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Block-by-block detection method of SEFDM system based on direct expansion under low compression factor

A technology with low compression factor and detection method, applied in the field of anti-jamming transmission technology, can solve the problems of ML algorithm decline, high complexity inapplicability, high complexity of transceiver devices, etc., and achieves the effect of excellent bit error performance and reduced complexity.

Active Publication Date: 2020-07-28
HARBIN INST OF TECH
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  • Abstract
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Problems solved by technology

[0004] Due to the inherent characteristics of SEFDM, although it saves a lot of bandwidth, it makes the transceiver device face the problem of high complexity in hardware implementation, and the biggest problem it faces is the detection problem, because the orthogonality between subcarriers is destroyed Therefore, a highly complex detection method is required at the receiving end to overcome inter-carrier interference and recover data. Among the existing detection algorithms, the optimal detection algorithm is the Maximum Likehood (ML) detection algorithm. However, due to its high complexity, it becomes unsuitable for practical implementation. Other detection algorithms, such as Sphere Decoding (SD) and Fixed Sphere Decoding (FSD), are based on ML algorithms. Simplify on the above, although the performance is not as good as the ML algorithm, but the complexity is much lower for the ML algorithm

Method used

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  • Block-by-block detection method of SEFDM system based on direct expansion under low compression factor
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  • Block-by-block detection method of SEFDM system based on direct expansion under low compression factor

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specific Embodiment approach 1

[0020] The specific embodiment one, the block-by-block detection method based on the SEFDM system of direct expansion under the low compression factor, it is characterized in that, described method comprises the steps:

[0021] Step 1: At the transmitter, source data {a 0 ,a 1 ,...,a L-1} and direct spread sequence {d 0 , d 1 ,...,d M-1} multiplied to get the spreading sequence {s 0 ,s 1 ,...,s N-1}, and then through serial-to-parallel conversion, output N-way parallel data, and then fill in the end of N-way parallel data N zeros, to obtain N channels of parallel data after zero padding; N is a positive integer;

[0022] Step 2: Perform zero-padded N-way parallel data obtained in Step 1 Point IDFT transformation, after transformation, take the first N data of the output data to form a matrix S with 1 column and N rows;

[0023] Step 3: After the matrix S obtained in Step 2 undergoes parallel-to-serial conversion and a D / A converter, it undergoes radio frequency mod...

specific Embodiment

[0030] Specific embodiment: the DS-SEFDM system described in this specific embodiment includes a sending step and a receiving step;

[0031] The sending steps in this embodiment include:

[0032] Step A1, symbol mapping. The purpose of symbol mapping is to generate complex symbols for constellation mapping. From the 0,1 binary bit information of the transmitted information, through different modulation methods, several symbols are mapped into complex symbols as a group, and the four-phase constellation Taking mapping as an example, the specific steps at this stage are:

[0033] Step A11, assuming that the number of modulation phases is m, the number of transmitted information symbols is n, and the number of complex symbols after mapping is e.

[0034] Step A12, sending information 0, 1 symbol grouping, each group of symbols is mapped to a complex symbol, the relationship between the number of symbols h of each group and the number of modulation phases m and the number of comp...

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Abstract

The invention discloses a block-by-block detection method of an SEFDM system based on direct expansion under a low compression factor and relates to the technical field of electronics and communication. According to the invention, on the premise that the spectral efficiency is not reduced excessively; the anti-interference performance of broadband satellite communication is improved. DSSS and SEFDM are effectively combined together, the advantages of the DSSS are utilized in the detection method of the receiving end, block-by-block detection is carried out on the basis of the idea of an ML method, the complexity of a traditional algorithm is greatly reduced, and the method is suitable for a system with the bandwidth compression factor lower than 0.6.

Description

technical field [0001] The invention relates to the technical field of electronics and communication, in particular to an anti-interference transmission technology for increasing information transmission rate in the broadband satellite-to-earth communication scenario. Background technique [0002] Satellite communication, as a supplement to ground communication, plays an important role in future information transmission. Among them, broadband satellite is a very important research field at this stage. However, due to the shortcomings of satellite transmission technology itself and the limitation of complex channel conditions, satellite communication The transmission signal is likely to be subject to some intentional or unintentional interference, which will affect the transmission quality of the signal. In order to ensure a good satellite transmission effect, corresponding measures need to be taken. In satellite communication, usually in order to resist external interference,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/185H04B1/707
CPCH04B1/707H04B7/18578H04B7/18582
Inventor 贾敏刘阳李东博潘尹峻郭庆顾学迈
Owner HARBIN INST OF TECH
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