Method and system for wireless channel measurement based on wavelet decomposition threshold de-nosing

A wavelet decomposition and wireless channel technology, applied in transmission monitoring, electrical components, transmission systems, etc., can solve problems such as impulse response errors

Inactive Publication Date: 2012-07-18
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0007] To sum up, traditional wireless channel measurement ignores the interference introduced by noise and sliding correlation, which causes a certain error between the measurement result and the actual channel impulse response, and this error has a negative effect on the subsequent channel parameter extraction and channel modeling. varying degrees of influence

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  • Method and system for wireless channel measurement based on wavelet decomposition threshold de-nosing
  • Method and system for wireless channel measurement based on wavelet decomposition threshold de-nosing

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[0029] The present invention provides a method and a device for wireless channel measurement based on wavelet decomposition threshold denoising, which are applied to wireless channel measurement, reduce the interference of noise on channel impulse response, improve the accuracy and validity of channel measurement results, and provide the basis for follow-up The study of channel characteristics provides a reliable data basis.

[0030] The present invention will be described in detail below with reference to the accompanying drawings.

[0031] like figure 1 As shown, the PN sequence generator at the transmitting end generates a pseudo-random sequence code with a fixed code length and code rate required for the measurement, and then undergoes BPSK modulation, up-conversion to the measurement frequency and transmits; the receiving end and the transmitting end complete the clock synchronization, and receive the signal After down-conversion and filtering, it is converted into an in...

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Abstract

The invention discloses a method and a system for wireless channel measurement based on wavelet decomposition threshold de-nosing. The method includes the following steps: (1) using a spread spectrum sliding correlation method to finish wireless channel measurement so as to obtain channel impulse response containing noise, (2) conducting multi-resolution wavelet decomposition for the channel impulse response and leading the channel impulse response to be converted from time domain to wavelet domain, (3) reasonably selecting a threshold function and a threshold and processing wavelet coefficients corresponding to the noise according to the threshold function; (4) conducting wavelet reconstruction and leading the de-noised channel impulse response to be converted from the wavelet domain back to the time domain, and (5) storing the de-noised channel impulse response for researching channel characteristics. Through steps of wavelet decomposition, threshold de-nosing, wavelet reconstruction and the like, the method and the system can reduce interference on the channel impulse response caused by the noise, improve accuracy and effectiveness of channel measurement results, and provide reliable data basis for follow-up researching of channel characteristics.

Description

technical field [0001] The present invention relates to the field of wireless mobile communication, in particular to a method and device for wireless channel measurement based on wavelet decomposition threshold denoising. Background technique [0002] Wireless channel is a key factor affecting the performance of wireless mobile communication system. The characteristics of wireless channels in space-time correlation, frequency selectivity and many other aspects pose challenges to the design of mobile communication systems. Therefore, the study of wireless channel propagation characteristics is the premise and key to the study of new mobile communication technologies. [0003] The best way to understand the real channel characteristics is to measure the wireless channel in various actual geographical environments, and it is widely used by countries all over the world. Commonly used wireless channel measurement methods include direct pulse measurement, frequency domain channe...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/00H04B17/345
Inventor 赵敏武穆清于得水贾贵源徐春秀郭起霖胡骞郭嵩王婷婷贺媛郑倩倩邹鹏张殿宝张皎
Owner BEIJING UNIV OF POSTS & TELECOMM
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