Performance analysis of OFDM systems for broadband power line communications under impulsive noise and multipath effects
Performance analysis of OFDM systems for broadband power line communications under impulsive noise and multipath effects
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DOI：
10.1109/tpwrd.2005.844320
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发表时间：
2005-04-01
影响因子：
4.4
通讯作者：
Gunawan, E
中科院分区：
文献类型：
--
作者：
Ma, YH;So, PL;Gunawan, E
在电力线通信中，脉冲噪声和多径效应是造成误码的主要原因。本文从理论上分析了脉冲噪声和多径效应下正交频分复用（OFDM）系统的误码率性能。通过分析表明，OFDM可以减轻脉冲噪声的不利影响，只有受到严重干扰的脉冲噪声才会干扰OFDM系统的误码率性能。研究还表明，多径的不利影响比脉冲噪声更严重。本文采用保护间隔来提高OFDM系统的误码率性能。考虑到较长的保护间隔对信号功率的利用效率较低，研究了能获得最佳误码率性能的最佳保护间隔。
The impulsive noise and multipath effects are the main reasons to cause bit errors in power line communications. In this paper, the bit error rate (BER) performance of the orthogonal frequency division multiplexing (OFDM) system under the impulsive noise and multipath effects are theoretically analyzed in terms of closed form formulas. Through the analysis, it is shown that OFDM can mitigate the adverse effect of the impulsive noise and only the heavily disturbed impulsive noise will interfere the BER performance of the OFDM system. It is also shown that the adverse effect of multipath is more serious than that of impulsive noise. In this paper, the guard interval is used to improve the BER performance of the OFDM system. As the longer guard interval is inefficient in using the signal power, the optimum guard interval that can achieve the best BER performance is studied.