WO2018103471A1 - 一种信号处理方法、装置及存储介质 - Google Patents
一种信号处理方法、装置及存储介质 Download PDFInfo
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- 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
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- 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
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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
- H04L1/0041—Arrangements at the transmitter end
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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
- H04L1/0064—Concatenated codes
- H04L1/0066—Parallel concatenated codes
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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
- H04L1/04—Arrangements for detecting or preventing errors in the information received by diversity reception using frequency diversity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03828—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties
- H04L25/03834—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties using pulse shaping
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
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- 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
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- 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
- H04L27/261—Details of reference signals
- H04L27/2613—Structure of the reference signals
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- 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
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- 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
- H04L27/2628—Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators
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- 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
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- 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
- H04L27/264—Pulse-shaped multi-carrier, i.e. not using rectangular window
- H04L27/26412—Filtering over the entire frequency band, e.g. filtered orthogonal frequency-division multiplexing [OFDM]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2203/00—Indexing scheme relating to line transmission systems
- H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
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- 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
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2662—Symbol synchronisation
- H04L27/2663—Coarse synchronisation, e.g. by correlation
Definitions
- the present invention relates to the field of power line carrier communication technology, and more particularly to a power line carrier communication system and an OFDM (Orthogonal Frequency Division Multiplexing)-based PLC (Power Line Communication).
- OFDM Orthogonal Frequency Division Multiplexing
- PLC Power Line Communication
- 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 and the power line is used as the communication medium, there is no need to reconstruct the communication network through the indoor puncturing wiring, which has the advantages of low cost, convenient connection, and the like, and therefore, the application of the power line in the smart grid and broadband access is affected. More and more attention.
- the performance of power line communication is mainly restricted by the power line communication channel. Since the high-voltage power line channel environment above 10kV is better, the power line carrier phone with medium-high voltage power line as the signal transmission channel has been widely used.
- the low voltage power grid is not designed to transmit high speed data.
- the components in the low voltage power grid are designed based on a strategy that minimizes the loss of delivered electrical energy and reliably transmits low frequency current. Therefore, when transmitting signals on a low-voltage power line, there are many problems, such as complicated interference noise, small line impedance, and strong signal attenuation.
- Embodiments of the present invention provide a signal processing method, apparatus, and storage medium, which can have a high frequency band utilization rate and a high transmission rate when a signal is transmitted on a power line, and have strong anti-code interference capability and strong anti-channel. Fading ability.
- the embodiment of the invention provides a signal processing method, including:
- the channel coding performed on the frame control data and the payload data includes:
- the frame control data and the payload data that are interleaved by the channel are separately subjected to diversity copy.
- the method before performing Turbo coding on the payload data, the method further includes: scrambling the payload data.
- performing turbo coding on the frame control data includes:
- the frame control data is encoded using a first component encoder and a second component encoder, respectively, wherein the input signal of the second component encoder is first subjected to Turbo interleaving.
- the Turbo interlace is interleaved in units of two bits, and the interleave length is equal to the number of double bits of the original data block length.
- the input bit data is copied to the frequency domain subcarrier, and the number of times of copying is determined according to requirements, thereby setting the offset difference between the I channel and the Q channel.
- the register state in the Turbo coded component encoder is related to the tail bit matrix, and the tail bit matrix is determined by the physical block size and the generator polynomial of the component encoder.
- the data of the link layer includes a carrier mapping table, where the code mapping rate, the modulation mode, the copy mode, and the adopted physical block type information of the physical layer are specified in the carrier mapping table;
- the mode specified by the carrier mapping table index is encoded.
- the number of diversity is 2, the number of interleavers is 8, and the number of interleavers per part is 4;
- the number of diversity is 4, the number of interleavers is 8, and the number of interleavers per part is 2;
- the number of diversity is 7
- the number of interleavers is 14, and the number of interleavers per part is 2.
- the number of diversity is 11, the number of interleavers is 11, and the number of interleavers per part is 1.
- the payload data is separately divided into a plurality of parts, and each part has one or more interleavers, and the result of the interleaver output is used as a mapping address of the subcarriers when each part is copied, and each copy is performed. Choose a different interleaver.
- the channel-encoded frame control data and payload data are modulated to the sub-carrier
- the wave includes:
- the mapped frame control data and payload data are scrambled and modulated onto corresponding subcarriers.
- the real control of the frame control data and the payload data after the inverse Fourier transform is respectively performed.
- phase rotation factor is added to the frame control data and the payload data mapped through the constellation, and the phase rotation reference value is generated by pseudo-random, and the real phase is the reference phase multiplied by ⁇ /4, wherein the scrambling mode is:
- a constellation point indicating the scrambled payload data k represents a carrier number
- X(k) represents a constellation point of the payload data before scrambling
- the reference phase includes a carrier number 1 to a carrier number 511.
- the frequency range is 1.953 ⁇ 11.96MHz, the starting number of the carrier is 80, the cutoff number is 490; if the frequency band 1 is used, the frequency range is 2.441 ⁇ 5.615MHz, carrier The starting number is 100 and the cutoff number is 230.
- a cyclic prefix is added to the frame control data and the payload data to generate an OFDM symbol, wherein the OFDM symbol time domain point of the frame control data and the payload data is 1024, the time is 40.96 ⁇ s; the roll-off interval is 124 points, and the time is 4.96. Ss; the guard interval of the frame control data is 458 points, the time is 18.32 ⁇ s; the guard interval of the first symbol and the second symbol of the payload data is 458 points, the time is 18.32 ⁇ s; the guard interval after the third symbol of the payload data It is 264 points and the time is 10.8 ⁇ s.
- the time domain preamble symbol is generated by the following method:
- the preamble sequence is generated according to the preamble phase table in the frequency domain, and the generating method is:
- X(k) represents a preamble sequence generated in the frequency domain
- k is a subcarrier symbol
- the data format of the preamble is 10.5 A and 2.5 -A, wherein the first 0.5 A is the second half of A, and the last 0.5 -A is the first half of -A.
- the preamble has a time domain point of 1024 and a time of 40.96 ⁇ s.
- the number of frame control signals is related to the frequency band used, wherein if the frequency band 0 is used, the number of frame control signals is four; if the frequency band 1 is used, the number of frame control signals is twelve. .
- the invention also discloses a signal processing method, comprising:
- the Fourier transformed data is demodulated to generate a frame control output and a load output.
- the demodulating the Fourier transformed data includes:
- the frame control data and the payload data after Turbo decoding are respectively output.
- the method further includes: descrambling the payload data after the Turbo decoding.
- the embodiment of the invention further provides a signal processing device, comprising:
- a first memory configured to store an executable program
- a first processor configured to: when executing the executable program stored in the first memory, implement:
- the embodiment of the invention further provides a signal processing device, comprising:
- a second memory configured to store an executable program
- a second processor configured to: when executing the executable program stored in the second memory, implement:
- the Fourier transformed data is demodulated to generate a frame control output and a load output.
- the embodiment of the invention further provides a storage medium storing an executable program, when the executable program is executed by the processor, executing:
- the embodiment of the invention further provides a storage medium storing an executable program, when the executable program is executed by the processor, executing:
- the Fourier transformed data is demodulated to generate a frame control output and a load output.
- the signal processing method of the invention has high frequency band utilization, high transmission rate, strong anti-code interference capability and strong anti-channel fading capability.
- the invention adopts Turbo coding, channel interleaving and the like, has strong error correction capability and strong anti-channel fading capability, and the diversity copy improves the diversity gain of the system by transmitting different backups of the same data, thereby improving the system Lu Great.
- the pseudo-random phase rotation factor is added to the constellation map to randomize the phase of the OFDM symbol, thus reducing the peak-to-average ratio of the OFDM symbol and improving the power amplifier efficiency of the system.
- FIG. 1 is a block diagram showing a flow generation process of a physical layer of the present invention
- FIG. 2 is an exemplary embodiment of a receive demodulation corresponding to a frame signal of the present invention
- Figure 4 is a structural diagram of frame data in the present invention.
- FIG. 5 is a flow chart of a frame control data forward error correction code in the present invention.
- FIG. 6 is a flow chart of a load data forward error correction code in the present invention.
- FIG. 7 is a structural diagram of a turbo encoder in the present invention.
- Figure 8 is a structural diagram of a Turbo component encoder in the present invention.
- Figure 9 is a flow chart of scrambling in the present invention.
- Figure 10 is a schematic diagram showing the format of preamble data in the present invention.
- Figure 11 is a time domain diagram of a preamble sequence generated using a preamble phase table in the present invention.
- FIG. 13 is a time domain diagram of a frame control sequence generated by a frame control and a load phase table in the present invention
- Figure 15 is a diagram showing a parameter definition pattern in the case of diversity copying in the present invention.
- Figure 16 is an embodiment of the present invention in the case of diversity copying
- Figure 17 is a timing chart of an OFDM symbol in the present invention.
- OFDM converts a set of high-speed serial data streams into low-speed parallel data streams, and then modulates the parallel data on mutually orthogonal subcarriers to achieve parallel data transmission.
- OFDM technology has strong anti-code interference capability, strong anti-fading capability, strong anti-burst noise capability, and high spectrum utilization.
- OFDM technology can be used in power line communication to combat the attenuation of power line channels and various noises and interferences introduced to meet the requirements of reliability, security and timeliness of smart grids.
- the present invention mainly provides a physical layer transmission signal generating method for OFDM-based broadband power line carrier communication.
- the communication frequency band used in the present invention is as shown in Table 1:
- frequency band 0 and frequency band 1 are currently used frequency bands, and frequency bands 2 to 4 are reserved frequency bands.
- the OFDM symbol used in the present invention is based on a 25 MHz clock sampling in the time domain, and the time domain points are as shown in Table 2.
- the transmission signal structure of the physical layer of the present invention is composed of a preamble, a frame control and a load, wherein The derivative consists of 13 OFDM symbols.
- the data format of the preamble is as shown in Fig. 10. It consists of 10.5 A and 2.5 -A. The first 0.5 A is the second half of A, and the last 0.5 A is -A. In the first half, A denotes an OFDM symbol.
- the number of symbols used for the frame control signal is as shown in Table 3. Four frame control symbols are used in band 0 and 12 frame control symbols are used in band 1.
- the specific implementation steps of the OFDM-based broadband power line carrier communication physical layer signal processing method of the present invention are as follows:
- Step 1 The physical layer receives input from the data link layer, specifically from the Media Access Control (MAC) sublayer.
- MAC Media Access Control
- Step 2 The physical layer divides the data from the MAC layer into frame control data and payload data, and separately processes the encoding of the frame control and the payload data.
- Step 3 Encode the frame control data.
- FIG. 5 is a flowchart showing a frame control forward error correction code.
- the encoding process of the frame control is: first performing Turbo coding, then performing channel interleaving, and finally performing diversity copying. Specifically include:
- the frame-controlled Turbo coding block has a length of PB16 and a code rate of 1/2, and the final Turbo output is 256 bits, wherein the first 128 bits are information codes and the last 128 bits are check codes.
- Figure 7 is a block diagram of a Turbo encoder consisting of a Turbo interleaver and two identical component encoders. The workflow of the Turbo encoder is: for each pair of information bits [u0, u1], the output system outputs the pair of information bits, and the first component encoder is based on the input bit pair [u0, u1] A parity bit p0 is output; the input two information bits [u0, u1] pass through the Turbo interleaver, input to the component encoder 2, and output a parity bit q0.
- the [u0, u1] input after Turbo coding is encoded as [u0, u1, p0, q0].
- the Turbo interleaver is used to interleave the original data as an input to the second component encoder.
- the Turbo interlace is interleaved in units of two bits, and the interleave length is equal to the number of double bits of the original data block length.
- the double bit refers to two bits, and when interleaving, two bits are interleaved as one unit. Since the interleaving is in units of two bits, the interleave length is equal to the sequence of two bits, for example, the number of data bits is 128, and the interleave length is 64 in units of 2 bits.
- FIG. 8 is an exemplary embodiment of a component encoder.
- binary encoding is used.
- Step 3b performing channel interleaving on the turbo encoded frame control data.
- the data information bits generated by Turbo coding are the same as the check bits and the pre-encoding sequence, and the information bits are first and the check bits are after. If K represents the number of information bits, NK represents the number of check bits, K information bits. It is divided into 4 sub-blocks, each of which has a size of K/4 bits, and NK check bits are divided into 4 sub-blocks, each of which has a size of (NK) / 4 bits.
- the information code outputted by the Turbo code is written into the matrix storage space, and the encoder sequentially outputs the first block (K/4 bit) of the information bit to the block 1, and the second block (K/4) Bit) to block 2, the third block (K/4 bits) into block 3, the fourth block (K/4 bits) into block 4, equivalent to storing the information bits in a K/4
- the four bits of each line are simultaneously read when interleaving.
- StepSize When reading data from the matrix, first start from the 0th line, then add an interleaving step StepSize every time the first row address is read, so that the first round of row address reading order is (0, StepSize, 2*StepSize,%) After reading the [K/4]/StepSize line, it reads the end of the matrix, then adds the first address of the next read row to 1, and then interleaves each time the row address is read.
- the step size StepSize after reading the [K/4]/StepSize line, it reaches the tail again.
- the second round reads the line address order (1,1+StepSize, 1+2*StepSize,...), then the third round address Add 1 to 2, and so on. After the StepSize round, all the lines are read.
- the check code When the check code is interleaved, the check code is stored in the matrix storage space in the same way as the information code. At the 1/2 code rate, the reading of the check bit is similar to the reading of the information bits. The difference lies in the check.
- the first read of the bit starts from the line defined by the interleave offset value offset, and the interleave step size is StepSize.
- Read T line data For the 16/18 code rate, the row pointer is not initialized after each round of reading, but is continuously read from the beginning (offset, (offset+StepSize) mod T, (offset+2*StepSize)mod T, etc, until T The line is read.
- the interleaving is continued between the information bits and the check bits, and different interleaving methods are set according to different code rates. For example, when the code rate is 1/2, the first 4 bits of the output are information codes. Then 4 bits are the check code, and so on. After the interleaving, the displacement is performed in units of 4 bits, and the order is adjusted every two 4 bits.
- step 3c the frame control data subjected to channel interleaving is subjected to diversity copy.
- the diversity copy is to copy the input original bit data to different frequency domain subcarriers, which facilitates the next constellation point mapping. For example, if the number of bits of the frame control input is 256, the offset difference between the I channel and the Q channel address at the time of copying is set to 128. If four frames are used to control the OFDM symbol, the first frame controls the offset of the symbol I path. 0, the Q path offset is 128, the second frame control symbol I way offset is 192, the Q way offset is 64, and the third frame control symbol I way offset is 160, The offset of the Q channel is 32, the offset of the fourth frame control symbol I is 96, and the offset of the Q channel is 224. The meaning of the offset is: when the first frame controls the copy of the symbol, the data copied on the a-th carrier is the ((a + offset) mod 256).
- the number of available subcarriers controlled by the frame is 411, the subcarrier number is 80 to 490, and the QPSK modulation mode is adopted, and there are 4 frame control symbols, and the offset amounts of the I channel and the Q channel are as shown in Table 4. Show.
- the number of available subcarriers for true control is 131, and the subcarrier number is 100 to 230.
- QPSK modulation is used, and there are 12 frame control symbols.
- the offsets of I and Q are shown in Table 5.
- Step 4. Encode the payload data.
- the frame-controlled Turbo coding only supports PB16, 1/2 code rate, and the payload Turbo coding supports PB72, PB136, PB256 and other modes, and supports 1/2 and 16/18 code rates.
- the coding method and flow are the same as the frame control except that the parameters are different when encoding.
- FIG. 6 is a flow chart of the load forward error correction code.
- the encoding process of the payload is: first performing scrambling, then performing turbo coding, then performing channel interleaving, and finally performing diversity copying. Specifically include:
- step 4a the payload data is scrambled.
- the scrambling method performs an exclusive-OR operation on the data stream and a repeated pseudo-random noise sequence. Pseudo random
- the scrambling code polynomial of the noise sequence is generated by a primitive polynomial.
- the scrambling polynomial can be:
- Step 4b) Turbo coding is performed on the scrambled payload data.
- each pair of information bits [u0, u1] is input, and the output system outputs the information bits, and the first component encoder is based on The input bit pair [u0, u1] outputs a parity bit p0; the input two information bits [u0, u1] pass through the Turbo interleaver, input component encoder 2, and output a parity bit q0.
- the [u0, u1] input after Turbo coding is encoded as [u0, u1, p0, q0].
- the component encoder of the payload data is the same as the frame-controlled component encoder.
- the polynomial of [15,13,11] can still be used.
- the Turbo interleaving of the payload data supports modes such as PB72, PB136, PB264, and PB520.
- PB72, PB136, and PB264 support 1/2 code rate
- PB520 supports 1/2 and 16/18 code rates.
- the Turbo interleaving is performed in units of two bits, the length of the interleaver is equal to the number of double bits of the original data block length, and the different PB blocks correspond to different interleaving lengths, as shown in Table 6.
- I(x) represents the address mapping of the Turbo interlace
- S() represents the lookup table
- mod represents the modulo operation
- div represents the division operation
- N represents the length of the interleaved block
- L represents the interleaving length of the two bits.
- the lookup tables of S of PB16, PB72, PB136, PB264, and PB520 are shown in Tables 7, 8, 9, 10, and 11, respectively.
- Step 4c performing channel interleaving on the turbo encoded payload data.
- the channel interleaving mode of the payload data is similar to the frame interleaving mode of the frame control.
- the data block mode supported by the frame control channel interleaving is PB16
- the code rate is 1/2
- the channel interleaving of the payload data supports B72, PB136, PB264, PB520 and other data block modes, in which PB72, PB136, PB264 support 1/2 code rate, PB520 supports 1/2 and 16/18 code rates, and the bit offset of the check bit in channel interleaving according to PB mode
- PB16 is a frame-controlled channel interleaving mode.
- step 4d the payload data subjected to channel interleaving is subjected to diversity copy.
- the frame control since the frame control only supports PB16, 1/2, code rate, the number of bits controlled by the frame is determined, the number of symbols is also agreed, and the offset is also agreed, so the copy control of the frame control is also corresponding to the copy position. definite.
- the diversity copy of the payload needs to determine the number of symbols required for copying, the offset when copying, etc. according to the size of the data block, the encoding rate, the number of times of copying, etc., and determine the copying method according to the known parameters and the calculated parameters.
- the diversity copy is used to diversity and map the original signal.
- the physical layer receives the MAC sublayer information according to the service model of FIG. 3.
- the MAC sublayer information includes a carrier mapping table, and the carrier mapping table specifies the coding rate of the physical layer, the modulation mode, the number of times of copying, the type of PB used, and the physical
- the layer performs diversity copy according to the mode specified by the carrier mapping table.
- the basic mode of diversity copy supported by the present invention is shown in Table 13, and the supported diversity copy expansion mode is as shown in Table 14.
- the present invention specifies the number of interleavers and the interleaving method of the interleaver according to the number of times of copying when performing diversity copying.
- the number of interleavers is as shown in Table 15.
- the interleaving method is: determining the interleave length according to the actually available number of subcarriers and the number of interleavers, and then performing interleaving according to the manner listed in the travel.
- Table 15 The number of times of diversity and the number of interleaving maps:
- parameters for copying need to be calculated.
- the parameters that the physical layer can obtain according to the carrier mapping table information are: physical layer payload coding rate, diversity number, PB type used, and parameters obtained through the carrier mapping table.
- the bits of the second diversity, the data of the second diversity is from the first PadBitsNum ⁇ 2*PadBitsNum-1 bits of the original data, and so on to the Nth diversity
- the UsedCarrierNum indicates the actual number of carriers used according to the number of interleavers
- CarrierNumPerGroup indicates The number of subcarriers in each part
- CarrierNumPerInter indicates the number of subcarriers corresponding to each interleaver
- BitsInLast OFDM indicates the number of bits of the original data contained in the last OFDM symbol when copying
- the data to be copied is 6 parts G1 G G6, and needs to be copied 4 times, and the shift parameter when copying is [0, 0, 1, 1], G1 represents all data in the first part, and I1 represents the carrier address generated by the first set of interleavers. If 4 diversity is performed, the number of two interleavers required for each part is 2.
- the interleaving parameters are the carrier addresses generated by the first and second sets of interleavers, and the results of the first partial data interleaving are G1(I1) and G1(I2), after which all parts of the first diversity are followed.
- the carrier addresses generated by the first and second sets of interleaving are copied; in the second subset, the interleaving parameters are the interleaved addresses generated by the third and fourth sets of interleavers, and the results of the first partial data interleaving are G1(I3), G1 ( I4), and G1(I3), G1(I4) are shifted according to the shifting parameter at the time of copying, and thereafter all parts of the second diversity are copied according to the carrier address generated by the third and fourth sets of interleaving;
- the secondary diversity copy mode is similar to the second diversity copy mode until the end of the copy.
- Step 5 Modulate the frame control data and the payload data separately. Specifically include:
- step 5a the frame control data and the payload data are separately mapped.
- the present invention adopts different mapping modes for frame control and payload data.
- frame control can be mapped by QPSK
- load data modulation mode can be extended, and methods such as BPSK, QPSK, and 16QAM are supported.
- the modulation mode is different.
- the number of bits of the frame control and payload data on each carrier is different. For example, for QPSK, the number of bits per carrier is 2, and for BPSK, the number of bits per carrier is 1.
- step 5b the mapped frame control data and the payload data are scrambled and modulated onto corresponding subcarriers.
- the frame control data and the payload data are scrambled after the mapping ends.
- the scrambling method is to add a twiddle factor to each subcarrier.
- the PN sequence can be selected.
- the scrambled phase number is shown in Table 16. The scrambling method is:
- X a constellation point indicating the payload data after scrambling
- X(k) represents a constellation point of the payload data before scrambling
- the scrambled frame control data and payload data are placed on the corresponding subcarriers, and for unused subcarriers, the value is set to zero.
- Fig. 13 shows a time domain waveform of a frame control symbol obtained after modulation.
- the horizontal axis represents the time domain points of the frame control signal
- the vertical axis represents the time domain amplitude of the frame control signal.
- Figure 14 shows the autocorrelation property of the frame control signal. It can be seen from the figure that the added rotation phase can ensure that the frame control signal has good autocorrelation properties.
- the power normalization factor is different depending on the modulation method. For example, if QPSK is used, the power normalization factor is If BPSK is used, the power normalization factor is 1.
- Step 7 Add a cyclic prefix (CP) to the time domain frame control symbol and the time domain payload symbol respectively to generate a complete OFDM frame control symbol and an OFDM payload symbol.
- CP cyclic prefix
- the frame control symbol and the payload symbol When adding a cyclic prefix, the frame control symbol and the payload symbol have different cyclic prefix lengths.
- the CP length of the frame control is 582 data points
- the CP length of the first and second symbols of the payload is also 582 data points.
- the CP length is 388 data points
- the CP length of the OFDM symbol is the sum of the guard interval and the roll-off interval of the OFDM symbol, as shown in FIG.
- the complete OFDM frame control symbol and OFDM payload symbol can be obtained by adding the CP.
- Step 8 Generate a frequency domain preamble symbol according to the preamble phase table in the frequency domain, and take the real part after the IFFT and perform power control to generate a time domain preamble signal.
- the format of the preamble signal is as shown in Fig. 10. It consists of 10.5 A and 2.5 -A. The first 0.5 A is the second half of A, and the last 0.5 -A is the first half of -A.
- a sequence of sequences B is generated in the frequency domain, which is generated in the following manner:
- X(k) represents a preamble sequence generated in the frequency domain, and k is a subcarrier symbol
- the reference phase is the selectable PN sequence; in practice, if the frequency band 0 is used, the phase number corresponding to the carrier number is 100-230, and if the frequency band 1 is used, Then, the phase number corresponding to the carrier number is 80 to 490.
- Fig. 11 shows a time domain waveform of a preamble obtained after modulation.
- the horizontal axis represents the number of time points of the preamble signal
- the vertical axis represents the time domain amplitude of the preamble signal.
- Figure 12 shows the autocorrelation properties of the preamble. As can be seen from the figure, the preamble has good autocorrelation properties.
- the N-point IFFT is obtained to obtain the corresponding time domain sequence A.
- the time domain sequence A is arranged, and the arranged sequence is taken into the real part, and is performed.
- the power signal can be used to obtain the preamble signal.
- phase reference table 17 is as follows, and the true phase is the reference phase multiplied by ⁇ /8.
- Step 9 For the time domain preamble, all OFDM frame control symbols and all OFDM payload symbols are windowed.
- the window function definition is shown in Table 18.
- the preamble the frame control and the data in the front roll-off interval plus the rising window, the data in the rear roll-off interval plus the window down.
- the preamble data the entire preamble is windowed with no overlap at the front and the back overlaps with the front of the first OFDM symbol of the frame control.
- frame control and payload data each OFDM symbol is windowed, and the frame control and payload data have no overlap except for the back of the last OFDM symbol, and the rest of the OFDM symbols overlap with the front of the next OFDM symbol. .
- Points Window Window drop 1 0 1 2 0.011764 0.988235 3 0.023529 0.976470 4 0.035294 0.964705 5 0.047058 0.952941 6 0.058823 0.941176 7 0.070588 0.929411 8 0.082352 0.917647 9 0.094117 0.905882 10 0.105882 0.894117 11 0.117647 0.882352 12 0.129411 0.870588 13 0.141176 0.858823 14 0.152941 0.847058 15 0.164705 0.835294 16 0.176470 0.823529 17 0.188235 0.811764 18 0.200000 0.800000 19 0.206741 0.793258
- Step 10 Generate a physical layer transmit signal of the OFDM into the analog front end.
- the physical layer transmission signal format of OFDM is shown in FIG. 4 .
- the transmit signal structure of the physical layer consists of a preamble, frame control, and data payload.
- the length of the preamble is 13*1024
- the length of the frame control and the data payload are both 1024
- the roll-off interval of the preamble is 124
- the roll-off interval of the frame control is also 124
- the guard interval of the frame control is 458,
- the protection interval of data payload 1 and data payload 2 is 458, and the remaining load interval is 264.
- the frame control signal selects the number of different symbols according to different frequency bands, and in the frequency band 0, that is, in the range of 1.953 to 11.96 MHz, the frame control The number of symbols is four; in the frequency band 1, that is, in the range of 2.441 to 5.615 MHz, the number of frame control symbols is 12.
- the OFDM-based broadband power line carrier communication physical layer receiving signal processing method of the present invention includes:
- the Fourier transformed data is demodulated to generate a frame control output and a load output.
- the demodulating the Fourier transformed data includes:
- the frame control data and the payload data after Turbo decoding are respectively output.
- the method further includes: performing descrambling on the payload data after the Turbo decoding.
- the embodiment of the invention further provides a signal processing device, comprising:
- a first memory configured to store an executable program
- the first processor configured to execute by executing the executable program stored in the first memory:
- the first processor is further configured to execute when the computer program is executed:
- the frame control data and the payload data that are interleaved by the channel are separately subjected to diversity copy.
- the first processor is further configured to: when the computer program is executed, perform scrambling on the payload data.
- the first processor is further configured to execute when the computer program is executed:
- the frame control data is encoded using a first component encoder and a second component encoder, respectively, wherein the input signal of the second component encoder is first subjected to Turbo interleaving.
- the first processor is further configured to: when the computer program is executed, perform: the Turbo interlace is interleaved in units of two bits, and the interleave length is equal to the number of double bits of the original data block length.
- the first processor is further configured to execute when the computer program is executed:
- the information bits are arranged in a column manner, and the information bits are scrambled by reading different lines; when the parity bit interleaving is performed, the offset address is obtained. Start reading, and the information bits are sorted out in columns, and the information bits are scrambled by reading different lines.
- the first processor is further configured to execute when the computer program is executed:
- the first processor is further configured to execute when the computer program is executed:
- the input bit data is copied to the frequency domain subcarrier, and the number of times of copying is determined according to requirements, thereby setting the offset difference between the I channel and the Q channel.
- the first processor is further configured to execute when the computer program is executed:
- the register state in the Turbo coded component encoder is related to the tail bit matrix, which is determined by the physical block size and the generator polynomial of the component encoder.
- the first processor is further configured to execute when the computer program is executed:
- the data of the link layer includes a carrier mapping table, where the coded bit rate, the modulation mode, the copy mode, and the adopted physical block type information of the physical layer are specified in the carrier mapping table; the physical layer is indexed according to the carrier mapping table.
- the specified mode is encoded.
- the first processor is further configured to execute when the computer program is executed:
- the number of diversity is 2, the number of interleavers is 8, and the number of interleavers per part is 4;
- the number of diversity is 4, the number of interleavers is 8, and the number of interleavers per part is 2;
- the number of diversity is 7
- the number of interleavers is 14, and the number of interleavers per part is 2.
- the number of diversity is 11, the number of interleavers is 11, and the number of interleavers per part is 1.
- the first processor is further configured to execute when the computer program is executed:
- the load data is divided into a plurality of parts and respectively copied, and each part has one or more interleavers, and the output of the interleaver is used as a mapping address of the subcarriers when each part is copied, and different interleaving is selected for each copy.
- Device The load data is divided into a plurality of parts and respectively copied, and each part has one or more interleavers, and the output of the interleaver is used as a mapping address of the subcarriers when each part is copied, and different interleaving is selected for each copy.
- the first processor is further configured to execute when the computer program is executed:
- the modulating the channel-encoded frame control data and payload data onto the subcarriers includes:
- the mapped frame control data and payload data are scrambled and modulated onto corresponding subcarriers.
- the processor is further configured to execute when the computer program is executed:
- the real control of the frame control data and the payload data after the inverse Fourier transform is respectively performed for power control.
- the first processor is further configured to execute when the computer program is executed:
- phase rotation factor is added to the frame control data and the payload data mapped through the constellation, and the phase rotation reference value is generated by pseudo-random, and the real phase is the reference phase multiplied by ⁇ /4, wherein the scrambling mode is:
- a constellation point indicating the scrambled payload data k represents a carrier number
- X(k) represents a constellation point of the payload data before scrambling
- the processor is further configured to execute when the computer program is executed:
- the reference phase includes a carrier number 1 to a carrier number 511.
- the first processor is further configured to execute when the computer program is executed:
- the frequency range is 1.953 ⁇ 11.96MHz, the starting number of the carrier is 80, and the cutoff number is 490;
- the frequency range is 2.441 to 5.615 MHz
- the starting number of the carrier is 100
- the cutoff number is 230.
- the first processor is further configured to execute when the computer program is executed:
- the frame time of the OFDM symbol of the frame control data and the payload data is 1024, the time is 40.96 ⁇ s; the roll-off interval is 124 points, the time is 4.96 ⁇ s; the guard interval of the frame control data is 458 points, and the time is 18.32 ⁇ s;
- the guard interval between the first symbol and the second symbol of the payload data is 458 points and the time is 18.32 ⁇ s; the guard interval after the third symbol of the payload data is 264 points and the time is 10.8 ⁇ s.
- the first processor is further configured to execute when the computer program is executed:
- the first processor is further configured to execute when the computer program is executed:
- a preamble sequence is generated according to a preamble phase table in the frequency domain, and is generated by:
- X(k) represents a preamble sequence generated in the frequency domain
- k is a subcarrier symbol
- the first processor is further configured to: when the computer program is executed, perform: the data format of the preamble is 10.5 A and 2.5 -A, wherein the first 0.5 A is the second half of A, and the last 0.5 -A is the first half of -A.
- the processor is further configured to: when the computer program is executed, perform: the preamble has a time domain point of 1024 and a time of 40.96 ⁇ s.
- the first processor is further configured to: when the computer program is executed, perform: the number of frame control signals is related to a frequency band used;
- the number of frame control signals is four;
- the number of frame control signals is 12.
- the embodiment of the invention further provides a signal processing device, comprising:
- a second memory configured to store an executable program
- a second processor configured to: when running the executable program stored in the second memory:
- the Fourier transformed data is demodulated to generate a frame control output and a load output.
- the second processor is further configured to execute when the computer program is executed:
- the frame control data and the payload data after Turbo decoding are respectively output.
- the second processor is further configured to execute when the computer program is executed:
- the embodiment of the invention further provides a storage medium storing an executable program, when the executable program is executed by the processor, executing:
- the frame control data and the payload data that are interleaved by the channel are separately subjected to diversity copy.
- the executable program When executed by the processor, it performs: scrambling the payload data.
- the executable program When the executable program is executed by the processor, it is executed that the Turbo interlace is interleaved in units of two bits, and the interleave length is equal to the number of double bits of the original data block length.
- the information bits are arranged in a column manner, and the information bits are scrambled by reading different lines; when the parity bit interleaving is performed, the offset address is obtained. Start reading, and the information bits are sorted out in columns, and the information bits are scrambled by reading different lines.
- the first processor is further configured to execute when the computer program is executed:
- the input bit data is copied to the frequency domain subcarrier, and the number of times of copying is determined according to requirements, thereby setting the offset difference between the I channel and the Q channel.
- the register state in the Turbo coded component encoder is related to the tail bit matrix, which is determined by the physical block size and the generator polynomial of the component encoder.
- the data of the link layer includes a carrier mapping table, and the carrier mapping table defines an object.
- the coding rate, the modulation mode, the copy mode, and the physical block type information used by the layer; the physical layer is coded according to the mode specified by the carrier mapping table index.
- the number of diversity is 2, the number of interleavers is 8, and the number of interleavers per part is 4;
- the number of diversity is 4, the number of interleavers is 8, and the number of interleavers per part is 2;
- the number of diversity is 7
- the number of interleavers is 14, and the number of interleavers per part is 2.
- the number of diversity is 11, the number of interleavers is 11, and the number of interleavers per part is 1.
- the load data is divided into a plurality of parts and respectively copied, and each part has one or more interleavers, and the output of the interleaver is used as a mapping address of the subcarriers when each part is copied, and different interleaving is selected for each copy.
- Device The load data is divided into a plurality of parts and respectively copied, and each part has one or more interleavers, and the output of the interleaver is used as a mapping address of the subcarriers when each part is copied, and different interleaving is selected for each copy.
- the modulating the channel-encoded frame control data and payload data onto the subcarriers includes:
- the mapped frame control data and payload data are scrambled and modulated onto corresponding subcarriers.
- the real control of the frame control data and the payload data after the inverse Fourier transform is respectively performed for power control.
- phase rotation factor is added to the frame control data and the payload data mapped through the constellation, and the phase rotation reference value is generated by pseudo-random, and the real phase is the reference phase multiplied by ⁇ /4, wherein the scrambling The way is:
- a constellation point indicating the scrambled payload data k represents a carrier number
- X(k) represents a constellation point of the payload data before scrambling
- the processor is further configured to execute when the computer program is executed:
- the reference phase includes a carrier number 1 to a carrier number 511.
- the frequency range is 1.953 ⁇ 11.96MHz, the starting number of the carrier is 80, and the cutoff number is 490;
- the frequency range is 2.441 to 5.615 MHz
- the starting number of the carrier is 100
- the cutoff number is 230.
- the frame time of the OFDM symbol of the frame control data and the payload data is 1024, the time is 40.96 ⁇ s; the roll-off interval is 124 points, the time is 4.96 ⁇ s; the guard interval of the frame control data is 458 points, and the time is 18.32 ⁇ s;
- the guard interval between the first symbol and the second symbol of the payload data is 458 points and the time is 18.32 ⁇ s; the guard interval after the third symbol of the payload data is 264 points and the time is 10.8 ⁇ s.
- a preamble sequence is generated according to a preamble phase table in the frequency domain, and is generated by:
- X(k) represents a preamble sequence generated in the frequency domain
- k is a subcarrier symbol
- the first processor is further configured to: when the computer program is executed, perform: the data format of the preamble is 10.5 A and 2.5 -A, wherein the first 0.5 A is the second half of A, and the last 0.5 -A is the first half of -A.
- the processor is further configured to: when the computer program is executed, perform: the preamble has a time domain point of 1024 and a time of 40.96 ⁇ s.
- the number of frame control signals is related to the frequency band used
- the number of frame control signals is four;
- the number of frame control signals is 12.
- An embodiment of the present invention further provides a storage medium storing an executable program, and when the executable program is executed by the processor, executing:
- the Fourier transformed data is demodulated to generate a frame control output and a load output.
- the frame control data and the payload data after Turbo decoding are respectively output.
- the above information processing apparatus of the present invention can also be stored in a computer readable storage medium if it is implemented in the form of a software function module and sold or used as a stand-alone product.
- the technical solution of the embodiments of the present invention may be embodied in the form of a software product in essence or in the form of a software product, which is stored in a storage medium and includes a plurality of instructions for making
- a computer device (which may be a personal computer, server, or network device, etc.) performs all or part of the methods described in various embodiments of the present invention.
- the foregoing storage medium includes various media that can store program codes, such as a mobile storage device, a RAM, a ROM, a magnetic disk, or an optical disk.
- the data from the link layer is received, and the data is divided into frame control data and payload data; channel control is performed on the frame control data and the payload data, respectively, and the frame control data after channel coding is performed. And loading the data onto the subcarrier; performing inverse Fourier transform on the modulated frame control data and the payload data, and separately performing power control to generate a time domain frame control symbol and a time domain payload symbol; and the time domain frame
- the control symbol and the time domain payload symbol are added with a cyclic prefix, and the time domain preamble symbol is added and then windowed to generate a physical layer transmission signal.
- the method has high frequency band utilization, high transmission rate, strong anti-code interference capability and strong anti-channel fading capability.
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Abstract
Description
| 符号 | 1 | 2 | 3 | 4 |
| I路 | 0 | 192 | 160 | 96 |
| Q路 | 128 | 64 | 32 | 224 |
| 物理块(字节数) | N | M | L |
| 16 | 8 | 8 | 64 |
| 72 | 18 | 16 | 288 |
| 136 | 34 | 16 | 544 |
| 264 | 33 | 32 | 1056 |
| 520 | 40 | 52 | 2080 |
| x | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| S(x) | 53 | 20 | 9 | 32 | 62 | 39 | 51 | 18 |
| x | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| S(x) | 1 | 200 | 255 | 166 | 221 | 132 | 187 | 98 |
| x | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
| S(x) | 153 | 64 | 119 | 30 | 85 | 284 | 51 | 250 |
| x | 16 | 17 | ||||||
| S(x) | 17 | 216 |
| x | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| S(x) | 383 | 68 | 262 | 180 | 484 | 363 | 302 | 152 |
| x | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
| S(x) | 405 | 529 | 97 | 11 | 333 | 509 | 40 | 198 |
| x | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 |
| S(x) | 236 | 454 | 428 | 124 | 273 | 493 | 73 | 389 |
| x | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 |
| S(x) | 162 | 293 | 2 | 211 | 467 | 252 | 411 | 183 |
| x | 32 | 33 | ||||||
| S(x) | 310 | 86 |
| x | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| S(x) | 309 | 175 | 737 | 667 | 1024 | 224 | 622 | 962 |
| x | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
| S(x) | 527 | 845 | 926 | 1052 | 366 | 54 | 249 | 784 |
| x | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 |
| S(x) | 108 | 551 | 410 | 479 | 823 | 866 | 442 | 654 |
| x | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 |
| S(x) | 321 | 33 | 85 | 610 | 730 | 765 | 1038 | 352 |
| x | 32 | |||||||
| S(x) | 954 |
| x | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| S(x) | 1183 | 32 | 425 | 1434 | 165 | 331 | 1574 | 1039 |
| x | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
| S(x) | 1084 | 1332 | 1513 | 536 | 213 | 1908 | 761 | 1231 |
| x | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 |
| S(x) | 1659 | 476 | 1842 | 809 | 2007 | 895 | 1717 | 1950 |
| x | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 |
| S(x) | 101 | 937 | 618 | 1606 | 704 | 1786 | 570 | 843 |
| x | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 |
| S(x) | 349 | 2038 | 1102 | 1260 | 235 | 40 | 648 | 1347 |
| 点数 | 升窗 | 降窗 |
| 1 | 0 | 1 |
| 2 | 0.011764 | 0.988235 |
| 3 | 0.023529 | 0.976470 |
| 4 | 0.035294 | 0.964705 |
| 5 | 0.047058 | 0.952941 |
| 6 | 0.058823 | 0.941176 |
| 7 | 0.070588 | 0.929411 |
| 8 | 0.082352 | 0.917647 |
| 9 | 0.094117 | 0.905882 |
| 10 | 0.105882 | 0.894117 |
| 11 | 0.117647 | 0.882352 |
| 12 | 0.129411 | 0.870588 |
| 13 | 0.141176 | 0.858823 |
| 14 | 0.152941 | 0.847058 |
| 15 | 0.164705 | 0.835294 |
| 16 | 0.176470 | 0.823529 |
| 17 | 0.188235 | 0.811764 |
| 18 | 0.200000 | 0.800000 |
| 19 | 0.206741 | 0.793258 |
| 20 | 0.213483 | 0.786516 |
| 21 | 0.220224 | 0.779775 |
| 22 | 0.226966 | 0.773033 |
| 23 | 0.233707 | 0.766292 |
| 24 | 0.240449 | 0.759550 |
| 25 | 0.247191 | 0.752808 |
| 26 | 0.253932 | 0.746067 |
| 27 | 0.260674 | 0.739325 |
| 28 | 0.267415 | 0.732584 |
| 29 | 0.274157 | 0.725842 |
| 30 | 0.280898 | 0.719101 |
| 31 | 0.287640 | 0.712359 |
| 32 | 0.294382 | 0.705617 |
| 33 | 0.301123 | 0.698876 |
| 34 | 0.307865 | 0.692134 |
| 35 | 0.314606 | 0.685393 |
| 36 | 0.321348 | 0.678651 |
| 37 | 0.328089 | 0.671910 |
| 38 | 0.334831 | 0.665168 |
| 39 | 0.341573 | 0.658426 |
| 40 | 0.348314 | 0.651685 |
| 41 | 0.355056 | 0.644943 |
| 42 | 0.361797 | 0.638202 |
| 43 | 0.368539 | 0.631460 |
| 44 | 0.375280 | 0.624719 |
| 45 | 0.382022 | 0.617977 |
| 46 | 0.388764 | 0.611235 |
| 47 | 0.395505 | 0.604494 |
| 48 | 0.402247 | 0.597752 |
| 49 | 0.408988 | 0.591011 |
| 50 | 0.415730 | 0.584269 |
| 51 | 0.422471 | 0.577528 |
| 52 | 0.429213 | 0.570786 |
| 53 | 0.435955 | 0.564044 |
| 54 | 0.442696 | 0.557303 |
| 55 | 0.449438 | 0.550561 |
| 56 | 0.456179 | 0.543820 |
| 57 | 0.462921 | 0.537078 |
| 58 | 0.469662 | 0.530337 |
| 59 | 0.476404 | 0.523595 |
| 60 | 0.483146 | 0.516853 |
| 61 | 0.489887 | 0.510112 |
| 62 | 0.496629 | 0.503370 |
| 63 | 0.503370 | 0.496629 |
| 64 | 0.510112 | 0.489887 |
| 65 | 0.516853 | 0.483146 |
| 66 | 0.523595 | 0.476404 |
| 67 | 0.530337 | 0.469662 |
| 68 | 0.537078 | 0.462921 |
| 69 | 0.543820 | 0.456179 |
| 70 | 0.550561 | 0.449438 |
| 71 | 0.557303 | 0.442696 |
| 72 | 0.564044 | 0.435955 |
| 73 | 0.570786 | 0.429213 |
| 74 | 0.577528 | 0.422471 |
| 75 | 0.584269 | 0.415730 |
| 76 | 0.591011 | 0.408988 |
| 77 | 0.597752 | 0.402247 |
| 78 | 0.604494 | 0.395505 |
| 79 | 0.611235 | 0.388764 |
| 80 | 0.617977 | 0.382022 |
| 81 | 0.624719 | 0.375280 |
| 82 | 0.631460 | 0.368539 |
| 83 | 0.638202 | 0.361797 |
| 84 | 0.644943 | 0.355056 |
| 85 | 0.651685 | 0.348314 |
| 86 | 0.658426 | 0.341573 |
| 87 | 0.665168 | 0.334831 |
| 88 | 0.671910 | 0.328089 |
| 89 | 0.678651 | 0.321348 |
| 90 | 0.685393 | 0.314606 |
| 91 | 0.692134 | 0.307865 |
| 92 | 0.698876 | 0.301123 |
| 93 | 0.705617 | 0.294382 |
| 94 | 0.712359 | 0.287640 |
| 95 | 0.719101 | 0.280898 |
| 96 | 0.725842 | 0.274157 |
| 97 | 0.732584 | 0.267415 |
| 98 | 0.739325 | 0.260674 |
| 99 | 0.746067 | 0.253932 |
| 100 | 0.752808 | 0.247191 |
| 101 | 0.759550 | 0.240449 |
| 102 | 0.766292 | 0.233707 |
| 103 | 0.773033 | 0.226966 |
| 104 | 0.779775 | 0.220224 |
| 105 | 0.786516 | 0.213483 |
| 106 | 0.793258 | 0.206741 |
| 107 | 0.800000 | 0.200000 |
| 108 | 0.811764 | 0.188235 |
| 109 | 0.823529 | 0.176470 |
| 110 | 0.835294 | 0.164705 |
| 111 | 0.847058 | 0.152941 |
| 112 | 0.858823 | 0.141176 |
| 113 | 0.870588 | 0.129411 |
| 114 | 0.882352 | 0.117647 |
| 115 | 0.894117 | 0.105882 |
| 116 | 0.905882 | 0.094117 |
| 117 | 0.917647 | 0.082352 |
| 118 | 0.929411 | 0.070588 |
| 119 | 0.941176 | 0.058823 |
| 120 | 0.952941 | 0.047058 |
| 121 | 0.964705 | 0.035294 |
| 122 | 0.976470 | 0.023529 |
| 123 | 0.988235 | 0.011764 |
| 124 | 1 | 0 |
Claims (30)
- 一种信号处理方法,包括:接收来自链路层的数据,将所述数据分为帧控制数据和载荷数据;分别对所述帧控制数据和载荷数据进行信道编码,并将信道编码后的帧控制数据和载荷数据调制到子载波上;对调制后的帧控制数据和载荷数据进行反傅里叶变换,并分别进行功率控制,生成时域帧控制符号和时域载荷符号;对所述时域帧控制符号和所述时域载荷符号加循环前缀,并加时域前导符号后再进行加窗处理,生成物理层发射信号。
- 如权利要求1所述的方法,其中,所述对所述帧控制数据和载荷数据进行的信道编码包括:分别对帧控制数据和载荷数据进行Turbo编码;分别对经过Turbo编码的帧控制数据和载荷数据进行信道交织;分别对经过信道交织的帧控制数据和载荷数据进行分集拷贝。
- 如权利要求2所述的方法,其中,在对所述载荷数据进行Turbo编码前,还包括:对所述载荷数据进行加扰。
- 如权利要求2所述的方法,其中,对所述帧控制数据进行Turbo编码包括:对所述帧控制数据分别使用第一分量编码器和第二分量编码器进行编码,其中,所述第二分量编码器的输入信号先经过Turbo交织。
- 如权利要求4所述的方法,其中,所述Turbo交织按照双比特为单位进行交织,交织长度等于原始数据块长度的双比特数量。
- 如权利要求2所述的方法,其中,对经过Turbo编码的帧控制数据进行信道交织时,将所述帧控制数据的信息位和校验位分开交织;其中,对经过Turbo编码的帧控制数据进行信息位交织时,将信息比 特按照列进行出的方式,通过读取不同行,将信息位打乱;进行校验位交织时,从偏移量地址开始读取,将信息比特按照列进行出的方式,通过读取不同行,将信息位打乱。
- 如权利要求6所述的方法,其中,在分别对所述帧控制数据的信息位和校验位交织后,再在所述信息位和校验位之间进行交织。
- 如权利要求2所述的方法,其中,对经过信道交织的帧控制数据进行分集拷贝时,将输入的比特数据拷贝到频域子载波上,并根据需求决定拷贝次数,以此设定I路和Q路的偏置差。
- 如权利要求2所述的方法,其中,对载荷数据进行Turbo编码时,Turbo编码分量编码器中的寄存器状态和咬尾矩阵相关,咬尾矩阵由物理块大小和分量编码器的生成多项式决定。
- 如权利要求2所述的方法,其中,所述链路层的数据包含有载波映射表,所述载波映射表中规定有物理层的编码码率、调制方式、拷贝方式、采用的物理块类型信息;所述物理层按照载波映射表索引规定的模式进行编码。
- 如权利要求2所述的方法,其中,对经过信道交织的载荷数据进行分集拷贝时,拷贝次数与拷贝时的交织器个数的关系为:分集次数为2时,交织器个数为8,每部分的交织器个数为4;分集次数为4时,交织器个数为8,每部分的交织器个数为2;分集次数为5时,交织器个数为10,每部分的交织器个数为2;分集次数为7时,交织器个数为14,每部分的交织器个数为2;分集次数为11时,交织器个数为11,每部分的交织器个数为1。
- 如权利要求11所述的方法,其中,将所述载荷数据分成多个部分分别进行拷贝,每个部分有一个或者多个交织器,将交织器输出的结果作为每个部分拷贝时子载波的映射地址,且每次拷贝选取不同的交织 器。
- 如权利要求1所述的方法,其中,所述将信道编码后的帧控制数据和载荷数据调制到子载波上包括:将信道编码后的帧控制数据和载荷数据分别进行星座图映射;对映射后的帧控制数据和载荷数据进行加扰,并调制到对应的子载波上。
- 如权利要求13所述的方法,其中,对调制后的帧控制数据和载荷数据进行反傅里叶变换后,分别取反傅里叶变换后的帧控制数据和载荷数据的实部进行功率控制。
- 如权利要求15所述的方法,其中,所述参考相位包含1号载波到511号载波。
- 如权利要求16所述的方法,其中,若采用0号频段,则其频段范围为1.953~11.96MHz,载波的起始编号为80,截止编号为490;若采用1号频段,则其频段范围为2.441~5.615MHz,载波的起始编号为100,截止编号为230。
- 如权利要求1所述的方法,其中,对帧控制数据及载荷数据添加循环前缀,生成OFDM符号;其中帧控制数据及载荷数据的OFDM符号时域点数为1024,时间为40.96μs;滚降间隔为124点,时间为4.96μs;帧控制数据的保护间隔为 458点,时间为18.32μs;载荷数据第一个符号和第二个符号的保护间隔为458点,时间为18.32μs;载荷数据第三个符号之后的保护间隔为264点,时间为10.8μs。
- 如权利要求1所述的方法,其中,所述时域前导符号由以下方法生成:在频域根据前导相位表产生频域前导符号;对所述频域前导符号进行反傅里叶变换并取实部进行功率控制,生成所述时域前导符号。
- 如权利要求18所述的方法,其中,所述前导的数据格式为10.5个A和2.5个-A,其中,开始的0.5个A是A的后半部分,最后的0.5个-A是-A的前半部分。
- 如权利要求18所述的方法,其中,所述前导的时域点数为1024,时间为40.96μs。
- 如权利要求1所述的方法,其中,帧控制信号的个数和采用的频段相关;若采用0号频段,则帧控制信号的个数为4个;若采用1号频段,则帧控制信号的个数为12个。
- 一种信号处理方法,包括:从模拟前端接收数据信号后,对所述数据信号进行增益处理;对经增益处理后的数据信号进行时钟/帧同步;对时钟/帧同步后的数据进行傅里叶变换;将傅里叶变换后的数据进行解调,生成帧控制输出和载荷输出。
- 如权利要求24所述的方法,其中,所述将傅里叶变换后的数据进行解调包括:将所述傅里叶变换后的数据分为帧控制数据和载荷数据;分别对所述帧控制数据和载荷数据进行分集合并;分别对分集合并后的帧控制数据和载荷数据进行信道解交织;分别对信道解交织后的帧控制数据和载荷数据进行Turbo解码;分别输出Turbo解码后的帧控制数据和载荷数据。
- 如权利要求25所述的方法,其中,对所述载荷数据进行Turbo解码后,还包括:对所述Turbo解码后的载荷数据去扰。
- 一种信号处理装置,包括:第一存储器,配置为存储可执行程序;第一处理器,配置为通过执行所述第一存储器中存储的可执行程序时,实现权利要求1-23所述的信号处理方法。
- 一种信号处理装置,包括:第二存储器,配置为存储可执行程序;第二处理器,配置为通过执行所述第二存储器中存储的可执行程序时,实现权利要求24-26所述的信号处理方法。
- 一种存储介质,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1-23任一项所述的信号处理方法。
- 一种存储介质,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24-26任一项所述的信号处理方法。
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