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Low-correlation code set construction method based on cross-correlation matrix concentration

A technology of cross-correlation matrix and construction method, which is applied in multiplexing code types, multiplexing code generation, code division multiplexing system, etc., can solve the problem of the small number of chips in the m-sequence code set and limit the use range of Gold codes , unsatisfactory and other problems, to achieve the effect of a considerable number of chips, excellent correlation performance, and flexible values

Active Publication Date: 2017-01-11
NO 20 RES INST OF CHINA ELECTRONICS TECH GRP
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Problems solved by technology

The m-sequence is a sequence generated by a feedback shift register, and has the best self-correlation and cross-correlation performance, but the number of chips in the m-sequence code set is small, which cannot meet the needs of practical applications; Gold code and Kasami code are combined sequence codes of m-sequence , the performance of auto-correlation and cross-correlation is good, and the number of chips in the set is considerable, but the chip length can only be 2 n -1 (n is a positive integer), which limits the scope of use of Gold codes and Kasami codes

Method used

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  • Low-correlation code set construction method based on cross-correlation matrix concentration
  • Low-correlation code set construction method based on cross-correlation matrix concentration
  • Low-correlation code set construction method based on cross-correlation matrix concentration

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, and the present invention includes but not limited to the following embodiments.

[0026] The present invention proposes for the first time a method of condensing a chip set with excellent autocorrelation performance according to a cross-correlation matrix, and constructs a low-correlation code set with flexible chip length and excellent autocorrelation and cross-correlation performance as a frequency hopping The synchronization code used by different pulses in communication can effectively support multi-pulse synchronization acquisition; or it can be used as the spreading code in DS-CDMA system to effectively reduce the mutual interference between multiple users.

[0027] The present invention comprises the following steps:

[0028] (1) Traverse the entire binary code space with a length of N bits, exhaustively enumerate all equalization codes to form an...

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Abstract

The invention provides a low-correlation code set construction method based on cross-correlation matrix concentration. The method comprises the steps that a code space is traversed to form a balanced code set; codes with the excellent self-correlation property are found out, and an excellent self-correlation code set is formed; cyclically equivalent codes are removed from the excellent self-correlation code set, and an alternative code set is formed; pairwise cross-correlation value vectors of all the codes are calculated, and peak values of the pairwise cross-correlation value vectors are selected to form a cross-correlation matrix; the cross-correlation matrix is converted into a cross-correlation 01 matrix and concentrated into a full 1 matrix; the codes corresponding to the full 1 matrix form an optimum code set, the alternative codes which have good cross-correlation with all the codes in the optimum code set are added, and the low-correlation code set is formed. According to the method, the low-correlation code set in which the codes are flexible in length range and excellent in correlation property is generated, and the code number in the set is considerable.

Description

technical field [0001] The invention relates to the technical fields of frequency hopping (FH) communication and direct sequence spread spectrum code division multiple access (DS-CDMA), and is used for constructing a low-correlation code set. Background technique [0002] In frequency hopping communication, a frame message contains multiple pulses of different frequencies. When synchronously capturing the message frame, the local synchronization code modulation signal is used to perform sliding correlation calculations with the received signal. When the synchronization code in the received signal is aligned with the local synchronization code, a sharp correlation peak appears, and the synchronization position is determined according to this correlation peak. , thus completing the synchronous capture. In practical applications, different synchronization codes are generally used in multiple pulses, and the correlation values ​​of multiple synchronization codes are superimpose...

Claims

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Application Information

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IPC IPC(8): H04B1/707H04B1/713H04J13/00H04J13/10
CPCH04B1/707H04B1/713H04J13/0007H04J13/10
Inventor 万佳君李国梁李峰刘飞段鹏岳鹏
Owner NO 20 RES INST OF CHINA ELECTRONICS TECH GRP
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