摘要
短波宽带OFDM系统极易受到拥挤频段上的窄带干扰。基于Nillsson的宽带OFDM系统,设计了衰落信道低信噪比条件下的窄带干扰消除器。分析了低信噪比时门限的选取和噪声功率的估计问题,提出了自适应门限干扰消除器和部分子带消除器。仿真表明,多径低信噪比条件下,提出的自适应门限干扰消除器能有效抑制窄带干扰,部分子带消除器对窄带干扰消除性能更好。
Wideband OFDM communications were easily interfered by narrowband signals. Based on Nilsson＇s wideband OFDM system, narrowband interference excisers were designed here. The choice of threshold and the power estimation of noise were investigated under low SNR. Then, adaptive threshold interference excisers and segment sub-carrier excisers were proposed. Simulations show that in fading HF channels the performance of the system with adaptive threshold interference exciser can efficiently reduce the attenuation caused by narrow-band interference. The segment sub-carrier excisers have lower BER than others.
出处
《解放军理工大学学报（自然科学版）》
EI
2006年第1期11-15,共5页
Journal of PLA University of Science and Technology(Natural Science Edition)
关键词
正交频分复用
窄带干扰消除器
M序列
低信噪比
OFDM （orthogonal frequency division multiplexing）
narrowband interference exciser
m sequence
low signal noise ratio
