一种OFDM系统强窄带干扰消除方法

OFDM系统由于具有子载波的正交性从而可以充分利用频谱资源,鉴于当OFDM受到窄带干扰而影响较多的子载波时,会出现系统误码率性能严重恶化的现状。文中提出了一种OFDM系统窄带干扰消除技术,该技术在接收端检测出受干扰子载波,利用反馈信道告知发送端,并在发送端将受干扰的子载波不加调制的信息发送到信道中,而在信道中该部分子载波只受干扰信号的影响,接收端将干扰信息重构并储存,从而完成干扰消除确保正常通信。仿真和分析结果表明,该方法在不浪费频谱资源的情况下,能有效抑制OFDM系统的窄带干扰。

A Novel Narrowband Interference Cancellation Technique for OFDM System

OFDM system takes advantage of the orthogonal sub-carriers and makes full use of spectrum re- sources, but may affect more subcarriers and lead to a serious deterioration in the status of the system BER perform- ance 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 transmit- ting 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 spec- trum resources.