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Direct sequence spread spectrum signal chip width estimation method

A technology of signal code and width, which is applied in the estimation of chip width of direct spread signal and estimation of chip width of direct spread signal, can solve the problems of low estimation accuracy, performance degradation, low signal-to-noise ratio, etc. The effect of slow calculation speed and low signal-to-noise ratio lower limit

Active Publication Date: 2016-11-09
SOUTHEAST UNIV
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Problems solved by technology

[0003] The main features of the existing DS signal chip width estimation methods are as follows: 1. The method based on the zero point of the power spectrum uses the corresponding relationship between the left and right zero point intervals of the power spectrum of the DS signal and the reciprocal of the chip width to estimate, and the estimation accuracy of the zero point position of the power spectrum is relatively low. The problem of severe performance degradation under low and low SNR; 2 The method based on periodic spectrum estimation requires a large amount of calculation, and multiple accumulations are used to improve the estimation accuracy and adapt to low SNR

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  • Direct sequence spread spectrum signal chip width estimation method
  • Direct sequence spread spectrum signal chip width estimation method
  • Direct sequence spread spectrum signal chip width estimation method

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Embodiment 1

[0044] The simulation signal parameters are: sampling frequency f s =50KHz, carrier frequency f 0 = 5.0kHz, the order of the pseudo-code is 5, the two-phase modulation method is adopted, the number of carrier cycles in one chip is 8, the chip width is 1.6ms, the number of discrete sampling points is 80 points, and the signal amplitude is A 0 = 1, superimposed zero-mean Gaussian white noise, variance σ 2 The size of is determined by the signal-to-noise ratio SNR:

[0045] figure 2 and image 3are the results of sorting the zero-crossing intervals of the baseband signal from small to large under the conditions of no noise and -5dB SNR respectively. From figure 2 It can be seen that after the zero-crossing intervals are sorted from small to large, the occurrence probability of zero-crossing intervals obeys the pseudo-code run-length distribution characteristics, and the interval with a sampling length of 80 has the highest probability of occurrence. According to the maxi...

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Abstract

The invention discloses a direct sequence spread spectrum signal chip width estimation method. The run distribution characteristic of a pseudo code of a direct sequence spread spectrum signal, i.e., a run with a length of 1 has the highest probability of occurrence, the pseudo code with the length of 1 corresponds to one chip of the direct sequence spread spectrum signal, and by searching intervals of zero crossing points of baseband signals with the highest probability of occurrence, estimation on a width of the chip is obtained. The method disclosed by the invention improves chip width estimation accuracy, is suitable for the condition of a low signal-to-noise ratio, has a low computation burden, and has high practical application value.

Description

technical field [0001] The invention belongs to the technical field of communication and signal processing, and relates to a method for estimating the chip width of a direct-spread signal, which is used for estimating the chip width of a direct-spread signal under a non-cooperative condition. Background technique [0002] Direct sequence spread spectrum (hereinafter referred to as direct spread) technology has been widely used in the field of underwater acoustic communication and detection. It is characterized in that the signal frequency band is broadened for transmission through pseudo-random sequences, and the receiving end obtains spreading gain through despreading processing. For non-cooperative parties, the signal-to-noise ratio per unit frequency of direct spread signals is low, and its interception detection and parameter estimation technologies are research hotspots and difficulties in communication and underwater acoustic countermeasures. Chip width estimation of D...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04L25/02
CPCH04B1/707H04L25/022H04L25/0222
Inventor 王晓燕方世良李帝水姚帅
Owner SOUTHEAST UNIV
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