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Narrowband interference excisers for wideband OFDM

KAN Chun-rong, SUN Wen-qiao(Institute of Communications Engineering, PLA Univ. of Sci. & Tech., Nanjing 210007, China; No. 210 Hospital of PLA, Dalian 116021, China)  
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.
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