the first OFDM symbol and the second OFDM symbol in the sending subframe; wherein one precoded sub-block comprises at least one first OFDM symbol;
alternatively, the apparatus further comprises:
a third splitting module, configured to split the first OFDM symbol occupied by the pilot symbol into a plurality of first sub-OFDM symbols, and split the second OFDM symbol occupied by the data information into a plurality of second sub-OFDM symbols;
the dividing module includes:
the third division submodule is used for dividing the sending subframe into a plurality of precoding subblocks in a time domain according to the first sub-OFDM symbol and the second sub-OFDM symbol in the sending subframe; wherein one precoded sub-block comprises at least one first sub-OFDM symbol.
5. The apparatus of claim 4, wherein the first precoding module comprises:
the matrix determination submodule is used for randomly selecting a precoding matrix for each precoding subblock from a preset precoding matrix set; or the plurality of precoding sub-blocks select a precoding matrix per se from a preset precoding matrix set according to a predetermined sequence;
and the precoding submodule is used for carrying out precoding operation on the first OFDM symbol and the second OFDM symbol in the precoding subblock by utilizing the selected precoding matrix.
6. The apparatus of claim 4, further comprising:
the second information determining module is used for determining scheduling distribution information of data to be sent when the sending subframe is a short subframe;
the second precoding module is used for respectively carrying out precoding operation on the first OFDM symbols of the plurality of precoding sub-blocks and the third OFDM symbols occupied by the scheduling distribution information, and sending the scheduling distribution information after the precoding operation through the antenna port; and precoding the first OFDM symbol and the third OFDM symbol in the same precoding sub-block to be the same precoding operation.
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