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首页> 外文期刊>International journal of communication systems >Reducing ICI effect in OFDM system using low-complexity Kalman filter based on comb-type pilots arrangement
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Reducing ICI effect in OFDM system using low-complexity Kalman filter based on comb-type pilots arrangement

机译：使用基于梳型导频排列的低复杂度卡尔曼滤波器降低OFDM系统中的ICI效应

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摘要

In OFDM systems, time-varying channels destroy orthogonality between subcarriers causing Inter-Carrier Interference. To reduce this effect, a Kalman filter, as a benchmark, is used for channel estimation, based on comb-type pilot arrangements of the OFDM system. An advantage of comb-type pilot arrangements in channel estimation is the ability to track the variation of the channel caused by Doppler frequency. Kalman method has been proposed to estimate the channel frequency response (CFR) at the pilot locations, then CFR, at data subchannels, is obtained by means of interpolation between estimates at pilot locations. The low-complexity Kalman method is introduced to reduce the complexity of the system while achieving the same BER/SNR. Different types of interpolations have been also compared such as Low-pass, Spline-cubic and Linear interpolation methods. The BER/SNR performance of BPSK modulation schemes are considered for time varying Rayleigh fading channels. Our results has shown that the low-complexity Kalman estimation, used with the pilot arrangement and a suitable interpolation method, gives almost the same performance as that of the Kalman method specially for low SNR values and hence the effect of Doppler shift effect is controlled.
机译：在OFDM系统中，时变信道破坏子载波之间的正交性，从而引起载波间干扰。为了减小这种影响，基于OFDM系统的梳型导频布置，将卡尔曼滤波器作为基准来用于信道估计。梳状导频布置在信道估计中的优点是能够跟踪由多普勒频率引起的信道变化。已经提出了卡尔曼方法来估计导频位置处的信道频率响应（CFR），然后借助于导频位置处的估计之间的内插来获得数据子信道处的CFR。引入了低复杂度的卡尔曼方法，以降低系统的复杂度，同时实现相同的BER / SNR。还比较了不同类型的插值，例如低通，样条三次和线性插值方法。对于时变瑞利衰落信道，考虑了BPSK调制方案的BER / SNR性能。我们的结果表明，与导频安排和合适的插值方法一起使用的低复杂度卡尔曼估计，其性能几乎与针对低SNR值的卡尔曼方法的性能几乎相同，因此可以控制多普勒频移效应的影响。

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