Suppression of carrier frequency offset and phase noise in adaptive bit loading OFDM system

2010 International Conference on Information and Communication Technology Convergence (ICTC) Pub Date : 2010-12-23 DOI:10.1109/ICTC.2010.5674721

Haeseong Jeong, H. Ryu, Jin-up Kim

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引用次数: 2

Abstract

Introduce adaptive bit loading technique into orthogonal frequency division multiplexing (OFDM) system can highly improve system performance in frequency selective fading channel. However, similar with ordinary OFDM system, this system is very sensitive to carrier frequency offset (CFO) and phase noise. When CFO and phase noise exist, common phase error (CPE) as well as inter carrier interference (ICI) will be generated to disturb the received signal and system performance will be seriously degraded. In this paper, we analyze the interferences caused by CFO and phase noise in adaptive bit loading OFDM system when the channel condition is frequency selective fading channel. Then the suppression method based on block type pilots is introduced to overcome the interferences simultaneously. From the simulation results, it can be seen that CFO and phase noise will cause serious system performance degradation. But after we perform the suppression processing, system performance can be significantly improved.

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自适应位加载OFDM系统中载波频偏和相位噪声的抑制

在正交频分复用(OFDM)系统中引入自适应比特加载技术，可以极大地提高系统在频率选择性衰落信道中的性能。然而，与普通OFDM系统一样，该系统对载波频偏和相位噪声非常敏感。当CFO和相位噪声存在时，会产生共相位误差(CPE)和载波间干扰(ICI)，干扰接收信号，严重降低系统性能。本文分析了信道条件为频率选择性衰落信道时，自适应比特负载OFDM系统中CFO和相位噪声对系统的干扰。然后引入基于块导频的抑制方法来同时克服干扰。从仿真结果可以看出，CFO和相位噪声会导致系统性能严重下降。但在进行了抑制处理后，系统的性能得到了明显的提高。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2010 International Conference on Information and Communication Technology Convergence (ICTC)

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