Generalized spatial modulation (GSM) is a novel multiple-antenna technique offering flexibility among spectral efficiency, energy efficiency, and the cost of RF chains. In this paper, a novel class of sequence sets, called enhanced cross Zcomplementary set (E-CZCS), is proposed for efficient training sequence design in broadband GSM systems. Specifically, an E-CZCS consists of multiple CZCSs possessing front-end and tail-end zero-correlation zones (ZCZs), whereby any two distinct CZCSs have a tail-end ZCZ when a novel type of cross-channel aperiodic correlation sums is considered. The theoretical upper bound on the ZCZ width is first derived, upon which optimal E-CZCSs with flexible parameters are constructed. For optimal channel estimation over frequency-selective channels, we introduce and evaluate a novel GSM training framework employing the proposed E-CZCSs.

翻译：广义空间调制（GSM）是一种新颖的多天线技术，可在频谱效率、能量效率与射频链路成本之间提供灵活性。本文针对宽带GSM系统中的高效训练序列设计，提出了一类新型序列集——增强交叉Z互补集（E-CZCS）。具体而言，E-CZCS由多个具有前端与尾端零相关区（ZCZ）的CZCS组成，当考虑新型跨信道非周期互相关和时，任意两个不同的CZCS均具有尾端零相关区。首先推导了ZCZ宽度的理论上界，并据此构建了参数灵活的优化E-CZCS。针对频率选择性信道下的最优信道估计，我们引入并评估了一种采用所提E-CZCS的新型GSM训练框架。