CN110071746B - Communication method and device of network device - Google Patents
Communication method and device of network device Download PDFInfo
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- CN110071746B CN110071746B CN201810057897.XA CN201810057897A CN110071746B CN 110071746 B CN110071746 B CN 110071746B CN 201810057897 A CN201810057897 A CN 201810057897A CN 110071746 B CN110071746 B CN 110071746B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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
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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
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
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- 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
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0071—Use of interleaving
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- 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
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Abstract
The communication method and the communication equipment of the network equipment are disclosed, the network equipment comprises a radio frequency chain, the radio frequency chain can be connected with a plurality of antennas, and the radio frequency chain is connected with only one of the plurality of antennas at any time, and the method comprises the following steps: the network equipment performs spatial modulation on the first vector group according to the number of the plurality of antennas to obtain a second vector group; the network equipment interweaves symbol vectors in the second vector group to obtain a third vector group; the network equipment performs inverse Fourier transform, digital-to-analog conversion and modulation on the third vector group to obtain data to be sent; and the network equipment transmits the data to be transmitted. By adopting the method and the equipment, the complexity of the MIMO system can be reduced.
Description
Technical Field
The present application relates to the field of wireless communication technologies, and in particular, to a communication method and device for a network device.
Background
The multiple-input multiple-output (MIMO) technology is to use multiple transmitting antennas and multiple receiving antennas at a transmitting end and a receiving end, respectively, so that signals are transmitted and received through the multiple antennas at the transmitting end and the receiving end, thereby improving communication quality. The multi-antenna multi-transmission multi-receiving system can fully utilize space resources, realizes multi-transmission and multi-reception through a plurality of antennas, and can improve the system capacity by times under the condition of not increasing frequency spectrum resources and antenna transmitting power.
Among these, a typical implementation of a MIMO system is: each antenna has one Radio Frequency (RF) chain exclusively, that is, the number of antennas included in the MIMO system is equal to the number of RF chains. The hardware implementation of the radio frequency chain is complex, so that the hardware complexity of the whole MIMO system is high.
Disclosure of Invention
The application provides a communication method and equipment of network equipment, which are used for reducing the complexity of an MIMO system.
In a first aspect, a communication method of a network device is provided, where the network device includes a radio frequency chain, the radio frequency chain is capable of being connected to multiple antennas, and the radio frequency chain is connected to only one of the multiple antennas at any time, and the method includes: the network device performs spatial modulation on a first vector group according to the number of the plurality of antennas to obtain a second vector group, wherein the number of the plurality of antennas is M, the M is an integer power of 2, the first vector group comprises a plurality of bit vectors, the second vector group comprises a plurality of symbol vectors, and each symbol vector in the plurality of symbol vectors comprises M symbols; the network equipment interweaves symbol vectors in the second vector group to obtain a third vector group; the network equipment performs inverse Fourier transform, digital-to-analog conversion and modulation on the third vector group to obtain data to be sent; and the network equipment transmits the data to be transmitted.
Because the network equipment directly interweaves the symbol vectors, and each symbol vector corresponds to a frequency point, the countermeasure against the frequency domain fading is more direct, and the frequency domain fading can be more effectively countered. Especially when the interleaving of the symbol vectors is combined with the channel coding, the error correction capability of the channel coding can be fully exerted, and the capability of the MIMO system for resisting frequency selective fading is further improved.
In one possible design, the network device interleaves the symbol vectors in the second vector group to obtain a third vector group, including: and the network equipment exchanges the positions of a plurality of symbol vectors in the second vector group according to a preset rule to obtain the third vector group.
In one possible design, the second vector group includes N symbol vectors, which are a first symbol vector and a second symbol vector, respectively, and so on until the nth symbol vector; the preset rule is that the positions of the ith symbol vector and the (N-i + 1) th symbol vector are sequentially exchanged in the second vector group, wherein i is sequentially valued from 1 to N, and N is an integer greater than 1.
The interleaving method is simple and easy to implement, and can improve the efficiency of symbol interleaving.
In one possible design, the network device further includes a processor and a radio frequency chip, the processor is connected to the radio frequency chip, and the radio frequency chip is connected to the radio frequency chain.
In a second aspect, a communication method of a terminal device is provided, the method including: the terminal equipment receives data to be sent; the terminal equipment demodulates, performs analog-to-digital conversion and performs fourier transform on the data to be transmitted to obtain a first vector group, where the first vector group includes a plurality of symbol vectors, and each symbol vector in the plurality of symbol vectors includes M symbols; the terminal equipment de-interleaves the symbol vectors in the first vector group to obtain a second vector group; and the terminal equipment performs spatial demodulation on the second vector group according to the number M of antennas which can be connected by the radio frequency chain in the network equipment to obtain a third vector group, wherein the third vector group comprises a plurality of bit vectors.
In one possible design, the terminal device deinterleaves the symbol vectors in the first vector group to obtain a second vector group, including: and the terminal equipment exchanges the positions of the symbol vectors in the first vector group according to a preset rule to obtain a second vector group.
In one possible design, the first vector group includes N symbol vectors, which are a first symbol vector and a second symbol vector, respectively, and so on until the nth symbol vector;
the preset rule is that the positions of the ith symbol vector and the (N-i + 1) th symbol vector are exchanged in the first vector group, wherein i takes values from 1 to N in sequence, and N is an integer greater than 1.
In a third aspect, the present application provides a communication apparatus of a network device, for the network device, including: comprising means or units for performing the steps of the first aspect above.
In a fourth aspect, the present application provides a communication apparatus for a terminal device, including: comprising means or units for performing the steps of the second aspect above.
In a fifth aspect, the present application provides a communication apparatus for a network device, comprising at least one processing element and at least one memory element, wherein the at least one memory element is configured to store programs and data, and the at least one processing element is configured to execute the method provided in the first aspect of the present application.
In a sixth aspect, the present application provides a communication apparatus for a terminal device, comprising at least one processing element and at least one memory element, wherein the at least one memory element is configured to store a program and data, and the at least one processing element is configured to execute the method provided in the second aspect of the present application.
In a seventh aspect, there is provided a computer-readable storage medium having stored therein instructions, which, when run on a computer, cause the computer to perform the method of any of the first and second aspects.
In an eighth aspect, a communication system is provided, which comprises the network device of the third aspect or the fifth aspect and the terminal device of the fourth aspect or the sixth aspect.
In the application, a plurality of antennas share one radio frequency chain, so that the number of the radio frequency chains of the MIMO system is effectively reduced, and the complexity of the whole MIMO system is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a network device according to an embodiment of the present application;
fig. 2 is another schematic structural diagram of a network device according to an embodiment of the present application;
fig. 3 is a flowchart of a communication method of a network device according to an embodiment of the present application;
FIG. 4 is a flowchart of a process for obtaining a second set of vectors according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of interleaving provided by an embodiment of the present application;
FIG. 6 is another schematic diagram of interleaving provided by an embodiment of the present application;
fig. 7 is another flowchart of a communication method of a network device according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of a network device according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of a terminal device according to an embodiment of the present application;
fig. 10 is a schematic structural diagram of a communication device according to an embodiment of the present application;
fig. 11 is a schematic structural diagram of a communication device according to an embodiment of the present application;
fig. 12 is a schematic structural diagram of a communication system according to an embodiment of the present application.
Detailed Description
The application provides a communication method and device of network equipment, which are used for reducing the complexity of an MIMO system. The method and the device are based on the same inventive concept, and because the principles of solving the problems of the method and the device are similar, the embodiments of the device and the method can be mutually referred, and repeated parts are not described again.
As shown in fig. 1, the present application provides a hardware implementation of a network device, the network device comprising: the device comprises a processor, a radio frequency chip, a radio frequency chain and an antenna.
The processor can be connected with N radio frequency chips, wherein the N radio frequency chips can be a radio frequency chip 1, a radio frequency chip 2 and the like in sequence until the radio frequency chip N, and N is a positive integer.
Each radio frequency chip in the N radio frequency chips can be connected with one or more radio frequency chains, and the number of the radio frequency chains connected with each radio frequency chip can be the same or different. For example, the rf chip 1 may be connected to 1 rf chip, and the rf chip N may be connected to 2 rf chips, etc.
Each radio frequency chain can be connected with a plurality of antennas, each radio frequency chain is connected with only one antenna at any time, and the radio frequency chains can be connected with the antennas through single-pole double-throw switches or single-pole double-throw switches. Taking a single-pole multi-throw switch as an example, a common terminal (common terminal) of the single-pole multi-throw switch may be connected to a radio frequency chain, a choose terminal (choose terminal) may be connected to an antenna, and the single-pole double-throw switch or the single-pole multi-throw switch may be implemented by a relay or the like.
For example, as shown in fig. 2, the network device includes a processor, two rf chips, two rf chains, and four antennas. The processor may be connected to two radio frequency chips, each radio frequency chip may be connected to one radio frequency chain, each radio frequency chain may be connected to antenna 1 at time a, and each radio frequency chain may be connected to antenna 2 at time B. In the embodiment of the present application, when the connection between the rf chain and the multiple antennas is implemented by using a single-pole multi-throw switch, a common terminal of the single-pole multi-throw switch may be associated with the rf chain, and a selection terminal of the single-pole multi-throw switch may be connected to the antenna 1 at time a and connected to the antenna 2 at time B.
In the embodiment of the present application, the rf chip may be integrated into the processor or may be independent. The radio frequency chain may be integrated in the processor or exist independently. The processor may be a central processing unit, such as a network processor or a System On Chip (SOC).
In this application, the radio frequency chain may include hardware such as a power amplifier and a filter, and further, the radio frequency chain may further include hardware such as a coupler and a duplexer. Since in the network device shown in fig. 1, a plurality of antennas share one radio frequency chain, the number of antennas included in the network device is smaller than the number of included radio frequency chains. The network device includes the same number of antennas as the number of radio frequency chains included, as opposed to one radio frequency chain exclusively occupied by each antenna. With the network device shown in fig. 1, the number of radio frequency chains can be reduced, thereby reducing the hardware cost of the network device and the complexity of the network device.
In the network device shown in fig. 1, each rf chain is connected to two antennas, however, the structure shown in fig. 1 is only an example of the network device according to the embodiment of the present invention, and is not intended to limit the present application. In the network device shown in fig. 1, one radio frequency chain can be connected to M antennas, M being an integer power of 2.
Based on the network device provided in fig. 1, and it is set in fig. 1 that each rf chain can be connected to M antennas, and one rf chain is connected to only one of the M antennas at any time. The present application provides a communication method of a network device, as shown in fig. 3, the method includes:
step S301: the network device spatially modulates the first vector group according to the number (M) of transmit antennas to which each radio frequency chain can be connected to obtain a second vector group. In this embodiment, the network device may perform scrambling (scrambling), channel coding, and serial-to-parallel conversion on a bit stream to be transmitted in sequence to obtain a first vector group.
In an example of the present application, the network device may first scramble a bit stream to be transmitted to obtain a scrambled bit stream; then, carrying out channel coding on the scrambled bit stream to obtain a channel coded bit stream; and finally, carrying out serial-to-parallel conversion on the channel coded bit stream to obtain a first vector group.
In an example of the present application, the process of serial-to-parallel transforming the channel coded bit stream may be as follows: first, the size m of a spatial modulation mapping bit block is calculated, and the m can satisfy the following formula (1.1):
m＝log2X+log2m; formula (1.1)
Wherein, X represents the number of constellation points (constellation points) in a constellation mapping manner when the network device employs spatial modulation, and M represents the number of antennas that can be connected to each radio frequency chain in the network device. Then, serial-to-parallel converting the channel-coded bit stream according to m to obtain a first vector group, where each m bits in the channel-coded bit stream may be transposed into a bit vector, and the bit vector may include 1 column and m rows of m bits.
For example, as shown in fig. 4, when the channel-coded bit stream is 10011101 and m obtained by the above equation (1.1) is 4, 1001 may be transposed to obtain a first bit vector
Transpose 1101 to obtain a second bit vector may be
The first bit vector and the second bit vector may constitute a first vector group, and the first vector group may be
In this embodiment, the network device may map each bit vector in the first vector group into a corresponding symbol vector through spatial modulation, and the symbol vectors obtained through mapping form the second vector group.
In the embodiment of the present application, each symbol vector in the second vector group may correspond to a frequency bin, and each symbol vector may include 1 column and M rows of M symbols, where there may be only one non-zero symbol in the M symbols. The M corresponds to the number of antennas that can be connected by one rf chain in the network device. For example, in a network device, one rf chain can connect 2 antennas, and each symbol vector may include 2 symbols, i.e., 1 column and 2 rows.
In the embodiment of the present application, still following the above example, as shown in fig. 4, the first bit vector in the first vector group can be divided into
Spatially modulated and mapped to a first symbol vector
Second bit vectors in the first vector group
Spatially modulated and mapped to a second symbol vector
The first symbol vector
And a second symbol vector
Can form a second vector group
In the embodiment of the present application, the following method can be adopted for one bit vector to map into one symbol vector:
set one bit vector as
The network device may map m bits of the bit vector to one symbol.
In the embodiment of the present application, it is assumed that the symbol obtained after mapping is XiSaid X isiX in (A) represents a symbol to be transmitted, said XiI in (a) represents the frequency point at which the symbol X is transmitted.
In the embodiment of the present application, the X may be calculated according to a part of m bits in a bit vector, and the other part of m bits calculates i. For example, when 4 bits are included in the bit vector and Binary Phase Shift Keying (BPSK) modulation is adopted, X may be calculated by two bits of the 4 bits, and i may be calculated by the last two bits.
In the embodiment of the present application, the obtained symbol vector is set to
The M is the number of antennas which can be connected by one radio frequency chain in the network equipment, the M elements can correspond to the M antennas, data corresponding to the symbol 1 can be sent on the antenna 1, data corresponding to the symbol 2 can be sent on the antenna 2, and so on, and data corresponding to the symbol M is sent on the antenna M. As can be seen from the above discussion, m bits may be included in one bit vector, and in the spatial modulation, m bits are mapped to one symbol, and it can be seen that each symbol vector may include only one non-zero element.
Step S302: the network device interleaves the symbol vectors in the second vector group to obtain a third vector group.
In this embodiment, the network device may swap positions of a plurality of symbol vectors in the second vector group according to a preset rule to obtain a third vector group.
In this embodiment of the application, it is set that the second vector group includes N symbol vectors, which are the first symbol vector and the second symbol vector respectively, and so on in sequence until the nth symbol vector, and the preset rule may be that positions of the ith symbol vector and the N-i +1 th symbol vector are exchanged in the second vector group, where i takes a value from 1 to N in sequence, and N is a value greater than 1. As shown in fig. 5, N is set to 4, that is, the second vector group includes 4 symbol vectors, which are a first symbol vector, a second symbol vector, a third symbol vector, and a fourth symbol vector. According to the rule, the first symbol vector and the fourth symbol vector may be exchanged in position in the second vector group, and the second symbol vector and the third symbol vector may be exchanged in position to obtain the third vector group.
In this embodiment, the predetermined rule may also be that positions of adjacent symbol vectors in the second vector group are exchanged to obtain a third vector group, for example, as shown in fig. 6, the second vector group includes 4 symbol vectors, which are the first symbol vector, the second symbol vector, the third symbol vector and the fourth symbol vector, respectively. The first symbol vector may be swapped in position with the second symbol vector, and the third symbol vector may be swapped in position with the fourth symbol vector to obtain a third set of vectors.
It should be noted that the above explanation of the preset rule is only an illustrative explanation and is not a limitation of the present application. In this application, the rule of exchanging the positions of the symbol vectors in the second vector group to obtain the third vector group is within the scope of the present application, and the rule may also be referred to as condition/manner/algorithm, etc.
Step S303: and the network equipment sequentially performs inverse Fourier transform, digital-to-analog conversion and modulation on the third vector group to obtain data to be transmitted. The modulation may be analog modulation.
As can be seen from the above discussion, the third vector group may include a plurality of symbol vectors, each symbol vector corresponds to a frequency point, and each symbol vector includes 1 column and M rows, where M represents the number of transmit antennas that can be connected to one radio frequency chain in the network device. Accordingly, the data to be transmitted can also be divided into a plurality of data blocks, and each data block to be transmitted corresponds to one symbol vector in the third vector group. For example, the third vector includes 2 symbol vectors, which are the first symbol vector and the second symbol vector, respectively, and the data to be transmitted may also correspond to two, which are the first data to be transmitted and the second data to be transmitted, respectively. The first data to be transmitted is obtained by performing inverse fourier transform, digital-to-analog conversion and modulation on the first symbol vector, and the second data to be transmitted is obtained by performing inverse fourier transform, digital-to-analog conversion and modulation on the second symbol vector.
Step S304: and the network equipment sends the data to be sent, and the terminal equipment receives the data to be sent.
In this embodiment of the present application, the network device may first determine a symbol vector corresponding to data to be transmitted. And then determining a transmitting antenna and a frequency point corresponding to each symbol in each symbol vector, and finally sending the symbol to be sent on the corresponding antenna and frequency point.
For example, in a network device, a radio frequency chain can be connected to two antennas, a first antenna and a second antenna. The number of data to be transmitted is two, namely first data to be transmitted and second data to be transmitted respectively, and the symbol vector corresponding to the first data to be transmitted is
The symbol vector corresponding to the second data to be sent is
Then the network device may send the first data to be sent at frequency point i of the first antenna and send the second data to be sent at frequency point j of the second antenna.
Step S305: and the terminal equipment sequentially demodulates, converts the analog data into the digital data and performs Fourier transform on the data to be transmitted so as to obtain a fourth vector group. The fourth vector group comprises a plurality of symbol vectors, and each symbol vector comprises M symbols. The contents of the fourth vector set are the same as the contents of the third vector set.
In this embodiment, the terminal device may obtain the M in the following manner:
the first method comprises the following steps: the terminal equipment can acquire the M through channel detection;
and the second method comprises the following steps: the terminal device may obtain the M through a signaling sent by the network device.
In this embodiment of the present application, the terminal device may first detect an antenna for transmitting data to be transmitted in the network device; then receiving data to be sent by a corresponding antenna; then, the data to be transmitted is demodulated, analog-to-digital converted and Fourier transformed in sequence to obtain the symbol to be processed. And finally, obtaining symbol vectors according to the symbols to be processed, wherein the symbol vectors can form a fourth vector group.
In the embodiment of the present application, the symbol vector may include 1 column, M rows, and M symbols, and there is only one non-zero symbol in the M symbols, where the non-zero symbol corresponds to the symbol to be processed, and a position of the symbol to be processed in the symbol vector corresponds to an antenna to which the symbol to be processed corresponds. For example, the network device sends a data through the antenna 1, and the data is processed to obtain a symbol to be processed, where the position of the symbol to be processed in the symbol vector is the first row.
Step S306: and the terminal equipment de-interleaves the symbol vectors in the fourth vector group to obtain a fifth vector group.
In this embodiment of the application, the terminal device may exchange the symbol vectors in the fourth vector group according to an inverse operation of the preset rule in step S302 to obtain a fifth vector group. The content of the fifth vector set is the same as the content of the second vector set.
Step S307: and the terminal equipment performs spatial demodulation on the fifth vector group according to the number M of antennas which can be connected with each radio frequency chain in the network equipment to obtain a sixth vector group, wherein the sixth vector group comprises a plurality of bit vectors. The contents of the sixth vector group are the same as the contents of the first vector group.
In this embodiment, each symbol vector in the fifth vector group may be spatially demodulated to obtain a bit vector. In the embodiment of the present application, M symbols in each symbol vector may be mapped to M bits to obtain a corresponding bit vector. For the calculation formula of m, see the above formula (1.1).
In this embodiment, the terminal device may perform parallel-to-serial conversion on the sixth vector group to obtain a bit stream to be processed. The terminal device may process the bit stream to be processed according to a communication protocol between the network device and the terminal device, for example, under one communication protocol, the terminal device may detect whether transmission of the bit stream to be processed is correct, and reply an ACK confirmation message if transmission is correct, or reply a NACK confirmation message if transmission is incorrect.
As can be seen from the above, in the embodiment of the present application, first, a network device may perform spatial modulation on a first vector group according to M to obtain a second vector group, where the second vector group may include a plurality of symbol vectors, and each symbol vector corresponds to a frequency point; then interleaving the symbol vectors in the second vector group to obtain a third vector group; and finally, sequentially performing inverse Fourier transform, digital-to-analog conversion and modulation on the third vector group to obtain and send the data to be sent. In the embodiment of the application, the symbol vectors are directly interleaved, and each symbol vector corresponds to a frequency point, so that the frequency domain fading can be resisted more directly and more effectively. Especially when the interleaving of the symbol vectors is combined with the channel coding, the error correction capability of the channel coding can be fully exerted, and the capability of the MIMO system for resisting frequency selective fading is further improved.
Based on the network device provided in fig. 1, and it is set in fig. 1 that one rf chain can be connected to M antennas, and the rf chain is connected to only one of the M antennas at any time. As shown in fig. 7, the present application further provides a communication method of a network device, and in the flow of the communication method shown in fig. 7, the first vector group in the flow shown in fig. 5 can be obtained through the processing of steps S701, S702, and S703. As shown in fig. 7, the method includes:
step S701: the network device performs scrambling (scrambling) and channel coding on a bit stream to be transmitted in sequence.
For convenience of description, a bit stream which is subjected to scrambling and channel coding may be referred to as a first bit stream, and bits included in the first bit stream may be referred to as first bits.
Step S702: the network device transforms a block N according to a first bitstream and a Fast Fourier Transform (FFT)FFTThe size of the block results in a plurality of FFT blocks.
In the embodiment of the present application, the network device may be NFFTTaking block as unit, splitting the first bit stream to obtain multiple FFT blocks, and each FFT block includes NFFTThe first bit.
In the embodiment of the application, N isFFTCan be 256, 512, 1024, etc., e.g., when N isFFTWhen the size of (2) is 256, the network device may split the first bit stream by 256 units to obtain a plurality of FFT blocks, and each FFT block may include 256 first bits.
Step S703: the network equipment performs zero padding operation and serial-to-parallel conversion on the FFT block according to the size of the FFT block and the size of the spatial modulation mapping bit block to obtain a first vector group, wherein the first vector group comprises NFFTAnd each symbol column vector comprises m elements, and m represents the size of the spatial modulation mapping bit block.
In an example of the present application, the network device may determine, according to a size of an FFT block and a size m of a spatial modulation mapping bit block, a number k of zero padding required for the FFT block; and when the k is larger than zero, the network equipment performs zero padding operation on the FFT block, and then performs serial-parallel conversion on the zero-padded FFT block to obtain a first vector group. And if the k is equal to zero, directly carrying out serial-parallel conversion on the FFT block to obtain a first vector group.
In another example of the present application, the network device may first perform serial-to-parallel conversion on the FFT block to obtain a first vector group; then determining the number k of the first vector group needing zero padding according to the size of the FFT block and the size m of the spatial modulation mapping bit block; the network device performs a zero padding operation on the first vector group when k is greater than zero, and does not perform the zero padding operation on the first vector group any more if k is equal to zero.
In the present application, the number k of zero padding required for the FFT block may be determined according to the following formula (1.2):
k＝m-mod(NFFTm), said k being greater than or equal to zero; formula (1.2)
Wherein said mod (N)FFTM) represents NFFTOperation on m taking the remainder, NFFTRepresents the size of the FFT block and m represents the size of the block of spatial modulation mapping bits.
In the present application, the size m of the spatial modulation mapping bit block can be referred to the above formula (1.1);
step S704: the network device performs spatial modulation symbol mapping on the first vector group to obtain a second vector group, wherein the second vector group comprises a plurality of symbol vectors, and each symbol vector comprises a non-zero symbol.
Step S705: and the network equipment interweaves the symbol vectors in the second vector group to obtain a third vector group.
In an example of the present application, when the second vector group includes an even number of symbol vectors, the network device may interleave the second vector group in the following manner: and exchanging the position of the first symbol vector and the last symbol vector in the second vector group, exchanging the position of the second symbol vector and the position of the penultimate symbol vector, and the like until the middle two symbol vectors in the second vector group are exchanged. For example, the second vector group includes 4 symbol vectors, which are the first symbol vector, the second symbol vector, the third symbol vector and the fourth symbol vector, respectively, then the network device may swap positions of the first symbol vector and the fourth symbol vector in the second vector group, and swap positions of the second symbol vector and the third symbol vector to obtain the third vector group.
And when the second vector group comprises an odd number of symbol column vectors, the network device may interleave the second vector group as follows: exchanging the position of the first symbol vector and the last symbol vector in the second vector group, exchanging the position of the second symbol vector and the position of the last symbol vector, and sequentially carrying out type conversion, wherein the symbol column vector positioned in the middle position keeps the position unchanged. For example, the second vector group includes 5 symbol vectors, which are the first symbol vector, the second symbol vector, the third symbol vector, the fourth symbol vector and the fifth symbol vector, respectively, then the network devices may exchange the positions of the first symbol vector and the fifth symbol vector, the positions of the second symbol vector and the fourth symbol vector, and the position of the third symbol vector is kept unchanged, so as to obtain the third vector group.
Step S706: the network equipment performs inverse Fourier transform, digital-to-analog conversion and modulation on the third vector group to obtain data to be sent;
step S707: and the network equipment transmits the data to be transmitted.
Step S708: and the terminal equipment obtains the bit stream sent by the network equipment according to the data to be sent.
In the embodiment of the application, the receiving antenna of the terminal device can be set as
Wherein N isRxIs the number of receive antennas. The signal of the data to be transmitted received by the terminal device can be expressed as the following equation (1.3):
wherein the column vector
Representing the channel response from the jth transmit antenna to all receive antennas, column vectors
Representing white gaussian additive noise with zero mean unit variance.
In the embodiment of the present application, a column vector h of the channel matrix may be defined according to the received signal yjAt an angle alpha to the received signal yjSaid α isjIt can be specifically represented by the following formula (1.4):
wherein, | | · | | is a two-norm operation.
In the embodiment of the present application, assuming that the index number of the detected antenna is r, r can be expressed by the following formula (1.5):
wherein σ2Representing the variance of the noise, I representing the identity matrix, (-)-1An inversion operation of the representation matrix;
in this embodiment, the searched transmit vector x may be first de-symbol interleaved into x', then inversely mapped into a transmit bit block m (i.e., the FFT block), and finally the FFT blocks are combined and converted into a bit stream sent by a user.
In the embodiment of the present application, how to deinterleave the transmission vector x into x' corresponds to the above interleaving process, if the positions of adjacent symbol vectors are exchanged for the symbol vectors in the interleaving process of the network device, correspondingly, the positions of adjacent symbol vectors are also interleaved at the terminal device side, and the deinterleaving is performed. Similarly, if in the interleaving process of the network device, the position exchange of the first symbol vector and the last symbol vector is performed on the symbol vectors, the position exchange of the second symbol vector and the last-but-one symbol vector is performed on the second symbol vector, and so on until the position exchange of the intermediate symbol vector, correspondingly, the position exchange of the first symbol vector and the last symbol vector is also performed on the terminal device side, the position exchange of the second symbol vector and the last-but-one symbol vector is performed on the second symbol vector, and so on until the position exchange of the intermediate symbol vector is performed.
It should be noted that the methods provided in fig. 3 and fig. 7 can be applied to a multi-antenna system, which can be a Wireless Local Area Network (WLAN) system and a cellular mobile communication system.
In the embodiment of the present application, when the methods provided in fig. 3 and fig. 7 are applied to a WLAN system, the network device in fig. 3 and fig. 7 is a device that provides a WIFI network in a certain coverage area, such as an Access Point (AP). The terminal device is a device, such as a workstation (STA), that accesses the WIFI network within a coverage area of the WIFI network.
In the embodiment of the present application, when the methods provided in fig. 3 and fig. 7 are applied to a cellular mobile communication system, the network device is an apparatus deployed in a radio access network to provide a wireless communication function for a user equipment, such as various forms of macro base stations, micro base stations (also referred to as small stations), relay stations, access points, and the like.
In the embodiment of the application, channel coding and symbol interleaving are combined, so that the error correction capability of the channel coding can be fully exerted, and the capability of the MIMO system for resisting frequency selective fading is further improved.
Based on the same inventive concept, as shown in fig. 8, the present application further provides a network device 800, where the network device 800 includes a processor 801, a radio frequency chain 802 and a plurality of antennas 803, the radio frequency chain 802 is connected to the plurality of antennas 803, and the radio frequency chain 802 is connected to only one of the plurality of antennas 803 at any time.
A processor 801, configured to perform spatial modulation on a first vector group according to the number of the multiple antennas to obtain a second vector group, interleave symbol vectors in the second vector group to obtain a third vector group, and perform inverse fourier transform, digital-to-analog conversion and modulation on the third vector group to obtain data to be transmitted, where the number of the multiple antennas is M, the first vector group includes multiple bit vectors, the second vector group includes multiple symbol vectors, and each of the multiple symbol vectors includes M symbols;
the processor may include a central processing unit and a radio frequency chip, and the central processing unit may be a network processor or an SOC.
And a radio frequency chain 802, configured to transmit the data to be transmitted through multiple antennas 803.
In this embodiment, the rf chain 802 may be connected to one of the antennas 803, and transmit data to be transmitted through the connected antenna, and then switch to be connected to another antenna of the antennas 803, and transmit data to be transmitted through the connected antenna.
For the specific processing procedures of the processor 801, the radio frequency chain 802 and the antenna 803, reference may be made to the description of the embodiments in fig. 3 and fig. 7, which are not described herein again.
Based on the same concept, as shown in fig. 9, the present application further provides a terminal device 900, where the terminal device 900 includes a transceiver 901 and a processor 902;
a transceiver 901, configured to receive data to be transmitted;
a processor 902, configured to demodulate, perform analog-to-digital conversion, and perform fourier transform on the data to be sent to obtain a first vector group, deinterleave symbol vectors in the first vector group to obtain a second vector group, and perform spatial demodulation on the second vector group according to a number M of antennas that can be connected to a radio frequency chain in the network device to obtain a third vector group, where the first vector group includes a plurality of symbol vectors, each of the plurality of symbol vectors includes M symbols, and the third vector group includes a plurality of bit vectors.
For specific processing procedures of the transceiver 901 and the processor 902, reference may be made to the description of the embodiments in fig. 3 and fig. 7, and details are not repeated here.
Based on the same concept, as shown in fig. 10, the present application further provides a communication apparatus 1000, which is applied to a device including a radio frequency chain and a plurality of antennas, wherein the radio frequency chain is capable of being connected to the plurality of antennas, and the radio frequency chain is connected to only one of the plurality of antennas at any time; the communication device 1000 includes a processing unit 1001 and a transceiving unit 1002.
The processing unit 1001 is configured to perform spatial modulation on a first vector group according to the number of the multiple antennas to obtain a second vector group, interleave symbol vectors in the second vector group to obtain a third vector group, and perform inverse fourier transform, digital-to-analog conversion, and modulation on the third vector group to obtain data to be transmitted, where the number of the multiple antennas is M, the first vector group includes multiple bit vectors, the second vector group includes multiple symbol vectors, and each symbol vector in the multiple symbol vectors includes M symbols;
the transceiving unit 1002 is configured to transmit the data to be transmitted.
For the specific processing procedures of the transceiver 1001 and the transceiver 1002, reference may be made to the description of the embodiments in fig. 3 and fig. 7, which will not be described herein again.
Based on the same concept, as shown in fig. 11, the present application further provides a communication apparatus 1100, where the communication apparatus 1100 includes a transceiver unit 1101 and a processing unit 1102;
the transceiver unit 1101 is configured to receive data to be transmitted;
the processing unit 1102 is configured to demodulate, perform analog-to-digital conversion, and perform fourier transform on the data to be transmitted to obtain a first vector group, deinterleave symbol vectors in the first vector group to obtain a second vector group, and perform spatial demodulation on the second vector group according to the number M of antennas that can be connected to a radio frequency chain in the network device to obtain a third vector group, where the first vector group includes a plurality of symbol vectors, each of the plurality of symbol vectors includes W symbols, and the third vector group includes a plurality of bit vectors.
For specific processing procedures of the transceiver 1101 and the processing unit 1102, reference may be made to the description of the embodiments in fig. 3 and fig. 7, which is not described herein again.
Based on the same concept, as shown in fig. 12, the present application also provides a communication system 1200, where the communication system 1200 may include a network device 1201 and a terminal device 1202.
The network device 1201 is configured to perform spatial modulation on the first vector group according to the number of the multiple antennas to obtain a second vector group, interleave the symbol vectors in the second vector group to obtain a third vector group, perform inverse fourier transform, digital-to-analog conversion, and modulation on the third vector group to obtain data to be transmitted, and transmit the data to be transmitted.
The terminal device 1002 is configured to receive data to be transmitted, demodulate, perform analog-to-digital conversion, and perform fourier transform on the data to be transmitted to obtain a first vector group, deinterleave symbol vectors in the first vector group to obtain a second vector group, and perform spatial demodulation on the second vector group according to the number M of transmitting antennas that can be connected to a radio frequency chain in the network device to obtain a third vector group.
The present application also provides a computer-readable storage medium having stored therein instructions, which when run on a computer, cause the computer to perform the method of the embodiment shown in fig. 3 or fig. 7 described above.
Those skilled in the art will recognize that, in one or more of the examples described above, the functions described in this invention may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only examples of the present invention, and are not intended to limit the scope of the present invention, and any modifications made on the basis of the technical solutions of the present invention should be included in the scope of the present invention.
Claims (15)
1. A communication method of a network device, wherein the network device includes a radio frequency chain, the radio frequency chain is capable of being connected to a plurality of antennas, and the radio frequency chain is connected to only one of the plurality of antennas at any time, the method comprising:
the network device performs spatial modulation on a first vector group according to the number of the plurality of antennas to obtain a second vector group, wherein the number of the plurality of antennas is M, the M is an integer power of 2, the first vector group comprises a plurality of bit vectors, the second vector group comprises a plurality of symbol vectors, and each symbol vector in the plurality of symbol vectors comprises M symbols;
the network equipment interweaves symbol vectors in the second vector group to obtain a third vector group;
the network equipment performs inverse Fourier transform, digital-to-analog conversion and modulation on the third vector group to obtain data to be sent;
and the network equipment transmits the data to be transmitted.
2. The method of claim 1, wherein the network device interleaves the symbol vectors in the second vector group to obtain a third vector group, comprising:
and the network equipment exchanges the positions of a plurality of symbol vectors in the second vector group according to a preset rule to obtain the third vector group.
3. The method according to claim 2, wherein the second vector group comprises N symbol vectors, which are a first symbol vector, a second symbol vector, and so on, up to an nth symbol vector;
the preset rule is that the positions of the ith symbol vector and the (N-i + 1) th symbol vector are sequentially exchanged in the second vector group, wherein i is sequentially valued from 1 to N, and N is an integer greater than 1.
4. The method according to any one of claims 1 to 3, wherein the network device further comprises a processor and a radio frequency chip, wherein the processor is connected to the radio frequency chip, and the radio frequency chip is connected to the radio frequency chain.
5. A communication method of a terminal device, the method comprising:
the terminal equipment receives data to be sent;
the terminal equipment demodulates, performs analog-to-digital conversion and performs fourier transform on the data to be transmitted to obtain a first vector group, where the first vector group includes a plurality of symbol vectors, and each symbol vector in the plurality of symbol vectors includes M symbols;
the terminal equipment de-interleaves the symbol vectors in the first vector group to obtain a second vector group;
and the terminal equipment performs spatial demodulation on the second vector group according to the number M of antennas which can be connected by the radio frequency chain in the network equipment to obtain a third vector group, wherein the third vector group comprises a plurality of bit vectors.
6. The method of claim 5, wherein the terminal device deinterleaves the symbol vectors in the first vector group to obtain a second vector group, comprising:
and the terminal equipment exchanges the positions of the symbol vectors in the first vector group according to a preset rule to obtain a second vector group.
7. The method according to claim 6, wherein the first vector group comprises N symbol vectors, which are a first symbol vector, a second symbol vector, and so on, up to an nth symbol vector;
the preset rule is that the positions of the ith symbol vector and the (N-i + 1) th symbol vector are exchanged in the first vector group, wherein i takes values from 1 to N in sequence, and N is an integer greater than 1.
8. A network device, comprising a processor, a radio frequency chain and a plurality of antennas, wherein the radio frequency chain is capable of being connected to the plurality of antennas, and the radio frequency chain is connected to only one of the plurality of antennas at any time;
the processor is configured to perform spatial modulation on a first vector group according to the number of the multiple antennas to obtain a second vector group, interleave symbol vectors in the second vector group to obtain a third vector group, and perform inverse fourier transform, digital-to-analog conversion and modulation on the third vector group to obtain data to be transmitted, where the number of the multiple antennas is M, the M is an integer power of 2, the first vector group includes multiple bit vectors, the second vector group includes multiple symbol vectors, and each symbol vector in the multiple symbol vectors includes M symbols;
and the radio frequency chain is used for transmitting the data to be transmitted through the plurality of antennas.
9. The device of claim 8, wherein the processor, when interleaving the symbol vectors of the second vector group to obtain a third vector group, is specifically configured to:
and exchanging the positions of a plurality of symbol vectors in the second vector group according to a preset rule to obtain the third vector group.
10. The apparatus according to claim 9, wherein the second vector group comprises N symbol vectors, which are a first symbol vector, a second symbol vector, and so on, up to an nth symbol vector;
the preset rule is that the positions of the ith symbol vector and the (N-i + 1) th symbol vector are sequentially exchanged in the second vector group, wherein i is sequentially valued from 1 to N, and N is an integer greater than 1.
11. A terminal device, characterized in that the device comprises:
a transceiver for receiving data to be transmitted;
a processor, configured to demodulate, perform analog-to-digital conversion, and perform fourier transform on the data to be sent to obtain a first vector group, deinterleave symbol vectors in the first vector group to obtain a second vector group, and perform spatial demodulation on the second vector group according to a number M of antennas that can be connected to a radio frequency chain in a network device to obtain a third vector group, where the first vector group includes a plurality of symbol vectors, each of the plurality of symbol vectors includes M symbols, and the third vector group includes a plurality of bit vectors.
12. The device of claim 11, wherein the processor, when deinterleaving the symbol vectors in the first vector group to obtain a second vector group, is specifically configured to:
and exchanging the positions of the symbol vectors in the first vector group according to a preset rule to obtain a second vector group.
13. The apparatus according to claim 12, wherein the first vector group comprises N symbol vectors, which are a first symbol vector, a second symbol vector, and so on, up to an nth symbol vector;
the preset rule is that the positions of the ith symbol vector and the (N-i + 1) th symbol vector are exchanged in the first vector group, wherein i takes values from 1 to N in sequence, and N is an integer greater than 1.
14. A computer-readable storage medium having stored therein instructions which, when run on a computer, cause the computer to perform the method of any one of claims 1 to 7.
15. A communication system, characterized in that the communication system comprises a network device according to any of claims 8 to 10 and a terminal device according to any of claims 11 to 13.
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