预编码空时共轭双径OFDM系统的误码率性能

H. Yeh, Jun Zhou
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引用次数: 1

摘要

设计一种鲁棒的无线通信系统,提高移动信道的误码率是至关重要的。提出了一种采用共轭对消(CC)双路传输方案的2x2时空正交频分复用(OFDM)系统。与传统的2x2 ST-OFDM系统相比,2x2 STCC-OFDM系统在移动信道中具有良好的载波间干扰(ICI)抑制性能,具有更好的BER。采用Zadoff-Chu变换(ZCT)、斜变换(ST)、离散Hartley变换(DHT)、Haar变换(HT)和Walsh-Hadamard变换(WHT)等5种正交变换作为预编码器进一步提高误码率。ZCT逐行预编码器提供最低的峰均功率比和良好的误码率性能。仿真结果表明,所提出的STCC-OFDM系统对各种信道环境都具有鲁棒性,尽管与ST-OFDM相比,STCC-OFDM系统以降低带宽效率为代价提高了误码率,但它们可以通过更高的QAM星座规模来补偿。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
BER Performance of Pre-Coded Space-Time Conjugate Two-Path OFDM Systems
It’s critical to design a robust wireless communication system that achieves an improved bit error rate (BER) in mobile channels. In this paper, a 2x2 space-time (ST) orthogonal frequency division multiplexing (OFDM) system is proposed with conjugate cancellation (CC) two-path transmission scheme. The 2x2 STCC-OFDM system features in the excellent inter-carrier interference (ICI) mitigation in the mobile channels with a better BER than that of a conventional 2x2 ST-OFDM system. Five orthogonal transforms are employed as the precoder to enhance the BER further, such as Zadoff-Chu transform (ZCT), slant transform (ST), discrete Hartley transform (DHT), Haar transform (HT), and Walsh–Hadamard transform (WHT). ZCT row wise precoder provide the lowest peak-to-average power ratio and good BER performance. Simulations demonstrate that the proposed STCC-OFDM systems are robust to various channel environments Although the STCC-OFDM systems improve BER with the cost of reducing bandwidth efficiency when compared to a ST-OFDM, they can be compensated by a higher QAM constellation size.
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