Method for detecting interference of OFDM communication system

Abstract

The invention provides a method for detecting the interference of an OFDM communication system, belonging to the technical field of communication technology. The method comprises the following steps of: setting an interference detecting threshold by extracting sonband data with minimum error rate on the basis of the statistics of a sonband error rate; intercepting and receiving adjoining Q frames in the data; and comparing data which is obtained by adding and averaging corresponding frequency points after sectioning, windowing and /FFT/ with an interference detecting threshold TH to finally obtain an interference detecting result. The method belongs to a self-adapting blind interference detecting method. The method has the characteristics of high detection accuracy and low omission ratio, does not need to estimate information channel, reduces the complexity of a whole OFDM communication system, and can set the interference detecting threshold without a pilot frequency signal, thereby improving the use ratio of frequency spectrum resource of the OFDM communication system.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to an interference detection method of an Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) communication system. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) technology is a special multi-carrier transmission scheme, which can be regarded as a modulation technology or a multiplexing technology, with high data transmission rate, The advantages of strong anti-multipath interference ability and high spectrum efficiency have attracted more and more attention. It has been widely used in digital audio broadcasting (DAB), digital video broadcasting (DVB), wireless local area network (WLAN) and other fields. OFDM technology can provide flexible spectrum resource allocation for the system while providing broadband access. Be the best technique for interfer...

AI Technical Summary

Problems solved by technology

This type of method has a simple algorithm and is easy to implement; however, various existing interference detection methods based on noise power decode the noise received signal of the entire working frequency band, and use the average noise power of the entire working frequency band to determine the interference detection threshold

Due to the unscientific and reasonable interference detection threshold determined by this type of method, the accuracy of interference detection results is poor

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