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arXiv 1001.2298cs.ITmath.IT
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用于抑制OFDM系统相位噪声的Turbo接收机设计

Turbo Receiver Design for Phase Noise Mitigation in OFDM Systems

Gokul Sridharan, Teng Joon Lim

摘要:

本文研究了OFDM系统中的相位噪声问题。相位噪声(PHN)是由本地振荡器的非理想性导致的收发器损害。我们提出了一种情况下,设计一个涡轮接收机的相位噪声损坏的系统,通过仔细研究的共同相位误差(CPE)的影响。使用一个近似的概率框架称为变分推理(VI),我们开发了一个软输入软输出(SISO)算法,产生后验比特级软估计,同时考虑到相位噪声的影响。该算法还提供了相位噪声序列的估计。使用该SISO算法,通过在SISO检测器和使用软解码算法的外部前向纠错(FEC)解码器之间传递软信息来设计turbo接收机。结果表明,涡轮接收机达到接近最佳性能。

英文摘要:

This paper addresses the issue of phase noise in OFDM systems. Phase noise (PHN) is a transceiver impairment resulting from the non-idealities of the local oscillator. We present a case for designing a turbo receiver for systems corrupted by phase noise by taking a closer look at the effects of the common phase error (CPE). Using an approximate probabilistic framework called variational inference (VI), we develop a soft-in soft-out (SISO) algorithm that generates posterior bit-level soft estimates while taking into account the effect of phase noise. The algorithm also provides an estimate of the phase noise sequence. Using this SISO algorithm, a turbo receiver is designed by passing soft information between the SISO detector and an outer forward error correcting (FEC) decoder that uses a soft decoding algorithm. It is shown that the turbo receiver achieves close to optimal performance.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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