Blind estimation of phase offset in OFDM subcarrier for coherent demodulation
Blind estimation of phase offset in OFDM subcarrier for coherent demodulation
复制标题
用于相干解调的 OFDM 子载波相位偏移盲估计
DOI：
10.1109/jsee.2012.00060
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发表时间：
2012-08
影响因子：
2.1
通讯作者：
Li, Ming
中科院分区：
文献类型：
--
作者：
Chen, Jian;Yang, Long;Li, Ming
摘要：针对正交频分复用（OFDM）信号，提出了一种低复杂度相位偏移估计（LC-POE）自适应算法。根据需要，将估计过程划分为多个尺度，加快了自适应收敛速度，保证了估计精度。通过逐步缩小探测范围和提高分辨尺度来估计真相位偏移。本文讨论了该算法的收敛性能和复杂度。仿真结果表明了该算法的有效性。LC-POE算法在ofdm系统中具有广阔的应用前景。关键词：相位偏移估计（POE），相干接收机，自适应相位恢复，正交频分复用（OFDM）Doi: 10.1109/ jsee.2012.00060虽然正交频分复用（OFDM）技术已经得到了广泛的研究，但其对同步误差的敏感性仍然是实际OFDM系统中的瓶颈[1,2]。文献中提出了许多估计载波相位偏移的算法。直接决策是相位偏移估计（POE）中常用的一种方法，它利用均衡器输出与相应决策之间的误差信号[3,4]。然而，这种方法的一个固有问题是由于错误决策而产生的相当大的自噪声，特别是在低信噪比（SNR）的情况下。提出了一种基于正交调幅（QAM）信号的载波相位偏移盲估计算法
Abstract: An adaptive algorithm named low complexity phase off-set estimation (LC-POE) is proposed for orthogonal frequency divi-sion multiplexing (OFDM) signals. Depending on the requirement,the estimation procedure is divided into several scales to accel-erate the adaptive convergence speed and ensure the estimationaccuracy. The true phase offset is estimated through shrinking thedetection range and raising the resolution scale step by step. Boththe convergence performance and complexity are discussed in thepaper. Simulation results show the effectiveness of the proposedalgorithm. The LC-POE algorithm is promising in the application ofOFDM systems. Keywords: phase offset estimation (POE), coherent receiver,adaptive phase recovery, orthogonal frequency division multiplex-ing (OFDM). DOI: 10.1109/JSEE.2012.00060 1. Introduction Although orthogonal frequency division multiplexing(OFDM) has been extensively studied, its sensitivity tosynchronization errors is still a bottleneck in practicalOFDM systems [1, 2].Many algorithms have been proposed to estimate thecarrier phase offset in literature. Decision directedis a general method used in the phase offset estima-tion (POE), which utilizes the error signal between theoutput of equalizer and corresponding decision [3, 4].However, an inherent problem of this method is theconsiderable self-noise due to erroneous decisions, es-pecially in the low signal-to-noise ratio (SNR) situ-ation [5]. A blind estimation algorithm of carrier phaseoffsets in quadrature amplitude modulation (QAM) sig-nals was proposed in [6], which was based on the
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影响因子：
10.4
作者：
M. Ruan;Zhenning Shi;M. Reed
通讯作者：
M. Ruan;Zhenning Shi;M. Reed
DOI：
10.1109/iccsit.2009.5234984
发表时间：
2009-09
期刊：
2009 2nd IEEE International Conference on Computer Science and Information Technology
影响因子：
--
作者：
Wei Cheng;Rui-juan Yang;Xin-yu Tuo;Zhao-yong Fan
通讯作者：
Wei Cheng;Rui-juan Yang;Xin-yu Tuo;Zhao-yong Fan
影响因子：
8.3
作者：
Shay Landis;B. Bobrovsky
通讯作者：
Shay Landis;B. Bobrovsky
影响因子：
5.4
作者：
G. Panci;S. Colonnese;S. Rinauro;G. Scarano
通讯作者：
G. Panci;S. Colonnese;S. Rinauro;G. Scarano
影响因子：
6.8
作者：
Wen-Long Chin
通讯作者：
Wen-Long Chin