Pseudo-random code estimation method for direct-spread signal with long-period code

A direct-spread signal and pseudo-random code technology, which is applied in the field of blind parameter estimation, can solve problems such as the inability to estimate periodic long-code direct-spread signals, and achieve the effect of eliminating influence and improving accuracy

Active Publication Date: 2016-08-24
浙江知多多网络科技有限公司
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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the pseudo-random code of the periodic long-code direct-spread signal cannot be blindly estimated in non-cooperative communication, and proposes a method for estimating the pseudo-random code of the periodic long-code direct-spread signal based on the common peak of the m-sequence third-order correlation function , so as to solve the problem that the two PN codes of the period long code direct spread signal cannot be estimated

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  • Pseudo-random code estimation method for direct-spread signal with long-period code
  • Pseudo-random code estimation method for direct-spread signal with long-period code
  • Pseudo-random code estimation method for direct-spread signal with long-period code

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[0020] The implementation steps of the present invention will be further described in detail below.

[0021] Step 1, when the method for estimating the pseudo-random code of the periodic long code direct spread signal of the present invention is in use, first the received periodic long code direct spread signal is sampled at the chip rate of the spreading code, and then converted into the baseband signal r(n):

[0022] r(n)=Ad(n)b(n)c(n)+w(n) (1)

[0023] Among them, n is the sampling moment, n=0,1,2,...,L-1; A is the signal amplitude; d(n) is the information code sequence; b(n) is the spreading sequence of period M, c(n ) is a long scrambling code sequence with period K, b(n) and c(n) both use m sequence and K>>M; w(n) is additive Gaussian white noise; L is the signal length.

[0024] Delay the baseband signal by one spreading code chip and multiply it with the original baseband signal to get r1(n):

[0025] r 1 (n)=r(n)r(n+1) (2)

[0026] Since the third-order correlatio...

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Abstract

The invention relates to a pseudo-random code estimation algorithm of a period long code direct spread signal. At present, the pseudo-random code estimation technology of direct spread signal cannot be applied to the period long code direct spread signal with short code spreading and long code scrambling. The method of the present invention is as follows: firstly calculate the delayed third-order correlation function of the periodic long code direct spread signal; then search for possible common peak coordinates; and then use the common peak coordinates to obtain several groups of long code and short code m-sequence primitive polynomials to be selected Combination; finally check the candidate combination to obtain the m-sequence estimation of the signal long code and short code. The present invention makes full use of the principle that the factors of the greatest common formula of the polynomial corresponding to the common peak of the third-order correlation function of the two m-sequences include the principle of the two m-sequence primitive polynomials at the same time, and realizes two Simultaneous estimation of pseudorandom codes.

Description

technical field [0001] The invention belongs to the field of blind parameter estimation of direct sequence spread spectrum signals, in particular to a method for estimating pseudo-random codes of periodic long code direct spread signals using short code spread spectrum and long code scrambling. Background technique [0002] Conventional communication systems mainly use limited signal power and bandwidth to transmit as much information as possible. Spread spectrum communication is a communication in which data is transmitted on a bandwidth much larger than the information rate. Because it does not aim at saving bandwidth, it is different from conventional communication systems. [0003] Direct Sequence Spread Spectrum (DSSS) communication technology is one of the main methods of spread spectrum communication technology. Direct spread signals can be divided into short code direct spread signals and long code direct spread signals. Wherein, the long code direct spread signal ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/707
Inventor 赵知劲顾骁炜沈雷尚俊娜胡伟康李淼王海泉徐春云
Owner 浙江知多多网络科技有限公司
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