短波寬帶OFDM的相對(duì)門限干擾消除器
A Relative Threshold Exciser of Narrowband Interference for Wideband OFDM in HF Communications
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摘要: 短波寬帶OFDM系統(tǒng)極容易受到擁擠頻段上的窄帶干擾，低信噪比工作條件下可能帶來(lái)性能的急劇惡化。該文在Nilsson的寬帶OFDM系統(tǒng)基礎(chǔ)上設(shè)計(jì)了一種適合短波多徑信道的相對(duì)門限干擾消除器。分析了低信噪比下相對(duì)門限的選取和噪聲功率的估計(jì)問(wèn)題，并對(duì)信道補(bǔ)償做了改進(jìn)，以減小噪聲干擾。理論分析和仿真表明，低信噪比下，這種門限干擾消除器可以使系統(tǒng)在有干擾的條件下性能接近于理想干擾消除器的性能。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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