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OFDM系統中的窄帶干擾抑制
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Narrowband Interference Suppression in OFDM System
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    摘要:

    正交頻分復用(Orthogonal Frequency Division Multiplexing, OFDM)技術(shù)由于其對頻譜的利用率高、抵抗多徑的能力好等優(yōu)勢,已經(jīng)成為了最常用的多載波傳輸方案。但是OFDM系統易受窄帶干擾的影響,導致其系統誤碼率顯著(zhù)上升。針對這一缺點(diǎn),提出了一種有效的窄帶干擾消除算法。在頻域對窄帶干擾的參數進(jìn)行高精度估計并根據估計的參數重建干擾,從而實(shí)現對干擾的準確消除。采用了最大似然估計法結合零填充插值法進(jìn)行初步估計,避免了由于頻譜泄漏導致的誤判。利用初步估計出的頻率變換接收信號的頻率,應用加權相位平均算法來(lái)獲得干擾頻率的精確估計。利用仿真平臺進(jìn)行仿真建模,測試了不同干擾強度下系統的誤碼率性能。實(shí)驗表明所提算法可以有效提升系統誤碼率性能,且受干擾強度影響不大。

    Abstract:

    Orthogonal Frequency Division Multiplexing (OFDM) has become one of the most widely used multi carrier transmission schemes because of its advantages of high spectrum utilization, strong anti-multipath ability and low complexity. However, the OFDM system is vulnerable to narrowband interference, resulting in a significant reduction in Bit Error Rate (BER) performance. To solve this problem, an effective narrowband interference cancellation algorithm is proposed. By estimating and reconstructing the narrowband interference in frequency domain, the interference can be eliminated accurately. The Maximum Likelihood (ML) estimation method combined with zero fill interpolation method is used for preliminary estimation to avoid misjudgment caused by spectrum leakage. The frequency of the received signal is transformed by using the initial estimated frequency, the Weighted Phase Averaging (WPA) algorithm is applied to obtain the accurate estimation of the interference frequency. The simulation platform is used for simulation modeling, and the BER performance of the system under different jamming intensity is tested. Experiments show that the proposed algorithm can effectively improve the BER performance of the system, and is not affected by the interference intensity.

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馬千里,肖卓,宋志群. OFDM系統中的窄帶干擾抑制計算機測量與控制[J].,2018,26(10):150-154.

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歷史
  • 收稿日期:2018-07-12
  • 最后修改日期:2018-08-08
  • 錄用日期:2018-08-08
  • 在線(xiàn)發(fā)布日期: 2018-10-16
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