CN109194443A - Code modulating method, readable storage medium storing program for executing and terminal based on APSK constellation mapping - Google Patents
Code modulating method, readable storage medium storing program for executing and terminal based on APSK constellation mapping Download PDFInfo
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- CN109194443A CN109194443A CN201810985969.7A CN201810985969A CN109194443A CN 109194443 A CN109194443 A CN 109194443A CN 201810985969 A CN201810985969 A CN 201810985969A CN 109194443 A CN109194443 A CN 109194443A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0057—Block codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0061—Error detection codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0071—Use of interleaving
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/3405—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
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Abstract
A kind of code modulating method, readable storage medium storing program for executing and terminal based on APSK constellation mapping, which comprises information bit to be transmitted is grouped based on error protection degree, obtains corresponding multiple bit groupings；Low density parity check code corresponding with its error protection degree is respectively adopted to the information bit in obtained the multiple bit groupings to encode; so that the difference between the error rate of translation of the information bit in the multiple bit groupings is located in preset range, corresponding coded-bit is obtained；The corresponding coded-bit of obtained multiple bit groupings is subjected to Bit Interleave, obtains corresponding interleaving bits；Obtained interleaving bits are subjected to APSK constellation mapping, obtain corresponding APSK constellation mapping symbols.Above-mentioned scheme can reduce the bit error rate when encoding based on APSK constellation mapping to the information of input, improve the communication quality of communication system.
Description
Technical field
The present invention relates to field of communication technology, more particularly to a kind of code modulating method based on APSK constellation mapping,
Readable storage medium storing program for executing and terminal.
Background technique
Amplitude-phase shift keying (Amplitude and Phase Shift Keying, APSK) be a kind of high-order amplitude with
Phase combining modulation technique.With quadrature amplitude modulation (Quadrature Amplitude Modulation, QAM) difference, amplitude
Phase-shift keying has unique star-like constellation structures, has excellent anti-non-linear distortion ability, is highly suitable for satellite communication
Etc. nonlinear channels environment, have very high researching value.Wherein, in terms of channel capacity, amplitude-phase shift keying is better than biography
The quadrature amplitude modulation of system；In terms of the bit error rate, when using low density parity check code (Low Density Parity
Check Code, LDPC) when being encoded to the information bit of input, the performance and quadrature amplitude modulation ten of amplitude-phase shift keying
Tap is close, or even is slightly better than quadrature amplitude modulation.Therefore second generation digital satellite broadcasting standard (DVB-S2) and Chinese broadband electricity
Amplitude-phase shift keying modulation and low density parity check code have been used in the normative documents such as line of force communication standardization white paper
Combination.
Traditional low density parity check code-amplitude-phase shift keying modulating system often omits bit interleaver, this be because
For low density parity check code itself there is randomness can recognize under the premise of low-density odd/even check code matrix design is good
There is inherent intertexture for its code word, therefore pass through the codeword sequence that low density parity check code encoder comes out and be routed directly to shake
Width phase shift keying modulation module carries out constellation mapping, and continuous m bit can be mapped as a constellation on APSK constellation figure
On symbolic point.
But the information bit of input is encoded using the existing code modulating method based on APSK constellation mapping
When, it there is a problem that the bit error rate is high, seriously affected the communication quality of communication system.
Summary of the invention
Present invention solves the technical problem that be how based on APSK constellation mapping the information of input is encoded when drop
Low error rate improves the communication quality of communication system.
In order to solve the above technical problems, the embodiment of the invention provides a kind of coded modulation sides based on APSK constellation mapping
Method, which comprises
Information bit to be transmitted is grouped based on error protection degree, obtains corresponding multiple bit groupings；
Information bit in obtained the multiple bit groupings is respectively adopted corresponding with its error protection degree
Low density parity check code is encoded, so that between the error rate of translation of the information bit in the multiple bit groupings
Difference is located in preset range, obtains corresponding coded-bit；
The corresponding coded-bit of obtained multiple bit groupings is subjected to Bit Interleave, obtains corresponding interleaving bits；
Obtained interleaving bits are subjected to APSK constellation mapping, obtain corresponding APSK constellation mapping symbols.
Optionally, the error protection degree is determined by the way of following:
By carrying out modeling and simulating to 2m-APSK mapping and soft de-mapped system, calculates and mapped under the conditions of presetting signal-to-noise ratio
The bit error rate between m information bit on to an APSK constellation symbol；M is the integer more than or equal to 3；
Based on the bit error rate between m information bit being calculated, the m letter under the conditions of the default signal-to-noise ratio is determined
Cease the error protection degree of bit.
Optionally, described that the corresponding coded-bit of obtained multiple bit groupings is subjected to Bit Interleave, it is corresponded to
Interleaving bits, comprising:
Based on the corresponding relationship between coded-bit and mapped bits, by the coded-bit of multiple bit groupings point
Not Xie Ru interleaver matrix correspondence row, and by the coded-bit in the interleaver matrix by column output, obtain corresponding intertexture ratio
It is special.
Optionally, m is equal to 6.
Optionally, the value range of the default signal-to-noise ratio is 0 to 15dB.
Optionally, the 2m-APSK soft de-mapped system carries out soft de-mapped using following formula:
Wherein, LLR (bI, k) indicate APSK constellation mapping symbols in i-th of constellation symbol k-th of bit demapping ratio
Spy, x indicate the information that transmitting terminal is sent, yiIndicate i-th of the information that receiving end receives,WithIt respectively indicates on planisphere
The set for all symbolic points that k-th of bit is 1 and 0, σ2Indicate the variance of white Gaussian noise, h indicates channel gain.
The embodiment of the invention also provides a kind of computer readable storage mediums, are stored thereon with computer instruction, described
Computer instruction executes the step of code modulating method described in any of the above embodiments based on APSK constellation mapping when running.
The embodiment of the invention also provides a kind of terminal, including memory and processor, energy is stored on the memory
Enough computer instructions run on the processor, the processor execute any of the above-described when running the computer instruction
The step of described code modulating method based on APSK constellation mapping.
Compared with prior art, the technical solution of the embodiment of the present invention has the advantages that
Above-mentioned scheme, by being grouped based on error protection degree to information bit to be transmitted, and to acquired
The multiple bit groupings in information bit low density parity check code corresponding with its error protection degree is respectively adopted
It is encoded, the error code between the information bit of different error protection degree can be reduced in the case where not increasing coding redundancy degree
Rate gap improves the communication quality of communication system so as to reduce the bit error rate of communication system.
Detailed description of the invention
Fig. 1 is the flow diagram for the code modulating method that one of embodiment of the present invention is mapped based on APSK constellation；
Fig. 2 be 0~35dB for signal-to-noise ratio under conditions of be mapped to six information ratios on an APSK constellation symbolic point
The special bit error rate-signal-to-noise ratio schematic diagram；
Fig. 3 be 0~15dB for signal-to-noise ratio under conditions of be mapped to six information ratios on an APSK constellation symbolic point
The special bit error rate-signal-to-noise ratio schematic diagram；
Fig. 4 is in six information bits being mapped on an APSK constellation symbolic point in the embodiment of the present invention
The error performance schematic diagram of the bit groupings where bit groupings and b4b6 where b1b2b3b5 bit；
Fig. 5 is the encoding ratio obtained after encoding in the embodiment of the present invention for the information bit in different bit groupings
The schematic diagram that spy is interleaved；
Fig. 6 is the structural schematic diagram of the code modulation system based on 64-APSK constellation mapping in the embodiment of the present invention；
Fig. 7 is the coded modulation scheme that comprehensive code rate is 0.5 in present example and the biography using same code rate LDPC code
The error performance contrast schematic diagram of system coded modulation scheme；
Fig. 8 is the structural schematic diagram for the code modulation system that one of embodiment of the present invention is mapped based on APSK constellation.
Specific embodiment
In the prior art, the code modulating method based on APSK constellation mapping, because of m ratio being mapped on each symbolic point
There is unequal error protection, when the LDPC code using same code rate is to the information bit of different error protection degree between spy
When being encoded, the information bit of a part of mistake low degree protection increases communication so that the decoding performance of LDPC code reduces
The bit error rate of system affects the communication quality of communication system.
Technical solution in the embodiment of the present invention is by dividing information bit to be transmitted based on error protection degree
Group, and the information bit in obtained the multiple bit groupings is respectively adopted corresponding with its error protection degree low close
Degree parity check code is encoded, and can reduce the letter of different error protection degree under conditions of not increasing coding redundancy degree
Bit error rate gap between breath bit improves the communication quality of communication system so as to reduce the bit error rate of communication system.
It is understandable to enable above-mentioned purpose of the invention, feature and beneficial effect to become apparent, with reference to the accompanying drawing to this
The specific embodiment of invention is described in detail.
Fig. 1 is a kind of flow diagram of code modulating method based on APSK constellation mapping of the embodiment of the present invention.Such as
Shown in Fig. 1, a kind of code modulating method based on APSK constellation mapping of the embodiment of the present invention can specifically include following step
It is rapid:
Step S101: being grouped information bit to be transmitted based on error protection degree, obtains corresponding multiple ratios
Spy's grouping.
In specific implementation, it can be determined default by carrying out modeling and simulating to 2m-APSK mapping and soft de-mapped system
Under the conditions of signal-to-noise ratio, a continuous information ratio of m (m be more than or equal to 3 integer) for being mapped on an APSK constellation symbol
Error protection degree between spy.Specifically, by carrying out modeling and simulating, meter to 2m-APSK mapping and soft de-mapped system
The bit error rate being mapped between m information bit on an APSK constellation symbol under the conditions of presetting signal-to-noise ratio is calculated, and based on
The bit error rate between m obtained information bit determines the mistake guarantor of the m information bit under the conditions of the default signal-to-noise ratio
Shield degree.Wherein, the bit error rate is that the specific data of m information bit error protection embody.Wherein, the bit error rate is higher, mistake
Degree of protection is weaker, and the bit error rate is lower, and the degree of error protection is stronger.
In an embodiment of the present invention, information bit to be transmitted is grouped based on error protection degree, is obtained pair
It is the 256 and APSK lower than 256 for order when the multiple bit groupings answered, to reduce hardware complexity, m can be believed
Breath bit is divided into two groups；And for the APSK of higher-order number, then it can be by m information bit point depending on the specific bit error rate situation of each bit
It is three groups or three groups or more.It specifically, can be first to preset noise in m information bit on each symbol of 2m-APSK
Same group is classified as than constellation bit similar in bit error rate performance in section.Wherein, the constellation bit that the bit error rate significantly deteriorates is mentioned
It is taken as being same group, and makes the number of constellation bit in the group less than m/2.Then, according to the group technology pair of constellation bit
Information bit to be transmitted carries out respective packets, as long as ensuring the ratio between information bit difference group bit number and constellation bit difference group
The ratio between bit number is identical.
Wherein, in an embodiment of the present invention, the 2m-APSK soft de-mapped system carries out soft solution using following formula
Mapping:
Wherein, LLR (bI, k) indicate APSK constellation mapping symbols in i-th of constellation symbol k-th of bit demapping ratio
Spy, x indicate the information that transmitting terminal is sent, yiIndicate i-th of the information that receiving end receives,WithIt respectively indicates on planisphere
The set for all symbolic points that k-th of bit is 1 and 0, σ2Indicate the variance of white Gaussian noise, h indicates channel gain.Work as determination
Error protection journey between the continuous information bit of m be mapped in information bit to be transmitted on an APSK constellation symbol
When spending, error protection degree in m every in information bit to be transmitted continuous information bits can be located at preset range
Multiple bits similar in error protection degree are also divided into same group as a bit groupings by interior information bit, from
And obtain corresponding multiple bit groupings.
Step S102: the information bit in obtained the multiple bit groupings is respectively adopted and its error protection journey
It spends corresponding low density parity check code to be encoded, so that the decoding error code of the information bit in the multiple bit groupings
Difference between rate is located in preset range, obtains corresponding coded-bit.
It in specific implementation, can be lower to error protection degree of protection when obtaining corresponding multiple bit groupings
Using code rate, lower, the preferable LDPC code of error-correcting performance is encoded information bit in bit groupings, and to error protection journey
The information bit spent in higher bit groupings can then be compiled using the LDPC code that code rate is higher, relative error performance is poor
Code, with the bit error rate gap reduced between the uneven error protection data of APSK, so that it is whole to promote code modulation system
Performance.
In an embodiment of the present invention, it by carrying out modeling and simulating to 2m-APSK mapping and soft de-mapped system, will reflect
After the completion of the continuous information bit bit groupings of m be mapped on an APSK constellation symbol, to each by way of traversal
The code rate of the corresponding LDPC code of bit groupings is adjusted separately, so that used by each bit groupings determined by final
The code rate of LDPC code can make it is very close between the bit error rate after the data decoding of obtained multiple bit groupings, with contracting
The gap between the bit error rate after the data decoding of the small information bit by different error protection degree.
Step S103: the corresponding coded-bit of obtained multiple bit groupings is subjected to Bit Interleave, is obtained corresponding
Interleaving bits.
In specific implementation, when correspondence code is respectively adopted in the continuous information bits of m every in information bit to be transmitted
When the LDPC code of rate is encoded to obtain corresponding coded-bit, can by the corresponding coded-bit of different bit groupings according to
Corresponding relationship between mapped bits is respectively written into the bit groupings in interleaver matrix in corresponding row,.Then, then by institute
The obtained coded-bit in interleaver matrix is exported by column, can obtain corresponding interleaving bits, i.e. code word.
Step S104: carrying out APSK constellation mapping for obtained interleaving bits, obtains corresponding APSK constellation mapping symbol
Number.
In specific implementation, when obtaining corresponding interleaving bits, APSK modulation is carried out to obtained interleaving bits, i.e.,
Available corresponding APSK constellation mapping symbols.
In order to enable the technical solution in the embodiment of the present invention easily facilitates understanding, below in conjunction with specific example to this
The code modulating method based on APSK constellation mapping in inventive embodiments is introduced.
Firstly, being respectively indicated with b1, b2, b3, b4, b5 and b6 according to the sequence from a high position to low level and being mapped to one
6 bits on APSK symbol carry out modeling and simulating to APSK mapping and soft de-mapped system, using additive white Gaussian noise
(Additive White Gaussian Noise, AWGN) channel calculates under the conditions of different signal-to-noise ratio, six bit b1,
The bit error rate of b2, b3, b4, b5 and b6, specifically refer to Fig. 2 and Fig. 3.
From Fig. 2 and Fig. 3 it is found that in the signal-to-noise ratio section of 0~15dB, mistake of the 64-APSK for two bits of b4 and b6
Degree of protection will be lower than tetra- bits of b1, b2, b3, b5, therefore b1, b2, b3, b5 bit are divided into one group, higher using code rate, entangle
The relatively weak LDPC code of wrong performance is encoded, b4 and b6 bit is divided into one group, lower using code rate, error-correcting performance is opposite
Preferable LDPC code is encoded.
When being divided to six bits b1, b2, b3, b4, b5 and b6 for two bit groupings, by way of traversal, respectively
To the code rate difference of LDPC code used by the bit groupings and b4 where b1, b2, b3, b5 and the bit groupings where b6
It is adjusted, code rate is respectively 0.6 and 0.3 LDPC code matrix in final choice low-voltage power line communication standard.Wherein, 0.6
The LDPC code code length of code rate is that 15360,0.3 code rate LDPC code code length is 7680, and corresponding the performance test results refer to Fig. 4.
From fig. 4, it can be seen that the bit error rate after the data decoding of the bit groupings where b4 and b6, with b1, b2, b3, b5
The bit error rate after the data decoding of bit groupings where four bits is very close, is 10 in the bit error rate-4When only about
The difference of 0.06dB, therefore LDPC code used by the code modulating method based on APSK constellation mapping in the embodiment of the present invention
Code rate and bit groupings error protection degree between collocation it is reasonable.
After LDPC code used by two bit groupings has been determined, corresponding bit interleaver can be designed, so that
Corresponding relationship between the different LDPC code coded-bits mapped bits different from APSK is consistent.Referring to Fig. 5, b4 and b6
The code word of the corresponding LDPC encoder output of the bit groupings at placeEnter correspondence by row write
Interleaver matrix 1,2,3,5 rows, the corresponding LDPC encoder output of bit groupings where tetra- bits of b1, b2, b3, b5
Code wordThe 4th row and the 6th row is written, then read by column and exports interleaver, is handed over
Sequence S=(s after knitting1, s2, s3……s6N)。
Fig. 6 shows the corresponding communication system of code modulating method based on APSK constellation mapping in the embodiment of the present invention
Structural schematic diagram.Referring to Fig. 6, in transmitting terminal, the information bit of input initially enters deserializer 61, it is parallel to be divided into two-way
Data difference LDPC encoder 62 and LDPC encoder 63, LDPC encoder 62 use code rate for 0.6 LDPC code, to b1,
Tetra- bits of b2, b3 and b5 are encoded, LDPC encoder 63 use code rate for 0.3 LDPC code, to two bits of b4 and b6
It is encoded.The coded sequence that LDPC encoder 62 and LDPC encoder 63 export enters interleaver 64 simultaneously and carries out bit friendship
It knits, the sequence S=(s after being interweaved1, s2, s3……s6N), and be then passed through after APSK modulation unit 65 carries out APSK and enter
Awgn channel 66.In receiving end, awgn channel output channel bit, successively by APSK modulation unit 67, deinterleaver 68,
Ldpc decoder 69, ldpc decoder 610 and parallel-to-serial converter 611, successively respectively to APSK modulation unit 65, interleaver 64,
Operation performed by LDPC encoder 63, LDPC encoder 62 and deserializer 61 carries out corresponding contrary operation, finally sentences
Certainly export.
Referring to Fig. 7, it is respectively adopted the LDPC code of 0.3 and 0.6 code rate in above-mentioned example, synthesis code rate is 0.5, and is adopted
Error performance comparison is carried out with the traditional code modulation scheme of same code rate LDPC code, with the number of the poor b4 and b6 bit of performance
It is missed according to the error performance after decoding as the whole of the code modulating method based on APSK constellation mapping in the embodiment of the present invention
Code rate performance, better than the scheme about 0.3dB for being all made of 0.5 code rate LDPC code progress coded modulation in power line communication standard.
Therefore, the error performance of the code modulating method based on APSK constellation mapping in the embodiment of the present invention is better than existing scheme.Its
In, normalization minimum and (min-sum) algorithm, maximum number of iterations 50 is respectively adopted in above-mentioned volume ldpc decoder.
Fig. 8 show the embodiment of the invention also provides it is a kind of based on APSK constellation mapping code modulation system structure
Schematic diagram.Referring to Fig. 8, a kind of code modulation system based on APSK constellation mapping may include grouped element 801, coding list
Member 802, interleave unit 803 and APSK modulation unit 804, in which:
The grouped element 801, suitable for being divided based on acquired error protection degree information bit to be transmitted
Group obtains corresponding multiple bit groupings；
The coding unit 802, suitable for the information bit in obtained the multiple bit groupings be respectively adopted with
Its corresponding low density parity check code of error protection degree is encoded, so that the information ratio in the multiple bit groupings
Difference between special error rate of translation is located in preset range, obtains corresponding coded-bit:
The interleave unit 803, be suitable for will the corresponding coded-bit progress Bit Interleave of obtained multiple bit groupings,
Obtain corresponding interleaving bits；In an embodiment of the present invention, the interleave unit 703 is suitable for based on coded-bit and mapping
The coded-bit of multiple bit groupings is respectively written into the correspondence row of interleaver matrix by the corresponding relationship between bit, and
By the coded-bit in the interleaver matrix by column output, corresponding interleaving bits are obtained.
The APSK modulation unit 804 is suitable for obtained interleaving bits carrying out APSK constellation mapping, obtain corresponding
APSK constellation mapping symbols.
In specific implementation, described device 80 can also include determination unit 805, in which:
The determination unit 805 is suitable for calculating by carrying out modeling and simulating to 2m-APSK mapping and soft de-mapped system
The bit error rate being mapped under the conditions of default signal-to-noise ratio between m information bit on an APSK constellation symbol；M is to be greater than or wait
In 3 integer；Based on the bit error rate between m information bit being calculated, the m are determined under the conditions of the default signal-to-noise ratio
The error protection degree of information bit.In an embodiment of the present invention, m is equal to 6；The value range of the default signal-to-noise ratio is 0
To 15dB.Wherein, the 2m-APSK soft de-mapped system, suitable for carrying out soft de-mapped using following formula:
Wherein, LLR (bI, k) indicate APSK constellation mapping symbols
In i-th of constellation symbol k-th of bit de-mapped bits, x indicate transmitting terminal send information, yiIndicate that receiving end receives
I-th of the information arrived,WithRespectively indicate the set for all symbolic points that k-th of bit is 1 and 0 on planisphere, σ2Indicate high
The variance of this white noise, h indicate channel gain.
The embodiment of the invention also provides a kind of computer readable storage mediums, are stored thereon with computer instruction, described
The step of code modulating method based on APSK constellation mapping is executed when computer instruction is run.Wherein, described to be based on
The code modulating method of APSK constellation mapping refers to the introduction of preceding sections, repeats no more.
The embodiment of the invention also provides a kind of terminal, the terminal includes memory and processor, on the memory
The computer instruction that can be run on the processor is stored, the processor executes institute when running the computer instruction
The step of code modulating method based on APSK constellation mapping stated.Wherein, the coded modulation based on APSK constellation mapping
Method refers to the introduction of preceding sections, repeats no more.
Using the above-mentioned scheme in the embodiment of the present invention, by being based on error protection degree to information bit to be transmitted
It is grouped, and the information bit in obtained the multiple bit groupings is respectively adopted corresponding to its error protection degree
Low density parity check code encoded, can bit error rate gap between the information bit of different error protection degree, from
And under conditions of not increasing coding redundancy degree, the bit error rate of communication system is reduced, the communication quality of communication system is improved.
Those of ordinary skill in the art will appreciate that all or part of the steps in the various methods of above-described embodiment is can
It is completed with instructing relevant hardware by program, which can store in computer readable storage medium, and storage is situated between
Matter may include: ROM, RAM, disk or CD etc..
Although present disclosure is as above, present invention is not limited to this.Anyone skilled in the art are not departing from this
It in the spirit and scope of invention, can make various changes or modifications, therefore protection scope of the present invention should be with claim institute
Subject to the range of restriction.
Claims (8)
1. a kind of code modulating method based on APSK constellation mapping characterized by comprising
Information bit to be transmitted is grouped based on error protection degree, obtains corresponding multiple bit groupings:
Information bit in obtained the multiple bit groupings is respectively adopted corresponding with its error protection degree low close
Degree parity check code is encoded, so that the difference between the bit error rate of the information bit in the multiple bit groupings is located at
In preset range, corresponding coded-bit is obtained；
The corresponding coded-bit of obtained multiple bit groupings is subjected to Bit Interleave, obtains corresponding interleaving bits；
Obtained interleaving bits are subjected to APSK constellation mapping, obtain corresponding APSK constellation mapping symbols.
2. the code modulating method according to claim 1 based on APSK constellation mapping, which is characterized in that the mistake is protected
Shield degree is determined by the way of following:
By carrying out modeling and simulating to 2m-APSK mapping and soft de-mapped system, calculates and be mapped to one under the conditions of presetting signal-to-noise ratio
The bit error rate between m information bit on a APSK constellation symbol；M is the integer more than or equal to 3；
Based on the bit error rate between m information bit being calculated, the m information ratio under the conditions of the default signal-to-noise ratio is determined
Special error protection degree.
3. the code modulating method according to claim 2 based on APSK constellation mapping, which is characterized in that described by gained
The corresponding coded-bit of the multiple bit groupings arrived carries out Bit Interleave, obtains corresponding interleaving bits, comprising:
Based on the corresponding relationship between coded-bit and mapped bits, the coded-bit of multiple bit groupings is write respectively
Enter the correspondence row of interleaver matrix, and the coded-bit in the interleaver matrix is obtained into corresponding interleaving bits by column output.
4. the code modulating method according to claim 2 based on APSK constellation mapping, which is characterized in that m is equal to 6.
5. the code modulating method according to claim 4 based on APSK constellation mapping, which is characterized in that the default letter
Make an uproar ratio value range be 0 to 15dB.
6. the code modulating method according to claim 1-5 based on APSK constellation mapping, which is characterized in that institute
It states 2m-APSK soft de-mapped system and soft de-mapped is carried out using following formula:
Wherein, LLR (bI, k) indicate APSK constellation mapping symbols in i-th of constellation symbol k-th of bit de-mapped bits, x
Indicate the information that transmitting terminal is sent, yiIndicate i-th of the information that receiving end receives,WithIt respectively indicates on planisphere k-th
The set for all symbolic points that bit is 1 and 0, σ2Indicate the variance of white Gaussian noise, h indicates channel gain.
7. a kind of computer readable storage medium, is stored thereon with computer instruction, which is characterized in that the computer instruction fortune
Perform claim requires the step of 1 to 6 described in any item code modulating methods based on APSK constellation mapping when row.
8. a kind of terminal, which is characterized in that including memory and processor, storing on the memory can be in the processing
The computer instruction run on device, perform claim requires described in 1 to 6 any one when the processor runs the computer instruction
Based on APSK constellation mapping code modulating method the step of.
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