Enhanced Cross Z-Complementary Set and Its Application in Generalized Spatial Modulation

TL;DR

This paper introduces enhanced cross Z-complementary sets (E-CZCS) for improved training sequence design in broadband generalized spatial modulation (GSM), enabling better channel estimation with optimal correlation properties.

Contribution

It proposes a new class of sequence sets, E-CZCS, with zero-correlation zones, and constructs optimal sets with flexible parameters for GSM training.

Findings

Derived the upper bound on ZCZ width.

Constructed optimal E-CZCSs with flexible parameters.

Demonstrated improved channel estimation in GSM systems.

Abstract

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.