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ICI SELF CANCELLATION TECHNIQUES IN OFDM SYSTEM

机译:OFDM系统中的ICI自取消技术

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摘要

Orthogonal frequency division multiplexing (OFDM) system is very sensitive to carrier frequency offset. The performance of the OFDM system degrades due to this frequency offset caused by frequency mismatch between the transmitter and the receiver, and Doppler shift. The frequency offset results in the introduction of ICI in the OFDM system. In this paper, we analyze ICI self cancellation techniques to reduce the effect of ICI in multipath scenario. In ICI self cancellation technique, one data symbol is mapped on two sub-carriers with different weighting coefficient and the selection of weighting coefficient is carefully so the ICI signal within two sub-carriers are cancelled by each other. The performances of ICI self cancellation techniques are analyzed in terms of bit error rate (BER) and carrier to interference ratio (CIR). The simulation results show that improvement of BER and CIR is different for using different weighting coefficients and the improvement in CIR of Symmetric Data Conversion Scheme (SDCS) is better compare to other techniques at lower normalized frequency offset.
机译:正交频分复用(OFDM)系统对载波频率偏移非常敏感。 OFDM系统的性能由于发射器和接收器之间的频率不匹配以及多普勒频移而导致的频率偏移而降低。频率偏移导致将ICI引入OFDM系统。在本文中,我们分析了ICI自抵消技术,以减少ICI在多径情况下的影响。在ICI自消除技术中,一个数据符号被映射在具有不同加权系数的两个子载波上,并且加权系数的选择是谨慎的,因此两个子载波内的ICI信号被彼此抵消。从误码率(BER)和载波干扰比(CIR)方面分析了ICI自消除技术的性能。仿真结果表明,在使用不同加权系数的情况下,BER和CIR的改善是不同的,对称数据转换方案(SDCS)的CIR的改善在较低归一化频率偏移下优于其他技术。

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