Enhanced Frequency-Domain Signal Detection for Single-Carrier Spatial Modulation Systems

Yinman Lee, Sok-Ian Sou
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Abstract

It is shown that spatial modulation (SM) can be effectively combined with single-carrier (SC) transmission to obtain the advantages in both aspects for broadband wireless communications. However, the signal detection methods for the cyclic-prefix (CP) based SC-SM system are generally not sophisticated enough to provide good performance in many scenarios. In this paper, to lower the frequency-domain equalization complexity, we first consider employing a special recursive method to invert the Gram matrix in the minimum mean-squared-error (MMSE) weight calculation. Second, energy detection is used to locate the active transmit antennas for each SM symbol. Simple single-symbol maximum likelihood (ML) detection can then be used to extract the transmitted modulated symbols in those active transmit antennas with negligible loss in the error-rate performance. On the other hand, $M$ -algorithm is applied for enhancing the error rate to various extents. Results show that a better compromise between the computational complexity and the error rate can
单载波空间调制系统的增强频域信号检测
研究表明,在宽带无线通信中,空间调制(SM)可以有效地与单载波(SC)传输相结合,从而获得两方面的优势。然而,基于循环前缀(CP)的SC-SM系统的信号检测方法通常不够复杂,无法在许多情况下提供良好的性能。在本文中,为了降低频域均衡的复杂度,我们首先考虑在最小均方误差(MMSE)权值计算中采用一种特殊的递归方法来反演Gram矩阵。其次,利用能量检测对每个SM符号的有源发射天线进行定位。然后可以使用简单的单符号最大似然(ML)检测来提取那些有源发射天线中的发射调制符号,其误码率性能损失可以忽略不计。另一方面,采用$M$ -算法,不同程度地提高错误率。结果表明,在计算复杂度和错误率之间找到一个更好的折衷方案是可行的
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