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、能量效率和射频链路成本之间提供灵活性。本文提出了一类称为增强型交叉Z互补集（E-CZCS）的新型序列集，用于宽带GSM系统中的高效训练序列设计。具体而言，E-CZCS由多个具有前端和后端零相关区（ZCZ）的CZCS组成，当考虑新型交叉信道非周期相关和时，任意两个不同的CZCS具有后端ZCZ。首先推导了ZCZ宽度的理论上界，并在此基础上构建了具有灵活参数的最优E-CZCS。为在频率选择性信道上实现最优信道估计，我们引入并评估了一种采用所提E-CZCS的新型GSM训练框架。