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GMSK channel interference detection method

A technology of channel interference and detection method, applied in transmission monitoring, electrical components, transmission systems, etc.

Inactive Publication Date: 2018-10-09
CHENGDU UNIV OF INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Combining the above four interference detection technologies, there is a contradiction between the interference detection capability and the computational complexity and implementation cost

Method used

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Experimental program
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specific Embodiment 1

[0113] The specific embodiment 1 is realized by MATLAB program to evaluate the performance of the algorithm. In a specific embodiment one, the bandwidth symbol time product BT=0.3 of the GMSK Gaussian filter, and the symbol rate F b =270.8K, which is the GMSK parameter in the GSM and GSM-R systems. The signal sampling rate F generated by MATLAB simulation s Set to 437.5KHz to reduce computational overhead. Each data sequence has 1024 sampling points.

[0114] S1, at the sampling rate F s In the case of 437.5KHz, the noise-free GMSK signal modulated by random data is used, and the statistics of its instantaneous frequency distribution can be obtained as F high =67Khz,F low ≈22KHz.

[0115] S2. Learning of feature parameter calculation interval and symmetry error threshold:

[0116] S21. According to the SNR-BER (bit error rate) relationship of the GSM signal, the SNR range of the signal used for learning is set to 6-40dB. For the convenience of display, it is divided int...

specific Embodiment 2

[0138] The second specific embodiment uses a general-purpose spectrum monitoring receiver for GSM and GSM-R channel interference assessment in the spectrum monitoring system. In specific embodiment two, the bandwidth symbol time product BT=0.3 of GMSK Gaussian filter, symbol rate F b =270.8K. Each data sequence has 1024 sampling points. Considering the stray and noise of the receiver itself, set the CNR threshold of data acquisition as 6dB, and regard CNR as SNR. At channel sampling rate F s In the case of 437.5KHz, the noise-free GMSK signal modulated by random data is used, and the statistics of its instantaneous frequency distribution can be obtained as F high =67Khz,F low ≈22KHz.

[0139] S5. Set receiver sampling rate F r =1750KHz, the data length is 4096 sampling points, at this moment, the baseband signal bandwidth is 1750KHz, and the data of 8 GSM channels can be collected simultaneously; the data sequence collected is carried out discrete Fourier transform (DFT)...

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Abstract

The invention provides a GMSK channel interference detection method. For the problems of co-frequency and adjacent-frequency interference detection in a GMSK channel, the special instantaneous frequency histogram distribution characteristics of GMSK modulation are used, a characteristic calculation interval and a characteristics threshold are obtained through learning and training, and an interference classifier based on characteristic parameters is established. In actual working, the special instantaneous frequency histogram distribution characteristics and the threshold are classified and determined by the interference classifier, and whether there is interference in the channel is detected. The method has a high detection probability for interference with unapparent spectrum characteristics and time domain amplitude characteristics in the GMSK channel and has the advantages of low computational complexity and low implementation cost.

Description

technical field [0001] The invention belongs to the field of wireless communication, relates to GMSK (Gaussian Minimum Shift Keying, Gaussian Minimum Shift Keying) channel statistical feature parameter definition, statistical feature parameter learning, interference classifier definition and training, and interference detection technology, and specifically relates to the use of instantaneous A method for detecting GMSK channel interference by frequency distribution characteristics. Background technique [0002] With the deployment of a large number of radio wave transmitting equipment, the probability of interference in the communication channel is also increasing. Generally speaking, the causes of radio interference mainly include intermodulation products between signals, higher harmonics of signals, power leakage of adjacent channel signals, unauthorized radio stations, lightning, and electromagnetic radiation generated by electronic and electrical equipment. Interference...

Claims

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Application Information

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IPC IPC(8): H04B17/345
CPCH04B17/345
Inventor 杜鸿文成玉李文藻
Owner CHENGDU UNIV OF INFORMATION TECH
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