导频符号辅助信道估计4×4空时分组编码空间调制系统

Yusuf Acar, H. Dogan, E. Panayirci
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引用次数: 0

摘要

在多输入多输出(MIMO)系统中,空间调制(SM)和空时分组编码(STBC)最近被结合起来,以利用两者的优点同时避免它们的缺点。在STBC-SM的开创性工作中,假设接收机完全了解信道衰落系数。这项工作1解决了在时变信道存在的情况下,4×4 STBC-SM系统的信道估计的挑战性和及时性问题。本文首先采用最小二乘法对导频持续时间的信道进行估计,然后采用线性插值或最近邻插值算法对信道进行插值。仿真结果表明,基于线性插值的信道估计比基于最近邻插值的信道估计具有显著的性能提升。特别是,在BER = 10-5时,与使用二进制相移键控(BPSK)调制的4×4 STBC-SM系统的最近的基于插值的接收器在120km/h时相比,节省了约5dB。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Pilot symbol assisted channel estimation for 4×4 space time block coded spatial modulation systems
Recently, spatial modulation (SM) and space-time block coding (STBC) are combined to take advantage of the benefits of both while avoiding their drawbacks for multiple-input and multiple-output (MIMO) systems. The pioneering works on STBC-SM assume that perfect knowledge of the channel fading coefficients is available at the receiver. This work1 addresses the challenging and timely problem of channel estimation for 4×4 STBC-SM systems in the presence of time-varying channels. In this paper, the estimation of channel at pilot durations is done by least square (LS) method and then the channel interpolation is performed by linear interpolation or nearest neighbor inter-polation algorithms. Simulation results have demonstrated that the proposed channel estimation based on the linear interpolation offer substantial performance gains over the channel estimation based on the nearest neighbor interpolation. In particular, a savings of about 5dB is obtained at BER = 10-5, as compared with the nearest interpolation based receiver at 120km/h for 4×4 STBC-SM systems with the binary phase shift keying (BPSK) modulation.
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