关键词: OFDM, 窄带干扰, 干扰抑制系统, 干扰重构

Abstract:

OFDM system takes advantage of the orthogonal sub-carriers and makes full use of spectrum resources,but may affect more subcarriers and lead to a serious deterioration in the status of the system BER performance due to narrow-band interference.This paper proposes an OFDM system narrowband interference cancellation technique.Disturbed subcarriers are detected at the receiving end using a feedback channel to inform the transmitting side,and the information of the interfered sub-carriers without modulation at the transmitting end are sent to the channel.These carriers are limited only by the influence of the interference signal,and are reconstructed and stored at the receiving end,thereby removing the interference to ensure the normal communication.Simulation and analysis results show that the method can effectively inhibit the narrowband interference of OFDM system without wasting spectrum resources.

Key words: OFDM;narrowband interference;interference suppression system;interference reconstruction