CN115801054A - Turbo code sending method of frequency hopping system - Google Patents
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Abstract
The invention discloses a method for sending Turbo codes of a frequency hopping system, which relates to the technical field of anti-interference communication and comprises the following steps: firstly, turbo coding is carried out on an information sequence to generate a system sequence and a check sequence; respectively sending the system sequence and the check sequence into different interleavers to obtain the interleaved system sequence and the check sequence; then, carrying out data multiplexing on the interleaved system sequence and the check sequence to obtain a sending sequence; then the sending sequence is divided into blocks; finally, distributing the block data to each frequency hopping pulse, completing modulation, and sending according to a frequency hopping system frame structure; according to the invention, the correct receiving rate of the system communication frame can be improved under the interference of partial frequency band and time domain pulse, so that better anti-interference performance is obtained.
Description
Technical Field
The invention relates to the technical field of anti-interference communication, in particular to a Turbo code sending method of a frequency hopping system.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
The frequency hopping communication technology frequency continuously hops according to the frequency hopping pattern, so that the anti-interference, anti-interception and networking capabilities of the frequency hopping communication technology frequency are very outstanding; in view of the characteristic that the security and confidentiality requirements on transmission information in a communication system are high, the frequency hopping technology is widely applied to an anti-interference communication system; in the frequency hopping communication system, it is necessary to perform error control, particularly in the field of interference-free communication where security and effectiveness are highly regarded.
Forward Error Correction (FEC) is to detect and correct errors of information at a receiving end; the Turbo code is a high-performance forward error correction code, and can carry out communication at a transmission rate close to a theoretical value under a specific signal-to-noise ratio; turbo codes are widely used in 3G and 4G communication systems (e.g., UMTS and LTE) and in other applications such as deep space communication.
Error correction performance of the error correction code for burst errors of a channel is relatively poor, so an interleaving technology is usually used in error correction coding to randomize the burst errors; in a conventional frequency hopping communication system, channel interleaving is carried out on data subjected to Turbo error correction coding, and the data are dispersed on frequency hopping pulses with different frequencies through permutation and combination, namely, a channel is reformed into an approximate memoryless channel, so that the error correction capability of channel coding is fully exerted; however, for an actual frequency hopping system, partial frequency band interference and time domain pulse interference often exist, in order to improve the anti-interference performance of the frequency hopping system, a system bit and a check bit which are subjected to Turbo coding need to be randomly and averagely allocated to each frequency hopping pulse, so that the coding system bit and the check bit which are reserved on an undisturbed frequency hopping pulse under the partial frequency band interference and the time domain pulse interference are balanced as much as possible, and the maximum error correction anti-interference capability is obtained.
FIGS. 2a and 2b are schematic diagrams of frequency hopping communication systems showing partial band interference and time domain impulse interference; wherein, FIG. 2a shows partial band interference, and the frequency hopping point set is { F } 1 F 2 ... F N One or more interference signals exist in a frequency hopping communication frequency band, the power of the interference signals is far greater than that of the signals in the interference frequency band, and a frequency hopping system can only recover information source information through the undisturbed frequency hopping signals; fig. 2b shows time domain pulse interference, in one frequency hopping transmission, the number of frequency hopping pulses is N, wherein, part of pulse signals are subjected to pulse interference, and in the interference time, the power of the interference signal is much greater than the power of the signal, and the frequency hopping system can only recover the information source information through the undisturbed frequency hopping signal.
Disclosure of Invention
The invention aims to: for an actual frequency hopping system, under the interference of a partial frequency band and the interference of a time domain pulse, because the power of an interference signal is far greater than the power of a signal, the frequency hopping system can only recover information source information through an undisturbed frequency hopping signal, and the interference resistance is general.
The technical scheme of the invention is as follows:
a method for sending Turbo codes of a frequency hopping system specifically comprises the following steps:
step S1: for information sequence { x k Carry on Turbo coding, produce the systematic sequence { x k Y, check sequence i,k } and check sequence z i,k }；
Step S2: will system sequence { x k Y, check sequence i,k Z and check sequence z i,k Sending the data into different interleavers respectively to obtain interleaved systematic sequence { x' k }, check sequence { y' i,k } and check sequence { z' i,k }；
And step S3: sequence of System { x' k }, check sequence { y' i,k } and check sequence { z' i,k Multiplexing data to obtain a sending sequence;
and step S4: the method comprises the steps of partitioning a sending sequence into blocks, namely a block 1 and a block 2, wherein the block 2 is 8230, the block 8230is N, and the bit number of each block corresponds to the bit number sent by one frequency modulation pulse;
step S5: and distributing the block data to each frequency hopping pulse to complete modulation, and sending the block data according to the frame structure of the frequency hopping system.
Further, the step S1 includes:
information sequence of length K x k Sending the check sequence to N component encoders for encoding, and outputting N groups of check sequences as y i,k }; it should be noted that, among them: x is the number of k E.g. 0,1, K is more than or equal to 0 and less than or equal to K-1, i is more than or equal to 0 and less than or equal to N-1, N is the number of component encoders in the encoder;
{x k outputting the system sequence simultaneously;
at the same time, { x k Sending the sequence after passing through the interleaver into N component encoders for encoding, and outputting N groups of check sequences as { z } i,k }; it should be noted that, among them: z is a radical of i,k ∈{0,1}，1≤i≤N，0≤k≤K-1；
{x k }，{y i,k }，{z i,k All are sequences of length K, totaling group 2N + 1.
Further, the step S2 includes:
will system sequence { x k }, check sequence { y i,k Z and check sequence z i,k Transmitting the combined sequence of 2N +1 into 2N +1 interleavers respectively, resetting the positions of elements in the sequence, wherein the depth of each interleaver is K, and the interleaved sequence is a system sequence { x' k } check sequence { y' i,k } and check sequence { z' i,k }。
Further, the step S3 includes:
interleaved systematic sequence { x' k } check sequence { y' i,k } and check sequence { z' i,k Sequentially inputting a matrix with dimension (2N + 1) multiplied by K, and realizing data multiplexing by adopting a row writing and column reading mode; i.e., { x' k } input line 1, { y' 1,k } input line 2, { y' 2,k } input line 3 \8230' N,k Inputting the N +1 th line; { z' 1,k } input line N +2, { z' 2,k } input line N +3 rows of 8230z' N,k Inputting the 2N +1 line; when the matrix is read out, the matrix elements are read out sequentially by column to obtain a transmission sequence x' 0 ,y′ 1,0 ,y′ 2,0 …y′ N,0 ,z′ 1,0 ,z′ 2,0 …z′ N,0 ,x′ 1 ,y′ 1,1 ,y′ 2,1 …y′ N,1 ,z′ 1,1 ,z′ 2,1 …z′ N,1 ,…,x′ K-1 ,y′ 1,K-1 ,y′ 2,K-1 …y′ N,K-1 ,z′ 1,K-1 ,z′ 2,K-1 …z′ N,K-1 And the total length of the transmission sequence is (2N + 1) multiplied by K.
Further, the step S4 includes:
in the frequency hopping system, the coded bit number carried by each frequency hopping pulse is P, the frequency hopping pulse number of one frequency hopping frame is M, and the total bit number sent by one frequency hopping frame is PM;
in the design of the frequency hopping system, the length of the transmission sequence output in step S3 is equal to the total number of bits transmitted by one frequency hopping frame, i.e., (2n + 1) × K = PM;
the transmission sequence output in step S3 is divided into a group of blocks 1 and 2.
Further, in step S4:
when the length of the transmission sequence output in step S3 is smaller than the total number of bits transmitted by one hop frame, i.e., (2n + 1) × K ≦ PM, Q fixed bits are added after (2n + 1) × K bits of the transmission sequence, or the first Q bits of the transmission sequence are added, so that (2n + 1) × K + Q = PM, and then the PM bit data are divided into a group of blocks 1 and 2.
Further, the step S4 includes:
distributing the data bits of the blocks to corresponding frequency hopping pulses, namely distributing the data bits of the blocks to the frequency hopping pulses 1, distributing the data bits of the blocks to the frequency hopping pulses 2 \823030, and distributing the data bits of the blocks to the frequency hopping pulses M;
and completing modulation of each hop of bit information, controlling a frequency synthesizer according to a frequency pattern of the hopping pulse, adding signals such as a synchronization segment and a frequency switching segment, and sending out a hopping signal.
Compared with the prior art, the invention has the beneficial effects that:
a method for transmitting Turbo codes of a frequency hopping system comprises the following steps: performing Turbo coding on the information sequence to generate a system sequence and a check sequence; respectively sending the system sequence and the check sequence into different interleavers to obtain the interleaved system sequence and the check sequence; then, carrying out data multiplexing on the interleaved system sequence and the check sequence to obtain a sending sequence; partitioning the sending sequence; finally, distributing the block data to each frequency hopping pulse, completing modulation, and sending according to a frequency hopping system frame structure; the method can improve the correct receiving rate of the system communication frame under the interference of partial frequency bands and time domain pulses, thereby obtaining better anti-interference performance.
Drawings
FIG. 1 is a flow chart of a method for transmitting Turbo codes for a frequency hopping system;
FIG. 2a is a schematic diagram of a partial band interference;
FIG. 2b is a schematic diagram of a portion of a time domain pulse interference;
FIG. 3 is a diagram of an example of transmitting a 1/3 code rate Turbo code in a frequency hopping system.
Detailed Description
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The features and properties of the present invention are described in further detail below with reference to examples.
Example one
Error correction performance of the error correction code for burst errors of a channel is poor, so an interleaving technology is usually used in error correction coding to randomize the burst errors; in a conventional frequency hopping communication system, channel interleaving is carried out on data subjected to Turbo error correction coding, and the data are dispersed on frequency hopping pulses with different frequencies through permutation and combination, namely, a channel is reformed into an approximate memoryless channel, so that the error correction capability of channel coding is fully exerted; however, for an actual frequency hopping system, there often exists partial frequency band interference and time domain pulse interference, in order to improve the anti-interference performance of the frequency hopping system, it is necessary to randomly and evenly allocate system bits and check bits after Turbo coding to each frequency hopping pulse, so as to ensure that the reserved coding system bits and check bits are balanced as much as possible on the undisturbed frequency hopping pulse under the partial frequency band interference and the time domain pulse interference, so as to obtain the maximum anti-interference capability.
FIGS. 2a and 2b are schematic diagrams of frequency hopping communication systems showing partial band interference and time domain impulse interference; wherein, FIG. 2a shows partial band interference, and the frequency hopping point set is { F } 1 F 2 ... F N One or more interference signals exist in a frequency hopping communication frequency band, the power of the interference signals is far greater than that of the signals in the interference frequency band, and a frequency hopping system can only recover information source information through the undisturbed frequency hopping signals; fig. 2b shows time domain pulse interference, in one frequency hopping transmission, the number of frequency hopping pulses is N, wherein, part of pulse signals are subjected to pulse interference, and in the interference time, the power of interference signals is much greater than the power of signals, and the frequency hopping system can only recover information source information through the undisturbed frequency hopping signals.
In view of the above problems, the present embodiment provides a method for sending a Turbo code of a frequency hopping system, which can improve the correct receiving rate of a system communication frame under partial frequency band interference and time domain pulse interference, so as to obtain better anti-interference performance.
Referring to fig. 1, a method for transmitting a Turbo code in a frequency hopping system specifically includes the following steps:
step S1: for information sequence { x k Carry on Turbo coding, produce the systematic sequence { x k Y, check sequence i,k Z and check sequence z i,k }；
Step S2: will systematic sequence { x k Y, check sequence i,k Z and check sequence z i,k Sending the data into different interleavers respectively to obtain interleaved systematic sequence { x' k } check sequence { y' i,k } and check sequence { z' i,k }；
And step S3: sequence of System { x' k }, check sequence { y' i,k The sum check sequence{z′ i,k Multiplexing data to obtain a sending sequence;
and step S4: the method comprises the steps of partitioning a sending sequence into blocks, namely a block 1 and a block 2, wherein the block 2 is 8230, the block 8230is N, and the bit number of each block corresponds to the bit number sent by one frequency modulation pulse;
step S5: and distributing the block data to each frequency hopping pulse to complete modulation, and sending the block data according to the frame structure of the frequency hopping system.
In this embodiment, specifically, the step S1 includes:
information sequence of length K x k Sending the check sequence to N component encoders for encoding, and outputting N groups of check sequences as y i,k }; it should be noted that, among them: x is a radical of a fluorine atom k Belongs to {0,1}, K is more than or equal to 0 and less than or equal to K-1, i is more than or equal to 0 and less than or equal to N-1, and N is the number of component encoders in the encoder;
{x k outputting the system sequence simultaneously;
at the same time, { x k Sending the sequence after passing through the interleaver into N component encoders for encoding, and outputting N groups of check sequences as { z } i,k }; it should be noted that, among them: z is a radical of formula i,k ∈{0,1}，1≤i≤N，0≤k≤K-1；
{x k }，{y i,k }，{z i,k All are sequences of length K, totaling group 2N + 1.
In this embodiment, specifically, the step S2 includes:
will systematic sequence { x k Y, check sequence i,k } and check sequence z i,k Transmitting the combined sequence of 2N +1 into 2N +1 interleavers respectively, resetting the positions of elements in the sequence, wherein the depth of each interleaver is K, and the interleaved sequence is a system sequence { x' k }, check sequence { y' i,k } and check sequence { z' i,k }。
In this embodiment, specifically, the step S3 includes:
interleaved systematic sequence { x' k } check sequence { y' i,k } and check sequence { z' i,k Sequentially inputting a matrix with dimension (2N + 1) multiplied by K, and realizing data multiplexing in a row writing and column reading mode; i.e. at the input momentTime of battle, { x' k } input line 1, { y' 1,k } input line 2, { y' 2,k } input line 3 8230of y' N,k The (N + 1) th row is input; { z' 1,k } input line N +2, { z' 2,k } input line N +3 \ 8230; { z' N,k Inputting the 2N +1 line; when reading out the matrix, the matrix elements are read out in sequence by column to obtain a transmission sequence x' 0 ,y′ 1,0 ,y′ 2,0 …y′ N,0 ,z′ 1,0 ,z′ 2,0 …z′ N,0 ,x′ 1 ,y′ 1,1 ,y′ 2,1 …y′ N,1 ,z′ 1,1 ,z′ 2,1 …z′ N,1 ,…,x′ K-1 ,y′ 1,K-1 ,y′ 2,K-1 …y′ N,K-1 ,z′ 1,K-1 ,z′ 2,K-1 …z′ N,K-1 And the total length of the transmission sequence is (2N + 1) XK.
In this embodiment, specifically, the step S4 includes:
in the frequency hopping system, the coded bit number carried by each frequency hopping pulse is P, the frequency hopping pulse number of one frequency hopping frame is M, and the total bit number sent by one frequency hopping frame is PM;
in the design of the frequency hopping system, the length of the transmission sequence output in step S3 is equal to the total number of bits transmitted in one frequency hopping frame, i.e., (2n + 1) × K = PM;
the transmission sequence output in step S3 is divided into a group of blocks 1 and 2.
In this embodiment, specifically, in step S4:
when the length of the transmission sequence output in step S3 is smaller than the total number of bits transmitted by one hop frame, i.e., (2n + 1) × K ≦ PM, Q fixed bits are added after (2n + 1) × K bits of the transmission sequence, or the first Q bits of the transmission sequence are added, so that (2n + 1) × K + Q = PM, and then the PM bit data are divided into a group of blocks 1 and 2.
In this embodiment, specifically, the step S4 includes:
distributing the data bits of the blocks to corresponding frequency hopping pulses, namely distributing the data bits of the blocks to the frequency hopping pulse 1, distributing the data bits of the blocks to the frequency hopping pulse 2 \82303030fromthe block 1 and distributing the data bits of the blocks to the frequency hopping pulse M;
and completing modulation by the information of each hop bit, controlling a frequency synthesizer according to the frequency pattern of the hopping pulse, adding signals such as a synchronous segment, a frequency conversion segment and the like, and sending out a hopping signal.
Example two
Referring to fig. 3, the second embodiment is an example of Turbo coding interleaving for a frequency hopping system when a code rate is 1/3 in the method for transmitting Turbo codes of the frequency hopping system provided in the first embodiment.
The length of the information sequence K =512, and the turbo code rate is 1/3.
Information sequence x k Sending the data to a component encoder 1 for encoding, and outputting a check sequence of y k }，y k ∈{0,1}，1≤i≤N，0≤k≤K-1，{x k And simultaneously outputting the system sequence.
At the same time, { x k Sending the sequence after passing through the interleaver A into the component encoder 2 for encoding, and outputting a check sequence of { z } k }，z k ∈{0,1}，1≤i≤N，0≤k≤K-1。
{x k }，{y k }，{z k All the sequences with the length K =512, and the total number is 3.
Will systematic sequence { x k Y and the check sequence y k }，{z k And (5) 3 groups of sequences are respectively fed into 3 different interleavers, and each interleaver has the depth of K =512, wherein x k Sent to interleaver B1, { y } k Is sent to an interleaver B2, { z } k Sending the sequence into an interleaver B3, resetting the positions of elements in the sequence, wherein the interleaved sequence is a system sequence { x' k }, check sequence { y' k }，{z′ k }。
Sequence { x' k }，{y′ k And { z' k Sequentially inputting a matrix with the dimensionality of 3 multiplied by 512; wherein, { x' k } input matrix line 1, { y' k } input matrix line 2, { z' k The input matrix row 3.
When reading out the matrix, the matrix elements are read out in sequence by column to obtain a transmission sequence x' 0 ,y′ 0 ,z′ 0 ,x′ 1 ,y′ 1 ,z′ 1 ,x′ 2 ,y′ 2 ,z′ 2 ,…,x′ 511 ,y′ 511 ,z′ 511 The total sequence length is 3 × 512=1536;
in a frequency hopping system, each group of hopping frames is designed to be 32 hops, each hop carrying 48 bits.
Partitioning the transmission sequence into blocks of 48 bits each, then x' 0 ,y′ 0 ,z′ 0 ,x′ 1 ,y′ 1 ,z′ 1 ,…,x′ 15 ,y′ 15 ,z′ 15 Total 48 bits are block 1,x' 16 ,y′ 16 ,z′ 16 ,x′ 17 ,y′ 17 ,z′ 17 ,…,x′ 31 ,y′ 31 ,z′ 31 48 bits in total are block 2, \8230;, x' 496 ,y′ 496 ,z′ 496 ,x′ 497 ,y′ 497 ,z′ 497 ,…,x′ 511 ,y′ 511 ,z′ 511 A total of 48 bits as a block 32;
the data bits of the block are allocated to the corresponding hopping pulses, i.e., block 1 to hopping pulse 1, block 2 to hopping pulse 2 \8230, and block 32 to hopping pulse 32.
BPSK modulation is carried out on the bit information of each hop, a frequency synthesizer is controlled according to the frequency pattern of the hopping pulse, signals such as a synchronization segment and a frequency conversion segment are added, and the hopping signal is sent out.
The above-mentioned embodiments only express the specific embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for those skilled in the art, without departing from the technical idea of the present application, several changes and modifications can be made, which are all within the protection scope of the present application.
The background section is provided to present the context of the invention in general, and work of the presently named inventors, to the extent it is described in this background section, as well as aspects of the description that may not otherwise qualify as prior art at the time of filing, are neither expressly nor impliedly admitted as prior art against the present invention.
Claims (7)
1. A method for transmitting Turbo codes in a frequency hopping system is characterized by comprising the following steps:
step S1: for information sequence { x k Carry on Turbo coding, produce the systematic sequence { x k Y, check sequence i,k Z and check sequence z i,k }；
Step S2: will system sequence { x k }, check sequence { y i,k Z and check sequence z i,k Sending the data to different interleavers respectively to obtain interleaved system sequences { x' k }, check sequence { y' i,k } and check sequence { z' i,k }；
And step S3: sequence of System { x' k } check sequence { y' i,k } and check sequence { z' i,k Multiplexing data to obtain a sending sequence;
and step S4: the method comprises the steps of partitioning a sending sequence into blocks, namely a block 1 and a block 2, wherein the block 2 is 8230, the block 8230is N, and the bit number of each block corresponds to the bit number sent by one frequency modulation pulse;
step S5: and distributing the block data to each frequency hopping pulse to complete modulation, and sending the block data according to the frame structure of the frequency hopping system.
2. The method for transmitting Turbo code in frequency hopping system according to claim 1, wherein the step S1 includes:
information sequence of length K { x k Sending the check sequence to N component encoders for encoding, and outputting N groups of check sequences as y i,k }；
{x k Outputting the system sequence simultaneously;
at the same time, { x k Sending the sequence after passing through the interleaver into N component encoders for encoding, and outputting N groups of check sequences as { z } i,k }；
{x k }，{y i,k }，{z i,k All are sequences of length K, for a total of 2N +1 groups.
3. The method for transmitting Turbo code in frequency hopping system according to claim 2, wherein said step S2 comprises:
will systematic sequence { x k Y, check sequence i,k Z and check sequence z i,k Transmitting the combined sequence of 2N +1 into 2N +1 interleavers respectively, resetting the positions of elements in the sequence, wherein the depth of each interleaver is K, and the interleaved sequence is a system sequence { x' k }, check sequence { y' i,k } and check sequence { z' i,k }。
4. The method for transmitting Turbo code in frequency hopping system according to claim 2, wherein said step S3 comprises:
interleaved systematic sequence { x' k }, check sequence { y' i,k } and check sequence { z' i,k And sequentially inputting a matrix with dimension (2N + 1) multiplied by K, and realizing data multiplexing by adopting a row writing and column reading mode.
5. The method for transmitting Turbo code in frequency hopping system according to claim 4, wherein said step S4 comprises:
in the frequency hopping system, the coded bit number carried by each frequency hopping pulse is P, the frequency hopping pulse number of one frequency hopping frame is M, and the total bit number sent by one frequency hopping frame is PM;
in the design of the frequency hopping system, the length of the transmission sequence output in step S3 is equal to the total number of bits transmitted by one frequency hopping frame, i.e., (2n + 1) × K = PM;
the transmission sequence output in step S3 is divided into a group of blocks 1 and 2.
6. The method for transmitting Turbo code in frequency hopping system according to claim 5, wherein in said step S4:
when the length of the transmission sequence output in step S3 is smaller than the total number of bits transmitted by one hop frame, i.e., (2n + 1) × K ≦ PM, Q fixed bits are added after (2n + 1) × K bits of the transmission sequence, or the first Q bits of the transmission sequence are added, so that (2n + 1) × K + Q = PM, and then the PM bit data are divided into a group of blocks 1 and 2.
7. The method for transmitting Turbo code in frequency hopping system according to claim 6, wherein said step S4 comprises:
distributing the data bits of the blocks to corresponding frequency hopping pulses, namely distributing the data bits of the blocks to the frequency hopping pulse 1, distributing the data bits of the blocks to the frequency hopping pulse 2 \82303030fromthe block 1 and distributing the data bits of the blocks to the frequency hopping pulse M;
and completing modulation of each hop of bit information, controlling a frequency synthesizer according to the frequency pattern of the hopping pulse, adding a synchronization segment signal and a frequency band switching signal, and sending out a hopping signal.
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