A Channel Estimation Method Based on Complete Interference Cancellation

Abstract

The invention discloses a channel estimation method based on complete interference elimination, and belongs to the field of filter bank multi-carrier communication. The method comprises the followingsteps: inserting a sparse block pilot symbol into a to-be-sent sub-frame header, and inserting a column of zero guard intervals into the front and back moment positions of the pilot symbol; calculating the total imaginary part interference on the pilot symbol; respectively inserting designed auxiliary symbols at the front and back moment positions of the subcarrier where the pilot symbol is located; sending and receiving a pilot symbol and an auxiliary symbol of a frame header and a data symbol in a frame by adopting an OQAM / FBMC; and obtaining a channel frequency response of a subcarrier where the pilot symbol is located based on a least square criterion, and obtaining an estimated value of an actual channel through Fourier transform. According to the method, the additional auxiliary symbol is inserted into the zero guard interval of the sparse block pilot, so that the imaginary part interference of the data symbol to the pilot symbol is effectively offset, and the channel estimationperformance can be effectively improved under the condition of not changing the structure of the receiver.

Description

technical field [0001] The invention belongs to the field of filter bank multi-carrier communication, and more specifically relates to a channel estimation method based on complete interference elimination. Background technique [0002] The traditional Orthogonal Frequency Division Multiplexing (OFDM) system uses a rectangular window in the time domain, which leads to problems such as high side lobes in the frequency domain, sensitivity to frequency offset, and strict requirements on synchronization. In contrast, Filter Bank Multicarrier with Offset Quadrature Amplitude Modulation (OQAM / FBMC) uses a prototype filter with very low spectral sidelobes, and the out-of-band leakage of the transmitted signal is very weak . At the same time, the user signals of the OQAM / FBMC system do not need to maintain strict synchronization and orthogonality in the entire network, which greatly reduces the synchronization overhead and access delay of the system, and also makes the system desig...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defects of the prior art, the purpose of the present invention is to provide a sparse block pilot design method based on complete interference cancellation, aiming at solving the problem that the existing pilot design method does not consider the imaginary part generated by the data symbol to the pilot symbol interference, which leads to the problem of low channel estimation performance

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