短波宽带OFDM的相对门限干扰消除器
A Relative Threshold Exciser of Narrowband Interference for Wideband OFDM in HF Communications
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摘要: 短波宽带OFDM系统极容易受到拥挤频段上的窄带干扰，低信噪比工作条件下可能带来性能的急剧恶化。该文在Nilsson的宽带OFDM系统基础上设计了一种适合短波多径信道的相对门限干扰消除器。分析了低信噪比下相对门限的选取和噪声功率的估计问题，并对信道补偿做了改进，以减小噪声干扰。理论分析和仿真表明，低信噪比下，这种门限干扰消除器可以使系统在有干扰的条件下性能接近于理想干扰消除器的性能。Abstract: Wideband OFDM communications are easily been interfered by narrowband signal. The attenuation is worse in low SNR. Based on Nilssons wideband OFDM system, a relative threshold exciser for narrowband interference is designed here. The choice of relative threshold and the power estimation of noise are investigated under low SNR. To reduce noise interference, the method of channel compensation is modified for noisy environment. Theoretic analysis and simulations show the performance of the system with this relative threshold exciser can keep up with the ideal interference exciser in HF communications under low SNR.
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Nilsson J E M.[J].Giles T C. Wideband multi-carrier transmission for military HF communication [C]. Proc. Milcom97, Monterey, U.S.A.1997,:-[2]Nilsson R, Sjoberg F, LeBlanc J P. A narrow-band interference canceller for OFDM-based systems [C]. EPMCC01, Vienna, Austria, 2001: 1.8.[3]Hsiao H F, Hsieh M H, Wei C H. Narrow-band rejection in OFDM-CDMA transmission system [C]. ISCAS '98 Monterey, USA 1998: 437.440.[4]Schmidt K U, Ertel J, Benedix M, et al.. Subcarrier exclusion techniques for coded OFDM[C]. 8th International OFDM Workshop 2003, InOWo Germany, 2003: 24.25.[5]Theodore S. Rappaport, Wireless communications principles practice[M]. Prentice-Hall, Inc. 1996: 176.185. -
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