GB2562375A

GB2562375A - Signal processing method and device, and storage medium

Info

Publication number: GB2562375A
Application number: GB1805152.4A
Authority: GB
Inventors: Zhang Hailong; Liu Xuan; Tang Yue
Original assignee: State Grid Corp of China SGCC; China Electric Power Research Institute Co Ltd CEPRI
Current assignee: State Grid Corp of China SGCC; China Electric Power Research Institute Co Ltd CEPRI
Priority date: 2016-12-09
Filing date: 2017-10-26
Publication date: 2018-11-14
Anticipated expiration: 2037-10-26
Also published as: CN106603457B; WO2018103471A1; GB201805152D0; CN106603457A; DE112017000223B4; DE112017000223T5; GB2562375B

Abstract

Disclosed is a signal processing method, comprising: receiving data from a link layer, and dividing the data into frame control data and payload data; performing channel encoding on the frame control data and the payload data, respectively, and modulating the channel encoded frame control data and payload data onto a subcarrier; performing an inverse Fourier transform operation on the modulated frame control data and payload data, and respectively performing power control to generate a time-domain frame control symbol and a time-domain payload symbol; and adding cyclic prefixes to the time-domain frame control symbol and the time-domain payload symbol, adding time-domain preamble symbols, and performing windowing processing to generate a physical layer transmission signal. Also disclosed are another signal processing method, two signal processing devices, and two storage mediums.

Description

SIGNAL PROCESSING METHOD AND DEVICE, AND STORAGE MEDIUM

CROSS-REFERENCE TO RELATED APPLICATION

The present application claims benefit of China Patent Application No. 201611128977.7, filed on December 9, 2016, the contents of which are hereby incorporated by reference in its entirety.

TECHNICAL FIELD

The disclosure relates to the technical field of Power Line Communications (PLC), and in particular to a method for generating an Orthogonal Frequency Division Multiplexing (OFDM)-based PLC physical-layer-transmitting signal, applied to a PLC system.

BACKGROUND

The PLC is a cable communication technology for transmitting and receiving communication signals by utilizing power wiring. As power line networks are distributed widely and when a power line is used as a communication medium, it is unnecessary to reconstruct a communication network by indoor punching and wiring. The PLC has the advantages of low cost, convenient connection and the like. Therefore, application of the power line to smart power grids and broadband access gets more and more attention.

The performance of the PLC is mainly restricted by a PLC channel. Due to a good high voltage power line channel environment of lOkV or more, a power line carrier telephone using a medium-and-high voltage power line as a signal transmission channel has been widely applied. A low voltage power grid is not designed for transmitting high-speed data, and an assembly in the low voltage power grid is designed on the basis of a strategy of minimizing an electric energy transmitting loss and reliably transmitting a low-frequency current. Therefore, during signal transmission on a low voltage power line, there will be many problems such as complex interference noise, small line impedance and strong signal attenuation.

SUMMARY

The embodiments of the disclosure provide a signal processing method and device, and a storage medium, capable of endowing a signal with a high band utilization rate, a high transmission rate, a strong inter-symbol interference resistance and a strong channel fading resistance.

The technical solutions in the embodiments of the disclosure are implemented as follows.

The embodiment of the disclosure provides a signal processing method, including the steps as follows.

Data from a link layer is received, and the data is divided into frame control data and payload data.

Channel coding is performed on the frame control data and the payload data respectively, and the channel-coded frame control data and payload data are modulated to a subcarrier.

Inverse Fast Fourier Transform (IFFT) is performed on the modulated frame control data and payload data, and power control is performed respectively, so as to generate a time domain frame control symbol and a time domain payload symbol.

Cyclic Prefixes (CP) are added to the time domain frame control symbol and the time domain payload symbol, a time domain preamble symbol is added, and then windowing is performed, so as to generate a physical-layer-transmitting signal.

In the above-mentioned solutions, the step that channel coding is performed on the frame control data and the payload data respectively includes the sub-steps as follows.

Turbo coding is performed on the frame control data and the payload data respectively.

Channel interleaving is performed on the Turbo-coded frame control data and payload data respectively.

Diversity copying is performed on the channel-interleaved frame control data and payload data respectively.

In the above-mentioned solutions, before performing Turbo coding on the payload data, the method further includes: scrambling the payload data.

In the above-mentioned solutions, the step that Turbo coding is performed on the frame control data includes the sub-step as follows.

The frame control data is coded by using a first component coder and a second component coder respectively, wherein an input signal of the second component coder is subjected to Turbo interleaving first.

In the above-mentioned solutions, the Turbo interleaving is performed in dualbits, an interleaving length being equal to a number of dual-bits of an original data block length.

In the above-mentioned solutions, when channel interleaving is performed on the Turbo-coded frame control data, information bits and check bits of the frame control data are interleaved separately, wherein when the information bits of the Turbo-coded frame control data are interleaved, the information bits are disorganized by reading different rows in a column-in row-out mode; and when the check bits are interleaved, the information bits are disorganized by reading different rows from an offset address in a column-in row-out mode.

In the above-mentioned solutions, after the information bits and check bits of the frame control data are interleaved separately, interleaving is performed between the information bits and the check bits.

In the above-mentioned solutions, when diversity copying is performed on the channel-interleaved frame control data, input bit data is copied to a frequency domain subcarrier, and a copy count is determined as demanded, so as to set an offset difference between an I path and a Q path. In the above-mentioned solutions, when Turbo coding is performed on the payload data, a state of a register and a tail-biting matrix in the component coder are Turbo-coded to be correlated, the tail-biting matrix being determined by the size of a Physical Block (PB) and a generating polynomial of the component coder.

In the above-mentioned solutions, data of the link layer contains a carrier mapping table, in which a coding rate, a modulation mode, a copying mode and adopted PB type information for the physical layer are specified; and the physical layer performs coding in a mode specified in indexes of the carrier mapping table.

In the above-mentioned solutions, when diversity copying is performed on the channel-interleaved payload data, a relationship between a copying count and the number of interleavers for copying is as follows.

When a diversity count is 2, the number of interleavers is 8, and the number of interleavers in each part is 4.

When the diversity count is 4, the number of interleavers is 8, and the number of interleavers in each part is 2.

When the diversity count is 5, the number of interleavers is 10, and the number of interleavers in each part is 2.

When the diversity count is 7, the number of interleavers is 14, and the number of interleavers in each part is 2.

When the diversity count is 11, the number of interleavers is 11, and the number of interleavers in each part is 1.

In the above-mentioned solutions, the payload data is divided into multiple parts that are copied respectively, each part has one or more interleavers, a result output by the interleaver serves as a mapping address of a subcarrier during copying of each part, and different interleavers are selected for each copying.

In the above-mentioned solutions, the step that the channel-coded frame control data and payload data are modulated to a subcarrier includes the sub-steps as follows.

Constellation mapping is performed on the channel-coded frame control data and payload data respectively.

The mapped frame control data and payload data are scrambled, and modulated to a corresponding subcarrier.

In the above-mentioned solutions, after IFFT is performed on the modulated frame control data and payload data, real parts of the frame control data and the payload data, subjected to IFFT are taken respectively to perform power control.

In the above-mentioned solutions, phase rotation factors are added to the constellation-mapped frame control data and payload data, a phase rotation reference value is generated pseudo-randomly, and a real phase is a reference phase multiplied by π/4, wherein a scrambling scheme is:

where represents a constellation point of a scrambled payload data, k

represents a carrier number, represents a constellation point of a non- scrambled payload data, and represents a rotation factor generated randomly, and is a group of PN sequences.

In the above-mentioned solutions, the reference phase contains carrier 1 to carrier 511.

In the above-mentioned solutions, when band 0 is adopted, a band range of the band 0 is 1.953 to 11.96MHz, numbers of carriers begin from 80, and end with 490; and when band 1 is adopted, a band range of the band 1 is 2.441 to 5.615MHz, numbers of carriers begin from 100, and end with 230.

In the above-mentioned solutions, CPs are added to the frame control data and the payload data, so as to generate an OFDM symbol, wherein OFDM symbols of the frame control data and the payload data have a time domain point number 1024, which is 40.96ps in time; a roll-off interval is 124 points, which is 4.96ps in time; a guard interval of the frame control data is 458 points, which is 18.32ps in time; a guard interval between a first symbol and a second symbol of the payload data is 458 points, which is 18.32ps in time; and a guard interval after a third symbol of the payload data is 264 points, which is 10.8ps in time.

In the above-mentioned solutions, the time domain preamble symbol is generated by means of the following. A frequency domain preamble symbol is generated in a frequency domain according to a preamble phase table. IFFT is performed on the frequency domain preamble symbol, and a real part is taken to perform power control, so as to generate the time domain preamble symbol.

In the above-mentioned solutions, a preamble sequence is generated in a frequency domain according to a preamble phase table by using a method:

where represents a preamble sequence generated in a frequency domain, is a subcarrier symbol, represents a reference phase generated randomly, and a corresponding phase number is a group of PN sequences.

In the above-mentioned solutions, the preamble has a data format of 10.5 As

and 2.5 -As, where a beginning 0.5 A of the 10.5As is a second half part of one A, and a last 0.5 -A of the 2.5 -As is a first half part of one -A.

In the above-mentioned solutions, a time domain point number of the preamble is 1024, and time is 40.96 .

In the above-mentioned solutions, the number of frame control signals is correlated to an adopted band, wherein if band 0 is adopted, the number of frame control signals is 4; and if band 1 is adopted, the number of frame control signals is 12.

The disclosure also discloses a signal processing method, including the steps as follows. A data signal is received from an analog front end, and then the data signal is gained.

Clock/frame synchronization is performed on the gained data signal.

Fourier transform is performed on data subjected to clock/frame synchronization.

The data subjected to Fourier transform is demodulated, so as to generate a frame control output and a payload output.

In the above-mentioned solutions, the step that the data subjected to Fourier transform is demodulated includes the sub-steps as follows.

The data subjected to Fourier transform is divided into frame control data and payload data.

Diversity combination is performed on the frame control data and the payload data respectively.

Channel deinterleaving is performed on the diversity-combined frame control data and payload data respectively.

Turbo decoding is performed on the channel-deinterleaved frame control data and payload data respectively.

Turbo-decoded frame control data and payload data are output respectively.

In the above-mentioned solutions, after Turbo decoding is performed on the payload data, the method further includes: descrambling the turbo-decoded payload data.

The embodiment of the disclosure also provides a signal processing apparatus, including: a first memory, configured to store an executable program; and a first processor, configured to implement, by executing the executable program stored in the first memory, the following operations: receiving data from a link layer, and dividing the data into frame control data and payload data; performing channel coding on the frame control data and the payload data respectively, and modulating the channel-coded frame control data and payload data to a subcarrier; performing IFFT on the modulated frame control data and payload data, and performing power control respectively, so as to generate a time domain frame control symbol and a time domain payload symbol; and adding CPs and a time domain preamble symbol to the time domain frame control symbol and the time domain payload symbol, and then performing windowing, so as to generate a physical-layer-transmitting signal.

The embodiment of the disclosure also provides a signal processing apparatus, including: a second memory, configured to store an executable program; and a second processor, configured to implement, by executing the executable program stored in the second memory, the following operations: receiving a data signal from an analog front end, and then gaining the data signal; performing clock/frame synchronization on the gained data signal; performing Fourier transform on data subjected to clock/frame synchronization; and demodulating the data subjected to Fourier transform, so as to generate a frame control output and a payload output.

The embodiment of the disclosure also provides a storage medium, which stores an executable program, wherein when the executable program is operated by a processor, the processor executes the following operations: receiving data from a link layer, and dividing the data into frame control data and payload data; performing channel coding on the frame control data and the payload data respectively, and modulating the channel-coded frame control data and payload data to a subcarrier; performing IFFT on the modulated frame control data and payload data, and performing power control respectively, so as to generate a time domain frame control symbol and a time domain payload symbol; and adding CPs and a time domain preamble symbol to the time domain frame control symbol and the time domain payload symbol, and then performing windowing, so as to generate a physical-layer-transmitting signal.

The embodiment of the disclosure also provides a storage medium, which stores an executable program, wherein when the executable program is operated by a processor, the processor executes the following operations: receiving a data signal from an analog front end, and then gaining the data signal; performing clock/frame synchronization on the gained data signal; performing Fourier transform on data subjected to clock/frame synchronization; and demodulating the data subjected to Fourier transform, so as to generate a frame control output and a payload output.

The signal processing method according to the disclosure has a high band utilization rate, a high transmission rate, a strong inter-symbol interference resistance and a strong channel fading resistance. The disclosure, adopting schemes such as Turbo coding and channel interleaving, has a strong error correcting capability and a strong channel fading resistance, performs diversity copying to transmit different copies of the same data, increases the diversity gain of a system, and improves the robustness of the system. During constellation mapping, a pseudo-random phase rotation factor is added, such that the phase of an OFDM symbol is randomized. Therefore, the peak-to-average ratio of the OFDM symbol is reduced, and the power amplification efficiency of the system can be improved.

BRIEF DESCRIPTION OF DRAWINGS FIG. lisa block diagram of a generation flow of a physical-layer-transmitting signal according to the disclosure. FIG. 2 is a receiving demodulation exemplary embodiment corresponding to a frame signal according to the disclosure. FIG. 3 is a physical layer serving model according to the disclosure. FIG. 4 is a structure diagram of frame data according to the disclosure. FIG. 5 is a flowchart of a forward error correcting code of frame control data according to the disclosure. FIG. 6 is a flowchart of a forward error correcting code of payload data according to the disclosure. FIG. 7 is a structure diagram of a Turbo coder according to the disclosure. FIG. 8 is a structure diagram of a Turbo component coder according to the disclosure. FIG. 9 is a flowchart of scrambling according to the disclosure. FIG. 10 is a format schematic diagram of preamble data according to the disclosure. FIG. 11 is a time domain graph of a preamble sequence generated by utilizing a preamble phase table according to the disclosure. FIG. 12 is a self-correlation characteristic of a preamble sequence generated by utilizing a preamble phase table according to the disclosure. FIG. 13 is a time domain graph of a frame control sequence generated by utilizing a frame control and payload phase table according to the disclosure. FIG. 14 is a self-correlation characteristic of a frame control sequence generated by utilizing a frame control and payload phase table according to the disclosure. FIG. 15 is a parameter defining graph during diversity copying according to the disclosure. FIG. 16 is an embodiment during diversity copying according to the disclosure. FIG. 17 is a time sequence of an OFDM symbol according to the disclosure.

DETAILED DESCRIPTION

The disclosure will be further illustrated below with the drawings and specific embodiments, such that those skilled in the art may better understand the disclosure and can implement the disclosure, but the embodiments are not used to limit the disclosure.

The OFDM technology implements parallel data transmission by converting a serial high-speed transmission data stream to parallel low-speed data streams and modulating data in the parallel low-speed data streams onto mutually-orthogonal subcarriers. The OFDM technology has the advantages of strong inter-symbol interference resistance, strong fading resistance, strong burst noise resistance, high spectrum utilization rate and the like. By means of power line channel characteristics, attenuation of a power line channel and various introduced noises and interferences can be resisted in a PLC by utilizing the OFDM technology, so as to meet requirements of smart power grids for reliability, security, timeliness and the like.

The disclosure mainly provides a method for generating an OFDM-based PLC physical-layer-transmitting signal.

Communication bands used in the disclosure are as shown in Table 1.

Table 1 Communication band

Herein, band 0 and band 1 are bands used currently, and bands 2 to 4 are reserved bands.

An OFDM symbol adopted in the disclosure is subjected to 25MHz-based clock sampling in time domain, and a time domain point number thereof is as shown in Table 2.

Table 2 OFDM symbol characteristic

A transmitting signal at a physical layer in the disclosure structurally consists of a preamble, a frame control and a payload, where the preamble consists of 13 OFDM symbols, a data format of the preamble is shown in FIG. 10, i.e., 10.5 As and 2.5 -As, where a beginning 0.5 A of the 10.5As is a second half part of one A, and a last 0.5 -A of the 2.5 -As is a first half part of one -A, and A represents an OFDM symbol. The number of symbols used in a frame control signal is shown in Table 3, 4 frame control symbols are adopted at band 0, and 12 frame control symbols are adopted at band 1.

Table 3 Frame control number

As shown in FIG. 1, the method for generating an OFDM-based PLC physical-layer-transmitting signal in the disclosure includes the specific implementation steps as follows.

In step 1, a physical layer receives an input from a data link layer, particularly an input from a Media Access Control (MAC) sub-layer.

In step 2, the physical layer divides data from the MAC sub-layer into frame control data and payload data, and the frame control data and the payload data are coded separately.

In step 3, the frame control data is coded. FIG. 5 shows a flowchart of a forward error correcting code of a frame control. From this figure, it can be seen that a frame control coding flow is: performing Turbo coding, then performing channel interleaving, and finally, performing diversity copying. The flow specifically includes the steps as follows.

In step 3a), Turbo coding is performed on frame control data.

The length of a Turbo coding block of a frame control is PBI6, a code rate is 1/2, and a final Turbo output is 256 bits, where the first 128 bits are information codes, and the last 128 bits are check codes. FIG. 7 is a structure diagram of a Turbo coder. The working flow of the Turbo coder is: each time a pair of information bits [uO,ul] is input, an output system outputs this pair of information bits, and meanwhile, a first component coder outputs a check bit pO according to the input bit pair [uO,ul]; and the two input information bits [uO,ul] are input into a second component coder via a Turbo interleaver, and a check bit qO is output. The input [uO,ul] is coded to [uO,ul,pO,qO] through Turbo coding. The Turbo interleaver is used to interleave original data, which are then served as an input of the second component coder. The Turbo interleaver performs interleaving in dual-bits, an interleaving length being equal to a number of dual-bits of an original data block length, where the dualbit refers to two bits, and during interleaving, two bits are taken as a unit for interleaving. Due to interleaving in dual-bits, the interleaving length is equal to an array of dual-bits. If a data bit number is 128 and 2 bits are taken as a unit, the interleaving length is 64. FIG. 8 is an exemplary embodiment of a component coder. In the embodiment, binary coding is adopted, there are three state registers, a generating polynomial thereof may be expressed as θ [15 13 ll], a corresponding binary' , .,. [1111,1101,10111 polynomial is L J.

In step 3b), channel interleaving is performed on the Turbo-coded frame control data.

The sequence of data information bits and check bits generated by Turbo coding is identical to that before coding, and the information bits are in front of the check bits. If K represents the number of information bits, N-K represents the number of check bits, K information bits are divided into four sub-blocks, the size of each sub-block is K/4 bits; and N-K check bits are divided into four sub-blocks, and the size of each sub-block is (N-K)/4 bits.

When information codes are interleaved, the information codes output by Turbo coding are written into a matrix storage space, a coder sequentially outputs a first block (K/4 bit) of information bits into a block 1, outputs a second block (K/4 bit) into a block 2, outputs a third block (K/4 bit) into a block 3, and outputs a fourth block (K/4 bit) into a block 4. Equivalently, the information bits are stored in a K/4-row 4-column matrix, where the first column represents the block 1, the second column represents the block 2, the third column represents the block 3, and the fourth column represents the block 4. During interleaving, four bits in each row are read out simultaneously. When data is read from the matrix, starting from a row 0, an interleaving StepSize is incremented each time a first-row address is read, so that a first-round row address reading sequence is (0, StepSize, 2*StepSize, ...); after [K/4]/StepSize rows are read, the tail of the matrix is reached, and then a next round of reading a row first address is added with 1; then, an interleaving StepSize is incremented each time a row address is read, [K/4]/StepSize rows are read, and then the tail is reached again; a second-round row address reading sequence is (1, 1+StepSize, l+2*StepSize, ...), and then a third-round row address is added with 1 to be 2; and by that analogy, all rows are completely read after StepSize rounds.

When the check codes are interleaved, a mode of storing the check codes into a matrix storage space is the same as a mode of storing the information codes. When a code rate is 1/2, a check bit reading method is similar to an information bit reading method. The difference lies in that the check bits are read for the first time starting from a row defined by an interleaving offset, and an interleaving step size is StepSize. In the present embodiment, T=(N-K)/4 is defined, a first-round row reading sequence is (offset, (offset+StepSize)mod T, (offset+2*StepSize)mod T, ...), then a second-round first row is added with 1, StepSize-1 rounds are repeated, and finally, StepSize rounds are completed, T/StepSize rows of data are read in each of the StepSize rounds, totally reading T rows of data. When a code rate is 16/18, a row pointer is not initialized after reading in each round, but reading is started continuously for (offset, (offset+StepSize)mod T, (offset+2*StepSize)mod T, ...) until T rows are read completely.

After the information bits and the check bits are interleaved separately, it is necessary to continue to perform interleaving between the information bits and the check bits. Different interleaving modes are set according to different code rates. For example, when a code rate is 1/2, the output first four bits are information codes, and the subsequent four bits are check codes, and so on. After interleaving, shift is performed in 4 bits, and the sequence is adjusted in every two four-bits.

In step 3 c), diversity copying is performed on the channel-interleaved frame control data.

Diversity copying is copying input original bit data to different frequency domain subcarriers, thereby contf buting to further constellation point mapping. If an input bit number of a frame control is 256, an offset difference between an I-path address and a Q-path address is set as 128 for copying; if four frame control OFDM symbols are adopted, an I-path offset of the first frame control symbol is 0, a Q-path offset of the first frame control symbol is 128, an I-path offset of the second frame control symbol is 192, a Q-path offset of the second frame control symbol is 64, an I-path offset of the third frame control symbol is 160, a Q-path offset of the third frame control symbol is 32, an I-path offset of the fourth frame control symbol is 96, and a Q-path offset of the fourth frame control symbol is 224. The offset means: during copying of the first frame control symbol, data copied on an ath carrier is ((a+offset)mod256)th

In the disclosure, at band 0, an available subcarrier number of a frame control is 411, a subcarrier number is 90 to 490, a QPSK modulation mode is adopted, there are four frame control symbols, and I-path and Q-path offsets are shown in Table 4. At band 1, an available subcarrier number of a frame control is 131, a subcarrier number is 100 to 230, a QPSK modulation mode is adopted, there are 12 frame control symbols, and I-path and Q-path offsets are shown in Table 5.

Table 4 I-path and Q-path offsets of frame control at band 0

Table 5 I-path and Q-path offsets of frame control at band 1

In step 4, the payload data is coded.

Turbo coding of a frame control only supports PBI6 and a code rate 1/2, and Turbo coding of a payload supports modes such as PB72, PB136 and PB256, and supports two code rates 1/2 and 16/18. However, during Turbo coding, a coding scheme and flow for the payload are the same as those for the frame control, while coding parameters are different. FIG. 6 is a flowchart of a forward error correcting code of the payload. From this figure, it can be seen that a payload coding flow is: performing scrambling, performing Turbo coding, then performing channel interleaving, and finally, performing diversity copying. The flow specifically includes the steps as follows.

In step 4a), payload data are scrambled. A scrambling scheme is: executing an exclusive OR operation on a data stream and a repeated pseudo-random noise sequence. A scrambling polynomial of the pseudo-random noise sequence is generated by a primitive polynomial. For example, the scrambling polynomial may be: 5(x) = X10+X3+1

The above formula represents that each time an item of data is input, the scrambling polynomial is shifted leftwards for one bit, the exclusive OR operation is executed on third and tenth bits thereof, and the exclusive OR operation is also executed on an output result and input data, so that output data can be obtained. The flowchart is shown in FIG. 9.

In step 4b), Turbo coding is performed on the scrambled payload data.

During Turbo coding on the payload load, the coding scheme used is similar to the coding scheme for a frame control. Each time a pair of information bits [uO,ul] is input, an output system outputs this pair of information bits, and meanwhile, a first

component coder outputs a check bit pO according to the input bit pair [uO,ul]; and the two input information bits [uO,ul] are input into a second component coder via a Turbo interleaver, and a check bit qO is output. The input [uO,ul] is Turbo coded to [uO,ul,pO,qO],

The component coder of the payload data is the same as the component coder of the frame control, and a polynomial [15,13,11] can be still adopted, where a method for calculating a state register of the component coder is as follows: firstly, an initial state is set as [S01,S02,S03] [0,0,0]. an information code is input until the last bit is input; a component coder 1 directly inputs an information code, so as to obtain a final state of the state register, and a component coder 2 inputs an information code via a Turbo interleaver, so as to obtain a final state of the state register, the final state of the register being expressed by [SN1,SN2,SN3]. finally, a tail-biting matrix of the state register is determined according to a PB size, if the PB size is 264, the tail-biting matrix is

and SO = SN * M serves as an initial state of the component coder.

Turbo interleaving of payload data supports modes such as PB72, PB136, PB264 and PB520, wherein PB72, PB136 and PB264 support a code rate 1/2, and PB520 supports two code rates 1/2 and 16/18. Turbo interleaving is performed in dual-bits, the length of an interleaver being equal to the number of dual-bits of an original data block length. Different PBs correspond to different interleaving lengths, as shown in Table 6.

Table 6 Turbo interleaving parameter table

Turbo interleaving address mapping is defined as:

where represents Turbo interleaving address mapping, ) represents a lookup table, mod represents a modulo operation, div represents an exact division operation, N represents the length of an interleaving block, and T represents an interleaving length of dual-bits, where lookup tables of S of PB16, PB72, PB136, PB264 and PB520 are shown in Tables 7, 8, 9, 10 and 11 respectively.

Table 7 S lookup table of PB16

Table 8 S lookup table of PB72

Table 9 S lookup table of PB136

Table 10 S lookup table of PB264

Table 11 S lookup table of PB520

In step 4c), channel interleaving is performed on the Turbo-coded payload data.

The channel interleaving mode of payload load is similar to a channel interleaving mode of frame control data. The difference lies in that a data block mode supported by channel interleaving for frame control data is PB16, a code rate is 1/2, and channel interleaving for payload data supports data block modes such as B72, PB136, PB264 and PB520, where PB72, PB136 and PB264 support the code rate 1/2, PB520 supports two code rates 1/2 and 16/18, there may be different check bit offsets according to different PB modes during channel interleaving, and channel interleaving

may select parameters in Table 12, where PB16 is a channel interleaving mode of a frame control.

Table 12 Channel interleaving parameter

In step 4d), diversity copying is performed on the channel-interleaved payload data.

As the frame control only supports PBI6 and a code rate 1/2, a bit number of the frame control is determined, a symbol number is predetermined, and an offset thereof is also predetermined, so that a copying position corresponding to diversity copying on the frame control is also determined.

The number of symbols needed for diversity copying on a payload, an offset used in the copying and the like are determined according to parameters such as the size of a data block, a coding rate and a copying count, and a copying scheme is determined according to known parameters and calculated parameters.

The diversity copying is used for diversity and mapping of original signals, and when a diversity count is 1, this link may be omitted. A physical layer receives MAC sub-layer information according to a serving model in FIG. 3, wherein the MAC sub-layer information contains a carrier mapping table, a coding rate of the physical layer, a modulation mode, a diversity copying count and adopted PB type information are specified in the carrier mapping table, and the physical layer performs diversity copying according to the modes provided in the carrier mapping table. A diversity copying basic mode supported in the disclosure is shown in Table 13, and a supported diversity copying extended mode is shown in Table 14.

Table 13 Diversity copying basic mode

Table 14 Diversity copying extended mode

In the disclosure, during diversity copying, the number of interleavers for copying and an interleaving scheme of an interleaver are provided according to a copying count, where the number of interleavers is shown in Table 15. The interleaving scheme is: determining an interleaving length according to the number of practically available subcarriers and the number of interleavers, and performing interleaving in a row-in column-out mode.

Table 15 Diversity count and interleaving number mapping table

During diversity copying, it is necessary to calculate parameters during copying, parameters that can be obtained by the physical layer according to carrier mapping table information include: a physical layer payload coding rate, a diversity count and an adopted PB type, and parameters needed during diversity copying can be calculated by means of the parameters obtained in the carrier mapping table, as shown

in FIG. 15, where PadBitsNum represents the number of bits to be filled during copying. It is supposed that there are N diversity copies. Data of the first diversity comes from bit 0 to bit PadBitsNum-1, data of the second diversity comes from bit PadBitsNum to bit 2*PadBitsNum-l, and the Nth diversity is analogized. UsedCarrierNum represents the number of actually-used carriers determined according to the number of interleavers, CarrierNumPerGroup represents the number of subcarriers in each part, CarrierNumPerlnter represents the number of subcarriers corresponding to each interleaver, and BitsInLastOFDM represents a bit number of original data contained in the last OFDM symbol during copying.

The diversity copying scheme is introduced below with the embodiment. As shown in FIG. 16, in the embodiment, data to be copied are divided into six parts G1 to G6, and are to be copied for four times. A shift parameter during copying is [0,0,1,1], G1 represents all data in the first part, and II represents a carrier address generated by a first group of interleavers. If diversity is performed for four times, the number of interleavers needed in each part is 2. During the first diversity, an interleaving parameter is a carrier address generated by first and second groups of interleavers, results obtained by interleaving data in the first part are G1(I1) and G1(I2), and then all parts during the first diversity are copied according to the carrier address generated by the first and second groups of interleavers. During the second diversity, an interleaving parameter is a carrier address generated by third and fourth groups of interleavers, results obtained by interleaving data in the first part are G1(I3) and G1(I4), and G1(I3) and G1(I4) are shifted according to the shift parameter during copying. Then, all parts during the second diversity are copied according to the carrier address generated by the third and fourth groups of interleavers. A mode of each-time diversity copying is similar to a mode of second diversity copying until copying is ended.

In step 5, the frame control data and the payload data are modulated respectively, specifically including the following steps.

In step 5a), the frame control data and the payload data are mapped respectively.

In the disclosure, different mapping modes are adopted for the frame control data and the payload data. For example, the frame control data can be mapped by using QPSK, a payload data modulation mode can be extended, and modes such as BPSK, QPSK and 16QAM are supported. Due to different modulation modes, the number of bits of the frame control data and the payload data on each carrier is different. For example, as for QPSK, the number of bits carried on each carrier is 2, and as for BPSK, the number of bits carried on each carrier is 1.

In step 5b), the mapped frame control data and payload data are scrambled, and modulated to a corresponding subcarrier.

After mapping is ended, the frame control data and payload data are scrambled, and a scrambling scheme is: adding a rotation factor to each subcarrier. In a preferred embodiment, a pseudo random, PN, sequence can be selected. A scrambled phase number is shown in Table 16. A scrambling method is:

where represents a constellation point of scrambled payload data, represents a constellation point of a non-scrambled payload data, and represents a rotation factor generated randomly, corresponding to a phase number in Table 8. Practically, if band 0 is adopted, phase numbers corresponding to carrier numbers 100 to 230 are taken, and if band 1 is adopted, phase numbers corresponding to carrier numbers 80 to 490 are taken.

The scrambled frame control data and payload data are placed on the corresponding subcarrier, and the value of a non-used subcarrier is set as 0.

After modulation is ended, frame control symbols and payload symbols are obtained. FIG. 13 shows a time domain waveform of a frame control sequence obtained by modulation. In the figure, a horizontal axis represents a time domain point number of a frame control signal, and a longitudinal axis represents a time domain amplitude of a frame control signal. FIG. 14 shows a self-correlation characteristic of a frame control signal. From this figure, it can be seen that a rotation phase added at this time can ensure that the frame control signal has a good self-correlation characteristic.

Table 16 Frame control and payload data mapping phase table

In step 6, IFFT is performed on the modulated frame control symbols and payload symbols respectively, and real parts are taken respectively for power control, so as to generate a time domain frame control symbol and a time domain payload symbol.

During power control, according to different modulation modes, power normalization factors are different. For example, if QPSK is adopted, the power normalization factor is , and if BPSK is adopted, the power normalization factor is 1.

In step 7, CPs are added to the time domain frame control symbol and the time domain payload symbol respectively, so as to generate complete OFDM frame control symbols and OFDM payload symbols.

When the CPs are added, the frame control symbol and the payload symbol have different CP lengths, a CP length of a frame control is 582 data points, CP lengths of first and second symbols of a payload are 582 data points, a CP length of other payloads is 388 data points, and a CP length of an OFDM symbol is the sum of a guard interval and a roll-off interval of the OFDM symbol, as shown in FIG. 17. When a CP is added, CP-length data symbols at the tail of the symbol are copied to the front end of the symbol.

After the CPs are added completely, the complete OFDM frame control symbols and OFDM payload symbols can be obtained.

In step 8, a frequency domain preamble symbol is generated in frequency domain according to a preamble phase table, and after IFFT is performed, a real part is taken for power control, so as to generate a time domain preamble signal.

The format of the preamble signal is shown in FIG. 10, and consists of 10.5 As and 2.5 -As, where a beginning 0.5 A of the 10.5As is a second half part of one A, and a last 0.5 -A of the 2.5 -As is a first half part of one -A. A serial sequence B is generated in the frequency domain, and a generation mode is:

where represents a preamble sequence generated in a frequency domain, k is a subcarrier symbol, represents a reference phase generated randomly, corresponding to a phase number in Table 9, and the reference phase is a selectable PN sequence. Practically, if band 0 is adopted, phase numbers corresponding to carrier numbers 100 to 230 are taken, and if band 1 is adopted, phase numbers corresponding to carrier numbers 80 to 490 are taken. FIG. 11 shows a time domain waveform of a modulated preamble symbol. In the figure, a horizontal axis represents a time domain point number of a preamble signal, and a longitudinal axis represents a time domain amplitude of a preamble signal. FIG. 12 shows a self-correlation characteristic of a preamble signal. From this figure, it can be seen that a preamble signal has a good self-correlation characteristic.

After a plurality of sequences B is generated in the frequency domain, N-point IFFT is performed to obtain corresponding time domain sequences A, the time domain sequences A are arranged according to a preamble format in FIG. 10, real parts are taken from the arranged sequences, and power control is performed, so that a preamble signal can be obtained. A phase reference table is shown in Table 17, and a real phase is a reference phase multiplied by π/8.

Table 17 Preamble phase table

In step 9, the time domain preamble signal, all the OFDM frame control symbols and all the OFDM payload symbols are windowed. A window function definition is shown in Table 18. As for a preamble, data in a front roll-off interval between a frame control and a payload is windowed up, and data in a rear roll-off interval is windowed down. As for preamble data, the whole preamble is windowed, the front part is not overlapped, and the rear part is overlapped with the front part of a first OFDM symbol of the frame control. As for frame control and payload data, each OFDM symbol is windowed, the rear part of the last OFDM symbol of the frame control and payload data is not overlapped, and the rear parts of other OFDM symbols will be overlapped with the front part of a next OFDM symbol.

Table 18 Window function definition

In step 10, an OFDM-based physical-layer-transmitting signal is generated and enters an analog front end.

The format of the OFDM-based physical-layer-transmitting signal is as shown in FIG. 4. The physical-layer-transmitting signal structurally consists of a preamble, a frame control and a data payload. As shown in FIG. 4, the length of the preamble is 13*1024, the lengths of both the frame control and the data payload are 1024, a rolloff interval of the preamble is 124, a roll-off interval of the frame control is also 124, a guard interval of the frame control is 458, guard intervals of a data payload 1 and a data payload 2 are 458, and the other payload intervals are 264, where a frame control signal has different numbers of symbols according to different bands. At band 0, namely within a range of 1.953 to 11.96MHz, the number of frame control symbols is 4. At band 1, namely within a range of 2.441 to 5.615MHz, the number of frame control symbols is 12.

Correspondingly, as shown in FIG. 2, a method for processing an OFDM-based PLC physical-layer-receiving signal includes the steps as follows. A data signal is received from an analog front end, and then the data signal is gained.

Clock/frame synchronization is performed on the gained data signal.

Fourier transform is performed on data subjected to clock/frame

synchronization.

Herein, the step that the data subjected to Fourier transform is demodulated includes the sub-steps as follows.

Turbo-decoded frame control data and payload data are output respectively.

Herein, after Turbo decoding is performed on the payload data, the method further includes: descrambling the turbo-decoded payload data.

The first processor is further configured to execute, by running the computer program, the following operations: performing Turbo coding on the frame control data and the payload data respectively; performing channel interleaving on the Turbo-coded frame control data and payload data respectively; and performing diversity copying on the channel-interleaved frame control data and payload data respectively.

The first processor is further configured to execute, by running the computer program, the following operation: scrambling the payload data.

The first processor is further configured to execute, by running the computer program, the following operation: coding the frame control data by using a first component coder and a second component coder respectively, where an input signal of the second component coder is subjected to Turbo interleaving first.

The first processor is further configured to execute, by running the computer program, the following operation: performing the Turbo interleaving in dual-bits, an interleaving length being equal to a number of dual-bits of an original data block length.

The first processor is further configured to execute, by running the computer program, the following operation: when performing channel interleaving on the Turbo-coded frame control data, interleaving information bits and check bits of the frame control data separately, when the information bits of the Turbo-coded frame control data are interleaved, the information bits are disorganized by reading different rows in a column-in row-out mode; and when the check bits are interleaved, the information bits are disorganized by reading different rows from an offset address in a column-in row-out mode.

The first processor is further configured to execute, by running the computer program, the following operation: after the information bits and check bits of the frame control data are interleaved separately, performing interleaving between the information bits and the check bits.

The first processor is further configured to execute, by running the computer program, the following operation: when performing diversity copying on the channel-interleaved frame control data, copying input bit data to a frequency domain subcarrier, and determining a copy count as demanded, so as to set an offset difference between an I path and a Q path.

The first processor is further configured to execute, by running the computer program, the following operation: when performing Turbo coding on the payload data, performing Turbo coding on the state of a register and a tail-biting matrix in the component coder are Turbo-coded to be correlated, the tail-biting matrix being determined by a size of a PB and a generating polynomial of the component coder.

The first processor is further configured to execute, by running the computer program, the following operation.

Data of the link layer contains a carrier mapping table, in which a coding rate, a modulation mode, a copying mode and adopted PB type information for the physical layer are specified; and the physical layer performs coding in a mode specified in indexes of the carrier mapping table.

When diversity copying is performed on the channel-interleaved payload data, a relationship between a copying count and the number of interleavers for copying is: when a diversity count is 2, the number of interleavers is 8, and the number of interleavers in each part is 4; when a diversity count is 4, the number of interleavers is 8, and the number of interleavers in each part is 2; when a diversity count is 5, the number of interleavers is 10, and the number of interleavers in each part is 2; when a diversity count is 7, the number of interleavers is 14, and the number of interleavers in each part is 2; and when a diversity count is 11, the number of interleavers is 11, and the number of interleavers in each part is 1.

The first processor is further configured to execute, by running the computer program, the following operation: dividing the payload data into multiple parts that are copied respectively, wherein each part has one or more interleavers, a result output by the interleaver serves as a mapping address of a subcarrier during copying of each part, and diiferent interleavers are selected for each copying at each time.

The first processor is further configured to execute, by running the computer program, the following operations.

The step that the channel-coded frame control data and payload data are modulated to a subcarrier includes the sub-steps as follows.

The first processor is further configured to execute, by running the computer program, the following operation: after IFFT is performed on the modulated frame control data and payload data, real parts of the frame control data and the payload data, subjected to IFFT, are taken respectively to perform power control.

The first processor is further configured to execute, by running the computer program, the following operation: adding phase rotation factors to the constellation-mapped frame control data and payload data, wherein a phase rotation reference value is generated pseudo-randomly, and a real phase is a reference phase multiplied by π/4, where a scrambling scheme is:

where represents a constellation point of a scrambled payload data, represents a carrier number, represents a constellation point of a non- scrambled payload data, and represents a rotation factor generated randomly.

The reference phase contains carrier 1 to carrier 511.

If band 0 is adopted, a band range is 1.953 to 11.96MHz, numbers of carriers begin from 80, and end with 490.

If band 1 is adopted, a band range is 2.441 to 5.615MHz, numbers of carriers begin from 100, and end with 230.

The first processor is further configured to execute, by running the computer program, the following operation: adding CPs to the frame control data and the payload data, so as to generate an OFDM symbol, OFDM symbols of the frame control data and the payload data have a time domain point number 1024, which is 40.96ps in time; a roll-off interval is 124 points, which is 4.96ps in time; a guard interval of the frame control data is 458 points, which is 18.32ps in time; a guard interval between a first symbol and a second symbol of the payload data is 458 points, which is 18.32ps in time; and a guard interval after a third symbol of the payload data is 264 points, which is 10.8ps in time.

The first processor is further configured to execute, by running the computer program, the following operation: generating the time domain preamble symbol by means of the following methods: generating a frequency domain preamble symbol in a frequency domain according to a preamble phase table; and performing IFFT on the frequency domain preamble symbol, and taking a real part to perform power control, so as to generate the time domain preamble symbol.

The first processor is further configured to execute, by running the computer program, the following operation: generating a preamble sequence in a frequency domain according to a preamble phase table by using a method:

where represents a preamble sequence generated in a frequency domain, is a subcarrier symbol, and represents a reference phase generated randomly.

The first processor is further configured to execute, by running the computer program, the following operation. The preamble has a data format of 10.5 As and 2.5 -As, where a beginning 0.5 A of the 10.5As is a second half part of one A, and a last 0.5 -A of the 2.5 -As is a first half part of one -A.

The first processor is further configured to execute, by running the computer program, the following operation. A time domain point number of the preamble is 1024, and time is 40.96 Fs .

The first processor is further configured to execute, by running the computer program, the following operation: correlating the number of frame control signals to an adopted band, wherein if band 0 is adopted, the number of frame control signals is 4; and if band 1 is adopted, the number of frame control signals is 12.

The second processor is further configured to execute, by running the computer program, the following operations: dividing the data subjected to Fourier transform into frame control data and payload data; performing diversity combination on the frame control data and the payload data respectively; performing channel deinterleaving on the diversity-combined frame control data and payload data respectively; performing Turbo decoding on the channel-deinterleaved frame control data and payload data respectively; and outputting Turbo-decoded frame control data and payload data respectively.

The second processor is further configured to execute, by running the computer program, the following operation: descrambling the turbo-decoded payload data.

When the executable program is operated by a processor, the processor executes the following operations: performing Turbo coding on the frame control data and the payload data respectively; performing channel interleaving on the Turbo-coded frame control data and payload data respectively; and performing diversity copying on the channel-interleaved frame control data and payload data respectively.

When the executable program is operated by a processor, the processor executes the following operation: scrambling the payload data.

When the executable program is operated by a processor, the processor executes the following operation: coding the frame control data by using a first component coder and a second component coder respectively, wherein an input signal of the second component coder is subjected to Turbo interleaving first.

When the executable program is operated by a processor, the processor executes the following operation: performing the Turbo interleaving in dual-bits, an interleaving length being equal to a number of dual-bits of an original data block length.

When the executable program is operated by a processor, the processor executes the following operation: when performing channel interleaving on the Turbo-coded frame control data, interleaving information bits and check bits of the frame control data separately, wherein when the information bits of the Turbo-coded frame control data are interleaved, the information bits are disorganized by reading different rows in a column-in row-out mode; and when the check bits are interleaved, the information bits are disorganized by reading different rows from an offset address in a column-in row-out mode.

When the executable program is operated by a processor, the processor executes the following operation: after interleaving the information bits and check bits of the frame control data separately, performing interleaving between the information bits and the check bits.

When the executable program is operated by a processor, the processor executes the following operation: when performing diversity copying on the channel-interleaved frame control data, copying input bit data to a frequency domain subcarrier, and determining a copy count as demanded, so as to set an offset difference between an I path and a Q path.

When the executable program is operated by a processor, the processor executes the following operation: when performing Turbo coding on the payload data, Turbo-coding a state of a register and a tail-biting matrix in the component coder to be correlated, the tail-biting matrix being determined by the size of a PB and a generating polynomial of the component coder.

When the executable program is operated by a processor, the processor executes the following operation.

When diversity copying is performed on the channel-interleaved payload data, a relationship between a copying count and the number of interleavers for copying is: when the diversity count is 2, the number of interleavers is 8, and the number of interleavers in each part is 4; when the diversity count is 4, the number of interleavers is 8, and the number of interleavers in each part is 2; when the diversity count is 5, the number of interleavers is 10, and the number of interleavers in each part is 2; when the diversity count is 7, the number of interleavers is 14, and the number of interleavers in each part is 2; and when the diversity count is 11, the number of interleavers is 11, and the number of interleavers in each part is 1.

When the executable program is operated by a processor, the processor executes the following operation: dividing the payload data into multiple parts that are copied respectively, wherein each part has one or more interleavers, a result output by the interleaver serves as a mapping address of a subcarrier during copying of each part, and different interleavers are selected for each copying.

When the executable program is operated by a processor, the processor executes the following operation: after performing IFFT on the modulated frame control data and payload data, taking real parts of the frame control data and the payload data, subjected to IFFT to perform power control.

When the executable program is operated by a processor, the processor executes the following operation: adding phase rotation factors to the constellation-mapped frame control data and payload data, wherein a phase rotation reference value is generated pseudo-randomly, and a real phase is a reference phase multiplied by π/4, where a scrambling scheme is:

The reference phase contains carrier 1 to carrier 511.

If band 0 is adopted, a band range of the band 0 is 1.953 to 11.96MHz, numbers of carriers begin from 80, and end with 490.

If band 1 is adopted, a band range of the band 1 is 2.441 to 5.615MHz, numbers of carriers begin from 100, and end with 230.

When the executable program is operated by a processor, the processor executes the following operation: adding CPs to the frame control data and the payload data, so as to generate an OFDM symbol, OFDM symbols of the frame control data and the payload data have a time domain point number 1024, which is 40.96ps in time; a roll-off interval is 124 points, which is 4.96ps in time; a guard interval of the frame control data is 458 points, which is 18.32ps in time; a guard interval between a first symbol and a second symbol of the payload data is 458 points, which is 18.32ps in time; and a guard interval after a third symbol of the payload data is 264 points, which is 10.8ps in time.

The time domain preamble symbol is generated by means of the following. A frequency domain preamble symbol is generated in a frequency domain according to a preamble phase table. IFFT is performed on the frequency domain preamble symbol, and a real part is taken to perform power control, so as to generate the time domain preamble symbol.

When the executable program is operated by a processor, the processor executes the following operation: generating a preamble sequence in a frequency domain according to a preamble phase table by using a method:

The first processor is further configured to execute, by running the computer program, the following operation: the preamble has a data format of 10.5 As and 2.5 -As, where a beginning 0.5 A of the 10.5As is a second half part of one A, and a last 0.5 -A of the 2.5 -As is a first half part of one -A.

The processor is further configured to execute, by running the computer program, the following operation: a time domain point number of the preamble is 1024, which is 40.96ps in time.

The number of frame control signals is correlated to an adopted band; if band 0 is adopted, the number of frame control signals is 4; and if band 1 is adopted, the number of frame control signals is 12.

The embodiment of the disclosure also provides a storage medium, which

stores an executable program, wherein when the executable program is operated by a processor, the processor executes the following operations: receiving a data signal from an analog front end, and then gaining the data signal; performing clock/frame synchronization on the gained data signal; performing Fourier transform on data subjected to clock/frame synchronization; and demodulating the data subjected to Fourier transform, so as to generate a frame control output and a payload output.

When the executable program is operated by a processor, the processor executes the following operations: dividing the data subjected to Fourier transform into frame control data and payload data; performing diversity combination on the frame control data and the payload data respectively; performing channel deinterleaving on the diversity-combined frame control data and payload data respectively; performing Turbo decoding on the channel-deinterleaved frame control data and payload data respectively; and outputting Turbo-decoded frame control data and payload data respectively.

When the executable program is operated by a processor, the processor executes the following operation: descrambling the turbo-decoded payload data.

If being implemented in a form of software function module and sold or used as an independent product, the above-mentioned information processing device according to the disclosure may also be stored in a computer-readable storage medium. Based on such understanding, the technical solutions of the embodiment of the disclosure substantially or parts making contributions to the conventional art may be embodied in form of software product, and the computer software product is stored in a storage medium, including a plurality of instructions used to enable computer equipment (which may be a personal computer, a server, network equipment or the like) to execute all or part of the method in each embodiment of the disclosure. The above-mentioned storage medium includes: various media capable of storing program codes such as a mobile hard disk, a Random Access Memory (RAM), a Read-Only Memory (ROM), a magnetic disk or an optical disk.

The above-mentioned embodiments are only preferable embodiments for fully illustrating the disclosure, and the scope of protection of the disclosure is not limited thereto. Equivalent replacements or transformations made by those skilled in the art on the basis of the disclosure fall within the scope of protection of the disclosure. The scope of protection of the disclosure refers to the claims.

INDUSTRIAL APPLICABILITY

In the embodiments of the disclosure, data from a link layer are received, and the data are divided into frame control data and payload data; channel coding is performed on the frame control data and the payload data respectively, and the channel-coded frame control data and payload data are modulated onto a subcarrier; IFFT is performed on the modulated frame control data and payload data, and power control is performed respectively, so as to generate a time domain frame control symbol and a time domain payload symbol; and CPs are added to the time domain frame control symbol and the time domain payload symbol, a time domain preamble symbol is added, and then windowing is performed, so as to generate a physical-layertransmitting signal. The method has a high band utilization rate, a high transmission rate, a strong inter-symbol interference resistance and a strong channel fading resistance.

Claims

1. A signal processing method, comprising: receiving data from a link layer, and dividing the data into frame control data and payload data; performing channel coding on the frame control data and the payload data respectively, and modulating the channel-coded frame control data and payload data to a subcarrier; performing Inverse Fast Fourier Transform, IFFT, on the modulated frame control data and payload data, and performing power control respectively, so as to generate a time domain frame control symbol and a time domain payload symbol; and adding Cyclic Prefixes, CP, and a time domain preamble symbol to the time domain frame control symbol and the time domain payload symbol, and then performing windowing, so as to generate a physical-layer-transmitting signal.

2. The method according to claim 1, wherein performing channel coding on the frame control data and the payload data comprises: performing Turbo coding on the frame control data and the payload data respectively; performing channel interleaving on the Turbo-coded frame control data and payload data respectively; and performing diversity copying on the channel-interleaved frame control data and payload data respectively.

3. The method according to claim 2, wherein before performing Turbo coding on the payload data, the method further comprises: scrambling the payload data.

4. The method according to claim 2, wherein performing Turbo coding on the frame control data comprises: coding the frame control data by using a first component coder and a second component coder respectively, an input signal of the second component coder being subjected to Turbo interleaving first.

5. The method according to claim 4, wherein the Turbo interleaving is performed in dual-bits, an interleaving length being equal to a number of dual-bits of an original data block length.

6. The method according to claim 2, wherein when channel interleaving is performed on the Turbo-coded frame control data, information bits and check bits of the frame control data are interleaved separately, wherein when the information bits of the Turbo-coded frame control data are interleaved, the information bits are disorganized by reading different rows in a column-in row-out mode, and when the check bits are interleaved, the information bits are disorganized by reading different rows from an offset address in a column-in row-out mode.

7. The method according to claim 6, wherein after the information bits and check bits of the frame control data are interleaved separately, interleaving is performed between the information bits and the check bits.

8. The method according to claim 2, wherein when diversity copying is performed on the channel-interleaved frame control data, input bit data is copied to a frequency domain subcarrier, and a copy count is determined as demanded, so as to set an offset difference between an I path and a Q path.

9. The method according to claim 2, wherein when Turbo coding is performed on the payload data, a state of a register and a tail-biting matrix in the component coder are Turbo-coded to be correlated, the tail-biting matrix being determined by a size of a Physical Block, PB, and a generating polynomial of the component coder.

10. The method according to claim 2, wherein data of the link layer contains a carrier mapping table, in which a coding rate, a modulation mode, a copying mode and adopted PB type information for the physical layer are specified; and the physical layer performs coding in a mode specified in indexes of the carrier mapping table.

11. Ihe method according to claim 2, wherein when diversity copying is performed on the channel-interleaved payload data, a relationship between a copying count and a number of interleavers for copying is: when a diversity count is 2, the number of interleavers is 8, and the number of interleavers in each part is 4; when the diversity count is 4, the number of interleavers is 8, and the number of interleavers in each part is 2; when the diversity count is 5, the number of interleavers is 10, and the number of interleavers in each part is 2; when the diversity count is 7, the number of interleavers is 14, and the number of interleavers in each part is 2; and when the diversity count is 11, the number of interleavers is 11, and the number of interleavers in each part is 1.

12. The method according to claim 11, wherein the payload data is divided into multiple parts that are copied respectively, each part has one or more interleavers, a result output by the interleaver serves as a mapping address of a subcarrier for copying of each part, and different interleavers are selected for each copying.

13. The method according to claim 1, wherein modulating the channel-coded frame control data and payload data to a subcarrier comprises: performing constellation mapping on the channel-coded frame control data and payload data respectively; and scrambling the mapped frame control data and payload data, and modulating the data to a corresponding subcarrier.

14. The method according to claim 13, wherein after IFFT is performed on the modulated frame control data and payload data, real parts of the frame control data and the payload data, subjected to IFFT are taken respectively to perform power control.

15. The method according to claim 13, wherein phase rotation factors are added to the constellation-mapped frame control data and payload data, a phase rotation reference value is generated pseudo-randomly, and a real phase is a reterence phase multiplied by π/4, where a scrambling scheme is: ^(k) = X(k)eJ^k) Q<k<N-1 where represents a constellation point of a scrambled payload data, represents a carrier number, represents a constellation point of a non- scrambled payload data, and represents a rotation factor generated randomly.

16. The method according to claim 15, wherein the reference phase contains carrier 1 to carrier 511.

17. The method according to claim 16, wherein when band 0 is adopted, a band range of the band 0 is 1.953 to 11.96MHz, numbers of carriers begin from 80, and end with 490;and when band 1 is adopted, a band range of the band 1 is 2.441 to 5.615MHz, numbers of carriers begin from 100, and end with 230.

18. The method according to claim 1, wherein CPs are added to the frame control data and the payload data, so as to generate an Orthogonal Frequency Division Multiplexing, OFDM, symbol, wherein OFDM symbols of the frame control data and the payload data have a time domain point number 1024, which is 40.96ps in time; a roll-off interval is 124 points, which is 4.96ps in time; a guard interval of the frame control data is 458 points, which is 18.32ps in time; a guard interval between a first symbol and a second symbol of the payload data is 458 points, which is 18.32ps in time; and a guard interval after a third symbol of the payload data is 264 points, which is 10.8ps in time.

19. The method according to claim 1, wherein the time domain preamble symbol is generated by means of the following: generating a frequency domain preamble symbol in frequency domain according to a preamble phase table; and performing 11·M on the trequency domain preamble symbol, and taking a real part to perform power control, so as to generate the time domain preamble symbol.

20. The method according to claim 18, wherein a preamble sequence is generated in frequency domain according to a preamble phase table by means of the following: X(k) = e 8 0 < k < N-1 where represents a preamble sequence generated in frequency domain, is a subcarrier symbol, and represents a reference phase generated randomly.

21. The method according to claim 18, wherein the preamble has a data format of 10.5 As and 2.5 -As, where a beginning 0.5 A of the 10.5As is a second half part of one A, and a last 0.5 -A of the 2.5 -As is a first half part of one -A.

22. The method according to claim 18, wherein a time domain point number of the preamble is 1024, which is 40.96 μ s in time.

23. The method according to claim 1, wherein a number of frame control signals is correlated to an adopted band; when band 0 is adopted, the number of frame control signals is 4; and when band 1 is adopted, the number of frame control signals is 12.

24. A signal processing method, comprising: receiving a data signal from an analog front end, and then gaining the data signal; performing clock/frame synchronization on the gained data signal; performing Fourier transform on data subjected to clock/frame synchronization; and demodulating the data subjected to Fourier transform, so as to generate a frame control output and a payload output.

25. The method according to claim 24, wherein demodulating the data subjected to Fourier transform comprises: dividing the data subjected to Fourier transform into frame control data and payload data; performing diversity combination on the frame control data and the payload data respectively; performing channel deinterleaving on the diversity-combined frame control data and payload data respectively; performing Turbo decoding on the channel-deinterleaved frame control data and payload data respectively; and outputting Turbo-decoded frame control data and payload data respectively.

26. The method according to claim 25, wherein after performing Turbo decoding on the payload data, the method further comprises: descrambling the turbo-decoded payload data.

27. A signal processing device, comprising: a first memory, configured to store an executable program; and a first processor, configured to execute the executable program stored in the first memory to implement the signal processing method according to claims 1 to 23.

28. A signal processing device, comprising: a second memory, configured to store an executable program; and a second processor, configured to execute the executable program stored in the second memory to implement the signal processing method according to claims 24 to 26.

29. A storage medium, storing an executable program, which, when being executed by a processor, implement the signal processing method according to claims 1 to 23.

30. A storage medium, storing an executable program, which, when being executed by a processor, implement a signal processing method according to claims 24 to 26.