CN113938362B - Pulse position modulation method and device - Google Patents
Pulse position modulation method and device Download PDFInfo
- Publication number
- CN113938362B CN113938362B CN202111156029.5A CN202111156029A CN113938362B CN 113938362 B CN113938362 B CN 113938362B CN 202111156029 A CN202111156029 A CN 202111156029A CN 113938362 B CN113938362 B CN 113938362B
- Authority
- CN
- China
- Prior art keywords
- code symbol
- pulse
- mapping
- sequence
- modulation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
- H04L25/40—Transmitting circuits; Receiving circuits
- H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
- H04L25/4902—Pulse width modulation; Pulse position modulation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a pulse position modulation method and device, and belongs to the technical field of communication. Comprising the following steps: carrying out N-ary polarization code coding on the input binary bit sequence to obtain an N-ary coding symbol sequence, wherein N is a power of 2; mapping each code symbol in the N-ary code symbol sequence into the position of K PPM modulation pulses, wherein each PPM modulation pulse has L candidate positions, L K Not less than N, and L, K are positive integers; all PPM modulated pulses are transmitted according to the determined position. The invention solves the problem that the number L of candidate pulse positions is not the power of 2 by mapping N system symbols, N being the power of 2, to the pulse positions.
Description
Technical Field
The present invention belongs to the field of communication technology, and more particularly, to a pulse position modulation method and apparatus.
Background
The principle of pulse position modulation (Pulse Position Modulation, PPM) is to generate a PPM pulse signal by encoding, the position of the pulse over a period being controlled by the binary information of the source by encoding. The amplitude and width of the pulse are kept unchanged, and the channel transmission characteristic is very good. Compared with OOK (On-Off Keying), the PPM modulation has higher power utilization and band utilization. Meanwhile, the PPM modulation has very high energy transmission efficiency, the anti-interference capability of a transmission channel is also obviously improved, and the coding circuit is simple and easy to realize, so that the PPM modulation is the modulation mode which is most suitable for long-distance communication at present.
A common channel coding method for PPM modulation is Reed-solomon coding (RS code), which is relatively traditional, and in a scenario where channel attenuation is very serious, such as long-distance transmission, performance is insufficient, an improvement of an upgraded channel coding scheme is needed. Furthermore, in some cases, the number of pulse positions of PPM modulation is not a power of 2, which makes the use of some channel codes difficult.
Disclosure of Invention
Aiming at the defects or improvement demands of the prior art, the invention provides a pulse position modulation method and equipment, thereby solving the technical problems of poor communication reliability, short transmission distance and the number of pulse positions not meeting the power of 2 in the prior art.
To achieve the above object, according to a first aspect of the present invention, there is provided a pulse position modulation method comprising:
carrying out N-ary polarization code coding on the input binary bit sequence to obtain an N-ary coding symbol sequence, wherein N is a power of 2;
mapping each code symbol in the N-ary code symbol sequence into the position of K PPM modulation pulses, wherein each PPM modulation pulse has L candidate positions, L K Not less than N, and L, K are positive integers;
all PPM modulated pulses are transmitted according to the determined position.
Preferably, the specific implementation manner of the mapping is as follows: k pulses, each pulse having L positions, L in total K A combination of seed positions, wherein M is selected as a set of selectable position combinations, wherein M is not less than N;
numbering the M optional combinations of positions from 0 to M-1;
the value c of each code symbol in the N-system code symbol sequence is an integer of 0-N-1, the optional position combination sequence number p of the corresponding K pulses is an integer of 0-M-1, and the code symbol with the value c is mapped to the position of the corresponding K PPM modulation pulses combined at the c optional position.
The beneficial effects are that: the invention provides more possibility for subsequent scrambling by selecting M kinds of combinations of optional positions as a set of optional position combinations, wherein M is greater than or equal to N.
Preferably, the specific implementation manner of the mapping is as follows:
and mapping each code symbol in the N-system code symbol sequence to the optional position combination of every K PPM modulation pulses by adopting a mapping function to obtain the position of each PPM modulation pulse.
The beneficial effects are that: the invention increases randomness by disturbing the mapping function, and improves anti-interference capability and confidentiality capability.
Preferably, the mapping function is pWhen mapping, the value c of the N-ary code symbol is expressed as (c 1 ,c 2 ,…,c n ) The binary representation mapped to the optional position combination sequence number p is (c n ,c n-1 ,…,c 1 ) Where n=log 2 N。
Preferably, the mapping function is: p=mod (ac, M), where mod (ac, M) represents a multiplication of a and c, and then modulo-operates on M, where a and M are mutually prime, a is a scrambling parameter, c is a value of a code symbol in the N-ary code symbol sequence, and p is an optional position combination sequence after c is mapped.
Preferably, the mapping function is: p=mod (q+b, M), where mod (q+b, M) represents the sum of q and b, and modulo M; d=mod (c+a, N), mod (c+a, N) representing the sum of c and a, modulo N; d is an integer of 0 to N-1, and d is represented as (d) 1 ,d 2 ,…,d n ) Q is an integer of 0 to N-1, and q is represented as (d) n ,d n-1 ,…,d 1 ) C is the value of a code symbol in an N-system code symbol sequence, p is the optional position combination sequence number after c mapping, and a and b are parameters for disturbing c and q respectively.
To achieve the above object, according to a second aspect of the present invention, there is provided a pulse position modulation apparatus comprising: a computer readable storage medium and a processor;
the computer-readable storage medium is for storing executable instructions;
the processor is configured to read executable instructions stored in the computer readable storage medium and perform the method of the first aspect.
To achieve the above object, according to a third aspect of the present invention, there is provided a pulse position modulation apparatus comprising:
the device side interface is used for acquiring bits to be coded;
a signal processor for performing the method as described in the first aspect;
and the network side interface is used for outputting PPM modulation pulses.
To achieve the above object, according to a fourth aspect of the present invention, there is provided a pulse position modulation apparatus comprising: circuitry and an interface for performing the method as described in the first aspect.
Preferably, the device is for wireless communication.
In general, the above technical solutions conceived by the present invention have the following beneficial effects compared with the prior art:
the invention provides a pulse position modulation method, which is characterized in that an N-ary polarization code is carried out on an input binary bit sequence to obtain an N-ary code symbol sequence, wherein N is the power of 2; mapping each code symbol in the N-ary code symbol sequence into the position of K PPM modulation pulses, wherein each PPM modulation pulse has L candidate positions, L K Not less than N, and L, K are positive integers, thereby solving the technical problem that the number of pulse positions does not satisfy the power of 2.
(2) The invention provides three preferable scrambling mapping modes, and the scrambling mapping function increases the randomness of the mapping process and improves the anti-interference capability and confidentiality capability of communication. In addition, when a small synchronization deviation occurs during demodulation, the foregoing p may have a small deviation during reception, and c calculated from p may have a large deviation because of the disturbance of the mapping function, so as to avoid decoding to obtain a decoding result similar to the correctly encoded symbol but in error.
Drawings
FIG. 1 is a flowchart of a pulse position modulation method according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for adding a scrambling mapping function according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
As shown in fig. 1, the present invention provides a pulse position modulation method, which includes:
carrying out N-ary polarization code coding on the input binary bit sequence to obtain an N-ary coding symbol sequence, wherein N is a power of 2;
mapping each code symbol in the N-ary code symbol sequence into the position of K PPM modulation pulses, wherein each PPM modulation pulse has L candidate positions, L K Not less than N, and L, K are positive integers;
all PPM modulated pulses are transmitted according to the determined position.
Preferably, the specific implementation manner of the mapping is as follows: k pulses, each pulse having L positions, L in total K A combination of seed positions, wherein M is selected as a set of selectable position combinations, wherein M is not less than N;
numbering the M optional combinations of positions from 0 to M-1;
the value c of each code symbol in the N-system code symbol sequence is an integer of 0-N-1, the optional position combination sequence number p of the corresponding K pulses is an integer of 0-M-1, and the code symbol with the value c is mapped to the position of the corresponding K PPM modulation pulses combined at the c optional position.
Preferably, the specific implementation manner of the mapping is as follows:
and mapping each code symbol in the N-system code symbol sequence to the optional position combination of every K PPM modulation pulses by adopting a mapping function to obtain the position of each PPM modulation pulse.
Preferably, the mapping function is p=f (c), and when mapping, the value c of the N-ary code symbol is expressed as (c 1 ,c 2 ,…,c n ) The binary representation mapped to the optional position combination sequence number p is (c n ,c n-1 ,…,c 1 ) Where n=log 2 N。
Preferably, the mapping function is: p=mod (ac, M), where mod (ac, M) represents a multiplication of a and c, and then modulo-operates on M, where a and M are mutually prime, a is a scrambling parameter, c is a value of a code symbol in the N-ary code symbol sequence, and p is an optional position combination sequence after c is mapped.
Preferably, the mapping function is: p=mod (q+b, M), where mod (q+b, M) represents the sum of q and b, and modulo M; d=mod (c+a, N), mod (c+a, N) representing the sum of c and a, modulo N; d is an integer of 0 to N-1, and d is represented as (d) 1 ,d 2 ,…,d n ) Q is an integer of 0 to N-1, and q is represented as (d) n ,d n-1 ,…,d 1 ) C is the value of a code symbol in an N-system code symbol sequence, p is the optional position combination sequence number after c mapping, and a and b are parameters for disturbing c and q respectively.
In the preferred embodiment, the input bit sequence contains 96 bits, which are first encoded with a 8-ary polar code, i.e., n=8, with a 96/log result 2 (8) The PPM modulation uses 3-ary modulation, i.e., l=3, i.e., 3 candidate positions for each PPM modulation pulse, with each 8-ary code symbol mapped to a position of 2 PPM pulses.
2 PPM pulses with 3 2 The 9 combinations of positions are (0, 0), (0, 1), (0, 2), (1, 0), (1, 1), (1, 2), (2, 0), (2, 1), (2, 2), wherein the first number represents the position of the first PPM pulse and the second number represents the position of the second PPM pulse, respectively.
The first 8 of these are selected as optional position combinations, i.e. m=8, (0, 0), (0, 1), (0, 2), (1, 0), (1, 1), (1, 2), (2, 0), (2, 1), respectively numbered 0,1,2,3,4,5,6,7.
Example 1: the value c of the 8-system code symbol is an integer from 0 to 7, the combination number p of the optional positions of the two PPM modulation pulses is an integer from 0 to 7, and the mapping method is that p=c, namely the code symbol with the value c is mapped to the position of the two PPM modulation pulses corresponding to the combination of the c optional positions. For example c=1, the positions of the two pulses are 0 and 1, respectively.
Example 2: for one form of scrambling mapping function, the binary sequence of c is denoted (c 1 ,c 2 ,c 3 ) The binary sequence of p is the reverse of c, i.e., p=(c 3 ,c 2 ,c 1 ) For example, c has a value of 1, its binary sequence is denoted as (0, 1), the binary sequence of p is denoted as (1, 0), and the value of p is 4, i.e. the code symbol having a value of 1 is mapped to the optional position combination number 4, i.e. the positions of the two PPM pulses are 1 and 1, respectively.
Example 3: for one form of scrambling mapping function, d=mod (c for the i-th code symbol i +a i 8), d is an integer of 0 to 7, and the binary sequence of d is expressed as (d) 1 ,d 2 ,d 3 ) Q is an integer of 0 to 7, and its binary sequence is represented as (d 3 ,d 2 ,d 1 )，p i ＝mod(q+b i 8), e.g. for a 1 ＝1，b 1 ＝1，a 2 ＝2，b 2 =2, 1 st code symbol takes the value c 1 Is 1, then d=mod (1+1, 16) =2, q=2, p 1 =mod (2+1, 8) =3, i.e. the 1 st code symbol takes on a value of 1 and maps to the 3 rd optional position combination; the 2 nd code symbol takes the value c 2 Is 1, then d=mod (1+2, 8) =3, q=6, p 2 =mod (6+2, 8) =0, i.e. the 2 nd code symbol takes a value of 1 and maps to the 0 th optional position combination.
It will be readily appreciated by those skilled in the art that the foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (8)
1. A method of pulse position modulation, the method comprising:
carrying out N-ary polarization code coding on the input binary bit sequence to obtain an N-ary coding symbol sequence, wherein N is a power of 2;
mapping each code symbol in the N-system code symbol sequence into the positions of K PPM modulation pulses, wherein each PPM modulation pulse has L candidate positions, L≡K is larger than or equal to N, and L, K is a positive integer;
transmitting all PPM modulation pulses according to the determined positions;
the specific implementation mode of the mapping is as follows: k pulses, each pulse having L positions, L in total K A combination of seed positions, wherein M is selected as a set of selectable position combinations, wherein M is not less than N;
numbering the M optional combinations of positions from 0 to M-1;
the value c of each code symbol in the N-system code symbol sequence is an integer of 0-N-1, the optional position combination sequence number p of the corresponding K pulses is an integer of 0~M-1, and the code symbol with the value c is mapped to the position of the corresponding K PPM modulation pulses combined at the c optional position;
the specific implementation mode of the mapping is as follows:
and mapping each code symbol in the N-system code symbol sequence to the optional position combination of every K PPM modulation pulses by adopting a mapping function to obtain the position of each PPM modulation pulse.
2. The method of claim 1, wherein the mapping function is p=f (c), and when mapped, the N-ary coded symbol values c are binary representations (c 1, c2, …, cn), and binary representations mapped to the optional position combination sequence numbers p are (cn, cn-1, …, c 1), wherein,。
3. the method of claim 1, wherein the mapping function is: p=mod (ac, M), where mod (ac, M) represents a multiplication of a and c, and then modulo-operates on M, where a and M are mutually prime, a is a scrambling parameter, c is a value of a code symbol in the N-ary code symbol sequence, and p is an optional position combination sequence after c is mapped.
4. The method of claim 1, wherein the mapping function is: p=mod (q+b, M), where mod (q+b, M) represents the sum of q and b, and modulo M; d=mod (c+a, N), mod (c+a, N) representing the sum of c and a, modulo N; d is an integer of 0-N-1, d is expressed as (d 1, d2, …, dn), q is an integer of 0-N-1, q is expressed as (dn, dn-1, …, d 1), c is the value of a code symbol in the N-system code symbol sequence, p is the optional position combination sequence after c mapping, and a and b are parameters for disturbing c and q respectively.
5. A pulse position modulation apparatus, the apparatus comprising: a computer readable storage medium and a processor;
the computer-readable storage medium is for storing executable instructions;
the processor is configured to read executable instructions stored in the computer readable storage medium and perform the method of any one of claims 1 to 4.
6. A pulse position modulation apparatus, the apparatus comprising:
the device side interface is used for acquiring bits to be coded;
a signal processor for performing the method of any one of claims 1 to 4;
and the network side interface is used for outputting PPM modulation pulses.
7. A pulse position modulation apparatus, characterized in that the pulse position modulation apparatus comprises: circuitry and an interface for performing the method of any of claims 1 to 4.
8. The apparatus of any of claims 5 to 7, wherein the apparatus is for wireless communication.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111156029.5A CN113938362B (en) | 2021-09-30 | 2021-09-30 | Pulse position modulation method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111156029.5A CN113938362B (en) | 2021-09-30 | 2021-09-30 | Pulse position modulation method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113938362A CN113938362A (en) | 2022-01-14 |
| CN113938362B true CN113938362B (en) | 2023-08-04 |
Family
ID=79277663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111156029.5A Active CN113938362B (en) | 2021-09-30 | 2021-09-30 | Pulse position modulation method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113938362B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006073371A1 (en) * | 2005-01-03 | 2006-07-13 | Matsushita Electric Industrial Co., Ltd. | Method and apparatus for pulse mapping in impulse radio modulation |
| CN108540409A (en) * | 2017-03-02 | 2018-09-14 | 恩智浦有限公司 | Processing module and associated method |
| CN109889266A (en) * | 2019-01-30 | 2019-06-14 | 华南理工大学 | The Polarization Coding method and system of visible light communication channel based on Gaussian approximation |
| CN111342934A (en) * | 2020-03-02 | 2020-06-26 | 东南大学 | Multi-level bit interleaving coding modulation method based on polarization code |
| CN112202454A (en) * | 2020-10-14 | 2021-01-08 | 重庆邮电大学 | Low-complexity selective mapping method using cyclic redundancy check |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2800327B1 (en) * | 2013-04-30 | 2017-01-04 | Telefonaktiebolaget LM Ericsson (publ) | Semi-polar modulator |
-
2021
- 2021-09-30 CN CN202111156029.5A patent/CN113938362B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006073371A1 (en) * | 2005-01-03 | 2006-07-13 | Matsushita Electric Industrial Co., Ltd. | Method and apparatus for pulse mapping in impulse radio modulation |
| CN108540409A (en) * | 2017-03-02 | 2018-09-14 | 恩智浦有限公司 | Processing module and associated method |
| CN109889266A (en) * | 2019-01-30 | 2019-06-14 | 华南理工大学 | The Polarization Coding method and system of visible light communication channel based on Gaussian approximation |
| CN111342934A (en) * | 2020-03-02 | 2020-06-26 | 东南大学 | Multi-level bit interleaving coding modulation method based on polarization code |
| CN112202454A (en) * | 2020-10-14 | 2021-01-08 | 重庆邮电大学 | Low-complexity selective mapping method using cyclic redundancy check |
Non-Patent Citations (1)
| Title |
|---|
| Polar-Coded Pulse Position Modulation for the Poisson Channel;Delcho Donev, .etc;《2018 9th Advanced Satellite Multimedia Systems Conference and the 15th Signal Processing for Space Communications Workshop (ASMS/SPSC)》;20180912;正文第1-3节，图2-3 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113938362A (en) | 2022-01-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105359445B (en) | For being modulated data to carry out the method and system of optic communication | |
| CN105308867B (en) | For being modulated data to carry out the method and system of optic communication | |
| JP6481913B2 (en) | Polar code generation method and apparatus | |
| US10601629B2 (en) | Virtual lookup table for probabilistic constellation shaping | |
| CN111010255B (en) | IM/DD transmission method and system based on polarization code coding | |
| Seidl et al. | Aspects of polar-coded modulation | |
| US20200267036A1 (en) | Method for Spreading Data Symbol Frequency Domain Information in Power Line Carrier Communication | |
| CN108270515A (en) | Coding method and device | |
| US9071383B2 (en) | Modified orthogonal polynomials based hybrid coded-modulation for multi-Tb/second optical transport | |
| CN110061803B (en) | Low-complexity polar code bit interleaving coding modulation method | |
| CN110233698B (en) | Method for encoding and decoding polarization code, transmitting device, receiving device, and medium | |
| KR20220085049A (en) | Device for multi-level encoding | |
| CN102868482B (en) | Multilevel Coded Modulation method and device | |
| US11539463B2 (en) | Methods and computing device for facilitating multiple access in a wireless communication network | |
| CN113938362B (en) | Pulse position modulation method and device | |
| US11283545B2 (en) | Modulation method and apparatus | |
| CN110535805B (en) | Additional information transmission method based on constellation rotation | |
| CN101971588B (en) | Techniques for multiple-subcarrier joint precoding | |
| CN101971587B (en) | Method for accelerating the precoding and pre-decoding of symbols in OFDM systems | |
| CN110445554A (en) | A kind of incoherent underwater acoustic communication method and system based on the actual channel statistics of fading | |
| CN112825558B (en) | Encoding method, decoding method and device | |
| US7388522B2 (en) | Sequentially decoded low density parity coding (LDPC) forward error correction (FEC) in orthogonal frequency division modulation (OFDM) systems | |
| CN115603858A (en) | Transmission method and device | |
| CN115441985A (en) | Data transmission method, device and storage medium | |
| Kim et al. | A multi-code biorthogonal code keying with constant amplitude coding |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |