An interference suppression method suitable for orthogonal time frequency space modulation

Abstract

The application belongs to the technical field of OTFS modulation and demodulation, and discloses an interference suppression method suitable for orthogonal time frequency space modulation, which comprises the following steps: at the receiving end of the OTFS system, interference detection is performed on a time-frequency domain symbol matrix, and the detected interfered subcarriers are zeroed to obtain a time-frequency domain symbol matrix; after SFFT transformation to the DD domain, parallel-serial conversion, constellation demapping and channel decoding, a restored bit data sequence is obtained. The application utilizes the diffusion effect generated by SFFT transformation in the OTFS system, effectively compensates the information loss caused by zeroing of part of the time-frequency domain subcarriers, reduces the interference influence in the OTFS system, and successfully eliminates the error code platform caused by subcarrier zeroing under high signal-to-noise ratio by means of the method combining cascaded channel coding and inter-frame interleaving, and improves the error code performance, realizes wide-area interference suppression under the environment of large time delay and large Doppler frequency shift, and significantly improves the anti-interference ability of the system.

Images