Blind channel estimation method based on cyclostationarity of OFDM signals

Abstract

The invention discloses a blind channel estimation method based on the cyclostationarity of OFDM signals, which has the advantages that the two methods are used for analyzing the z transformation of the time delay variable Tau in the periodic spectral function of OFDM-received signals based on one fixed cycle frequency and realizing the accurate estimation of the channel information through selecting two different related values of the z transformation of the delay variable Tau, finally using the information containing the channel amplitude and the minimum phase and combining the current least square method. The two methods only use the spectral information of one cycle frequency, so that the number of the cycle frequencies is reduced and the spectral resource utilization rate is effectively improved, thereby improving the accuracy of the channel estimation. By the emulation verification, the performance of the method is obviously superior to that of the traditional blind channel estimation method.

Description

Technical field [0001] The present invention relates to a channel estimation method, in particular to a blind channel estimation method based on the cyclostationary characteristics of an OFDM signal. Background technique [0002] With the advent of the post-3G era, the Orthogonal Frequency Divided Multiplexing (OFDM) system as its key technology has attracted great attention due to its advantages of low cost and high frequency band utilization and has become the current wireless communication Research hotspots in the world. Orthogonal frequency division multiplexing system is a high-speed serial data stream, through serial-parallel conversion to form a low-speed sub-data stream, and then modulated on multiple parallel orthogonal sub-carriers to form multiple low-rate symbols, and finally distributed to Several sub-channels constitute a parallel transmission transmission system. For traditional frequency division multiplexing (FDM) systems, a guard interval needs to be added bet...

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Problems solved by technology

[0010] The above double k method selects two non-zero cyclic frequencies to construct the periodic spectral function of the received signal at each cyclic frequency, and uses the two periodic spectral functions to estimate the phase and amplitude information of the channel, which effectively improves the accuracy of channel estimation. However, this method needs to use two cyclic frequencies to estimate the channel, which greatly reduces the utilization of spectrum resources and reduces the estimation performance of the system.

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