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A low-complexity adaptive co-channel interference removal scheme for COFDM systems

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3 Author(s)
Xiaoxin Zhang ; State Key Lab. of Adv. Opt. Commun. Syst. & Networks, Peking Univ., Beijing, China ; Hongbo Guo ; Yuping Zhao

Coded orthogonal frequency division multiplexing (COFDM) broadband systems may coexist with other wireless systems and suffer from co-channel interferece (CCI). CCI severely affects soft decision decoding and degrades the performance of COFDM systems. In this paper, we propose a novel CCI removal scheme which is adaptive and low in implementation cost. The proposed scheme has three important features: 1) It can detect the pilots affected by CCI and amend the incorrect channel frequency responses (CFRs); 2) It calculates soft decisions by only using the amended CFRs; 3) It can detect the soft decisions affected by CCI and erase them. We compare the proposed scheme with the conventional one presented in [1]. Simulation results indicate that the proposed scheme eliminates CCI more effectively than the conventional one. Moreover, the proposed scheme requires lower computation complexity and memory

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Consumer Electronics, IEEE Transactions on  (Volume:56 ,  Issue: 2 )