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Direct sequence spread spectrum communication signal detecting method and apparatus

A technology of direct sequence spread spectrum and signal detection, which is applied in the direction of synchronous devices, digital transmission systems, electrical components, etc., can solve the problem of small signal-to-noise ratio and achieve the effect of accurate detection

Inactive Publication Date: 2007-01-03
THE PLA INFORMATION ENG UNIV
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Problems solved by technology

[0008] The problem to be solved by the present invention is that the range of signal-to-noise ratio applicable to the existing receiver signal detection method and device is small

Method used

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  • Direct sequence spread spectrum communication signal detecting method and apparatus
  • Direct sequence spread spectrum communication signal detecting method and apparatus
  • Direct sequence spread spectrum communication signal detecting method and apparatus

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Embodiment Construction

[0036] The reason why the method for detecting antenna or radio frequency signal energy in the prior art is only applicable to a small range of signal-to-noise ratio is that this detection method does not consider the noise energy contained in the signal energy. Therefore, in the present invention, the statistical features of the valid signal and the noise signal are used simultaneously for signal detection.

[0037] The implementation condition of the present invention is that there is a pilot signal in the communication signal. In direct sequence spread spectrum communication, almost all communication systems have pilot frequency. There are generally two ways to set up pilots: time-division pilots and parallel pilots. When the time-division pilot method is used, the pilot sequence is inserted in the middle of the data sequence and does not exist all the time; while the parallel pilot method is used, the pilot sequence and the data sequence are transmitted in parallel, and t...

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Abstract

This invention discloses a signal test method for direct sequence frequency-spread communication including: computing the correlation values of received signals and local pilot signals in a test period, computing the average value and searching for the maximum value of said correlation values, if the ratio of the computed maximum value and the average value is greater than the preset effective threshold value, then the received signals are effective. This invention also discloses a signal test device, which can test effective signals accurately with fixed threshold values in a big S / N ratio sphere.

Description

technical field [0001] The invention relates to a wireless direct sequence spread spectrum communication system and a wireless direct sequence spread spectrum mobile ad hoc network system, in particular to a pilot auxiliary signal detection method and device for direct sequence spread spectrum communication. Background technique [0002] Spread spectrum communication is a method of information transmission. The frequency bandwidth occupied by the signal is much larger than the minimum bandwidth necessary for the transmitted information. The expansion of the frequency band is realized by encoding and modulating with an independent code sequence. This independent code sequence is called It is the spreading code. Spread spectrum communication has the characteristics of strong anti-interference, low bit error rate, good concealment, etc., and has a wide range of applications in practice. [0003] In direct sequence spread spectrum, the information data stream to be sent at the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04L7/00H04B1/7105
Inventor 赵雄伟胡赟鹏于宏毅张效义刘波
Owner THE PLA INFORMATION ENG UNIV
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