CN103812613B - A kind of parity check code spreads the iterative detection device of continuous phase modulation system - Google Patents
A kind of parity check code spreads the iterative detection device of continuous phase modulation system Download PDFInfo
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Abstract
The invention belongs to signal detection field, and in particular to a kind of low density parity check code of the low density parity check code continuous phase modulation system based on spread spectrum spreads the iterative detection device of continuous phase modulation system.A kind of parity check code spreads the iterative detection device of continuous phase modulation system, including reception antenna, CPM demodulators, CPM soft-output codings module, despreading mapper, solution random interleaver, weighting processing module, LDPC code soft-output coding module, random interleaver, spread spectrum mapper, auxiliary hard decision module, on-off circuit and bit decision device.Be incorporated into spread spectrum in LDPC CPM systems by the present invention, can further improve the reliability and antijamming capability of the system；Effectively improve the performance of the system based on spread spectrum；Introducing auxiliary hard decision module can be such that iterative process stops in time under less iterations, reduce mean iterative number of time, improve the real-time of system.
Description
Technical field
The invention belongs to signal detection field, and in particular to a kind of low-density checksum based on spread spectrum（Low
Density Parity Check Code,LDPC）Code Continuous Phase Modulation（Continuous Phase Modulation,
CPM）The low density parity check code of system spreads the iterative detection device of continuous phase modulation system.
Background technology
Reliability and validity are two principal elements that communication system must take into consideration, and wireless communication system must take into consideration frequency
Spectrum efficiency and power efficiency, being combined using advanced coding techniques and efficient modulation technique can make power utilization and frequency
Spectrum utilization rate reaches preferable equalization point.Traditional communication code and the conventional method of the separate design of modulation have fatal
Defect：I.e. with increase redundancy as main design idea channel coding with error-correcting performance raising, redundancy increases considerably,
Reduce effective information transmission rate.
Irregular low-density checksum（Low-Density Parity-Check,LDPC）Code is found so far
Closest to the channel coding of Shannon limits, better than optimal Turbo code, performance limits only poor 0.0045dB away from Shannon.Non- rule
The then LDPC of quasi- cyclic（QC-LDPC）Code, its check matrix has quasi- circulation and lower triangular structure simultaneously, overcomes random
LDPC code complexity shortcoming high.Continuous Phase Modulation（Continuous Phase Modulation,CPM）It is a class envelope
Constant modulation technique, with efficient frequency band and power utilization, is particularly suitable for needing to use nonlinear power amplifier
Satellite communication system, it is considered to be the main candidate modulation scheme of Future Multimedia satellite communication.LDPC-CPM combined codings
Modulation system can make system that an optimal binding site is reached between the availability of frequency spectrum and power utilization.
The decoding concept of Turbo is rapidly developed in wireless communication field in recent years, the real breakthrough discoveries of Turbo
It is not its coding form, but based on soft-output coding SISO（Soft Input Soft Output）Component code decoding is calculated
The iterative decoding methodology of method.With developing rapidly for telecommunications, the foundation of various types of communication net so that limited frequency resource is more
Plus it is crowded, interference each other is even more serious, and spread spectrum communication system has very strong interference free performance, its multiple access energy
The also extremely concern of people of the functions such as power, secrecy, anti-multipath, is widely used in military communication and commercial communication.If expanding
Using the thought of Turbo iterative detections in display system, then the reliability and interference free performance of system can be obviously improved.
《Electronic letters, vol》Deliver《A kind of Turbo cdma systems of application CPM band spectrum modulations》In, avoided in the system
The shortcoming of individually designed loss information content is demodulated, decoded in conventional receiver designs, and the system can further improve system
Reliability, but how to realize that aspect do not have explanation in detail to despread-and-demodulation device mechanism, and the real-time of system is poor.
《Shenzhen University's journal》Deliver《Based on the design of Turbo iterative algorithm LDPCC-CPM system receivers》One text proposes use
CPM demodulators and LDPC decodings use Joint iteration detection technique, CPM demodulators and ldpc decoder is constituted a soft input
Soft output module, can effectively improve the reliability of system, but the research of this kind of system not in terms of interference free performance.If
LDPC-CPM systems are applied in spread spectrum communication system, and are so existed using the thought of Turbo iterative detections in systems
While significantly lifting reliability and anti-interference, there can be the preferable availability of frequency spectrum.
The present invention in spread spectrum system, will demodulate LDPC codings and CPM modulated applications using Turbo iterator mechanisms, solution
Expand and decoding is organically combined, and mean iterative number of time is reduced using dynamic stopping criterion in system, improve the reality of system
Shi Xing.
The content of the invention
Present invention proposition is a kind of can to improve the reliability and antijamming capability of system, and can reduce Average Iteration
A kind of number, the parity check code for improving the real-time of system spreads the iterative detection device of continuous phase modulation system.
The purpose of the present invention is achieved through the following technical solutions：
A kind of parity check code spreads the iterative detection device of continuous phase modulation system, including reception antenna, CPM demodulation
Device, CPM soft-output codings module, despreading mapper, solution random interleaver, weighting processing module, LDPC code soft inputting and soft are defeated
Go out module, random interleaver, spread spectrum mapper, auxiliary hard decision module, on-off circuit and bit decision device, reception antenna is received
By Gaussian channel pollute CPM modulated signals, be passed to CPM demodulators and be demodulated, CPM demodulators output inner code word by
Bit priori probability information sequence delivers to CPM soft-output codings module and as an input, CPM soft-output coding modules
LDPC code soft-output coding module is exported outer code word simultaneously is by the weighted processing module of bit probability information sequence, random
Interleaver and spread spectrum mapper after as another input, CPM soft-output codings module output update after interior information word by
Bit probability information sequence, interior information word by bit probability information sequence sequentially through despreading mapper, solution random interleaver and
LDPC code soft-output coding module is delivered to by bit priori probability information sequence as outer code word after weighting processing module,
The external information word of LDPC code soft-output coding module output delivers to auxiliary hard decision module, auxiliary by bit probability information sequence
Hard decision module since second iteration, to the adjacent China and foreign countries of iteration twice information word by the hard of bit rate probabilistic information sequence
Judgement is compared, if hard decision of the n-th with (n-1)th time is consistent, stops iterative detection overall process and trigger switch electricity
Road, while the external information word of nth iteration is delivered into bit decision device by bit probability information sequence and being carried out hard decision and being exported.
The beneficial effects of the present invention are：
1. spread spectrum is incorporated into LDPC-CPM systems, can further improve the reliability of the system and anti-interference
Ability；
2. introducing spread spectrum/despreading mapper can set up the iterative detection mechanism exchanged based on external information, effectively improve and be based on
The performance of the LDPC-CPM systems of spread spectrum；
3. introducing auxiliary hard decision module can be such that iterative process stops in time under less iterations, reduce average
Iterations, improves the real-time of system.
Brief description of the drawings
Fig. 1 is and the transmitter principle figure corresponding to the present invention；
Fig. 2 is to spread iterative detection mechanism block diagram with the LDPC-CPM corresponding to the present invention；
Fig. 3 is have spread spectrum and the LDPC-CPM iteration systems BER without spread spectrum to compare, and iterations is the 8th time.
Specific embodiment
The invention will be further described with example below in conjunction with the accompanying drawings：
The emitter corresponding with the present invention is by LDPC encoder（1）, random interleaver（2）, DSSS（3）、
CPM modulators（4）, transmitting antenna（7）Composition, as shown in Figure 1.Information sequence is through LDPC encoder（1）, random interleaver
（2）, DSSS（3）After be input to CPM modulators（4）, wherein, CPM modulators（4）It is decomposed into continuous phase encoder
（Continuous Phase Encoder,CPE）（5）With memoryless modulator MM（Memoryless Modulator,MM）
（6）.CPE（5）Input information is carried out after continuous phase coding as MM（6）Input, MM（6）Selection one suitable waveform by
Antenna（7）Send to Gaussian channel.The principal character of the emitter is as follows：
1.LDPC encoders（1）Using QC-LDPC（Quasi-cyclic LDPC）Code, its check matrix uses lower triangle
Structure, coding uses iteration encryption algorithm；
2. random interleaver（2）Using pseudo random interleaving pattern；
3. DSSS（3）It is middle to use spread spectrum code word size for walsh yards of 16.
4.CPM modulators（4）Using binary system, modulation index h is 1/2, and base band pulse shape g (t) uses rectangular pulse
Shaping function（REC）, its memory span L is 1 code-element period, and now CPM is MSK（MSK）.
The present invention is by reception antenna（8）, CPM demodulators（9）, CPM soft-output coding modules（CPM-SISO）（10）, solution
Expanding map device（11）, solution random interleaver（12）, weighting processing module（13）, LDPC code soft-output coding module（LDPC-
SISO）（14）, random interleaver（2）, spread spectrum mapper（15）, auxiliary hard decision module（16）, on-off circuit（17）And bit
Decision device（18）Composition, as shown in Figure 2.
Reception antenna（8）The CPM modulated signals by Gaussian channel pollution are received, and is passed to CPM demodulators（9）Carry out
Demodulation, demodulator（9）Export inner code word delivers to CPM-SISO modules by bit priori probability information sequence（10）And as it
In one input, module（10）Simultaneously by LDPC-SISO modules（14）The outer code word of output is passed through by bit probability information sequence
Weighting processing module（13）, random interleaver（2）With spread spectrum mapper（15）Afterwards as its another input, module（10）Output
, by bit probability information sequence, the sequence is by despreading mapper for interior information word after renewal（11）, solution random interleaver（12）
With weighting processing module（13）Afterwards LDPC-SISO modules are delivered to as outer code word by bit priori probability information sequence（14）,
The external information word of module output delivers to auxiliary hard decision module by bit probability information sequence（16）, the module from second repeatedly
In generation, starts, and the hard decision by bit rate probabilistic information sequence to the adjacent China and foreign countries of iteration twice information word is compared, if n-th
The secondary hard decision with (n-1)th time is consistent, then stop iterative detection overall process and trigger switch circuit（17）, while by this iteration
External information word deliver to bit decision device by bit probability information sequence（18）Carry out hard decision and export.
The principal character of the detection means is as follows：
1.CPM-SISO modules（10）Information word is delivered to despreading and is reflected first by bit probability information sequence in the spread spectrum of output
Emitter（11）, de-spread mapper（11）Information word passes through solution random interleaver by bit probability information sequence in the despreading of output
（12）With weighting processing module（13）Deliver to LDPC-SISO modules（14）, as the outer code word of input by bit probability information sequence
Row.LDPC-SISO modules（14）The outer code word of output is weighted processing module by bit probability information sequence（13）, random hand over
Knit device（2）With spread spectrum mapper（15）Deliver to CPM-SISO modules（10）, as the interior information word of input by bit probability information
Sequence.
2. since second iterative detection, LDPC-SISO modules（14）The external information word of output is by bit probability information
Sequence delivers to auxiliary hard decision module（16）, the module is to the adjacent China and foreign countries of iteration twice information word by bit rate probabilistic information sequence
The hard decision of row is compared, if hard decision of the n-th with (n-1)th time is consistent, stops iterative detection overall process and carries out
Hard decision decoding；If hard decision of the n-th with (n-1)th time is inconsistent, next iteration detection is carried out.
Fig. 1 is the transmitter principle figure corresponding with the present invention, by CPM modulators（4）By continuous phase encoder（5）With
Memoryless modulator（6）Composition.Each symbol in Fig. 1 is defined as follows：
Uo：Information sequence to be sent；
Co：The codeword sequence of the output of LDPC encoder 1；
Ao：Spread spectrum codeword sequence；
UI：By the output sequence after spread spectrum；
Xn：The output sequence of continuous phase encoder CPE5；
CI：The output sequence of memoryless modulator 6.
Fig. 2 is the one embodiment of the present invention in Gaussian channel, based on receiver of the invention by reception antenna
（8）, CPM demodulators（9）, CPM soft-output coding modules（CPM-SISO）（10）, despreading mapper（11）, solution random interleaving
Device（12）, weighting processing module（13）, LDPC code soft-output coding module（LDPC-SISO）（14）, random interleaver（2）、
Spread spectrum mapper（15）, auxiliary hard decision module（16）, on-off circuit（17）With bit decision device（18）Constitute.With typical base
In unlike the iterative receiver that external information is exchanged, mapper is de-spread present invention introduces with application（11）, spread spectrum mapper
（15）With auxiliary hard decision module（16）.Each symbol in Fig. 2 is defined as follows：
r(t)：Reception antenna（8）On receive by Gaussian channel pollute CPM modulated signals；
PI(CI;in)：CPM demodulators（9）Output inner code word by bit priori probability information sequence；
PI(UI;in)：LDPC-SISO modules（14）Weighted processing module（13）, random interleaver（2）, spread spectrum mapper
（15）Output sequence afterwards；
PI(UI;out)：CPM-SISO modules（10）Interior information word after output renewal is by bit probability information sequence；
PI(CI;out)：CPM-SISO modules（10）The inner code word after updating is exported by bit probability information sequence, in iteration
During do not use；
Po(Co;in)：LDPC-SISO modules（14）The outer code word of input by bit priori probability information sequence；
Po(Uo;in)：LDPC-SISO modules（14）Input external information word by bit priori probability information sequence, the sequence
Meet non-uniform probability characteristic distributions；
Po(Co;out)：LDPC-SISO modules（14）Outer code word after output renewal is by bit probability information sequence；
Po(Uo;out)：LDPC-SISO modules（14）External information word after output renewal is by bit probability information sequence；
d：The output sequence of bit decision device.
Assuming that information sequence length to be sent is N, the code check of LDPC code is Rd, the length for spreading code word is Lc, then pass through
Output sequence L after LDPC encoder and DSSSsp=（N×Lc）/Rd.In receiving terminal, CPM-SISO modules（10）It is defeated
Information word is by bit probabilities sequence P in the spread spectrum for going outI(UI;In), it is assumed that all bits are that the probability sequence of " 1 " is in the sequenceAll bits are that the probability sequence of " -1 " is in the sequence
By sequence PI(UI;In despreading mapper) is delivered to（11）Corresponding despreading is completed with probability mapping.
Assuming that information sequence UoIt is { U1,U2,...Ui...,UN, wherein Ui∈ [0,1], by LDPC encoder（1）Afterwards
Output codons sequence is Co,Wherein Ci∈[-1,1].Frequency expansion sequenceIf random interleaver（2）When output bit is " 1 ", then by the codeword sequence after spread spectrumIf random interleaver（2）When output bit is " -1 ", then by the codeword sequence after spread spectrumDefinition
Despreading mapper（11）Signal processing it is as follows：
Solve expanding map purpose be by length be LspPI(UI;In) sequence mapping is reduced to length for N/RdCode word it is general
Rate sequenceWherein QiFor the definition of probability of bit " 1 " isSimilarly QiIt is bit " -1 "
Definition of probability is It is by CPM-SISO modules（10）The inner code word of output by
Bit probability information sequence ((i-1) × LSP+ m) it is individual be E1 mCode word probability.Similarly, It is by CPM-SISO modules（10）The inner code word of output is by bit probability information sequence ((i-1) × LSP+ m) it is individual
ForCode word probability.QiFor the normalization probability of bit " 1 " isI.e.
Equation（1）
Similarly, QiFor the normalization probability of bit " -1 " isI.e.
Equation（2）
Inner code word after solution expanding map is by bit probability information sequence through solving random interleaver（12）As weighting treatment mould
Block（13）Input, in module（13）In, α and β is taken for weight coefficient, α=0.8 in this module, β=0.01.Assuming that the module
It is { P to be input intoin(xi),i=1,2...,N/Rd, then output { the P of the moduleout(yi),i=1,2...,N/RdMeet equation（3）,
I.e.
Pout(yi)=exp((α*logePin(xi)).*exp(-β*logePin(xi))) equation（3）
Wherein .* represents point multiplication operation.
LDPC-SISO modules（14）The outer code word of output is by the weighted processing module of bit probability information sequence（13）With with
Machine interleaver（2）, random interleaver（2）The probability sequence of output isWherein WiIt is bit
The definition of probability of " 1 " is Wi 1, WiFor the definition of probability of bit " -1 " is
Spread spectrum mapper（15）Signal processing it is as follows：
DefinitionIt is spread spectrum mapper（15）Output probability sequence,It is defined as expanding
Frequency mapper（15）Output ((k-1) × Lc+ m) individual code word isProbability, represent spread spectrum mapper（15）K-th it is defeated
Enter the spread spectrum mapping probabilities sequence for the code word of bit " 1 ", similarly,It is defined as spreading mapper（15）Output
((k-1)×Lc+ m) individual code word isProbability, represent spread spectrum mapper（15）K-th input for bit " -1 " code word
Spread spectrum mapping probabilities sequence.I.e.
Equation（4）
Equation（5）
Fig. 3 is have spread spectrum and the LDPC-CPM iteration systems BER without spread spectrum to compare（Iterations is the 8th time）, choose school
It is 768 × 1536, QC-LDPC yards of code check 1/2 to test matrix dimension, and degree is distributed as λ (x)=0.2308x+0.4615x2+
0.3077x7.From figure 3, it can be seen that the LDPC-CPM iteration systems for having spread spectrum can compared with the LDPC-CPM iteration systems without spread spectrum
Can be increased substantially by property.
Claims (1)
1. a kind of parity check code spreads the iterative detection device of continuous phase modulation system, including reception antenna, CPM demodulation
Device, CPM soft-output codings module, despreading mapper, solution random interleaver, weighting processing module, LDPC code soft inputting and soft are defeated
Go out module, random interleaver, spread spectrum mapper, auxiliary hard decision module, on-off circuit and bit decision device, it is characterized in that：Connect
Receive antenna and receive the CPM modulated signals polluted by Gaussian channel, be passed to CPM demodulators and be demodulated, the output of CPM demodulators
Inner code word by bit priori probability information sequence deliver to CPM soft-output codings module and as one input, the soft inputs of CPM
The outer code word that soft output module simultaneously exports LDPC code soft-output coding module is by the weighted place of bit probability information sequence
As another input after reason module, random interleaver and spread spectrum mapper, after the output of CPM soft-output codings module updates
Interior information word by bit probability information sequence, interior information word by bit probability information sequence sequentially through despreading mapper, solution with
After machine interleaver and weighting processing module LDPC code soft inputting and soft is delivered to as outer code word by bit priori probability information sequence
Output module, the external information word of LDPC code soft-output coding module output delivers to auxiliary hard decision by bit probability information sequence
Module, auxiliary hard decision module is believed the adjacent China and foreign countries of iteration twice information word since second iteration by bit rate probability
The hard decision for ceasing sequence is compared, if hard decision of the n-th with (n-1)th time is consistent, stops iterative detection overall process simultaneously
Trigger switch circuit, while the external information word of nth iteration is delivered into bit decision device by bit probability information sequence carrying out firmly
Adjudicate and export；
The signal processing for de-spreading mapper is as follows：
Solve expanding map purpose be by length be LspPI(UI；In) sequence mapping is reduced to length for N/RdCode word probability sequence
RowWherein QiFor the definition of probability of bit " 1 " isSimilarly QiIt is the probability of bit " -1 "
It is defined as It is general by bit by the inner code word of CPM-SISO modules (10) output
Rate information sequence ((i-1) × LSP+ m) it is individual be E1 mCode word probability；Similarly,
It is the inner code word exported by CPM-SISO modules by bit probability information sequence ((i-1) × LSP+ m) individual beCode word it is general
Rate；PI(UI；In it is) the weighted processing module of LDPC-SISO modules, random interleaver, spreads the output sequence after mapper；UI
It is by the output sequence after spread spectrum；Information sequence length to be sent is N；The code check of LDPC code is Rd；Spread the length of code word
It is L to spendc
QiFor the normalization probability of bit " 1 " isI.e.
Similarly, QiFor the normalization probability of bit " -1 " isI.e.
The inner code word after expanding map is solved by bit probability information sequence through solving input of the random interleaver as weighting processing module,
In the module, α and β is taken for weight coefficient, α=0.8 in this module, β=0.01；Assuming that the input of the module is { Pin(xi),i
=1,2 ..., N/Rd, then output { the P of the moduleout(yi), i=1,2 ..., N/RdMeet equation (3), i.e.,
Pout(yi)=exp ((α * logePin(xi)).*exp(-β*logePin(xi))) equation (3)
Wherein .* represents point multiplication operation；
The outer code word of LDPC-SISO modules output by the weighted processing module of bit probability information sequence and random interleaver, with
Machine interleaver output probability sequence beWherein WiFor the definition of probability of bit " 1 " is Wi 1,
WiFor the definition of probability of bit " -1 " is Wi -1；
The signal processing for spreading mapper is as follows：
DefinitionTo spread the output probability sequence of mapper,It is defined as spreading mapper
Output ((k-1) × Lc+ m) individual code word isProbability, represent that k-th of mapper input of spread spectrum is the code of bit " 1 "
The spread spectrum mapping probabilities sequence of word, similarly,It is defined as spreading output ((the k-1) × L of mapperc+ m) individual code word isProbability, represent that k-th of mapper input of spread spectrum is the spread spectrum mapping probabilities sequence of the code word of bit " -1 "；I.e.
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