设计可切换的预编码空时并行双径OFDM系统

H. Yeh, Jun Zhou
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引用次数: 1

摘要

提出了一种2x2时空(ST)正交频分复用(OFDM)系统,采用并行对消(PC)双路传输形成2x2 STPC系统。与2x2 ST-OFDM系统相比,2x2 STPC-OFDM系统具有更好的BER,可以缓解移动信道中的载波间干扰(ICI)。该设计可在两种工作模式之间切换:在具有较低误码率(BER)的移动衰落信道中,使用ST-OFDM实现高数据速率或使用STPC实现高可靠性。在此基础上,设计了一种多接收天线的通用STPC架构。它具有较高的分集阶数和较好的误码率。采用Zadoff-Chu变换(ZCT)和Walsh-Hadamard变换(WHT)两种正交变换作为预编码器,进一步提高了误码率。尽管所提出的STPC-OFDM系统需要双路传输,但其代价是降低带宽效率,仿真结果表明,与2x2 ST-OFDM相比,所提出的2x2 STPC-OFDM系统对各种信道环境具有鲁棒性,并且在公平数据速率下具有更好的BER性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Design Switchable Precoded Space-Time Parallel Two-Path OFDM Systems
A 2x2 space-time (ST) orthogonal frequency division multiplexing (OFDM) system is proposed with parallel cancellation (PC) two-path transmission to form a 2x2 STPC system. The 2x2 STPC-OFDM systems mitigate the inter-carrier interference (ICI) in the mobile channels with a better BER than that of a 2x2 ST-OFDM system. The design is switchable between two operation modes: either high data rate with ST-OFDM or high reliability with STPC in mobile fading channels having lower bit error rate (BER). Furthermore, a generalized STPC architecture is designed with multiple receiver antennas. It offers higher diversity order and better BER. Two orthogonal transforms, such as Zadoff-Chu transform (ZCT) and Walsh–Hadamard transform (WHT), are employed as the precoder to enhance the BER further. Although the proposed STPC-OFDM systems require two-path transmission with the cost of reducing bandwidth efficiency, simulations show that the proposed 2x2 STPC-OFDM systems are robust to various channel environments and have a better BER performance for fair data rate comparison with 2x2 ST-OFDM.
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