Analysis and Compensation of Phase Noise in Vector OFDM Systems
Analysis and Compensation of Phase Noise in Vector OFDM Systems
复制标题
矢量 OFDM 系统中的相位噪声分析与补偿
DOI：
10.1109/tsp.2014.2360153
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发表时间：
2014-09
影响因子：
5.4
通讯作者：
Minjian Zhao
中科院分区：
文献类型：
--
作者：
Xiang-Gen Xia;Sami Ahmed Haider;Aiping Huang;Minjian Zhao
单发射天线系统的矢量正交频分复用（V-OFDM）是OFDM的推广，其中单载波频域均衡（SC-FDE）和OFDM只是两种特殊情况。它已被证明能够收集多径分集，因此通常优于OFDM。相位噪声下的OFDM性能已经在文献中被广泛研究。这些影响可以概括为引入共同的相位误差（CPE）和载波间干扰（ICI），导致性能差。相位噪声下的V-OFDM系统的性能仍然没有得到研究，在本文中，它是在V-OFDM系统中的相位噪声会导致一个共同的矢量块相位误差（CVBPE）以及矢量块间载波干扰（IVBCI）的效果。推导了V-OFDM系统的信干噪比（SINR）表达式，并与仿真结果进行了比较。推导了一种基于导频向量CVBPE的相位噪声估计方法，并结合最大似然（ML）和线性最小均方误差（LMMSE）估计器对相位噪声进行估计。结果表明，与OFDM系统相比，V-OFDM系统能够以较低的复杂度进行相位噪声估计。然后使用去相关和消除技术来补偿相位噪声损伤。通过对编码和未编码系统的仿真，验证了所提出的相位噪声估计和补偿方法的分析和有效性。
Vector orthogonal frequency division multiplexing (V-OFDM) for single transmit antenna systems is a generalization of OFDM where single-carrier frequency domain equalization (SC-FDE) and OFDM are just two special cases. It has been shown to be able to collect multipath diversity and thus generally outperforms OFDM. The performance of OFDM under phase noise has been extensively studied in the literature. These effects can be summarized as introducing a common phase error (CPE) and inter carrier interference (ICI) resulting in poor performance. The performance of V-OFDM under phase noise still remains uninvestigated and in this paper it is shown that phase noise in V-OFDM systems leads to a common vector block phase error (CVBPE) as well as an inter vector block carrier interference (IVBCI) effect. An expression for the signal plus interference noise ratio (SINR) for a V-OFDM system is derived and found to agree closely with simulation results. A pilot vector CVBPE based phase noise estimation technique is derived, and then combined with the maximum likelihood (ML) and the linear minimum mean square error (LMMSE) estimators to estimate the phase noise. It turns out that compared with OFDM, V-OFDM systems can perform phase noise estimation with lower complexity. The decorrelation and cancellation techniques are then used to compensate for the phase noise impairment. Numerical results for both coded and uncoded systems with perfect and practical channel estimation are provided to validate the analysis and effectiveness of the proposed phase noise estimation and compensation methods.
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影响因子：
8.3
作者：
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DOI：
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期刊：
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DOI：
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发表时间：
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期刊：
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影响因子：
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