CN101699808A - Differential encoding space-time-frequency modulation method - Google Patents
Differential encoding space-time-frequency modulation method Download PDFInfo
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Abstract
The invention discloses a differential encoding space-time-frequency modulation method, and belongs to the technical field of wireless communication. The method comprises that: a mobile terminal of a communication system performs space-time encoding on an information bit sequence required to be transmitted to generate a unitary matrix code word sequence; the unitary matrix code word sequence is subjected to differential modulation to generate a matrix sequence to be transmitted; symbols in the matrix sequence to be transmitted are respectively mapped to a space domain, a time domain and a frequency domain so as to acquire a group of space-time-frequency three-dimensional signals; a plurality of groups of transmission signals are acquired through OFDM modulation, and each group of transmission signals is transmitted through a transmitter antenna; and the OFDM modulation and differential demodulation are directly carried out a receiving end, and required information is acquired. Through differential space-time-frequency block code mapping or differential space-time-frequency cyclic code mapping, the encoding and the differential modulation are respectively carried out at different dimensionalities, so that a requirement of a channel on relevance of the time domain and the frequency domain is reduced, and a requirement of reliable signal transmission in high-speed mobile environment in a wideband communication system can be met.
Description
Technical field
What the present invention relates to is a kind of method of wireless communication technology field, specifically is a kind of differential encoding space-time-frequency modulation method.
Background technology
When transmitting in the wireless environment of signal between portable terminal and base station, can be subjected to the interference of various factors in the wireless channel, as path loss, shadow fading, rapid fading, Doppler frequency shift etc., particularly when portable terminal was in the high-speed mobile, channel status can not stop to change along with the time.Therefore can use some technology to suppress these in mobile communication system and disturb, guarantee the unimpeded of communication, communication is unimpeded in particularly moving, as multiple-input and multiple-output (MIMO) technology, OFDM (OFDM) technology, diversity technique etc.
The MIMO technology makes the transmission data obtain many independently transmission paths in spatial domain by setting up many transmitting antennas and reception antenna, and system just can obtain extra diversity gain like this, improves the reliability of system.The OFDM technology can effectively be resisted multipath effect and Doppler frequency shift, improves the utilance of channel.
Present mobile communication has marched toward the 3G epoch, to 4G evolution.The third generation mobile communication system is all had higher requirement to spectrum efficiency and mobility.The standard LTE Advanced (the further evolution of 3GPP Long Term Evolution) of the 4G that faces the future that is responsible to define with 3GPP (third generation partner program) is an example, according to the evolution target of its proposition, system finally can support the reliable communication (even might need to reach 500km/h) under the high velocity environment of translational speed 350km/h.The ambulant usual practice of resolution system is to insert pilot tone and carry out reasonable pilot design in OFDM symbol or SC-FDM (single carrier frequency division is multiplexing) symbol, in order to follow the tracks of channel because the quick variation on the time domain that Doppler's expansion causes.But the continuous quickening of the translational speed of supporting along with need, pilot signal certainly will will take more frequency spectrum resource, causes the rapid decline of system transmissions efficient.Therefore in the coded modulation process of mobile communication system, how to design a kind of reliable and low differential modulation and demodulation method of complexity, avoid inserting pilot signal, make when improving the availability of frequency spectrum, can satisfy the reliable transmission of signal under the high-speed mobile environment, become the focus of research in recent years.The key that realizes differential coding in based on the system of MIMO-OFDM is that the differential coding symbol that will carry information symbol effectively is mapped on time domain, frequency domain and the spatial domain three-dimensional and sends, and utilizes channel at the correlated characteristic in time domain, frequency domain and spatial domain demodulates information to be come out then.
Through existing literature search is found, people such as Qian Ma have delivered the article that is entitled as " Differentialspace-time-frequency coded OFDM with maximum multipath diversity (the difference empty time frequency coding OFDM with maximum multipath diversity) " on " IEEE Transactions on WirelessCommunications (IEEE radio communication journal) ", this article provides a kind of method of empty time-frequency differential modulation, but this technology can only be carried out differential coding on single frequency domain or time domain, promptly coding and differential modulation are all carried out on the same dimension of time domain or frequency domain, make the demodulation of signal require channel in the OFDM symbol transmitting time section of twice transmitting antenna number, perhaps between the adjacent OFDM subcarrier of twice transmitting antenna number, therefore approximate constant, this technology is only applicable in relativity of time domain is higher or frequency domain correlation the is higher channel circumstance.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of differential encoding space-time-frequency modulation method is provided.The present invention is based on the MIMO-OFDM technology, can on different dimensions, encode respectively and differential modulation, thereby reduce the requirement of channel simultaneously, can satisfy the reliable transmission of signal under the wide-band communication system high speed mobile environment time domain and frequency domain correlation.
The present invention is achieved by the following technical solutions, may further comprise the steps:
The first step, the communication system portable terminal carries out Space Time Coding to the information bit sequence of required transmission, generates the unitary matrice codeword sequence.
Described Space Time Coding is the orthogonal block code coding, or diagonal angle cyclic code coding.
Second step, the unitary matrice codeword sequence is carried out differential modulation, generate the difference codeword sequence, these difference codeword sequences are armed matrix sequence.
The 3rd step was mapped to the symbol in the armed matrix sequence respectively on spatial domain, time domain and the frequency domain, obtained one group of empty time-frequency three dimensional signal.
Frequency block code mapping when described mapping is difference empty, or difference empty cyclic code mapping frequently the time.
The frequency block code mapping is when armed matrix sequence is the difference codeword sequence of orthogonal block code generation during described difference empty, the sign map that will belong to same emission matrix is to the same subcarrier of adjacent OFDM symbol, and the sign map that does not belong to same emission matrix is to the adjacent sub-carrier of same OFDM symbol.
Described difference empty frequently the time cyclic code mapping be when armed matrix sequence is the difference codeword sequence of diagonal angle cyclic code generation, the sign map that will belong to same emission matrix is to the adjacent sub-carrier of same OFDM symbol, and the sign map that does not belong to same emission matrix is to the same subcarrier of adjacent OFDM symbol.
The 4th step by modulating in OFDM, obtained some groups and sends signal, sent signal with every group and sent by a transmitting antenna respectively.
The 5th step, directly carry out OFDM at receiving terminal and separate the mediation differential ference spiral, obtain information needed.
Compared with prior art, the invention has the beneficial effects as follows: can encode respectively and differential modulation on different dimensions, signal is subjected to the time variation of channel little with the influence of sex change frequently, can adapt to the variation of real channel circumstance, and is stable and reliable for performance.
Description of drawings
Fig. 1 be embodiment 1 by time-domain and frequency-domain simultaneously mapping mode be mapped to principle schematic on the respective sub of OFDM symbol
Fig. 2 be embodiment 2 by time-domain and frequency-domain simultaneously mapping mode be mapped to principle schematic on the respective sub of OFDM symbol
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Under two transmitting antennas, frequency block code mapping when present embodiment adopts difference empty comprises that step is as follows:
The first step, the communication system portable terminal carries out Alamouti sign indicating number (being orthogonal block code) coding to the information bit sequence of required transmission, generates 2 * 2 unitary matrice codeword sequences, be designated as ..., D
K-1, D
k, D
K+1....
Second the step, by the differential modulation technology with the unitary matrice codeword sequence ..., D
K-1, D
k, D
K+1... in each code word be converted into 2 * 2 matrix to be launched.With code word D
kBe example, transform the matrix X to be launched that obtains
kFor:
Thereby obtain matrix sequence to be launched be designated as ..., X
K-1, X
k, X
K+1..., wherein, initial matrix to be launched equals unit matrix I
N, the symbol that every row of matrix to be launched will transmit by different antennae exactly.
The 3rd step, with the matrix sequence to be launched that obtains ..., X
K-1, X
k, X
K+1... each row glossary of symbols respectively by time-domain and frequency-domain simultaneously mapping mode be mapped on the respective sub of OFDM symbol, as shown in Figure 1, that is: for one group of adjacent matrix to be launched, as { X
K-1, X
k, the sequence of forming corresponding to the symbol that needs on the i transmit antennas to send for ..., x
1i, k-1, x
2i, k-1, x
1i, k, x
2i, k... }, to each such sequence, wherein belong to two symbols of same encoder matrix, as { x
1i, k-1, x
2i, k-1, be mapped on the same subcarrier of adjacent OFDM symbol; And belong to the adjacent-symbol of differential modulation, as { x
1i, k-1, x
1i, k, be mapped on the adjacent sub-carrier of same OFDM symbol.
In the 4th step,, be i.e. behind IFFT (anti-fast fourier transform) conversion and the interpolation Cyclic Prefix, obtain two groups and send signals, and be sent to the base station by two transmitting antennas by modulating in OFDM.
The 5th step, directly carry out OFDM at receiving terminal and separate the mediation differential ference spiral, obtain information needed.
The advantage of present embodiment: can on different dimensions, encode respectively and differential modulation, only require channel approximate constant between the adjacent sub-carrier of one times of transmitting antenna number and in 2 OFDM symbol transmitting time sections, therefore to channel circumstance the correlation of time domain and frequency domain require loose, can adapt to the variation of real channel circumstance, stable and reliable for performance.
Under two transmitting antennas, cyclic code mapping when present embodiment adopts difference empty frequently comprises that step is as follows:
The first step, the communication system portable terminal carries out diagonal angle cyclic code coding to the information bit sequence of required transmission, generates 2 * 2 unitary matrice codeword sequences, be designated as ..., D
K-1, D
k, D
K+1....
Specifically, be one group with m information bit, carry out the diagonal angle loop coding, obtain 2
mPlant different cyclic code code words.With m=2 is example, and the code book of cyclic code is:
D
k?∈{G
0，G
1，G
2，G
3}
Wherein:
Second the step, by the differential modulation technology with the unitary matrice codeword sequence ..., D
K-1, D
k, D
K+1... in each code word be converted into 2 * 2 matrix to be launched.With code word D
kBe example, transform the matrix X to be launched that obtains
kFor:
Thereby obtain matrix sequence to be launched be designated as ..., X
K-1, X
k, X
K+1..., wherein, initial matrix to be launched equals unit matrix I
N, the symbol that every row of matrix to be launched will transmit by different antennae exactly.
The 3rd step, with the matrix sequence to be launched that obtains ..., X
K-1, X
k, X
K+1... each row glossary of symbols respectively by time-domain and frequency-domain simultaneously mapping mode be mapped on the respective sub of OFDM symbol, as shown in Figure 2, that is: for one group of adjacent matrix { X to be launched
K-1, X
k, the sequence of forming corresponding to the symbol that needs on the i transmit antennas to send for ..., x
1i, k-1, x
2i, k-1, x
1i, k, x
2i, k... }, to each such sequence, wherein belong to two symbols of same encoder matrix, i.e. { x
I, k, 0} is mapped on the adjacent sub-carrier of same OFDM symbol, and belongs to the adjacent-symbol of differential modulation, i.e. { x
I, k-1, x
I, k, be mapped on the same subcarrier of adjacent OFDM symbol.
In the 4th step,, be i.e. behind IFFT conversion and the interpolation Cyclic Prefix, obtain two groups and send signals, and be sent to the base station by two transmitting antennas by modulating in OFDM.
The 5th step, directly carry out OFDM at receiving terminal and separate the mediation differential ference spiral, obtain information needed.
The advantage of present embodiment: can on different dimensions, encode respectively and differential modulation, only require channel approximate constant in the OFDM of one times of transmitting antenna number symbol transmitting time section, the channel relevancy of antithetical phrase intercarrier has no requirement, can adapt to the variation of real channel circumstance, stable and reliable for performance.
Claims (5)
1. a differential encoding space-time-frequency modulation method is characterized in that, comprises that step is as follows:
The first step, the communication system portable terminal carries out Space Time Coding to the information bit sequence of required transmission, generates the unitary matrice codeword sequence;
Second step, the unitary matrice codeword sequence is carried out differential modulation, generate the difference codeword sequence, these difference codeword sequences are armed matrix sequence;
The 3rd step was mapped to the symbol in the armed matrix sequence respectively on spatial domain, time domain and the frequency domain, obtained one group of empty time-frequency three dimensional signal;
The 4th step by the OFDM modulation, obtained some groups and sends signal, sent signal with every group and sent by a transmitting antenna respectively;
The 5th step, directly carry out OFDM at receiving terminal and separate the mediation differential ference spiral, obtain information needed.
2. differential encoding space-time-frequency modulation method according to claim 1 is characterized in that, the Space Time Coding described in the first step is the orthogonal block code coding, or diagonal angle cyclic code coding.
3. differential encoding space-time-frequency modulation method according to claim 1 is characterized in that, the mapping described in the 3rd step is the frequency block code mapping when being difference empty, or difference empty cyclic code mapping frequently the time.
4. differential encoding space-time-frequency modulation method according to claim 3, it is characterized in that, the frequency block code mapping is that the sign map that will belong to same emission matrix is to the same subcarrier of adjacent OFDM symbol when armed matrix sequence is the difference codeword sequence of orthogonal block code generation during described difference empty.
5. differential encoding space time-frequency method of adjustment according to claim 3, it is characterized in that, described difference empty frequently the time cyclic code mapping be that the sign map that will belong to same emission matrix is to the adjacent sub-carrier of same OFDM symbol when armed matrix sequence is the difference codeword sequence of diagonal angle cyclic code generation.
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| CN103208996A (en) * | 2013-04-17 | 2013-07-17 | 北京航空航天大学 | Method for coding frequency domains of quasi-cyclic codes |
| CN106877981A (en) * | 2017-03-15 | 2017-06-20 | 北京北广科技股份有限公司 | A kind of supper-fast shortwave is burst coding modulation technique |
| GB2550477A (en) * | 2016-03-31 | 2017-11-22 | The Sec Dep For Foreign And Commonwealth Affairs | Waveform, method of generation and receiving the same, transmitting and receiving means |
| CN107959519A (en) * | 2016-10-17 | 2018-04-24 | 北京三星通信技术研究有限公司 | A kind of difference space modulation transmission method, transmitter and receiver |
| CN108540185A (en) * | 2018-04-17 | 2018-09-14 | 电子科技大学 | A kind of difference modulating method of combination Space-Time Block Coding |
| CN108737305A (en) * | 2018-05-29 | 2018-11-02 | 西安交通大学 | A kind of frequency difference UNB method for communication transmission of overlapping square phase-couple |
| CN109995404A (en) * | 2018-12-17 | 2019-07-09 | 郑州大学 | A kind of differential modulation and demodulation method of empty frequency domain modulation |
| CN110086743A (en) * | 2019-03-14 | 2019-08-02 | 西安电子科技大学 | A kind of short burst MIMO-OFDM communication system and method based on differential encoding |
| CN111713053A (en) * | 2018-02-20 | 2020-09-25 | 三菱电机株式会社 | Transmitting apparatus and subcarrier mapping method |
| CN114050891A (en) * | 2021-07-22 | 2022-02-15 | 东南大学 | Space-time two-dimensional channel coding method |
| WO2023142825A1 (en) * | 2022-01-25 | 2023-08-03 | 华为技术有限公司 | Data processing method and apparatus, and related device |
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2009
- 2009-11-12 CN CN200910309575A patent/CN101699808A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103208996A (en) * | 2013-04-17 | 2013-07-17 | 北京航空航天大学 | Method for coding frequency domains of quasi-cyclic codes |
| CN103208996B (en) * | 2013-04-17 | 2016-06-22 | 北京航空航天大学 | The Frequency Domain Coding method of quasi-cyclic code |
| GB2550477B (en) * | 2016-03-31 | 2020-04-29 | The Sec Dep For Foreign And Commonwealth Affairs | Waveform, method of generation and receiving the same, transmitting and receiving means |
| GB2550477A (en) * | 2016-03-31 | 2017-11-22 | The Sec Dep For Foreign And Commonwealth Affairs | Waveform, method of generation and receiving the same, transmitting and receiving means |
| CN107959519A (en) * | 2016-10-17 | 2018-04-24 | 北京三星通信技术研究有限公司 | A kind of difference space modulation transmission method, transmitter and receiver |
| CN107959519B (en) * | 2016-10-17 | 2022-06-24 | 北京三星通信技术研究有限公司 | Difference space modulation transmission method, transmitter and receiver |
| CN106877981A (en) * | 2017-03-15 | 2017-06-20 | 北京北广科技股份有限公司 | A kind of supper-fast shortwave is burst coding modulation technique |
| CN111713053A (en) * | 2018-02-20 | 2020-09-25 | 三菱电机株式会社 | Transmitting apparatus and subcarrier mapping method |
| CN111713053B (en) * | 2018-02-20 | 2023-04-28 | 三菱电机株式会社 | Transmitting apparatus, control circuit, storage medium, and subcarrier mapping method |
| CN108540185A (en) * | 2018-04-17 | 2018-09-14 | 电子科技大学 | A kind of difference modulating method of combination Space-Time Block Coding |
| CN108540185B (en) * | 2018-04-17 | 2021-03-16 | 电子科技大学 | Differential space modulation method combined with space-time block code |
| CN108737305A (en) * | 2018-05-29 | 2018-11-02 | 西安交通大学 | A kind of frequency difference UNB method for communication transmission of overlapping square phase-couple |
| CN109995404A (en) * | 2018-12-17 | 2019-07-09 | 郑州大学 | A kind of differential modulation and demodulation method of empty frequency domain modulation |
| CN109995404B (en) * | 2018-12-17 | 2021-06-01 | 郑州大学 | Differential modulation and demodulation method for space-frequency domain modulation |
| CN110086743A (en) * | 2019-03-14 | 2019-08-02 | 西安电子科技大学 | A kind of short burst MIMO-OFDM communication system and method based on differential encoding |
| CN110086743B (en) * | 2019-03-14 | 2021-04-02 | 西安电子科技大学 | Short burst MIMO-OFDM communication system and method based on differential coding |
| CN114050891A (en) * | 2021-07-22 | 2022-02-15 | 东南大学 | Space-time two-dimensional channel coding method |
| CN114050891B (en) * | 2021-07-22 | 2024-02-27 | 东南大学 | Space-time two-dimensional channel coding method |
| WO2023142825A1 (en) * | 2022-01-25 | 2023-08-03 | 华为技术有限公司 | Data processing method and apparatus, and related device |
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Application publication date: 20100428 |