Evaluation of polynomial matrix SVD-based broadband MIMO equalization in an optical multi-mode testbed

André Sandmann, A. Ahrens, S. Lochmann
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引用次数: 2

Abstract

Interference in frequency-selective multiple-input multiple-output (MIMO) systems can be removed by applying a block-transmission description based on spatio-temporal vector coding and using singular value decomposition (SVD). In this contribution a newly developed SVD algorithm for polynomial matrices (PMSVD) is analyzed and compared to the commonly used SVD-based MIMO equalization. Since the PMSVD processing results in independent single-input single-output layers exhibiting a frequency-selective characteristic, a simple zero forcing equalizer or an optimal Viterbi detector is applied in this work so as to remove the occurring inter-symbol interferences. The PMSVD orthogonalization is compared with the conventional SVD in terms of the achievable spectral efficiencies, showing that there is no loss applying PMSVD over SVD processing. In addition, the bit-error rate performances in different channel scenarios are evaluated and optimized by applying combined bit and power allocation schemes. One scenario involves the measured specific impulse responses of a (2×2) optical MIMO channel, consisting of a 1.4 km multi-mode fiber, optical fusion couplers for mode multiplexing and demultiplexing when operating at a wavelength of 1576 nm. The computer simulation results show that the PMSVD could be an alternative signal processing method compared to conventional SVD-based approaches in frequency-selective MIMO channels.
基于多项式矩阵svd的宽带MIMO均衡在光学多模试验台中的评价
采用基于时空矢量编码的分块传输描述和奇异值分解(SVD)方法可以消除选频多输入多输出(MIMO)系统中的干扰。本文分析了一种新开发的多项式矩阵SVD算法(PMSVD),并将其与常用的基于SVD的MIMO均衡进行了比较。由于PMSVD处理导致独立的单输入单输出层表现出频率选择特性,因此在这项工作中应用了简单的零强迫均衡器或最佳Viterbi检测器,以消除发生的符号间干扰。将PMSVD正交化与传统SVD正交化在可实现的频谱效率方面进行了比较,表明PMSVD在SVD处理上没有损失。此外,通过采用位功率组合分配方案,对不同信道场景下的误码率性能进行了评估和优化。一种方案涉及测量(2×2)光MIMO通道的比脉冲响应,该通道由1.4 km多模光纤、用于模式复用和解复用的光融合耦合器组成,工作波长为1576 nm。计算机仿真结果表明,在频率选择MIMO信道中,PMSVD可以作为一种替代传统的基于svd的信号处理方法。
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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