High data rate direct sequence spread spectrum coding and decoding method

A technology of direct sequence spread spectrum, coding and decoding method, applied in the field of communication, can solve the problems of reducing the information transmission rate and increasing the anti-interference ability, and achieve the effect of increasing the information transmission rate and the information transmission rate.

Inactive Publication Date: 2016-03-16
NO 27 RES INST CHINA ELECTRONICS TECH GRP
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Problems solved by technology

However, the price of increasing the anti-interference ability is the reduction of the information transmission rate. The longer the pseudo code, the more the information transmission rate is reduced.
For example, for a communicati

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  • High data rate direct sequence spread spectrum coding and decoding method
  • High data rate direct sequence spread spectrum coding and decoding method
  • High data rate direct sequence spread spectrum coding and decoding method

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[0019] Such as figure 1 , figure 2 and image 3 As shown, the present invention comprises a kind of high data rate direct sequence spread spectrum codec method, and described coding method comprises:

[0020] First use the information value that needs to be transmitted as the initial value of the n-level linear feedback shift register that generates the pseudo code; at least two m-sequence codes are generated by the n-level linear feedback shift register, and the m-sequence code is used as a pseudo-random code sequence; the present invention The length of the n-level m-sequence code is N=2 n -1. For example, the 31-bit m-sequence code can be generated by a 5-stage linear feedback shift register, at this time n=5, N=2 n -1=31.

[0021] The initial value of the linear feedback shift register is different, and the generated m-sequence codes are also different. Therefore, the information to be sent can be used as the initial value of the linear feedback shift register, so th...

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Abstract

The invention discloses a high data rate direct sequence spread spectrum coding and decoding method. The coding method comprises steps that, firstly, a to-be-transmitted information value is taken as an initial value of an n-level linear feedback shift register generating PN codes; at least two m sequence codes generated by the n-level linear feedback shift register are taken as a pseudo random coding sequence; a synchronization code +information code data frame structure is employed for coding; during decoding, a sliding correlation method is employed to search a correlation peak of a synchronization sequence, after an address of the synchronization sequence with the correlation peak having the largest absolute value is acquired, an initial address of an information sequence starts, correlation operation is carried out through selecting one complete information sequence, the carried information value can be calculated according to an address of the information sequence with a correlation peak having the largest absolute value, and decoding is finished. Through the method, m-sequence n-bit information carrying is realized, under the condition of the same transmission bandwidth, the information transmission rate is enhanced by about 0.9n times.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a high data rate direct sequence spread spectrum encoding and decoding method. Background technique [0002] At present, direct sequence spread spectrum coding technology has been widely used in the field of communication, mainly used to improve the anti-interference ability of the signal. The principle is to use a set of code length 2 n The pseudo-random sequence code of -1 (usually m-sequence code or GOLD code, n is the number of bits of the linear feedback shift register required to generate the sequence or the pseudo-code power) expands the original digital information bit by bit, and every 1 bit corresponds to a 2 n -1-bit pseudo-random sequence code. The specific operation is to XOR each information bit with the pseudo-random sequence code to complete the extension of the information bit. [0003] The extended spread spectrum coding rate is 2 of the original info...

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Application Information

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IPC IPC(8): H04B1/7073H04B1/7075H04B1/7097
CPCH04B1/7073H04B1/7075H04B1/7097
Inventor 邢建泉郜两利
Owner NO 27 RES INST CHINA ELECTRONICS TECH GRP
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