CN108631991B - 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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CN108631991B
CN108631991B CN201710184726.9A CN201710184726A CN108631991B CN 108631991 B CN108631991 B CN 108631991B CN 201710184726 A CN201710184726 A CN 201710184726A CN 108631991 B CN108631991 B CN 108631991B
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ofdm symbols
transmitted
pilot
data
symbol
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CN108631991A (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
    • 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
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time coding
    • H04L1/0637—Properties of the code
    • H04L1/0643—Properties of the code block codes
    • 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

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

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 a pilot frequency sequence to be transmitted of each antenna port; respectively mapping the pilot sequence to be transmitted of each antenna port to resource units (REs) contained in pilot symbols of a target subframe, so that the N antenna ports multiplex the pilot symbols of the target subframe; on the target subframe, each antenna port respectively transmits a pilot sequence to be transmitted on RE of a pilot symbol mapped with the pilot sequence to be transmitted of the antenna port; the embodiment of the invention respectively maps the pilot frequency sequence to be transmitted of each antenna port to the resource unit RE contained in the pilot frequency symbol of the target subframe, thereby realizing the multiplexing of the pilot frequency symbols of different antenna ports, and simultaneously ensuring that the transmission of the pilot frequency sequence on each antenna port meets the characteristic of a single carrier, thereby achieving the purpose of multi-antenna port transmission.

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-14V2X 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-14V2X 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-14V2X 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-14V2X 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-14V2X 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 the data transmission mode of a single antenna 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 N antenna ports, and the method includes:
determining a pilot frequency sequence to be transmitted of each antenna port;
mapping the pilot sequence to be transmitted of each antenna port to resource units (REs) contained in pilot symbols of a target subframe respectively, so that the pilot symbols of the target subframe are multiplexed by the N antenna ports; n is an integer greater than or equal to 2;
and on the target subframe, each antenna port respectively transmits the pilot sequence to be transmitted on the RE of the pilot symbol mapped with the pilot sequence to be transmitted of the antenna port.
Wherein, the step of mapping the pilot sequence to be transmitted of each antenna port to Resource Elements (REs) included in pilot symbols of a target subframe respectively includes:
and mapping the pilot sequence to be transmitted of each antenna port to the RE of one pilot symbol of the target subframe alternately in a frequency division multiplexing mode.
Wherein, the step of mapping the pilot sequence to be transmitted of each antenna port to Resource Elements (REs) included in pilot symbols of a target subframe respectively includes:
respectively mapping the pilot sequence to be transmitted of each antenna port to all REs of a pilot symbol of the target subframe which are overlapped in time in a code division multiplexing mode; the pilot sequences to be transmitted at different antenna ports are different.
Wherein, the step of determining the pilot sequence to be transmitted of each antenna port comprises:
generating different pilot sequences to be transmitted for different antenna ports according to a preset pilot sequence and P different cyclic shifts; wherein the value of P equals the value of N.
Wherein the method further comprises:
and performing space-time coding processing or cyclic delay diversity processing on data to be transmitted, and associating the processed data to be transmitted with the N antenna ports and transmitting the data through the N antenna ports.
Wherein, the step of performing space-time coding processing on the data to be transmitted, associating the processed data to be transmitted with the N antenna ports and transmitting the data through the N antenna ports includes:
layering the data to be transmitted, performing space-time coding operation on the multi-layer data by using space-time block coding (STBC), and determining M groups of data to be transmitted; each group of data to be transmitted comprises Q data; m is an integer greater than or equal to 2, and Q is equal to N;
selecting M OFDM symbols from orthogonal frequency division multiplexing OFDM symbols of a target subframe, and mapping the M groups of data to be transmitted to the selected M OFDM symbols respectively;
and respectively transmitting Q data included in a group of data to be transmitted mapped to the OFDM symbols from the N antenna ports in the time slot intervals corresponding to the M OFDM symbols.
Before transmitting Q data included in a group of data to be transmitted mapped to the OFDM symbol from the N antenna ports, in the time slot intervals corresponding to the M OFDM symbols, respectively, the method further includes:
respectively carrying out inverse discrete Fourier transform on Q data included in each group of data to be transmitted;
the step of transmitting Q data included in a group of data to be transmitted mapped to the OFDM symbol from the N antenna ports, within the time slot intervals corresponding to the M OFDM symbols, respectively, includes:
and in the time slot intervals corresponding to the M OFDM symbols respectively, transmitting Q data which are included in a group of data to be transmitted and mapped to the OFDM symbols and are subjected to inverse discrete Fourier transform from the N antenna ports respectively.
Wherein, when N is equal to 2 and M is equal to 2,
the step of selecting M OFDM symbols from orthogonal frequency division multiplexing OFDM symbols of a target subframe comprises:
and selecting adjacent 2 OFDM symbols from other OFDM symbols except pilot symbols in the target subframe.
Wherein, when N is equal to 2 and M is equal to 2,
the step of selecting M OFDM symbols from orthogonal frequency division multiplexing OFDM symbols of a target subframe comprises:
selecting adjacent 2 OFDM symbols from other OFDM symbols except pilot symbols and isolated OFDM symbols in the target subframe;
the isolated OFDM symbols are the first last OFDM symbol and the second last OFDM symbol in the target subframe; or the isolated OFDM symbols are a first OFDM symbol and a second OFDM symbol in the target subframe; or the isolated OFDM symbols are the first last OFDM symbol, the second last OFDM symbol, the first OFDM symbol and the second OFDM symbol in the target subframe.
Wherein, when N is equal to 2 and M is equal to 2,
the step of selecting M OFDM symbols from orthogonal frequency division multiplexing OFDM symbols of a target subframe comprises:
selecting 2 OFDM symbols at two sides of a pilot symbol from other OFDM symbols except the pilot symbol and an isolated OFDM symbol in the target subframe;
the isolated OFDM symbols are the first OFDM symbol and the last OFDM symbol in the target subframe.
Wherein the isolated OFDM symbol is associated with any one of 2 antenna ports by a configuration or a predetermined manner; alternatively, the first and second electrodes may be,
the isolated OFDM symbols are sequentially associated with 2 antenna ports in turn according to a preset rule.
Before selecting M OFDM symbols from the OFDM symbols of the target subframe, the method further includes:
splitting other OFDM symbols except pilot symbols in the target sub-frame into 2 sub-OFDM symbols respectively;
when N is equal to 2 and M is equal to 2, the step of selecting M OFDM symbols from orthogonal frequency division multiplexing OFDM symbols of the target subframe includes:
and determining 2 sub-OFDM symbols obtained by splitting one OFDM symbol as 2 selected OFDM symbols in the OFDM symbols of the target subframe.
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 N antenna ports, and the device includes:
a sequence determining module, configured to determine a pilot sequence to be transmitted for each antenna port;
a first mapping module, configured to map the pilot sequence to be transmitted of each antenna port to resource units (REs) included in pilot symbols of a target subframe, respectively, so that the N antenna ports multiplex the pilot symbols of the target subframe; n is an integer greater than or equal to 2;
and a pilot sending module, configured to send, on the target subframe, the pilot sequence to be transmitted on the RE of the pilot symbol mapped with the pilot sequence to be transmitted of the antenna port, respectively, for each antenna port.
Wherein the first mapping module comprises:
and the first mapping sub-module is used for mapping the pilot sequence to be transmitted of each antenna port to the RE of one pilot symbol of the target subframe alternately in a frequency division multiplexing mode.
Wherein the first mapping module comprises:
a second mapping sub-module, configured to map, in a code division multiplexing manner, the pilot sequence to be transmitted of each antenna port to all REs of one pilot symbol of the target subframe that are overlapped in time; the pilot sequences to be transmitted at different antenna ports are different.
Wherein the sequence determination module comprises:
the sequence determination submodule is used for generating different pilot sequences to be transmitted for different antenna ports according to a preset pilot sequence and Q different cyclic shifts; wherein the value of P equals the value of N.
Wherein the apparatus further comprises:
and the diversity transmitting module is used for performing space-time coding processing or cyclic delay diversity processing on the data to be transmitted, and associating the processed data to be transmitted with the N antenna ports and transmitting the data through the N antenna ports.
Wherein the diversity transmission module comprises:
the space-time coding submodule is used for layering the data to be transmitted, carrying out space-time coding operation on multilayer data by utilizing space-time block coding (STBC), and determining M groups of data to be transmitted; each group of data to be transmitted comprises Q data; m is an integer greater than or equal to 2, and Q is equal to N;
the symbol selection submodule is used for selecting M OFDM symbols from orthogonal frequency division multiplexing OFDM symbols of a target subframe and mapping the M groups of data to be transmitted into the selected M OFDM symbols respectively;
and the data sending submodule is used for respectively sending Q data included in a group of data to be sent mapped to the OFDM symbol from the N antenna ports in the time slot intervals corresponding to the M OFDM symbols.
Wherein the apparatus further comprises:
the transformation module is used for respectively carrying out inverse discrete Fourier transform on Q data included in each group of data to be transmitted;
the data sending submodule comprises:
and a data sending unit, configured to send, in the time slot interval corresponding to each of the M OFDM symbols, Q data after inverse discrete fourier transform included in a group of data to be sent mapped to the OFDM symbol, from the N antenna ports, respectively.
Wherein the symbol selection submodule comprises:
a first selection unit, configured to select adjacent 2 OFDM symbols from OFDM symbols other than pilot symbols in the target subframe; where N is equal to 2 and M is equal to 2.
Wherein the symbol selection submodule comprises:
a second selection unit, configured to select adjacent 2 OFDM symbols from other OFDM symbols in the target subframe except for the pilot symbol and the isolated OFDM symbol;
the isolated OFDM symbols are the first last OFDM symbol and the second last OFDM symbol in the target subframe; or the isolated OFDM symbols are a first OFDM symbol and a second OFDM symbol in the target subframe; or the isolated OFDM symbols are the last-but-one OFDM symbol, the first OFDM symbol and the second OFDM symbol in the target subframe; n equals 2 and M equals 2.
Wherein the symbol selection submodule comprises:
a third selecting unit, configured to select 2 OFDM symbols on two sides of the pilot symbol from other OFDM symbols in the target subframe except the pilot symbol and the isolated OFDM symbol;
the isolated OFDM symbols are the first OFDM symbol and the last OFDM symbol in the target subframe, N is equal to 2, and M is equal to 2.
Wherein the isolated OFDM symbol is associated with any one of 2 antenna ports by a configuration or a predetermined manner; alternatively, the first and second electrodes may be,
the isolated OFDM symbols are sequentially associated with 2 antenna ports in turn according to a preset rule.
Wherein the apparatus further comprises:
a splitting module, configured to split other OFDM symbols in the target subframe except for the pilot symbol into 2 sub-OFDM symbols respectively;
the symbol selection submodule includes:
a fourth selecting unit, configured to determine that 2 sub-OFDM symbols obtained by splitting one OFDM symbol are 2 OFDM symbols selected from OFDM symbols of the target subframe; where N is equal to 2 and M is equal to 2.
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 pilot sequence to be transmitted of each antenna port is respectively mapped to the resource units RE contained in the pilot symbols of the target sub-frame, so that the multiplexing of the pilot symbols of different antenna ports is realized, and meanwhile, the transmission of the pilot sequence on each antenna port can meet the characteristic of a single carrier, thereby achieving the purpose of multi-antenna port transmission.
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 frequency division multiplexing pilot symbols in a method for transmit diversity in a multi-antenna communication system according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating code division multiplexing pilot symbols in a method for transmit diversity in a multi-antenna communication system according to an embodiment of the present invention;
fig. 5 is a schematic diagram illustrating transmit diversity using cyclic delay diversity in a method of transmit diversity in a multi-antenna communication system according to an embodiment of the present invention;
fig. 6 is a schematic diagram illustrating the use of space-time coding transmit diversity in the method for transmit diversity in a multi-antenna communication system according to an embodiment of the present invention;
fig. 7 is a diagram illustrating selection of one of OFDM symbol pairs in a method for transmit diversity in a multi-antenna communication system according to an embodiment of the present invention;
fig. 8 is a second schematic diagram illustrating selection of OFDM symbol pairs in a method for transmit diversity in a multi-antenna communication system according to an embodiment of the present invention;
fig. 9 is a third schematic diagram illustrating selection of OFDM symbol pairs in a method for transmit diversity in a multi-antenna communication system according to an embodiment of the present invention;
fig. 10 is a diagram illustrating a fourth exemplary selection of OFDM symbol pairs in a method for transmit diversity in a multi-antenna communication system according to an embodiment of the present invention;
fig. 11 is a diagram illustrating a fifth exemplary selection of OFDM symbol pairs in a method for transmit diversity in a multi-antenna communication system according to an embodiment of the present invention;
fig. 12 is a diagram illustrating one of OFDM symbol pairs selected after splitting OFDM symbols in a method for transmit diversity in a multi-antenna communication system according to an embodiment of the present invention;
fig. 13 is a second schematic diagram illustrating selection of OFDM symbol pairs after splitting OFDM symbols in a method for transmit diversity in a multi-antenna communication system according to an embodiment of the present invention;
fig. 14 is a diagram illustrating selection of OFDM symbol pairs in a short subframe in a method for transmit diversity in a multi-antenna communication system according to an embodiment of the present invention;
fig. 15 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. 16 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 N antenna ports, and the method includes:
step 21, determining a pilot frequency sequence to be transmitted of each antenna port;
step 22, mapping the pilot sequence to be transmitted of each antenna port to resource units RE included in the pilot symbol of the target subframe, so that the pilot symbols of the target subframe are multiplexed by the N antenna ports;
and step 23, on the target subframe, each antenna port transmits the pilot sequence to be transmitted on the RE of the pilot symbol mapped with the pilot sequence to be transmitted of the antenna port.
In the above embodiments of the present invention, the pilot sequences to be transmitted at different antenna ports may be the same or different. Specifically, different antenna ports multiplex pilot symbols of the same target subframe. For example, one pilot symbol includes 12 resource elements REs, and in step 22 of the embodiment of the present invention, a pilot sequence to be transmitted may be mapped to REs in different frequency domains of one pilot symbol in a frequency division multiplexing manner; alternatively, in step 22 of the embodiment of the present invention, the pilot sequence to be transmitted may be mapped to all REs of one pilot symbol in a code division multiplexing manner.
Further, step 22 in the embodiment of the present invention includes:
step 221, alternately mapping the pilot sequence to be transmitted of each antenna port to the RE of one pilot symbol of the target subframe in a frequency division multiplexing manner.
As shown in fig. 3, the multi-antenna communication system includes 2 antenna ports, which are a first antenna port and a second antenna port; the 2 antenna ports alternately occupy REs of one pilot symbol. For example, taking the first pilot symbol of the target subframe as an example, the first pilot symbol in the target subframe includes 12 REs, then as shown in fig. 3, the first RE, the third RE, the fifth RE, the seventh RE, the ninth RE, and the tenth RE of the first pilot symbol are occupied by the first antenna port (that is, the pilot sequence to be transmitted of the first antenna port is mapped to the first RE, the third RE, the fifth RE, the seventh RE, the ninth RE, and the tenth RE of the first pilot symbol); and the second RE, the fourth RE, the sixth RE, the eighth RE, the tenth RE, and the twelfth RE of the first pilot symbol are occupied by the second antenna port (i.e., the pilot sequence to be transmitted of the second antenna port is mapped to the second RE, the fourth RE, the sixth RE, the eighth RE, the tenth RE, and the twelfth RE of the first pilot symbol).
Specifically, the pilot sequence to be transmitted is a ZC sequence. Furthermore, the transmission power of the pilot sequence to be transmitted of each antenna port can be used to make the transmission power on each symbol consistent; specifically, the transmission power of the pilot sequence to be transmitted at each antenna port is increased by 3dB on the basis of the existing transmission power.
Alternatively, step 22 comprises:
step 222, respectively mapping the pilot sequence to be transmitted of each antenna port to all the REs of one pilot symbol of the target subframe overlapped in time in a code division multiplexing manner; the pilot sequences to be transmitted at different antenna ports are different.
As shown in fig. 4, the multi-antenna communication system includes 2 antenna ports, which are a first antenna port and a second antenna port; each antenna port occupies all REs of one pilot symbol, and the pilot sequence to be transmitted is different for each antenna port. Specifically, the pilot sequences to be transmitted are ZC sequences. Accordingly, step 21 comprises:
generating different pilot sequences to be transmitted for different antenna ports according to a preset pilot sequence and Q different cyclic shifts; wherein the value of P equals the value of N.
The pilot sequences to be transmitted of different antenna ports are generated through the initialization ID of the same preset pilot sequence and different cyclic shifts, so that better relevant characteristics can be obtained.
Further, an embodiment of the present invention further provides a scheme of multiple antenna port transmit diversity based on the multiple multiplexed pilots, where both the way of multiplexing the pilot symbols based on the frequency division multiplexing manner and the way of multiplexing the pilot symbols based on the code division multiplexing manner are applicable to the scheme of transmit diversity provided in the present application, and for clarity and conciseness, in the following, for the sake of description of a transmit diversity method, in the following specific embodiments, an example is given in which the pilot symbols are multiplexed by the frequency division multiplexing manner.
Specifically, the method in the above embodiment of the present invention further includes:
and step 24, performing space-time coding processing or cyclic delay diversity processing on the data to be transmitted, and associating the processed data to be transmitted with the N antenna ports and transmitting the data through the N antenna ports.
As shown in fig. 5, the method for performing cyclic delay diversity processing on data to be transmitted includes: and the data to be transmitted is processed by Discrete Fourier Transform (DFT) and Cyclic Delay Diversity (CDD), each symbol of the data to be transmitted generates a fixed time delay, and then the data to be transmitted is associated with different antenna ports and transmitted.
Further, when STBC-based transmit diversity is used, step 24 comprises:
241, layering data to be transmitted, performing space-time coding operation on multilayer data by using a space-time block code (STBC), and determining M groups of data to be transmitted; each group of data to be transmitted comprises Q data; m is an integer greater than or equal to 2, and Q is equal to N;
step 242, selecting M OFDM symbols from OFDM symbols of a target subframe, and mapping the M groups of data to be transmitted to the selected M OFDM symbols respectively;
step 243, in the time slot interval corresponding to the M OFDM symbols, transmitting Q data included in the group of data to be transmitted mapped to the OFDM symbol from the N antenna ports, respectively.
Specifically, before step 243, the method further includes:
respectively carrying out inverse discrete Fourier transform on Q data included in each group of data to be transmitted;
accordingly, step 243 includes:
and in the time slot intervals corresponding to the M OFDM symbols respectively, transmitting Q data which are included in a group of data to be transmitted and mapped to the OFDM symbols and are subjected to inverse discrete Fourier transform from N antenna ports respectively.
As shown in fig. 6, firstly, data is layered, then space-time coding operation is performed on multi-layer data jointly, M groups of data to be transmitted after coding operation are mapped to M OFDM symbols, and then the data are associated with different antenna ports for transmission.
Specifically, under the condition that the subcarrier bandwidth of the direct communication link between the terminals of the current multi-antenna system is 15KHz, if the multi-antenna communication system includes 2 antenna ports and STBC coding can obtain 2 groups of data to be transmitted, the step 242 includes:
and selecting adjacent 2 OFDM symbols from other OFDM symbols except the pilot symbols in the target subframe.
As shown in fig. 7, adjacent OFDM symbols in the target subframe are paired into 2 OFDM symbols mapped with 2 groups of data to be transmitted, respectively.
Alternatively, step 242 includes:
selecting adjacent 2 OFDM symbols from other OFDM symbols except pilot symbols and isolated OFDM symbols in the target subframe;
as shown in fig. 8, the isolated OFDM symbols are the first last OFDM symbol and the second last OFDM symbol in the target subframe; or, as shown in fig. 9, the isolated OFDM symbols are a first OFDM symbol and a second OFDM symbol in the target subframe; alternatively, as shown in fig. 10, the isolated OFDM symbols are a first-to-last OFDM symbol, a second-to-last OFDM symbol, a first OFDM symbol, and a second OFDM symbol in the target subframe.
The main reason that the isolated OFDM symbols are the first to last OFDM symbol and the second to last OFDM symbol in the target subframe is that the last OFDM symbol used as the guard interval GP is not transmitted (equal to 0 power transmission), and if the second to last OFDM symbol is paired with the last GP OFDM symbol, the reliability of the second to last OFDM symbol is affected, so the first to last OFDM symbol and the second to last OFDM symbol are set as the isolated OFDM symbols.
The main reason why the isolated OFDM symbols are the first OFDM symbol and the second OFDM symbol in the target subframe is that the first OFDM symbol for AGC may not be received correctly, and if the first OFDM symbol for AGC and the second OFDM symbol are paired with the last GP OFDM symbol, the reliability of the second OFDM symbol is affected, so the first OFDM symbol and the second OFDM symbol are set as the isolated OFDM symbols.
Alternatively, step 242 includes:
selecting 2 OFDM symbols at two sides of the pilot symbol from other OFDM symbols except the pilot symbol and the isolated OFDM symbol in the target subframe;
as shown in fig. 11, the isolated OFDM symbols are the first OFDM symbol and the last to last OFDM symbol in the target subframe.
The main reason why the isolated OFDM symbols are the first OFDM symbol and the last OFDM symbol in the target subframe is that the last OFDM symbol used as the guard interval GP is not transmitted (equivalent to 0 power transmission) by the transmitting end, and the first OFDM symbol used for the AGC may not be correctly received; the first OFDM symbol and the last-but-one OFDM symbol are set as isolated OFDM symbols.
Further, the isolated OFDM symbol is processed as follows:
the isolated OFDM symbol is associated with any one of 2 antenna ports in a configuration or pre-determined mode; alternatively, the first and second electrodes may be,
the isolated OFDM symbols are sequentially associated with 2 antenna ports in turn according to a preset rule. For example, even REs are associated with a first antenna port and odd REs are associated with a second antenna port.
Further, if the original OFDM (e.g. 15KHz subcarrier bandwidth) symbol is split into two sub-OFDM symbols (e.g. 30KHz subcarrier bandwidth), for example, consider the case of introducing a subcarrier bandwidth of 30KHz, the selection of 2 OFDM symbols is as follows.
Firstly, splitting other OFDM symbols except pilot symbols in the target sub-frame into 2 sub-OFDM symbols respectively;
step 242 includes:
and determining 2 sub-OFDM symbols obtained by splitting one OFDM symbol as 2 OFDM symbols selected from the OFDM symbols of the target subframe.
As shown in fig. 12, when only the other OFDM symbols in the target subframe except the pilot symbol are split and the pilot symbol is not split, that is, the OFDM symbol occupied by the original data is split into two sub-OFDM symbols, the two sub-OFDM symbols are the OFDM symbols selected in step 242.
As shown in fig. 13, not only the other OFDM symbols in the target subframe except the pilot symbol are split, but also the pilot symbol is split, so that the OFDM symbol occupied by the original data is split into two sub-OFDM symbols, and the two sub-OFDM symbols are the OFDM symbols selected in step 242; after the pilot symbols are split, the pilot multiplexing modes of different antenna ports can be further multiplexed by a time division multiplexing TDM mode.
On the other hand, if only the pilot symbols are split and the OFDM symbols occupied by the data are not split, the method of selecting 2 OFDM symbols at this time is the same as the method of selecting without splitting symbols, and the description thereof will not be repeated.
In the case of a short subframe, for example, a slot-level TTI or a short subframe consisting of several OFDM symbols, the pairing relationship of 2 OFDM symbols selected in step 242 may be modified in some cases. The method comprises the following specific steps:
the position of the paired OFDM symbols, and the number of isolated OFDM symbols, which are mainly affected in the case of a 15KHz subcarrier bandwidth. The description will be made by taking scheme 1 as an example, as shown in fig. 14. In the case of the potential existence of 30KHz, if the division of the short subframe is divided with the original OFDM symbol as granularity, the above-mentioned OFDM symbol pairing method in fig. 12 and 13 can be directly applied by means of symbol splitting. In the short subframe, the CDD transmission diversity technology can directly extend the scheme in the common subframe to a shorter subframe on the basis of two DMRS ports.
In summary, in the above embodiments of the present invention, the pilot sequence to be transmitted of each antenna port is respectively mapped onto the resource units RE included in the pilot symbol of the target subframe, so as to implement multiplexing of the pilot symbols of different antenna ports, and meanwhile, the transmission of the pilot sequence on each antenna port can also meet the characteristic of a single carrier, thereby achieving the purpose of multi-antenna port transmission; diversity transmission is carried out on a plurality of antenna ports by adopting an STBC diversity coding mode so as to effectively improve the reliability of a link and further effectively increase the communication range between vehicles.
As shown in fig. 15, 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 N antenna ports, and the apparatus includes:
a sequence determining module 151, configured to determine a pilot sequence to be transmitted for each antenna port;
a first mapping module 152, configured to map the pilot sequence to be transmitted of each antenna port to resource units RE included in pilot symbols of a target subframe, so that the N antenna ports multiplex the pilot symbols of the target subframe;
and a pilot sending module 153, configured to, on the target subframe, respectively send a pilot sequence to be transmitted on an RE of a pilot symbol mapped with the pilot sequence to be transmitted of the antenna port at each antenna port.
Specifically, in the foregoing embodiment of the present invention, the first mapping module includes:
and the first mapping sub-module is used for mapping the pilot sequence to be transmitted of each antenna port to the RE of one pilot symbol of the target sub-frame in an alternative way in a frequency division multiplexing mode.
Specifically, in the foregoing embodiment of the present invention, the first mapping module includes:
a second mapping sub-module, configured to map, in a code division multiplexing manner, the pilot sequence to be transmitted of each antenna port to all REs of one pilot symbol of the target subframe that are overlapped in time; the pilot sequences to be transmitted at different antenna ports are different.
Specifically, the sequence determining module in the above embodiment of the present invention includes:
the sequence determination submodule is used for generating different pilot sequences to be transmitted for different antenna ports according to a preset pilot sequence and Q different cyclic shifts; wherein the value of P equals the value of N.
Specifically, the apparatus in the above embodiment of the present invention further includes:
and the diversity transmitting module is used for performing space-time coding processing or cyclic delay diversity processing on the data to be transmitted, and associating the processed data to be transmitted with the N antenna ports and transmitting the data through the N antenna ports.
Specifically, in the above embodiment of the present invention, the diversity transmitting module includes:
the space-time coding submodule is used for layering data to be transmitted, carrying out space-time coding operation on multilayer data by utilizing a space-time block code (STBC), and determining M groups of data to be transmitted; each group of data to be transmitted comprises Q data; m is an integer greater than or equal to 2, and Q is equal to N;
the symbol selection submodule is used for selecting M OFDM symbols from orthogonal frequency division multiplexing OFDM symbols of a target subframe and mapping the M groups of data to be transmitted into the selected M OFDM symbols respectively;
and the data sending submodule is used for respectively sending the Q data included in the group of data to be sent mapped to the OFDM symbol from the N antenna ports in the time slot intervals corresponding to the M OFDM symbols.
Specifically, the apparatus in the above embodiment of the present invention further includes:
the transformation module is used for respectively carrying out inverse discrete Fourier transform on Q data included in each group of data to be transmitted;
the data sending submodule comprises:
and the data sending unit is used for respectively sending the Q data which are subjected to inverse discrete Fourier transform and included in the group of data to be sent and mapped to the OFDM symbols from the N antenna ports in the time slot intervals corresponding to the M OFDM symbols.
Specifically, in the foregoing embodiment of the present invention, the symbol selection sub-module includes:
a first selection unit, configured to select adjacent 2 OFDM symbols from OFDM symbols except for pilot symbols in the target subframe; where N is equal to 2 and M is equal to 2.
Specifically, in the foregoing embodiment of the present invention, the symbol selection sub-module includes:
a second selection unit, configured to select adjacent 2 OFDM symbols from other OFDM symbols in the target subframe except for the pilot symbol and the isolated OFDM symbol;
the isolated OFDM symbols are the first last OFDM symbol and the second last OFDM symbol in the target subframe; or the isolated OFDM symbols are a first OFDM symbol and a second OFDM symbol in the target subframe; or the isolated OFDM symbols are the last-but-one OFDM symbol, the first OFDM symbol and the second OFDM symbol in the target subframe; n equals 2 and M equals 2.
Specifically, in the foregoing embodiment of the present invention, the symbol selection sub-module includes:
a third selecting unit, configured to select 2 OFDM symbols on two sides of the pilot symbol from other OFDM symbols in the target subframe except the pilot symbol and the isolated OFDM symbol;
the isolated OFDM symbols are the first OFDM symbol and the last OFDM symbol in the target subframe, N is equal to 2, and M is equal to 2.
Specifically, in the above embodiment of the present invention, the isolated OFDM symbol is associated with any one of 2 antenna ports through a configuration or a predetermined manner; alternatively, the first and second electrodes may be,
the isolated OFDM symbols are sequentially associated with 2 antenna ports in turn according to a preset rule.
Specifically, the apparatus in the above embodiment of the present invention further includes:
a splitting module, configured to split other OFDM symbols in the target subframe except for the pilot symbol into 2 sub-OFDM symbols respectively;
the symbol selection submodule includes:
a fourth selecting unit, configured to determine that 2 sub-OFDM symbols obtained by splitting one OFDM symbol are 2 OFDM symbols selected from OFDM symbols of the target subframe; where N is equal to 2 and M is equal to 2.
In summary, in the above embodiments of the present invention, the pilot sequence to be transmitted of each antenna port is respectively mapped onto the resource units RE included in the pilot symbol of the target subframe, so as to implement multiplexing of the pilot symbols of different antenna ports, and meanwhile, the transmission of the pilot sequence on each antenna port can also meet the characteristic of a single carrier, thereby achieving the purpose of multi-antenna port transmission; diversity transmission is carried out on a plurality of antenna ports by adopting an STBC diversity coding mode so as to effectively improve the reliability of a link and further effectively increase the communication range between vehicles.
It should be noted that the apparatus for transmit diversity in a multi-antenna communication system according to the embodiments of the present invention is an apparatus capable of performing the above method for transmit diversity in a multi-antenna communication system, and all the 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. 16, 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 N antenna ports, and 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:
a sequence determining module, configured to determine a pilot sequence to be transmitted for each antenna port;
a first mapping module, configured to map the pilot sequence to be transmitted of each antenna port to resource units RE included in pilot symbols of a target subframe, so that the N antenna ports multiplex the pilot symbols of the target subframe;
and the pilot frequency sending module is used for transmitting the pilot frequency sequence to be transmitted on the RE of the pilot frequency symbol mapped with the pilot frequency sequence to be transmitted of each antenna port on the target subframe.
Specifically, the first mapping module includes:
and the first mapping sub-module is used for mapping the pilot sequence to be transmitted of each antenna port to the RE of one pilot symbol of the target sub-frame in an alternative way in a frequency division multiplexing mode.
Specifically, the first mapping module includes:
a second mapping sub-module, configured to map, in a code division multiplexing manner, the pilot sequence to be transmitted of each antenna port to all REs of one pilot symbol of the target subframe that are overlapped in time; the pilot sequences to be transmitted at different antenna ports are different.
Specifically, the sequence determination module includes:
the sequence determination submodule is used for generating different pilot sequences to be transmitted for different antenna ports according to a preset pilot sequence and Q different cyclic shifts; wherein the value of P equals the value of N.
Specifically, the apparatus further comprises:
and the diversity transmitting module is used for performing space-time coding processing or cyclic delay diversity processing on the data to be transmitted, and associating the processed data to be transmitted with the N antenna ports and transmitting the data through the N antenna ports.
Specifically, the diversity transmitting module includes:
the space-time coding submodule is used for layering data to be transmitted, carrying out space-time coding operation on multilayer data by utilizing a space-time block code (STBC), and determining M groups of data to be transmitted; each group of data to be transmitted comprises Q data; m is an integer greater than or equal to 2, and Q is equal to N;
the symbol selection submodule is used for selecting M OFDM symbols from orthogonal frequency division multiplexing OFDM symbols of a target subframe and mapping the M groups of data to be transmitted into the selected M OFDM symbols respectively;
and the data sending submodule is used for respectively sending the Q data included in the group of data to be sent mapped to the OFDM symbol from the N antenna ports in the time slot intervals corresponding to the M OFDM symbols.
Specifically, the apparatus further comprises:
the transformation module is used for respectively carrying out inverse discrete Fourier transform on Q data included in each group of data to be transmitted;
the data sending submodule comprises:
and the data sending unit is used for respectively sending the Q data which are subjected to inverse discrete Fourier transform and included in the group of data to be sent and mapped to the OFDM symbols from the N antenna ports in the time slot intervals corresponding to the M OFDM symbols.
Specifically, the symbol selection sub-module includes:
a first selection unit, configured to select adjacent 2 OFDM symbols from OFDM symbols except for pilot symbols in the target subframe; where N is equal to 2 and M is equal to 2.
Specifically, the symbol selection sub-module includes:
a second selection unit, configured to select adjacent 2 OFDM symbols from other OFDM symbols in the target subframe except for the pilot symbol and the isolated OFDM symbol;
the isolated OFDM symbols are the first last OFDM symbol and the second last OFDM symbol in the target subframe; or the isolated OFDM symbols are a first OFDM symbol and a second OFDM symbol in the target subframe; or the isolated OFDM symbols are the last-but-one OFDM symbol, the first OFDM symbol and the second OFDM symbol in the target subframe; n equals 2 and M equals 2.
Specifically, the symbol selection sub-module includes:
a third selecting unit, configured to select 2 OFDM symbols on two sides of the pilot symbol from other OFDM symbols in the target subframe except the pilot symbol and the isolated OFDM symbol;
the isolated OFDM symbols are the first OFDM symbol and the last OFDM symbol in the target subframe, N is equal to 2, and M is equal to 2.
Specifically, the isolated OFDM symbol is associated with any one of 2 antenna ports by a configuration or a predetermined manner; alternatively, the first and second electrodes may be,
the isolated OFDM symbols are sequentially associated with 2 antenna ports in turn according to a preset rule.
Specifically, the apparatus further comprises:
a splitting module, configured to split other OFDM symbols in the target subframe except for the pilot symbol into 2 sub-OFDM symbols respectively;
the symbol selection submodule includes:
a fourth selecting unit, configured to determine that 2 sub-OFDM symbols obtained by splitting one OFDM symbol are 2 OFDM symbols selected from OFDM symbols of the target subframe; where N is equal to 2 and M is equal to 2.
Where in fig. 16, 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 a pilot frequency sequence to be transmitted of each antenna port;
respectively mapping the pilot sequence to be transmitted of each antenna port to resource units (REs) contained in pilot symbols of a target subframe, so that the N antenna ports multiplex the pilot symbols of the target subframe;
and on the target subframe, each antenna port respectively transmits the pilot sequence to be transmitted on the RE of the pilot symbol mapped with the pilot sequence to be transmitted of the antenna port.
Optionally, the program (instructions), when executed by the processor, may further implement the steps of:
and mapping the pilot sequence to be transmitted of each antenna port to the RE of one pilot symbol of the target subframe alternately in a frequency division multiplexing mode.
Optionally, the program (instructions), when executed by the processor, may further implement the steps of:
respectively mapping the pilot sequence to be transmitted of each antenna port to all REs of a pilot symbol of the target subframe which are overlapped in time in a code division multiplexing mode; the pilot sequences to be transmitted at different antenna ports are different.
Optionally, the program (instructions), when executed by the processor, may further implement the steps of:
generating different pilot sequences to be transmitted for different antenna ports according to a preset pilot sequence and Q different cyclic shifts; wherein the value of P equals the value of N.
Optionally, the program (instructions), when executed by the processor, may further implement the steps of:
and performing space-time coding processing or cyclic delay diversity processing on data to be transmitted, and associating the processed data to be transmitted with the N antenna ports and transmitting the data through the N antenna ports.
Optionally, the program (instructions), when executed by the processor, may further implement the steps of:
layering data to be transmitted, performing space-time coding operation on multilayer data by using space-time block coding (STBC), and determining M groups of data to be transmitted; each group of data to be transmitted comprises Q data; m is an integer greater than or equal to 2, and Q is equal to N;
selecting M OFDM symbols from OFDM symbols of a target subframe, and mapping the M groups of data to be transmitted to the selected M OFDM symbols respectively;
and respectively transmitting Q data included in a group of data to be transmitted mapped to the OFDM symbols from N antenna ports in the time slot intervals corresponding to the M OFDM symbols.
Optionally, the program (instructions), when executed by the processor, may further implement the steps of:
respectively carrying out inverse discrete Fourier transform on Q data included in each group of data to be transmitted;
and in the time slot intervals corresponding to the M OFDM symbols respectively, transmitting Q data which are included in a group of data to be transmitted and mapped to the OFDM symbols and are subjected to inverse discrete Fourier transform from N antenna ports respectively.
Optionally, the program (instructions), when executed by the processor, may further implement the steps of:
and selecting adjacent 2 OFDM symbols from other OFDM symbols except the pilot symbols in the target subframe.
Optionally, the program (instructions), when executed by the processor, may further implement the steps of:
selecting adjacent 2 OFDM symbols from other OFDM symbols except pilot symbols and isolated OFDM symbols in the target subframe;
the isolated OFDM symbols are the first last OFDM symbol and the second last OFDM symbol in the target subframe; or the isolated OFDM symbols are a first OFDM symbol and a second OFDM symbol in the target subframe; or the isolated OFDM symbols are the first last OFDM symbol, the second last OFDM symbol, the first OFDM symbol and the second OFDM symbol in the target subframe.
Optionally, the program (instructions), when executed by the processor, may further implement the steps of:
selecting 2 OFDM symbols at two sides of the pilot symbol from other OFDM symbols except the pilot symbol and the isolated OFDM symbol in the target subframe;
the isolated OFDM symbols are the first OFDM symbol and the last OFDM symbol in the target subframe.
Optionally, the program (instructions), when executed by the processor, may further implement the steps of:
splitting other OFDM symbols except pilot symbols in the target sub-frame into 2 sub-OFDM symbols respectively;
and determining 2 sub-OFDM symbols obtained by splitting one OFDM symbol as 2 OFDM symbols selected from the OFDM symbols of the target subframe.
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 disk storage or other magnetic storage devices, or any other non-transmission medium which 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 (14)

1. A method of transmit diversity in a multi-antenna communication system, the multi-antenna communication system including N antenna ports, the method comprising:
determining a pilot frequency sequence to be transmitted of each antenna port;
mapping the pilot sequence to be transmitted of each antenna port to resource units (REs) contained in pilot symbols of a target subframe respectively, so that the pilot symbols of the target subframe are multiplexed by the N antenna ports; n is an integer greater than or equal to 2;
on the target subframe, each antenna port respectively transmits the pilot sequence to be transmitted on the RE of the pilot symbol mapped with the pilot sequence to be transmitted of the antenna port;
the method further comprises the following steps:
performing space-time coding processing or cyclic delay diversity processing on data to be transmitted, and associating the processed data to be transmitted with the N antenna ports and transmitting the data through the N antenna ports;
wherein, the step of performing space-time coding processing on the data to be transmitted, associating the processed data to be transmitted with the N antenna ports and transmitting the data through the N antenna ports includes:
layering the data to be transmitted, performing space-time coding operation on the multi-layer data by using space-time block coding (STBC), and determining M groups of data to be transmitted; each group of data to be transmitted comprises Q data; m is an integer greater than or equal to 2, and Q is equal to N;
selecting M OFDM symbols from orthogonal frequency division multiplexing OFDM symbols of a target subframe, and mapping the M groups of data to be transmitted to the selected M OFDM symbols respectively;
respectively transmitting Q data included in a group of data to be transmitted mapped to the OFDM symbols from the N antenna ports in the time slot intervals corresponding to the M OFDM symbols;
when N is equal to 2 and M is equal to 2, the step of selecting M OFDM symbols from orthogonal frequency division multiplexing OFDM symbols of the target subframe includes:
selecting adjacent 2 OFDM symbols from other OFDM symbols except pilot symbols and isolated OFDM symbols in the target subframe;
the isolated OFDM symbols are the first last OFDM symbol and the second last OFDM symbol in the target subframe; or the isolated OFDM symbols are a first OFDM symbol and a second OFDM symbol in the target subframe; or the isolated OFDM symbols are the last-but-one OFDM symbol, the first OFDM symbol and the second OFDM symbol in the target subframe;
or, when N is equal to 2 and M is equal to 2, the step of selecting M OFDM symbols from orthogonal frequency division multiplexing OFDM symbols of the target subframe includes:
selecting 2 OFDM symbols at two sides of a pilot symbol from other OFDM symbols except the pilot symbol and an isolated OFDM symbol in the target subframe;
the isolated OFDM symbols are the first OFDM symbol and the last OFDM symbol in the target subframe.
2. The method according to claim 1, wherein the step of mapping the pilot sequence to be transmitted for each antenna port to Resource Elements (REs) included in pilot symbols of a target subframe respectively comprises:
and mapping the pilot sequence to be transmitted of each antenna port to the RE of one pilot symbol of the target subframe alternately in a frequency division multiplexing mode.
3. The method according to claim 1, wherein the step of mapping the pilot sequence to be transmitted for each antenna port to Resource Elements (REs) included in pilot symbols of a target subframe respectively comprises:
respectively mapping the pilot sequence to be transmitted of each antenna port to all REs of a pilot symbol of the target subframe which are overlapped in time in a code division multiplexing mode; the pilot sequences to be transmitted at different antenna ports are different.
4. The method of claim 3, wherein the step of determining the pilot sequence to be transmitted for each antenna port comprises:
generating different pilot sequences to be transmitted for different antenna ports according to a preset pilot sequence and P different cyclic shifts; wherein the value of P equals the value of N.
5. The method according to claim 1, wherein before transmitting Q data included in a group of data to be transmitted mapped to the OFDM symbol from the N antenna ports in the slot intervals corresponding to the M OFDM symbols, respectively, the method further comprises:
respectively carrying out inverse discrete Fourier transform on Q data included in each group of data to be transmitted;
the step of transmitting Q data included in a group of data to be transmitted mapped to the OFDM symbol from the N antenna ports, within the time slot intervals corresponding to the M OFDM symbols, respectively, includes:
and in the time slot intervals corresponding to the M OFDM symbols respectively, transmitting Q data which are included in a group of data to be transmitted and mapped to the OFDM symbols and are subjected to inverse discrete Fourier transform from the N antenna ports respectively.
6. The method of claim 1, wherein the isolated OFDM symbol is associated with any one of 2 antenna ports by a configuration or a pre-determined manner; alternatively, the first and second electrodes may be,
the isolated OFDM symbols are sequentially associated with 2 antenna ports in turn according to a preset rule.
7. The method of claim 1, wherein before selecting M OFDM symbols from orthogonal frequency division multiplexing OFDM symbols of a target subframe, the method further comprises:
splitting other OFDM symbols except pilot symbols in the target sub-frame into 2 sub-OFDM symbols respectively;
when N is equal to 2 and M is equal to 2, the step of selecting M OFDM symbols from orthogonal frequency division multiplexing OFDM symbols of the target subframe includes:
and determining 2 sub-OFDM symbols obtained by splitting one OFDM symbol as 2 selected OFDM symbols in the OFDM symbols of the target subframe.
8. An apparatus for transmit diversity in a multiple antenna communication system, the multiple antenna communication system including N antenna ports, the apparatus comprising:
a sequence determining module, configured to determine a pilot sequence to be transmitted for each antenna port;
a first mapping module, configured to map the pilot sequence to be transmitted of each antenna port to resource units (REs) included in pilot symbols of a target subframe, respectively, so that the N antenna ports multiplex the pilot symbols of the target subframe; n is an integer greater than or equal to 2;
a pilot sending module, configured to send, on the target subframe, the pilot sequence to be transmitted on the RE of the pilot symbol mapped with the pilot sequence to be transmitted of the antenna port at each antenna port;
the device further comprises:
a diversity transmitting module, configured to perform space-time coding processing or cyclic delay diversity processing on data to be transmitted, associate the processed data to be transmitted with the N antenna ports, and transmit the data through the N antenna ports;
wherein the diversity transmission module comprises:
the space-time coding submodule is used for layering the data to be transmitted, carrying out space-time coding operation on multilayer data by utilizing space-time block coding (STBC), and determining M groups of data to be transmitted; each group of data to be transmitted comprises Q data; m is an integer greater than or equal to 2, and Q is equal to N;
the symbol selection submodule is used for selecting M OFDM symbols from orthogonal frequency division multiplexing OFDM symbols of a target subframe and mapping the M groups of data to be transmitted into the selected M OFDM symbols respectively;
a data sending submodule, configured to send Q data included in a group of data to be sent mapped to the OFDM symbol from the N antenna ports, in a time slot interval corresponding to each of the M OFDM symbols;
the symbol selection submodule includes:
a second selection unit, configured to select adjacent 2 OFDM symbols from other OFDM symbols in the target subframe except for the pilot symbol and the isolated OFDM symbol;
the isolated OFDM symbols are the first last OFDM symbol and the second last OFDM symbol in the target subframe; or the isolated OFDM symbols are a first OFDM symbol and a second OFDM symbol in the target subframe; or the isolated OFDM symbols are the last-but-one OFDM symbol, the first OFDM symbol and the second OFDM symbol in the target subframe; n is equal to 2 and M is equal to 2;
or, the symbol selection submodule includes:
a third selecting unit, configured to select 2 OFDM symbols on two sides of the pilot symbol from other OFDM symbols in the target subframe except the pilot symbol and the isolated OFDM symbol;
the isolated OFDM symbols are the first OFDM symbol and the last OFDM symbol in the target subframe, N is equal to 2, and M is equal to 2.
9. The apparatus of claim 8, wherein the first mapping module comprises:
and the first mapping sub-module is used for mapping the pilot sequence to be transmitted of each antenna port to the RE of one pilot symbol of the target subframe alternately in a frequency division multiplexing mode.
10. The apparatus of claim 8, wherein the first mapping module comprises:
a second mapping sub-module, configured to map, in a code division multiplexing manner, the pilot sequence to be transmitted of each antenna port to all REs of one pilot symbol of the target subframe that are overlapped in time; the pilot sequences to be transmitted at different antenna ports are different.
11. The apparatus of claim 10, wherein the sequence determination module comprises:
the sequence determination submodule is used for generating different pilot sequences to be transmitted for different antenna ports according to a preset pilot sequence and Q different cyclic shifts; wherein the value of P equals the value of N.
12. The apparatus of claim 8, further comprising:
the transformation module is used for respectively carrying out inverse discrete Fourier transform on Q data included in each group of data to be transmitted;
the data sending submodule comprises:
and a data sending unit, configured to send, in the time slot interval corresponding to each of the M OFDM symbols, Q data after inverse discrete fourier transform included in a group of data to be sent mapped to the OFDM symbol, from the N antenna ports, respectively.
13. The apparatus of claim 8, wherein the isolated OFDM symbol is associated with any one of 2 antenna ports by configuration or pre-determined manner; alternatively, the first and second electrodes may be,
the isolated OFDM symbols are sequentially associated with 2 antenna ports in turn according to a preset rule.
14. The apparatus of claim 8, further comprising:
a splitting module, configured to split other OFDM symbols in the target subframe except for the pilot symbol into 2 sub-OFDM symbols respectively;
the symbol selection submodule includes:
a fourth selecting unit, configured to determine that 2 sub-OFDM symbols obtained by splitting one OFDM symbol are 2 OFDM symbols selected from OFDM symbols of the target subframe; where N is equal to 2 and M is equal to 2.
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