OFDM system fast-change channel estimation method based on double weighing

Abstract

The invention provides an OFDM system fast-change channel estimation method based on double weighing. The method includes the following steps that pilot signals are extracted from receiving data of a system, and the channel response at a pilot frequency position is estimated; for each pilot frequency sub-carrier, a predicated value of the channel response at the data position of the corresponding pilot frequency sub-carrier is obtained through forward prediction; the predicted values of the channel responses are used for conducting balance and judgment on the received data, feedback information is obtained, the predicted values of the channel responses are corrected, and the channel responses of the whole pilot frequency sub-carriers are obtained; the channel response of each pilot frequency sub-carrier is used for conducting balance and judgment on the receive data, and error parameters of the channel response of each pilot frequency sub-carrier are obtained; interpolation coefficients of each pilot frequency sub-carrier are calculated according to the error parameters, interpolation in the frequency direction is performed, and the channel response of the system is obtained. According to the OFDM system fast-change channel estimation method based on double weighing, effective tracking of a fast time-varying channel can be achieved, and the accuracy of channel estimation is improved.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a double-weighted OFDM system fast-changing channel estimation method. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) technology has the advantages of high data transmission rate, strong anti-multipath interference ability, easy realization of multiple access and flexible resource allocation, etc., and has been written into WiMAX (Worldwide Interoperability for Microwave Access), LTE (Long Term Evolution) and other standards are the core technologies of the physical layer of future wireless communications. Channel estimation is one of the key technologies in OFDM systems, and the quality of channel estimation has a great impact on system performance. [0003] At present, channel estimation methods for OFDM systems can be roughly divided into two categories: blind channel estimation and pilot-assisted channel estimation. The blind channel ...

AI Technical Summary

Problems solved by technology

This method does not require statistical information of the channel, is simple to implement, and has a small amount of calculation, but the estimation accuracy is not high.

This is because the channel information at the pilot position is used as a reference for interpolation. If the estimation result at the pilot position is inaccurate, the estimation error at the pilot position will spread to the data position along with the interpolation, r...

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