WO2018103477A1 - 一种时频分集拷贝方法、系统及存储介质 - Google Patents

一种时频分集拷贝方法、系统及存储介质 Download PDF

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Publication number
WO2018103477A1
WO2018103477A1 PCT/CN2017/109131 CN2017109131W WO2018103477A1 WO 2018103477 A1 WO2018103477 A1 WO 2018103477A1 CN 2017109131 W CN2017109131 W CN 2017109131W WO 2018103477 A1 WO2018103477 A1 WO 2018103477A1
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data
copy
copying
interleaver
interleavers
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English (en)
French (fr)
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刘宣
张海龙
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China Electric Power Research Institute Co Ltd CEPRI
State Grid Corp of China SGCC
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China Electric Power Research Institute Co Ltd CEPRI
State Grid Corp of China SGCC
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Priority to GB1805149.0A priority Critical patent/GB2562374B/en
Priority to DE112017000221.4T priority patent/DE112017000221T5/de
Publication of WO2018103477A1 publication Critical patent/WO2018103477A1/zh
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H04B3/542—Systems for transmission via power distribution lines the information being in digital form
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H04B3/548—Systems for transmission via power distribution lines the power on the line being DC
    • 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
    • H04L1/0057—Block codes
    • H04L1/0058—Block-coded modulation
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2626—Arrangements specific to the transmitter only
    • H04L27/2627—Modulators
    • H04L27/2634—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
    • H04L5/0008—Wavelet-division
    • 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
    • H04L5/0044—Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH
    • H04L5/0046—Determination of the number of bits transmitted on different sub-channels

Definitions

  • the present invention relates to the field of power line carrier communication technologies, and, more particularly, to a time-frequency diversity copy method, system, and storage medium.
  • Power line carrier communication is a wired communication technology that utilizes power wiring to transmit and receive communication signals. Since the power line network is widely distributed, the use of the power line as a communication medium does not require rebuilding the communication network in the indoor perforated wiring, and has the advantages of low cost, convenient connection, and the like, and has attracted more and more attention in the smart grid and broadband access.
  • Orthogonal Frequency Division Multiplexing is a spread spectrum technique that subdivides the available transmission channel bandwidth into a plurality of discrete channels or carriers that are overlapping and orthogonal to each other. Data is transmitted in the form of symbols having a particular duration and including a certain number of carrier frequencies.
  • the data transmitted by these OFDM carriers can be encoded by a conventional scheme such as Binary Phase Shift Keying (BPSK) or Quadrature Phase Shift Keying (QPSK).
  • BPSK Binary Phase Shift Keying
  • QPSK Quadrature Phase Shift Keying
  • the communication channel is the basis of communication. Like wireless communication, the performance of power line communication is mainly restricted by the power line communication channel.
  • the low-voltage power network is not designed to transmit high-speed data.
  • the components that make up the power grid are based on the minimum loss of transmitted energy and ensure reliable transmission of low-frequency current. Therefore, when transmitting signals on the low-voltage line, impulse noise of the error burst and delay spread of the frequency selective fading may occur on the channel, so that the receiving end cannot correctly demodulate the transmitted signal, so The use of diversity technology is necessary.
  • the present invention provides a time-frequency diversity copy method, system, and storage medium.
  • An embodiment of the present invention provides a time-frequency diversity copy method, where the method includes:
  • the original data is subjected to time-frequency diversity copying based on the number of copies and the parameters of the time-frequency diversity copy.
  • the determining, by using the carrier mapping table index and the determined number of interleavers, parameters for performing time-frequency diversity copying on the original data includes:
  • the number of bits of the last portion of data to be copied is determined according to the length of the original data, the determined number of orthogonal frequency division multiplexing symbols, and the number of bits of data to be copied per portion.
  • the carrier mapping table index includes: a coding rate of the physical layer, a copy number, a physical block size, and a length of the original data that can be transmitted.
  • determining the number of interleavers according to the number of times of copying in the obtained carrier mapping table index includes:
  • the method further includes: determining a shift parameter of the time-frequency diversity copy according to a relationship between a bit number of the last orthogonal frequency division multiplexing symbol, a number of bits of the last part of the data to be copied, and a copy number;
  • BitsInLastOFDM ⁇ BitsPerPart
  • shift parameter cyclicshift [0,0,0,0]
  • shift parameter 2 ⁇ BitsPerPart ⁇ BitsInLastOFDM ⁇ 3 ⁇ BitsPerPart
  • shift parameter cyclicshift [0,0,0,0]
  • the determining, according to the ratio of the number of subcarriers actually used and the number of interleavers corresponding to the number of times of copying, determining the number of subcarriers corresponding to each interleaver including:
  • Time-frequency diversity copying of the original data is performed based on the number of copies, the shift parameter, an interleave address of the interleaver, and an encoding rate of a physical layer in the carrier mapping table index.
  • the number of subcarriers corresponding to the actual use corresponds to the number of times of copying.
  • the ratio of the number of interleaver determines the number of subcarriers corresponding to each interleaver, including:
  • InterStep indicates the interleaving offset step size
  • CarriersPerInterleaver indicates the number of subcarriers corresponding to each interleaver during copying
  • InterNum indicates the number of interleavers corresponding to the number of copies. Indicates that the whole is removed;
  • the interleave step size of each interleaver is determined according to the interleave offset step size, and the corresponding relationship is as follows:
  • InterShiftStep is equal to 0;
  • Calculating the interleave address of each interleaver according to the interleaving step includes:
  • Each interleaver uses the way of travel list when interleaving. First, the original address is stored in a matrix of N rows and M columns according to the way of travel, and the elements in the matrix are read out in the order of the columns. After reading, each interleaver is cyclically shifted to obtain the final interleaving result.
  • the specific calculation formula is as follows:
  • M(i) represents the number of matrix columns when the i-th interleaver is interleaved
  • InterShiftStep represents the interleaving step size of the interleaver.
  • cyc(i) represents the cyclic shift parameter of the i-th interleaver
  • InterShiftStep represents the intersection The interweaving step of the weaver.
  • the time-frequency diversity copy of the original data is performed based on the number of copies, the shift parameter, an interleave address of the interleaver, and an encoding rate of a physical layer in the carrier mapping table index.
  • the copied portion is first shifted according to the shift parameter, where N is greater than 1;
  • the bits and subcarriers are mapped according to the coding rate of the physical layer.
  • the embodiment of the invention further provides a time-frequency diversity copy system, wherein the system comprises:
  • a data forming unit configured to acquire original data to be transmitted
  • the interleaver determining unit is configured to determine the number of interleavers according to the number of times of copying in the obtained carrier mapping table index;
  • a time-frequency diversity copy parameter determining unit configured to determine a parameter for performing time-frequency diversity copying on the original data based on the carrier mapping table index and the determined number of interleavers;
  • the time-frequency diversity copy unit is configured to perform time-frequency diversity copying on the original data based on the number of copies and the parameters of the time-frequency diversity copy.
  • the embodiment of the invention further provides a time-frequency diversity copy system, including:
  • a memory configured to store an executable program
  • the processor is configured to implement the time-frequency diversity copy method described above by executing an executable program stored in the memory.
  • the embodiment of the invention further provides a computer storage medium, which stores an executable program, and when the executable program is executed by the processor, implements the time-frequency diversity copy method described above.
  • the time-frequency diversity copying method, system and storage medium provided by the embodiments of the present invention perform time-frequency diversity copying for different data lengths, different modulation modes, and different copy times, and improve the system.
  • FIG. 1 is an optional flowchart of a time-frequency diversity copy method according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of an interleaver interleaving manner in an alternative embodiment of the present invention.
  • FIG. 4 is a schematic diagram of an embodiment of a time-frequency diversity copy according to an embodiment of the present invention.
  • FIG. 5 is a partial schematic diagram showing a mapping relationship between a bit and a carrier when time-frequency diversity copying is performed according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of simulation of a time-frequency diversity copy method based on orthogonal frequency division multiplexing according to an embodiment of the present invention
  • FIG. 7 is another schematic diagram of simulation of a time-frequency diversity copy method based on orthogonal frequency division multiplexing according to an embodiment of the present invention.
  • FIG. 8A is a schematic structural diagram of an optional structure of a time-frequency diversity copy system according to an embodiment of the present invention.
  • 8B is a structural diagram of a time-frequency diversity copy system based on orthogonal frequency division multiplexing according to an embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of an optional hardware component of a time-frequency diversity copy system according to an embodiment of the present invention.
  • the time-frequency diversity copy system acquires the original data to be transmitted; determines the number of interleavers according to the number of times of copying in the obtained carrier mapping table index; and based on the carrier mapping table index and the Determining the number of interleavers determines a parameter for performing time-frequency diversity copying on the original data; performing time-frequency diversity copying on the original data based on the number of copies and the parameters of the time-frequency diversity copy.
  • FIG. 1 is an alternative flow chart of a time-frequency diversity copy method in accordance with an embodiment of the present invention. As shown in FIG. 1, the implementation of the time-frequency diversity copy method is based on orthogonal frequency division multiplexing.
  • the physical layer receives the medium access control layer information and generates original data that the physical layer needs to transmit.
  • the medium access control layer information received by the physical layer includes a carrier mapping table index, where the carrier mapping table index includes: a coding rate of the physical layer, a copy number, a physical block size, and can calculate a physical layer transmittable original according to the physical block size. Data length.
  • the frequency band is 0, the carrier mapping table index is 2, the coding rate is 2, QPSK is used, the number of copies is 5, the number of available subcarriers is 411, the physical block is 136, and the physical layer can transmit data length N_data. It is 1088.
  • step S102 the number of interleavers is determined according to the number of times of copying.
  • the number of interleavers is determined according to the number of times of copying. When the number of times of copying is 2, the number of interleavers is 8, and the number of interleavers per copy is 4.
  • the number of times of copying is 4, the number of interleavers is 8 times, the number of interleavers per copy is 2; when the number of copies is 5, the number of interleavers is 10, the number of interleavers per copy is 2; when the number of copies is 7 times, interleaving The number of devices is 14, and the number of interleavers per copy is two; and when the number of copies is 11, the number of interleavers is 11, and the number of interleavers per copy is one. In this embodiment, since the number of copies is 5, the number of interleavers should be 10, and the number of interleavers per copy is two.
  • step S103 parameters of the time-frequency diversity copy are calculated according to the medium access control layer information and the determined number of interleavers.
  • the parameters include: the number of subcarriers actually used in copying, the number of carriers per part of data, the number of bits per part of data, the number of orthogonal frequency division multiplexing symbols required, and each orthogonal frequency division complex.
  • the number of bits of the symbol the number of bits of the last orthogonal frequency division multiplexing symbol, the number of subcarriers corresponding to each interleaver, and the number of bits of the last portion of data.
  • N_real_carrier N_real_carrier
  • N_real_carrier indicates the number of subcarriers actually used for copying
  • InterNum indicates the number of interleavers corresponding to the number of copies
  • N_carrier indicates the number of subcarriers that can be used. In the embodiment of the present invention, the number of subcarriers actually used is
  • CarriersPerPart indicates the number of carriers per part when copying
  • N_real_carrier indicates the number of subcarriers actually used for copying
  • N_copies indicates the number of copies. Indicates that the whole is removed.
  • the original data is divided into five parts, and the number of carriers in each part is
  • BitsPerPart represents the number of bits per part when copying
  • BPC represents the physical layer coding
  • Rate, CarriersPerPart indicates the number of carriers per part when copying.
  • N_symbol represents the number of orthogonal frequency division multiplexing symbols required for copying
  • N_data represents the original data length
  • BitsPerPart represents the number of bits per part of the copy
  • the original data length is 1088
  • the number of bits per part is 164
  • the number of OFDM symbols required for copying is 7.
  • BitsPerSymbol BPC*N_real_carrier (5)
  • BitsPerSymbol represents the number of bits of each orthogonal frequency division multiplexing symbol when copying
  • BPC represents the physical layer encoding rate
  • N_real_carrier represents the number of subcarriers actually used in copying.
  • BitsInLastOFDM represents the number of bits of the last orthogonal frequency division multiplexing symbol
  • N_data represents the original data length
  • BitsPerSymbol represents the number of bits of each orthogonal frequency division multiplexing symbol when copying
  • CarriersPerInterleaver indicates the number of subcarriers corresponding to each interleaver when copying
  • N_real_carrier indicates the number of subcarriers actually used for copying
  • InterNum indicates the number of interleavers corresponding to the number of copies.
  • BitsInLastPart
  • BitsInLastPart N_data-(N_symbol-1)*BitsPerPart (8)
  • BitsInLastPart represents the number of bits of the last part of the data when copying
  • N_data represents the original data length
  • N_symbol represents the number of orthogonal frequency division multiplexing symbols required for copying
  • BitsPerPart represents the number of bits per part of the copy.
  • step S104 it is determined whether the number of bits of the last part of data is greater than 0, and if so, step S105 is performed, otherwise, step S106 is performed.
  • step S105 is performed.
  • step S105 the length of the data to be added is calculated based on the number of bits per part of data at the time of copying and the number of bits of the last part of data, and a new data sequence is acquired.
  • the process of acquiring a new data sequence is as follows:
  • Step 1 Calculate the length of the data to be added, N_add, using equation (9):
  • N_add indicates the length of the data to be added
  • BitsPerPart indicates the number of bits per part of the copy
  • BitsInLastPart indicates the number of bits of the last part of the data at the time of copying.
  • Step 2 Add N_add length data for each copy, and add a policy: the first copy of the N_add length data is from the original data 1 to N_add bits, and the second copy of the N_add length data is from the original data (N_add+1) Up to 2N_add bits, and so on, until the Nth copy of the N_add length data comes from [(N-1)*N_add+1] to N*N_add bits of the original data.
  • Step 3 Update the data length N_data_actual by using formula (10).
  • the calculation formula is as follows:
  • N_data_actual represents the updated data length
  • N_data represents the original data length
  • N_add represents the data length to be added.
  • the parameters of the time-frequency diversity copy in the specific embodiment of the present invention are respectively: the number of subcarriers actually used in copying is 410, and each part of the data is The number of carriers is 82, the number of bits per part of data is 164, the number of orthogonal frequency division multiplexing symbols required is seven, and the number of bits of each orthogonal frequency division multiplexing symbol is 820, and the last one is positive.
  • the number of bits of the frequency division multiplexing symbol is 268, the number of subcarriers corresponding to each interleaver is 41, the number of bits of the last part of data is 104, and the new data length is 1148.
  • step S106 the shift parameter of the time-frequency diversity copy is calculated according to the number of copies and the number of bits of the last orthogonal frequency division multiplexing symbol.
  • the shift parameter cyclicshift 0;
  • step S107 the interleave offset step size is calculated according to the number of subcarriers and the number of interleavers corresponding to each interleaver at the time of copying, and the interleave step size of each interleaver is determined according to the interleave offset step size, and finally according to the interleaving step.
  • the interleave address of each interleaver is calculated long. The specific calculation method is as follows.
  • Step 1 Calculate the interleaving offset step InterStep using equation (11):
  • InterStep indicates the interleaving offset step size
  • CarriersPerInterleaver indicates the number of subcarriers corresponding to each interleaver during copying
  • InterNum indicates the number of interleavers corresponding to the number of copies.
  • the number of subcarriers corresponding to each interleaver is 41
  • the number of interleavers corresponding to the number of copies is 10. According to calculation, the interleave offset step size is 2.
  • Step 2 determining an interleaving step size of each interleaver according to an interleaving offset step, and the corresponding relationship is as follows under:
  • InterShiftStep is equal to 0;
  • the interleaving offset step size is 2, and the interleaving step size is also 2.
  • Step 3 Calculate the interleave address of each interleaver according to the interleaving step size, including:
  • Each interleaver uses the way of travel list when interleaving. First, the original address is stored in a matrix of N rows and M columns according to the way of travel, and the elements in the matrix are read out in the order of the columns. After reading, each interleaver is cyclically shifted to obtain the final interleaving result.
  • the specific calculation formula is as follows:
  • M(i) represents the number of matrix columns when the i-th interleaver is interleaved
  • InterShiftStep represents the interleaving step size of the interleaver.
  • cyc(i) represents the cyclic shift parameter of the i-th interleaver
  • InterShiftStep represents the interleaving step size of the interleaver.
  • FIG. 3 is a schematic diagram of an interleaver interleaving manner in an alternative embodiment of the present invention. As shown in FIG. 3, for the third interleaver, the number of columns M of the matrix when interleaving is 6, the number of rows N of the matrix is 7, and the cyclic shift parameter is 8, and the result of the interleaving output in FIG.
  • step S108 according to the number of times of copying, the time-frequency diversity copy is sequentially performed according to the shift parameter, the interleave address of the interleaver, and the coding rate of the physical layer.
  • sequentially performing the time-frequency diversity copy according to the shift parameter, the interleave address of the interleaver, and the encoding rate of the physical layer includes:
  • the copied portion is first shifted according to the shift parameter, where N is greater than 1;
  • the bits and subcarriers are mapped according to the coding rate of the physical layer.
  • FIG. 4 is a schematic diagram of an embodiment of time-frequency diversity copying in accordance with an embodiment of the present invention.
  • the copy is performed 5 times.
  • each part adopts the interleaving address of the interleaver 1, 2, and for the first part Part1, the copy result is P1_1(I1), P1_2( I2), P1_1 represents the first block of Part1, in the embodiment, 82 bits, P1_2 represents the second block of Part1, in the embodiment, also 82 bits, and I1 represents the final of Interleaver 1.
  • Interleaving address, I2 represents the final interleaving address of the interleaver 2, and for the second part, the copying result is P2_1(I1), P2_2(I2), P2_1 represents the first block of Part2, and P2_2 represents the second block of Part2,
  • the copy result is Pi_1(I1), Pi_2(I2), Pi_1 represents the first block of Part i, Pi_2 represents the second block of Part i; the second copy
  • the interleaving addresses of the interleavers 3, 4 are used for interleaving.
  • the second element of the shift parameter is 0, so no shifting is needed.
  • each part is interleaved, it is similar to the first copy, but only interleaved.
  • the address uses the output result of the interleaver 3, 4, as shown in FIG.
  • the copy result is P1_1 (I3), P1_2 (I4), and for the second part, the copy result is P2_1 (I3), P2_2(I4), for the i-th part of the second copy, the copy result is Pi_1(I3), Pi_2(I4); for the j-th copy, first according to the jth element in the shift parameter, The 7 parts that need to be copied are shifted, and each part is interleaved according to the output of the interleaver 2j-1, 2j until the end of the copy.
  • FIG. 5 is a partial schematic diagram showing a mapping relationship between a bit and a carrier when time-frequency diversity copying is performed according to an embodiment of the present invention.
  • the bits and subcarriers are mapped according to the BPC parameters. If the BPC is 1, each subcarrier can be mapped with 1 bit. If the BPC is 2, each subcarrier can be mapped with 2 bits. In this embodiment, the BPC is 2, as shown in FIG. 5, in the first block bit P3_1 of the third part of the first OFDM symbol, the mapping relationship between the bit and the subcarrier, when mapping, using the interleaver of the interleaver 1. Output I(1). In Figure 6, the bit number corresponding to P3_1 is 329-410.
  • the subcarrier number corresponding to the mapping should be 164+I(1,1), where I(I) 1,1) indicates the first interleaving result of the first interleaver output.
  • the corresponding subcarrier number of the mapping should be 164+I(1). m), where 1 ⁇ m ⁇ 41, and I(1, m) represents the mth interleaving result output by the first interleaver.
  • the bit and subcarrier mapping relationship of other parts is similar to that of FIG. 5 except that the corresponding interleaver is different when mapping.
  • the diversity copy is performed simultaneously in the time domain and the frequency domain, and the frequency domain is represented by copying the data to be transmitted on different subcarriers, and the time domain is represented by copying the data to be transmitted in different orthogonalities. Frequency division multiplexing symbols.
  • FIG. 6 is a schematic diagram of simulation of a time-frequency diversity copy method based on orthogonal frequency division multiplexing according to an embodiment of the present invention.
  • 7 is a time-frequency division based on orthogonal frequency division multiplexing according to an embodiment of the present invention.
  • the simulation conditions of FIG. 6 are: the bandwidth is 1.953 to 11.96 MHz, the number of available subcarriers is 411, the physical block is 136, the data length is 1088, the modulation mode is QPSK, and the copy is 5 times.
  • the bandwidth is 2.441 to 5.615 MHz
  • the number of available subcarriers is 131
  • the physical block is 136
  • the data length is 1088
  • the modulation mode is QPSK
  • the copy is 5 times.
  • the channel used in the simulation is the power line channel
  • the channel model is a 4-path fading channel.
  • the horizontal axis in Figs. 6 and 7 represents the signal-to-noise ratio in dB
  • the vertical axis represents the bit error rate.
  • the curve indicated by a circle represents a bit error rate curve of a non-diversity copy
  • the curve indicated by a square represents a bit error rate curve of the present invention. It can be seen from the simulation data of FIG. 6 and FIG. 7 that the embodiment of the present invention can provide higher diversity gain by using time-frequency diversity copy data and using non-diversity copy data, which is well against the frequency selectivity of the channel. The reliability of the time-frequency diversity copy system is greatly improved.
  • An embodiment of the present invention further provides a time-frequency diversity copy system.
  • An optional structure diagram of the system, as shown in FIG. 8A, includes:
  • the data forming unit 801 is configured to acquire original data to be transmitted
  • the interleaver determining unit 802 is configured to determine the number of interleavers according to the number of times of copying in the obtained carrier mapping table index;
  • the time-frequency diversity copy parameter determining unit 803 is configured to determine a parameter for performing time-frequency diversity copying on the original data based on the carrier mapping table index and the determined number of interleavers;
  • the time-frequency diversity copy unit 808 is configured to perform time-frequency diversity copying on the original data based on the number of copies and the parameters of the time-frequency diversity copy.
  • the time-frequency diversity copy system based on orthogonal frequency division multiplexing includes a data forming unit 801, an interleaver determining unit 802, a time-frequency diversity copy parameter determining unit 803, a data length determining unit 804, and a new data sequence determination.
  • a data forming unit 801 configured to receive media access control layer information through a physical layer, and generate original data that the physical layer needs to transmit;
  • An interleaver determining unit 802 configured to determine the number of interleavers according to the number of times of copying
  • the time-frequency diversity copy parameter determining unit 803 is configured to calculate a parameter of the time-frequency diversity copy according to the medium access control layer information and the determined number of interleavers, where the parameter includes the number of sub-carriers actually used during copying, and each The number of carriers of partial data, the number of bits per partial data, the number of required orthogonal frequency division multiplexing symbols, the number of bits per orthogonal frequency division multiplexing symbol, and the number of bits of the last orthogonal frequency division multiplexing symbol The number of subcarriers corresponding to each interleaver and the number of bits of the last part of data;
  • a data length determining unit 804 configured to determine whether the number of bits of the last part of the transmitted data is greater than 0;
  • a new data sequence determining unit 805 configured to calculate a length of data to be added according to the number of bits of each part of data at the time of copying and the number of bits of the last part of data, and acquire a new data sequence
  • a time-frequency diversity copy shift parameter calculation unit 806 configured to calculate a shift parameter of the time-frequency diversity copy according to the number of times of copying and the number of bits of the last orthogonal frequency division multiplexing symbol;
  • the interleaver interleave address calculation unit 807 is configured to calculate an interleave offset step size according to the number of subcarriers and the number of interleavers corresponding to each interleaver at the time of copying, and determine the interlace of each interleaver according to the interleave offset step size. Step size, and finally calculating the interleave address of each interleaver according to the interleaving step size;
  • the time-frequency diversity copy unit 808 is configured to perform time-frequency diversity copying according to the shift parameter, the interleave address of the interleaver, and the coding rate of the physical layer according to the number of times of copying.
  • time-frequency diversity copy system provided by the foregoing embodiment is only illustrated by the division of each of the foregoing program modules when performing information reminding. In actual applications, the foregoing processing may be allocated by different program modules according to requirements. Completed, dividing the internal structure of the device into Different program modules to perform all or part of the processing described above.
  • embodiment of the time-frequency diversity copying system and the time-frequency diversity copying method provided by the foregoing embodiments are in the same concept, and the specific implementation process is described in detail in the method embodiment, and details are not described herein again.
  • An embodiment of the present invention further provides a time-frequency diversity copy system, including: a processor and a memory for storing a computer program capable of running on the processor,
  • processor configured to execute when the computer program is executed:
  • the original data is subjected to time-frequency diversity copying based on the number of copies and the parameters of the time-frequency diversity copy.
  • FIG. 9 is a schematic diagram showing the hardware composition of a time-frequency diversity copy system according to another embodiment of the present invention.
  • the time-frequency diversity copy system 700 shown in FIG. 9 includes: at least one processor 701, a memory 702, at least one communication interface 704, and a user. Interface 703.
  • the various components in the time-frequency diversity copy system 700 are coupled together by a bus system 705. It will be appreciated that the bus system 705 is used to implement connection communication between these components.
  • the bus system 705 includes a power bus, a control bus, and a status signal bus in addition to the data bus. However, for clarity of description, various buses are labeled as bus system 705 in FIG.
  • memory 702 can be either volatile memory or non-volatile memory, and can include both volatile and nonvolatile memory.
  • the non-volatile memory may be a Read Only Memory (ROM), a Programmable Read-Only Memory (PROM), or an Erasable Programmable Read (EPROM). Only Memory), Electrically Erasable Programmable Read-Only Memory (EEPROM), Magnetic Random Access Memory (FRAM, ferromagnetic random access memory), flash memory (Flash Memory), magnetic surface memory, optical disk, or CD-ROM (Compact Disc Read-Only Memory); magnetic surface memory can be disk storage or tape Memory.
  • the volatile memory can be a random access memory (RAM) that acts as an external cache.
  • RAM Static Random Access Memory
  • SSRAM Synchronous Static Random Access Memory
  • SSRAM Dynamic Random Access
  • DRAM Dynamic Random Access Memory
  • SDRAM Synchronous Dynamic Random Access Memory
  • DDRSDRAM Double Data Rate Synchronous Dynamic Random Access Memory
  • ESDRAM enhancement Enhanced Synchronous Dynamic Random Access Memory
  • SLDRAM Synchronous Dynamic Random Access Memory
  • DRRAM Direct Memory Bus Random Access Memory
  • the memory 702 in the embodiment of the present invention is used to store various types of data to support the operation of the time-frequency diversity copy system 700.
  • Examples of such data include any computer program for operating on time-frequency diversity copy system 700, such as operating system 7021 and application 7022.
  • the operating system 7021 includes various system programs, such as a framework layer, a core library layer, a driver layer, and the like, for implementing various basic services and processing hardware-based tasks.
  • the application 7022 can include various applications for implementing various application services. A program implementing the method of the embodiment of the present invention may be included in the application 7022.
  • Processor 701 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the foregoing method may be completed by an integrated logic circuit of hardware in the processor 701 or an instruction in a form of software.
  • the processor 701 described above may be a general purpose processor, a digital signal processor (DSP), or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, or the like.
  • DSP digital signal processor
  • the processor 701 can implement or perform the various methods, steps, and logic blocks disclosed in the embodiments of the present invention.
  • a general purpose processor can be a microprocessor or any conventional processor or the like.
  • the steps of the method disclosed in the embodiment of the present invention may be directly implemented as a hardware decoding processor, or may be performed by a combination of hardware and software modules in the decoding processor.
  • the software module can reside in a storage medium located in memory 702, which reads the information in memory 702 and, in conjunction with its hardware, performs the steps of the foregoing method.
  • the time-frequency diversity copy system 700 may be implemented by one or more Application Specific Integrated Circuits (ASICs), DSPs, Programmable Logic Devices (PLDs), and Complex Programmable Logics.
  • ASICs Application Specific Integrated Circuits
  • DSPs Digital Signal processors
  • PLDs Programmable Logic Devices
  • Complex Programmable Logics Device
  • CPLD Complex Programmable Logic Device
  • FPGA Field-Programmable Gate Array
  • general-purpose processor controller
  • controller microcontroller (Micro Controller Unit) (MCU), microprocessor (Microprocessor), Or other electronic components are implemented to perform the aforementioned methods.
  • the time-frequency diversity copy system acquires the original data to be transmitted; determines the number of interleavers according to the number of times of copying in the obtained carrier mapping table index; and based on the carrier mapping table index and the determined interleaver And determining a parameter for performing time-frequency diversity copying on the original data; performing time-frequency diversity copying on the original data based on the copy number and the parameter of the time-frequency diversity copy.
  • time-frequency diversity copying can be performed for different data lengths, different modulation modes, and different copy times, thereby improving the diversity gain of the system.

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Abstract

一种时频分集拷贝方法、系统及存储介质，所述方法包括：获取待传输的原始数据；根据获取的载波映射表索引中的拷贝次数确定交织器个数；基于所述载波映射表索引和所述确定的交织器个数确定对所述原始数据进行时频分集拷贝的参数；基于所述拷贝次数和所述时频分集拷贝的参数对所述原始数据进行时频分集拷贝。

Description

一种时频分集拷贝方法、系统及存储介质
相关申请的交叉引用
本申请基于申请号为201611128641.0、申请日为2016年12月09日的中国专利申请提出，并要求该中国专利申请的优先权，该中国专利申请的全部内容在此引入本申请作为参考。
技术领域
本发明涉及电力线载波通信技术领域，并且更具体地，涉及一种时频分集拷贝方法、系统及存储介质。
背景技术
电力线载波通信是利用电力布线来传送和接收通信信号的有线通信技术。由于电力线网络分布广泛，因此使用电力线作为通信媒质无需在室内打孔布线重新构建通信网络，具有成本低廉，连接方便等优点，在智能电网和宽带接入方面受到越来越多的关注。
正交频分复用(Orthogonal Frequency Division Multiplexing，OFDM)是一种将可用传输信道带宽再分为多个彼此重叠和正交的离散信道或载波的扩展频谱技术。数据以具有特定持续时间和包括一定数量载频的码元的形式发送。利用二相移位键控(Binary Phase Shift Keying，BPSK)或四相移位键控(Quadrature Phase Shift Keying，QPSK)之类的惯用方案可以对这些OFDM载波发送的数据进行编码。
通信信道是通信的基础，与无线通信相同，电力线通信的性能主要受到电力线通信信道的制约。低压电力网不是为传输高速数据而设计的，其构成电力网的组件是按照输送电能的损失最小并保证可靠地传输低频电流 而设计的；因此，在低压线上进行信号传输时，可能在信道上产生差错突发的脉冲噪声和造成频率选择性衰落的延迟扩展，从而导致接收端无法正确地解调出发送信号，故采用分集技术十分必要。
发明内容
为了解决背景技术存在的上述问题，本发明提供一种时频分集拷贝方法、系统及存储介质。
本发明实施例提供一种时频分集拷贝方法，所述方法包括：
获取待传输的原始数据；
根据获取的载波映射表索引中的拷贝次数确定交织器个数；
基于所述载波映射表索引和所述确定的交织器个数确定对所述原始数据进行时频分集拷贝的参数；
基于所述拷贝次数和所述时频分集拷贝的参数对所述原始数据进行时频分集拷贝。
上述方案中，所述基于所述载波映射表索引和所述确定的交织器个数确定对所述原始数据进行时频分集拷贝的参数，包括：
根据所述载波映射表索引中的可使用的子载波个数与所确定的交织器个数的比值确定实际使用的子载波个数；
根据所述实际使用的子载波个数与所述拷贝次数的比值确定每部分待拷贝数据的载波个数；
根据所述载波映射表索引中的物理层编码速率与所述每部分待拷贝数据的载波个数之积确定每部分待拷贝数据的比特数目；
根据所述原始数据的长度与每部分待拷贝数据的比特数目的比值确定正交频分复用符号数目；
根据所述物理层编码速率与实际使用的子载波个数之积确定每个正交频分复用符号的比特数目；
根据所述实际使用的子载波个数与拷贝次数对应的交织器个数的比值确定每个交织器对应的子载波个数；
基于所述原始数据的长度、及每个正交频分复用符号的比特数目确定最后一个正交频分复用符号的比特数目；
根据所述原始数据的长度、所确定正交频分复用符号数目、及每部分待拷贝数据的比特数目确定最后一部分待拷贝数据的比特数目。
上述方案中，所述载波映射表索引包括：物理层的编码速率，拷贝次数，物理块大小，及可传输的原始数据的长度。
上述方案中，所述根据获取的载波映射表索引中的拷贝次数确定交织器个数包括：
当拷贝次数是2次时，确定交织器个数是8个，每次拷贝交织器个数是4个；
当拷贝次数是4次时，确定交织器个数是8个，每次拷贝交织器个数是2个；
当拷贝次数是5次时，确定交织器个数是10个，每次拷贝交织器个数是2个；
当拷贝次数是7次时，确定交织器个数是14个，每次拷贝交织器个数是2个；以及
当拷贝次数是11次时，确定交织器个数是11个，每次拷贝交织器个数是1个。
上述方案中，所述方法还包括：根据最后一个正交频分复用符号的比特数目、最后一部分待拷贝数据的比特数目、以及拷贝次数的关系，确定时频分集拷贝的移位参数；
当拷贝次数为1时，移位参数cyclicshift＝0；
当拷贝次数为2时，若最后一个OFDM符号的比特数目 BitsInLastOFDM不大于拷贝时每部分的比特数目BitsPerPart，移位参数cyclicshift＝[0,0]，否则移位参数cyclicshift＝[0,1]。
当拷贝次数为4时，BitsInLastOFDM≤BitsPerPart，移位参数cyclicshift＝[0,0,0,0]，BitsPerPart<BitsInLastOFDM≤2×BitsPerPart，移位参数，2×BitsPerPart<BitsInLastOFDM≤3×BitsPerPart，移位参数cyclicshift＝[0,0,0,0]，3×BitsPerPart<BitsInLastOFDM≤4×BitsPerPart，移位参数cyclicshift＝[0,1,2,3]，
当拷贝次数为5时，BitsInLastOFDM≤4×BitsPerPart，移位参数cyclicshift＝[0,0,0,0,0]，否则，移位参数cyclicshift＝[0,1,2,3,4]。
当拷贝次数为7时，BitsInLastOFDM≤6×BitsPerPart，移位参数cyclicshift＝[0,0,0,0,0,0,0]，否则，移位参数cyclicshift＝[0,1,2,3,4,5,6]。
当拷贝次数为11时，BitsInLastOFDM≤10×BitsPerPart，移位参数cyclicshift＝[0,0,0,0,0,0,0,0,0,0,0]，否则，移位参数cyclicshift＝[0,1,2,3,4,5,6,7,8,9,10]。
上述方案中，所述根据所述实际使用的子载波个数与拷贝次数对应的交织器个数的比值确定每个交织器对应的子载波个数，包括：
根据每个交织器对应的子载波个数和交织器个数计算交织偏移步长；
根据交织偏移步长确定每个交织器的交织步长；
基于根据交织步长计算每个交织器的交织地址；
基于所述拷贝次数、所述移位参数、所述交织器的交织地址、及所述载波映射表索引中物理层的编码速率，对所述原始数据进行时频分集拷贝。
上述方案中，所述根据所述实际使用的子载波个数与拷贝次数对应的 交织器个数的比值确定每个交织器对应的子载波个数，包括：
计算交织偏移步长InterStep：
Figure PCTCN2017109131-appb-000001
其中，InterStep表示交织偏移步长，CarriersPerInterleaver表示拷贝时每个交织器对应的子载波个数，InterNum表示拷贝次数对应的交织器个数，
Figure PCTCN2017109131-appb-000002
表示取下整；
根据交织偏移步长确定每个交织器的交织步长，其对应关系如下：
当InterStep＜1时，InterShiftStep等于0；
当1≤InterStep＜2时，InterShiftStep等于1；
当2≤InterStep＜4时，InterShiftStep等于2；
当4≤InterStep＜8时，InterShiftStep等于4；
当8≤InterStep＜16时，InterShiftStep等于8；
根据交织步长计算每个交织器的交织地址包括：
每个交织器在进行交织时，均采用行进列出的方式，首先将原始地址按照行进的方式存储在一个N行M列的矩阵中，再将矩阵中的元素按照列的顺序读取出来，读取之后，再将每个交织器进行循环移位，得到最终的交织结果，具体计算公式如下：
在第i个交织器进行交织时，其交织器的矩阵列数M(i)
M(i)＝i*InterShiftStep
其中，M(i)表示第i个交织器交织时的矩阵列数，InterShiftStep表示交织器的交织步长，
在第i个交织器进行循环移位时，其循环移位参数cyc(i)为：
cyc(i)＝2*(i-1)*InterShiftStep
其中，cyc(i)表示第i个交织器的循环移位参数，InterShiftStep表示交 织器的交织步长。
上述方案中，所述基于所述拷贝次数、所述移位参数、所述交织器的交织地址、及所述载波映射表索引中物理层的编码速率，对所述原始数据进行时频分集拷贝，包括：
在进行第N次拷贝时，先按照移位参数对拷贝的部分进行移位，其中N大于1；
将每部分数据分成与每次拷贝所需交织器个数数量相同的块；
在拷贝时，比特和子载波根据物理层的编码速率进行映射。
本发明实施例还提供一种时频分集拷贝系统，其特征在于，所述系统包括：
数据形成单元，配置为获取待传输的原始数据；
交织器确定单元，配置为根据获取的载波映射表索引中的拷贝次数确定交织器个数；
时频分集拷贝参数确定单元，配置为基于所述载波映射表索引和所述确定的交织器个数确定对所述原始数据进行时频分集拷贝的参数；
时频分集拷贝单元，配置为基于所述拷贝次数和所述时频分集拷贝的参数对所述原始数据进行时频分集拷贝。
本发明实施例还提供一种时频分集拷贝系统，包括：
存储器，配置为存储可执行程序；
处理器，配置为通过执行所述存储器中存储的可执行程序时，实现上述的时频分集拷贝方法。
本发明实施例还提供一种计算机存储介质，存储有可执行程序，所述可执行程序被处理器执行时，实现上述的时频分集拷贝方法。
本发明实施例提供的时频分集拷贝方法、系统及存储介质针对不同的数据长度、不同调制方式、不同的拷贝次数进行时频分集拷贝，提高了系 统的分集增益。
附图说明
通过参考下面的附图，可以更为完整地理解本发明的示例性实施方式：
图1是本发明具体实施方式时频分集拷贝方法的一个可选流程图；
图2是本发明一可选实施例中参数大小的示意图；
图3是本发明一可选实施例中交织器交织方式的示意图；
图4是本发明具体实施方式的时频分集拷贝实施例的示意图；
图5是本发明具体实施方式的进行时频分集拷贝时比特和载波的映射关系的局部示意图；
图6是本发明具体实施方式的基于正交频分复用的时频分集拷贝方法的仿真示意图；
图7是本发明具体实施方式的基于正交频分复用的时频分集拷贝方法的另一个仿真示意图；
图8A是本发明实施例时频分集拷贝系统的一个可选结构示意图；
图8B是本发明具体实施方式的基于正交频分复用的时频分集拷贝系统的结构图。
图9为本发明实施例时频分集拷贝系统的一个可选硬件组成结构示意图。
具体实施方式
现在参考附图介绍本发明的示例性实施方式，然而，本发明可以用许多不同的形式来实施，并且不局限于此处描述的实施例，提供这些实施例是为了详尽地且完全地公开本发明，并且向所属技术领域的技术人员充分传达本发明的范围。对于表示在附图中的示例性实施方式中的术语并不是对本发明的限定。在附图中，相同的单元/元件使用相同的附图标记。
除非另有说明，此处使用的术语(包括科技术语)对所属技术领域的技术人员具有通常的理解含义。另外，可以理解的是，以通常使用的词典限定的术语，应当被理解为与其相关领域的语境具有一致的含义，而不应该被理解为理想化的或过于正式的意义。
本发明实施例提供的时频分集拷贝方法，时频分集拷贝系统获取待传输的原始数据；根据获取的载波映射表索引中的拷贝次数确定交织器个数；基于所述载波映射表索引和所述确定的交织器个数确定对所述原始数据进行时频分集拷贝的参数；基于所述拷贝次数和所述时频分集拷贝的参数对所述原始数据进行时频分集拷贝。
图1是本发明具体实施方式时频分集拷贝方法的一个可选流程图。如图1所示，时频分集拷贝方法的实施基于正交频分复用。
在步骤S101，物理层接收介质访问控制层信息，并生成物理层需要传输的原始数据。物理层接收的介质访问控制层信息包含载波映射表索引，所述载波映射表索引包括：物理层的编码速率，拷贝次数，物理块大小，并能够根据物理块大小计算出物理层可传输的原始数据长度。
本实施例采用频段0，载波映射表索引为2，编码速率为2，采用QPSK，拷贝次数为5，可使用的子载波个数为411，物理块为136，物理层可传输的数据长度N_data为1088。
在步骤S102，根据拷贝次数确定交织器个数。根据拷贝次数确定交织器个数包括：当拷贝次数是2次时，交织器个数是8个，每次拷贝交织器个数是4个；当拷贝次数是4次时，交织器个数是8个，每次拷贝交织器个数是2个；当拷贝次数是5次时，交织器个数是10个，每次拷贝交织器个数是2个；当拷贝次数是7次时，交织器个数是14个，每次拷贝交织器个数是2个；以及当拷贝次数是11次时，交织器个数是11个，每次拷贝交织器个数是1个。在本实施例中，由于拷贝次数为5，故交织器个数应为 10，且每次拷贝交织器的个数是2个。
在步骤S103，根据所述介质访问控制层信息和确定的交织器个数计算时频分集拷贝的参数。
其中，所述参数包括：拷贝时实际使用的子载波个数、每部分数据的载波个数、每部分数据的比特数目、需要的正交频分复用符号数目、每个正交频分复用符号的比特数目、最后一个正交频分复用符号的比特数目、每个交织器对应的子载波个数和最后一部分数据的比特数目。每个参数的计算过程如下所示。
a)利用公式(1)计算拷贝时实际使用的子载波个数N_real_carrier：
Figure PCTCN2017109131-appb-000003
其中，N_real_carrier表示拷贝时实际使用的子载波个数，InterNum表示拷贝次数对应的交织器个数，N_carrier表示可使用的子载波个数，
Figure PCTCN2017109131-appb-000004
表示取下整，本发明实施例中，实际使用的子载波个数为
Figure PCTCN2017109131-appb-000005
b)利用公式(2)计算拷贝时每部分的载波个数CarriersPerPart：
Figure PCTCN2017109131-appb-000006
其中，CarriersPerPart表示拷贝时每部分的载波个数，N_real_carrier表示拷贝时实际使用的子载波个数，N_copies表示拷贝次数，
Figure PCTCN2017109131-appb-000007
表示取下整。
本发明实施例中，将原始数据分为5个部分，每个部分的载波个数为
Figure PCTCN2017109131-appb-000008
c)利用公式(3)计算拷贝时每部分的比特数目BitsPerPart：
BitsPerPart＝BPC*CarriersPerPart     (3)
其中，BitsPerPart表示拷贝时每部分的比特数目，BPC表示物理层编码 速率，CarriersPerPart表示拷贝时每部分的载波个数。
本发明实施例中，物理层编码速率为2，每部分的比特数目为2*82＝164。
d)利用公式(4)计算拷贝时需要的正交频分复用(正交频分复用符号)符号数目N_symbol；
Figure PCTCN2017109131-appb-000009
其中，N_symbol表示拷贝时需要的正交频分复用符号数目，N_data表示原始数据长度，BitsPerPart表示拷贝时每部分的比特数目，
Figure PCTCN2017109131-appb-000010
表示取上整。
本发明实施例中，原始数据长度为1088，每部分的比特数目为164，得到拷贝时需要的OFDM符号数目为7个。
e)利用公式(5)计算拷贝时每个正交频分复用符号的比特数目BitsPerSymbol：
BitsPerSymbol＝BPC*N_real_carrier     (5)
其中，BitsPerSymbol表示拷贝时每个正交频分复用符号的比特数目，BPC表示物理层编码速率，N_real_carrier表示拷贝时实际使用的子载波个数。
本发明实施例中，每个OFDM符号的比特数目为2*410＝820。
f)利用公式(6)计算最后一个正交频分复用符号的比特数目BitsInLastOFDM：
Figure PCTCN2017109131-appb-000011
其中，BitsInLastOFDM表示最后一个正交频分复用符号的比特数目，，N_data表示原始数据长度，BitsPerSymbol表示拷贝时每个正交频分复用符号的比特数目，
Figure PCTCN2017109131-appb-000012
表示取下整。
本发明实施例中，最后一个OFDM符号的比特数1088-820＝268。
g)利用公式(7)计算拷贝时每个交织器对应的子载波个数CarriersPerInterleaver：
Figure PCTCN2017109131-appb-000013
其中，CarriersPerInterleaver表示拷贝时每个交织器对应的子载波个数，N_real_carrier表示拷贝时实际使用的子载波个数，InterNum表示拷贝次数对应的交织器个数。
本发明实施例中，每个交织器对应的子载波个数为410÷10＝41。
h)利用公式(8)计算拷贝时数据最后一部分的比特数目BitsInLastPart：
BitsInLastPart＝N_data-(N_symbol-1)*BitsPerPart   (8)
其中，BitsInLastPart表示拷贝时数据最后一部分的比特数目，N_data表示原始数据长度，N_symbol表示拷贝时需要的正交频分复用符号数目，BitsPerPart表示拷贝时每部分的比特数目。
本发明实施例中，最后一部分的比特数目为1088-6*164＝104。
在步骤S104，判断最后一部分数据的比特数目是否大于0，若是，则执行步骤S105，否则，执行步骤S106。
在本实施例中，最后一部分数据的比特数目是104，故执行步骤S105。
在步骤S105，根据拷贝时每部分数据的比特数目和最后一部分数据的比特数目计算需要添加的数据长度，并获取新的数据序列。
在本实施例中，获取新的数据序列的过程如下所示：
步骤1、利用公式(9)计算需要添加的数据长度N_add：
N_add＝BitsPerPart-BitsInLastPart   (9)
其中，N_add表示需要添加的数据长度，BitsPerPart表示拷贝时每部分的比特数目，BitsInLastPart表示拷贝时数据最后一部分的比特数目。本实施例的，添加的数据长度为164-104＝60。
步骤2、每次拷贝添加N_add长度数据，添加策略为：第一次拷贝的N_add长度数据来自原始数据的1至N_add个比特，第二次拷贝的N_add长度数据来自原始数据的(N_add+1)至2N_add个比特，依次类推，直至第N次拷贝的N_add长度数据来自原始数据的[(N-1)*N_add+1]个至N*N_add个比特。
步骤3、利用公式(10)更新数据长度N_data_actual，计算公式如下：
N_data_actual＝N_data+N_add   (10)
其中，N_data_actual表示更新的数据长度，N_data表示原始数据长度，N_add表示需要添加的数据长度。在本实施例中，更新的数据长度为1088+60＝1148个。
图2是本发明一可选实施例中参数大小的示意图。如图2所示，通过步骤S103和步骤S105的计算，本发明具体实施方式中进行时频分集拷贝的参数的大小分别为：拷贝时实际使用的子载波个数是410个，每部分数据的载波个数是82个，每部分数据的比特数目是164个，需要的正交频分复用符号数目是7个，每个正交频分复用符号的比特数目是820个，最后一个正交频分复用符号的比特数目是268个，每个交织器对应的子载波个数是41个，最后一部分数据的比特数目104，新的数据长度是1148。
在步骤S106，根据拷贝次数和最后一个正交频分复用符号的比特数目计算时频分集拷贝的移位参数。
在一优选实施方式中，当拷贝次数为1时，移位参数cyclicshift＝0；
当拷贝次数为2时，若最后一个正交频分复用符号的比特数目BitsInLastOFDM不大于拷贝时每部分的比特数目BitsPerPart，移位参数cyclicshift＝[0,0]，否则移位参数cyclicshift＝[0,1]；
当拷贝次数为4时，BitsInLastOFDM≤BitsPerPart，移位参数 cyclicshift＝[0,0,0,0]，BitsPerPart<BitsInLastOFDM≤2×BitsPerPart，移位参数cyclicshift＝[0,0,1,1]，2×BitsPerPart<BitsInLastOFDM≤3×BitsPerPart，移位参数cyclicshift＝[0,0,0,0]，3×BitsPerPart<BitsInLastOFDM≤4×BitsPerPart，移位参数cyclicshift＝[0,1,2,3]；
当拷贝次数为5时，BitsInLastOFDM≤4×BitsPerPart，移位参数cyclicshift＝[0,0,0,0,0]，否则，移位参数cyclicshift＝[0,1,2,3,4]；
当拷贝次数为7时，BitsInLastOFDM≤6×BitsPerPart，移位参数cyclicshift＝[0,0,0,0,0,0,0]，否则，移位参数cyclicshift＝[0,1,2,3,4,5,6]；
当拷贝次数为11时，BitsInLastOFDM≤10×BitsPerPart，移位参数cyclicshift＝[0,0,0,0,0,0,0,0,0,0,0]，否则，移位参数cyclicshift＝[0,1,2,3,4,5,6,7,8,9,10]。
在本实施例中，拷贝次数是5次，BitsInLastOFDM是268，BitsPerPart是164，满足BitsInLastOFDM≤4×BitsPerPart，故移位参数为cyclicshift＝[0,0,0,0,0]
在步骤S107，根据拷贝时每个交织器对应的子载波个数和交织器个数计算交织偏移步长，并根据交织偏移步长确定每个交织器的交织步长，最后根据交织步长计算每个交织器的交织地址。具体计算方法如下所示。
步骤1、利用公式(11)计算交织偏移步长InterStep：
Figure PCTCN2017109131-appb-000014
其中，InterStep表示交织偏移步长，CarriersPerInterleaver表示拷贝时每个交织器对应的子载波个数，InterNum表示拷贝次数对应的交织器个数，
Figure PCTCN2017109131-appb-000015
表示取下整，在本实施例中，拷贝时每个交织器对应的子载波个数是41，拷贝次数对应的交织器个数是10，根据计算可知，交织偏移步长是2。
步骤2、根据交织偏移步长确定每个交织器的交织步长，其对应关系如 下：
当InterStep＜1时，InterShiftStep等于0；
当1≤InterStep＜2时，InterShiftStep等于1；
当2≤InterStep＜4时，InterShiftStep等于2；
当4≤InterStep＜8时，InterShiftStep等于4；
当8≤InterStep＜16时，InterShiftStep等于8；
在本实施例中，交织偏移步长是2，交织步长也是2。
步骤3、根据交织步长计算每个交织器的交织地址包括：
每个交织器在进行交织时，均采用行进列出的方式，首先将原始地址按照行进的方式存储在一个N行M列的矩阵中，再将矩阵中的元素按照列的顺序读取出来，读取之后，再将每个交织器进行循环移位，得到最终的交织结果，具体计算公式如下：
在第i个交织器进行交织时，交织器的矩阵列数M(i)如公式(12)所示：
M(i)＝i*InterShiftStep   (12)
其中，M(i)表示第i个交织器交织时的矩阵列数，InterShiftStep表示交织器的交织步长，
在第i个交织器进行循环移位时，循环移位参数cyc(i)如公式(12)所示：
cyc(i)＝2*(i-1)*InterShiftStep          (13)
其中，cyc(i)表示第i个交织器的循环移位参数，InterShiftStep表示交织器的交织步长。
在本实施例中，共有10个交织器，对于第一个交织器，其矩阵列数M为2，对第二个交织器，其矩阵列数为4，对第十个交织器，其矩阵列数为 20，通过10个交织器的交织，可以得到10个交织输出结果。图3是本发明具一可选实施例中交织器交织方式的示意图。如图3所示，对于第三个交织器，其交织时矩阵的列数M为6，矩阵的行数N为7，循环移位参数为8，图3中交织输出的结果为[1，7，13，19，25，31，37，……，17，23，29，35，41，6，12，18，24，30，36]，之后对交织结果进行循环移位，由于循环移位参数为8，故最终的交织器3的交织地址为[35，41，6，12，18，24，30，36，1，7，13，19，25，31，37，……，17，23，29]。
在步骤S108，按照拷贝次数，根据移位参数、交织器的交织地址，物理层的编码速率依次进行时频分集拷贝。
在一可选实施方式中，根据移位参数、交织器的交织地址，物理层的编码速率依次进行时频分集拷贝包括：
在进行第N次拷贝时，先按照移位参数对拷贝的部分进行移位，其中N大于1；
将每部分数据分成与每次拷贝所需交织器个数数量相同的块；
在拷贝时，比特和子载波根据物理层的编码速率进行映射。
图4是本发明具体实施方式的时频分集拷贝实施例的示意图。如图4所示，实施例中，拷贝5次，第一次拷贝时，每个部分均采用交织器1，2的交织地址，对于第一部分Part1，其拷贝结果为P1_1(I1)，P1_2(I2)，P1_1表示Part1的第一块比特，在实施例中，为82个比特，P1_2表示Part1的第二块比特，在实施例中，同样也为82个比特，I1表示交织器1的最终交织地址，I2表示交织器2的最终交织地址，对于第二部分，其拷贝结果为P2_1(I1)，P2_2(I2)，P2_1表示Part2的第一块比特，P2_2表示Part2的第二块比特，对于第一次拷贝的第i部分Part i，其拷贝结果为Pi_1(I1)，Pi_2(I2)，Pi_1表示Part i的第一块比特，Pi_2表示Part i的第二块比特；第二次拷贝时，先按照移位参数对需要拷贝的部分进行移位，再将每部分 采用交织器3，4的交织地址进行交织，实施例中移位参数的第二个元素为0，故不需要进行移位，每一部分进行交织时，同第一次拷贝情况类似，只是其交织地址采用交织器3，4的输出结果，如图5中所示对于第一部分Part1，其拷贝结果为P1_1(I3)，P1_2(I4)，对于第二部分，其拷贝结果为P2_1(I3)，P2_2(I4)，对于第二次拷贝的第i部分Part i，其拷贝结果为Pi_1(I3)，Pi_2(I4)；对于第j次拷贝，先按照移位参数中的第j个元素，对需要拷贝的7部分进行移位，再将每个部分按照交织器2j-1，2j的输出进行交织，直至拷贝结束。
图5是本发明具体实施方式的进行时频分集拷贝时比特和载波的映射关系的局部示意图。在拷贝时，比特和子载波根据BPC参数进行映射，若BPC为1，则每个子载波可映射1个比特，若BPC为2，则每个子载波可映射2个比特。在本实施例中，BPC为2，如图5所示，第一个OFDM符号第三部分的第一块比特P3_1中，比特和子载波的映射关系，在映射时，采用交织器1的交织器输出I(1)，图6中，P3_1对应的比特编号为329～410，对于第329、330个比特，其映射对应的子载波编号应为164+I(1，1)，其中，I(1，1)表示第一个交织器输出的第一个交织结果，对于第(328+2m-1)、(328+2m)个比特，其映射对应的子载波编号应为164+I(1，m)，其中，1≤m≤41，I(1，m)表示第一个交织器输出的第m个交织结果。其他部分的比特和子载波映射关系同图5类似，只是映射时对应的交织器不同。
在一可选实施方式中，分集拷贝在时域和频域同时进行，频域表现在将需传输的数据拷贝在不同子载波上，时域表现在将需传输的数据拷贝在不同的正交频分复用符号上。
为了验证本发明的效果，下面结合仿真实验进行进一步的描述。
图6是本发明具体实施方式的基于正交频分复用的时频分集拷贝方法的仿真示意图。图7是本发明具体实施方式的基于正交频分复用的时频分 集拷贝方法的另一个仿真示意图。图6的仿真条件为：带宽为1.953～11.96MHz，可用子载波个数为411，采用物理块为136，数据长度为1088，调制方式为QPSK，拷贝5次。图7的仿真条件为：带宽为2.441～5.615MHz，可用子载波个数为131，同样采用物理块为136，数据长度为1088，调制方式为QPSK，拷贝5次。仿真时采用的信道为电力线信道，信道模型为4径的衰落信道。图6和图7中的横轴表示信噪比，单位为dB，纵轴表示误码率。图6和图7中，以圆圈标示的曲线代表无分集拷贝的误码率曲线，以正方形标示的曲线代表本发明的误码率曲线。由图6和图7的仿真数据可见，本发明实施例利用时频分集拷贝数据和利用无分集拷贝数据相比，能够提供较高的分集增益，很好地对抗了信道的频率选择性，极大的提升了时频分集拷贝系统的可靠性。
本发明实施例还提供一种时频分集拷贝系统，所述系统的一个可选结构示意图，如图8A所示，包括：
数据形成单元801，配置为获取待传输的原始数据；
交织器确定单元802，配置为根据获取的载波映射表索引中的拷贝次数确定交织器个数；
时频分集拷贝参数确定单元803，配置为基于所述载波映射表索引和所述确定的交织器个数确定对所述原始数据进行时频分集拷贝的参数；
时频分集拷贝单元808，配置为基于所述拷贝次数和所述时频分集拷贝的参数对所述原始数据进行时频分集拷贝。
图8B是本发明具体实施方式的基于正交频分复用的时频分集拷贝系统的结构图。如图8B所示，基于正交频分复用的时频分集拷贝系统包括数据形成单元801、交织器确定单元802、时频分集拷贝参数确定单元803、数据长度判断单元804、新数据序列确定单元805、时频分集拷贝移位参数计算单元806、交织器交织地址计算单元807和时频分集拷贝单元808。
数据形成单元801，其配置为通过物理层接收介质访问控制层信息，并生成物理层需要传输的原始数据；
交织器确定单元802，其配置为根据拷贝次数确定交织器个数；
时频分集拷贝参数确定单元803，其配置为根据所述介质访问控制层信息和确定的交织器个数计算时频分集拷贝的参数，所述参数包括拷贝时实际使用的子载波个数、每部分数据的载波个数、每部分数据的比特数目、需要的正交频分复用符号数目、每个正交频分复用符号的比特数目、最后一个正交频分复用符号的比特数目、每个交织器对应的子载波个数和最后一部分数据的比特数目；
数据长度判断单元804，其配置为判断传输的数据的最后一部分的比特数目是否大于0；
新数据序列确定单元805，其配置为根据拷贝时每部分数据的比特数目和最后一部分数据的比特数目计算需要添加的数据长度，并获取新的数据序列；
时频分集拷贝移位参数计算单元806，其配置为根据拷贝次数和最后一个正交频分复用符号的比特数目计算时频分集拷贝的移位参数；
交织器交织地址计算单元807，其配置为根据拷贝时每个交织器对应的子载波个数和交织器个数计算交织偏移步长，并根据交织偏移步长确定每个交织器的交织步长，最后根据交织步长计算每个交织器的交织地址；以及
时频分集拷贝单元808，其配置为按照拷贝次数，根据移位参数、交织器的交织地址，物理层的编码速率依次进行时频分集拷贝。
需要说明的是：上述实施例提供的时频分集拷贝系统在进行信息提醒时，仅以上述各程序模块的划分进行举例说明，实际应用中，可以根据需要而将上述处理分配由不同的程序模块完成，即将装置的内部结构划分成 不同的程序模块，以完成以上描述的全部或者部分处理。另外，上述实施例提供的时频分集拷贝系统与时频分集拷贝方法实施例属于同一构思，其具体实现过程详见方法实施例，这里不再赘述。
本发明实施例还提供一种时频分集拷贝系统，包括：处理器和用于存储能够在处理器上运行的计算机程序的存储器，
其中，所述处理器用于运行所述计算机程序时，执行：
获取待传输的原始数据；
根据获取的载波映射表索引中的拷贝次数确定交织器个数；
基于所述载波映射表索引和所述确定的交织器个数确定对所述原始数据进行时频分集拷贝的参数；
基于所述拷贝次数和所述时频分集拷贝的参数对所述原始数据进行时频分集拷贝。
图9是本发明另一实施例的时频分集拷贝系统的硬件组成结构示意图，图9所示的时频分集拷贝系统700包括：至少一个处理器701、存储器702、至少一个通信接口704和用户接口703。时频分集拷贝系统700中的各个组件通过总线系统705耦合在一起。可理解，总线系统705用于实现这些组件之间的连接通信。总线系统705除包括数据总线之外，还包括电源总线、控制总线和状态信号总线。但是为了清楚说明起见，在图9中将各种总线都标为总线系统705。
可以理解，存储器702可以是易失性存储器或非易失性存储器，也可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(ROM，Read Only Memory)、可编程只读存储器(PROM，Programmable Read-Only Memory)、可擦除可编程只读存储器(EPROM，Erasable Programmable Read-Only Memory)、电可擦除可编程只读存储器(EEPROM，Electrically Erasable Programmable Read-Only Memory)、磁性随机存取存储 器(FRAM，ferromagnetic random access memory)、快闪存储器(Flash Memory)、磁表面存储器、光盘、或只读光盘(CD-ROM，Compact Disc Read-Only Memory)；磁表面存储器可以是磁盘存储器或磁带存储器。易失性存储器可以是随机存取存储器(RAM，Random Access Memory)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的RAM可用，例如静态随机存取存储器(SRAM，Static Random Access Memory)、同步静态随机存取存储器(SSRAM，Synchronous Static Random Access Memory)、动态随机存取存储器(DRAM，Dynamic Random Access Memory)、同步动态随机存取存储器(SDRAM，Synchronous Dynamic Random Access Memory)、双倍数据速率同步动态随机存取存储器(DDRSDRAM，Double Data Rate Synchronous Dynamic Random Access Memory)、增强型同步动态随机存取存储器(ESDRAM，Enhanced Synchronous Dynamic Random Access Memory)、同步连接动态随机存取存储器(SLDRAM，SyncLink Dynamic Random Access Memory)、直接内存总线随机存取存储器(DRRAM，Direct Rambus Random Access Memory)。本发明实施例描述的存储器702旨在包括但不限于这些和任意其它适合类型的存储器。
本发明实施例中的存储器702用于存储各种类型的数据以支持时频分集拷贝系统700的操作。这些数据的示例包括：用于在时频分集拷贝系统700上操作的任何计算机程序，如操作系统7021和应用程序7022。其中，操作系统7021包含各种系统程序，例如框架层、核心库层、驱动层等，用于实现各种基础业务以及处理基于硬件的任务。应用程序7022可以包含各种应用程序，用于实现各种应用业务。实现本发明实施例方法的程序可以包含在应用程序7022中。
上述本发明实施例揭示的方法可以应用于处理器701中，或者由处理器701实现。处理器701可能是一种集成电路芯片，具有信号的处理能力。 在实现过程中，上述方法的各步骤可以通过处理器701中的硬件的集成逻辑电路或者软件形式的指令完成。上述的处理器701可以是通用处理器、数字信号处理器(DSP，Digital Signal Processor)，或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。处理器701可以实现或者执行本发明实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者任何常规的处理器等。结合本发明实施例所公开的方法的步骤，可以直接体现为硬件译码处理器执行完成，或者用译码处理器中的硬件及软件模块组合执行完成。软件模块可以位于存储介质中，该存储介质位于存储器702，处理器701读取存储器702中的信息，结合其硬件完成前述方法的步骤。
在示例性实施例中，时频分集拷贝系统700可以被一个或多个应用专用集成电路(ASIC，Application Specific Integrated Circuit)、DSP、可编程逻辑器件(PLD，Programmable Logic Device)、复杂可编程逻辑器件(CPLD，Complex Programmable Logic Device)、现场可编程门阵列(FPGA，Field-Programmable Gate Array)、通用处理器、控制器、微控制器(MCU，Micro Controller Unit)、微处理器(Microprocessor)、或其他电子元件实现，用于执行前述方法。
已经通过上述实施方式描述了本发明。然而，本领域技术人员所公知的，正如附带的专利权利要求所限定的，除了本发明以上公开的其他的实施例等同地落在本发明的范围内。
通常地，在权利要求中使用的所有术语都根据他们在技术领域的通常含义被解释，除非在其中被另外明确地定义。所有的参考“一个/所述/该【装置、组件等】”都被开放地解释为所述装置、组件等中的至少一个实例，除非另外明确地说明。这里公开的任何方法的步骤都没必要以公开的准确的顺序运行，除非明确地说明。
工业实用性
本发明实施例中，时频分集拷贝系统获取待传输的原始数据；根据获取的载波映射表索引中的拷贝次数确定交织器个数；基于所述载波映射表索引和所述确定的交织器个数确定对所述原始数据进行时频分集拷贝的参数；基于所述拷贝次数和所述时频分集拷贝的参数对所述原始数据进行时频分集拷贝。如此，能够针对不同的数据长度、不同调制方式、不同的拷贝次数进行时频分集拷贝，提高了系统的分集增益。

Claims (13)

  1. 一种时频分集拷贝方法，所述方法包括：
    获取待传输的原始数据；
    根据获取的载波映射表索引中的拷贝次数确定交织器个数；
    基于所述载波映射表索引和所述确定的交织器个数确定对所述原始数据进行时频分集拷贝的参数；
    基于所述拷贝次数和所述时频分集拷贝的参数对所述原始数据进行时频分集拷贝。
  2. 根据权利要求1所述的方法，其中，所述基于所述载波映射表索引和所述确定的交织器个数确定对所述原始数据进行时频分集拷贝的参数，包括：
    根据所述载波映射表索引中的可使用的子载波个数与所确定的交织器个数的比值确定实际使用的子载波个数；
    根据所述实际使用的子载波个数与所述拷贝次数的比值确定每部分待拷贝数据的载波个数；
    根据所述载波映射表索引中的物理层编码速率与所述每部分待拷贝数据的载波个数之积确定每部分待拷贝数据的比特数目；
    根据所述原始数据的长度与每部分待拷贝数据的比特数目的比值确定正交频分复用符号数目；
    根据所述物理层编码速率与实际使用的子载波个数之积确定每个正交频分复用符号的比特数目；
    根据所述实际使用的子载波个数与拷贝次数对应的交织器个数的比值确定每个交织器对应的子载波个数；
    基于所述原始数据的长度、及每个正交频分复用符号的比特数目确定最后一个正交频分复用符号的比特数目；
    根据所述原始数据的长度、所确定正交频分复用符号数目、及每部分待拷贝数据的比特数目确定最后一部分待拷贝数据的比特数目。
  3. 根据权利要求1所述的方法，其中，所述载波映射表索引包括：物理层的编码速率，拷贝次数，物理块大小及可传输的原始数据的长度。
  4. 根据权利要求1所述的方法，其中，所述根据获取的载波映射表索引中的拷贝次数确定交织器个数包括：
    当拷贝次数是2次时，确定交织器个数是8个，每次拷贝交织器个数是4个；
    当拷贝次数是4次时，确定交织器个数是8个，每次拷贝交织器个数是2个；
    当拷贝次数是5次时，确定交织器个数是10个，每次拷贝交织器个数是2个；
    当拷贝次数是7次时，确定交织器个数是14个，每次拷贝交织器个数是2个；以及
    当拷贝次数是11次时，确定交织器个数是11个，每次拷贝交织器个数是1个。
  5. 根据权利要求1所述的方法，其中，所述根据所述原始数据的长度、所确定正交频分复用符号数目、及每部分待拷贝数据的比特数目，确定最后一部分待拷贝数据的比特数目，包括：
    当最后一部分待拷贝数据的比特数目大于0时，根据每部分待拷贝数据的比特数目和最后一部分待拷贝数据的比特数目，确定需要添加的数据长度；
    当最后一部分待拷贝数据的比特数目为0时，原始数据无需添加数据；
    基于所述需要添加的数据长度及所述原始数据，取新的数据序列。
  6. 根据权利要求5所述的方法，其中，所述基于所述需要添加的数据长度及所述原始数据，取新的数据序列，包括：
    计算需要添加的数据长度N_add＝BitsPerPart-BitsInLastPart；
    其中，N_add表示需要添加的数据长度，BitsPerPart表示拷贝时每部分的比特数目，BitsInLastPart表示拷贝时数据最后一部分的比特数目；
    每次拷贝添加N_add长度数据；添加策略为：第一次拷贝的N_add长度数据来自原始数据的1～N_add个比特，第二次拷贝的N_add长度数据来自原始数据的(N_add+1)～2N_add，依次类推，直至第N次拷贝；以及
    更新数据长度N_data_actual＝N_data+N_add；其中，N_data_actual表示更新的数据长度，N_data表示原始数据长度，N_add表示需要添加的数据长度。
  7. 根据权利要求2所述的方法，其中，还包括：根据最后一个正交频分复用符号的比特数目、最后一部分待拷贝数据的比特数目、以及拷贝次数的关系，确定时频分集拷贝的移位参数；
    当拷贝次数为1时，移位参数cyclicshift＝0；
    当拷贝次数为2时，若最后一个OFDM符号的比特数目BitsInLastOFDM不大于拷贝时每部分的比特数目BitsPerPart，移位参数cyclicshift＝[0,0]，否则移位参数cyclicshift＝[0,1]；
    当拷贝次数为4时，BitsInLastOFDM≤BitsPerPart，移位参数cyclicshift＝[0,0,0,0]，BitsPerPart＜BitsInLastOFDM≤2×BitsPerPart，移位参数，2×BitsPerPart＜BitsInLastOFDM≤3×BitsPerPart，移位参数cyclicshift＝[0,0,0,0]，3×BitsPerPart＜BitsInLastOFDM≤4×BitsPerPart，移位参数cyclicshift＝[0,1,2,3]；
    当拷贝次数为5时，BitsInLastOFDM≤4×BitsPerPart，移位参数 cyclicshift＝[0,0,0,0,0]，否则，移位参数cyclicshift＝[0,1,2,3,4]；
    当拷贝次数为7时，BitsInLastOFDM≤6×BitsPerPart，移位参数cyclicshift＝[0,0,0,0,0,0,0]，否则，移位参数cyclicshift＝[0,1,2,3,4,5,6]；
    当拷贝次数为11时，BitsInLastOFDM≤10×BitsPerPart，移位参数cyclicshift＝[0,0,0,0,0,0,0,0,0,0,0]，否则，移位参数cyclicshift＝[0,1,2,3,4,5,6,7,8,9,10]。
  8. 根据权利要求1所述方法，其中，所述根据所述实际使用的子载波个数与拷贝次数对应的交织器个数的比值确定每个交织器对应的子载波个数，包括：
    根据每个交织器对应的子载波个数和交织器个数计算交织偏移步长；
    根据交织偏移步长确定每个交织器的交织步长；
    基于根据交织步长计算每个交织器的交织地址；
    基于所述拷贝次数、所述移位参数、所述交织器的交织地址、及所述载波映射表索引中物理层的编码速率，对所述原始数据进行时频分集拷贝。
  9. 根据权利要求8所述的方法，其中，所述根据所述实际使用的子载波个数与拷贝次数对应的交织器个数的比值确定每个交织器对应的子载波个数，包括：
    计算交织偏移步长InterStep：
    Figure PCTCN2017109131-appb-100001
    其中，InterStep表示交织偏移步长，CarriersPerInterleaver表示拷贝时每个交织器对应的子载波个数，InterNum表示拷贝次数对应的交织器个数，
    Figure PCTCN2017109131-appb-100002
    表示取下整；
    根据交织偏移步长确定每个交织器的交织步长，其对应关系如下：
    当InterStep＜1时，InterShiftStep等于0；
    当1≤InterStep＜2时，InterShiftStep等于1；
    当2≤InterStep＜4时，InterShiftStep等于2；
    当4≤InterStep＜8时，InterShiftStep等于4；
    当8≤InterStep＜16时，InterShiftStep等于8；
    根据交织步长计算每个交织器的交织地址包括：
    每个交织器在进行交织时，均采用行进列出的方式，首先将原始地址按照行进的方式存储在一个N行M列的矩阵中，再将矩阵中的元素按照列的顺序读取出来，读取之后，再将每个交织器进行循环移位，得到最终的交织结果，具体计算公式如下：
    在第i个交织器进行交织时，其交织器的矩阵列数M(i)
    M(i)＝i*InterShiftStep
    其中，M(i)表示第i个交织器交织时的矩阵列数，InterShiftStep表示交织器的交织步长，
    在第i个交织器进行循环移位时，其循环移位参数cyc(i)为：
    cyc(i)＝2*(i-1)*InterShiftStep
    其中，cyc(i)表示第i个交织器的循环移位参数，InterShiftStep表示交织器的交织步长。
  10. 根据权利要求8所述的方法，其中，所述基于所述拷贝次数、所述移位参数、所述交织器的交织地址、及所述载波映射表索引中物理层的编码速率，对所述原始数据进行时频分集拷贝，包括：
    在进行第N次拷贝时，先按照移位参数对拷贝的部分进行移位，其中N大于1；
    将每部分数据分成与每次拷贝所需交织器个数数量相同的块；
    在拷贝时，比特和子载波根据物理层的编码速率进行映射。
  11. 一种时频分集拷贝系统，所述系统包括：
    数据形成单元，配置为获取待传输的原始数据；
    交织器确定单元，配置为根据获取的载波映射表索引中的拷贝次数确定交织器个数；
    时频分集拷贝参数确定单元，配置为基于所述载波映射表索引和所述确定的交织器个数确定对所述原始数据进行时频分集拷贝的参数；
    时频分集拷贝单元，配置为基于所述拷贝次数和所述时频分集拷贝的参数对所述原始数据进行时频分集拷贝。
  12. 一种时频分集拷贝系统，包括：
    存储器，配置为存储可执行程序；
    处理器，配置为通过执行所述存储器中存储的可执行程序时，实现权利要求1至10任一项所述的时频分集拷贝方法。
  13. 一种计算机存储介质，存储有可执行程序，所述可执行程序被处理器执行时，实现权利要求1至10任一项所述的时频分集拷贝方法。
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