Differential Transmit Diversity Based on Quasi-Orthogonal Space-Time Block Code

TL;DR

This paper introduces a novel differential space-time modulation scheme using Quasi-Orthogonal Space-Time Block Code, achieving full transmit diversity with higher code rate and lower decoding complexity than existing methods.

Contribution

It proposes a new DSTM scheme based on QO-STBC with joint modulation and customized constellation design, enhancing spectral efficiency and reducing decoding complexity.

Findings

Provides full transmit diversity with non-coherent detection.

Achieves higher code rate compared to orthogonal STBC-based DSTM.

Offers lower decoding complexity than group code-based schemes.

Abstract

By using joint modulation and customized constellation set, we show that Quasi-Orthogonal Space-Time Block Code (QO-STBC) can be used to form a new differential space-time modulation (DSTM) scheme to provide full transmit diversity with non-coherent detection. Our new scheme can provide higher code rate than existing DSTM schemes based on Orthogonal STBC. It also has a lower decoding complexity than the other DSTM schemes, such as those based on Group Codes, because it only requires a joint detection of two complex symbols. We derive the design criteria for the customized constellation set and use them to construct a constellation set that provides a wide range of spectral efficiency with full diversity and maximum coding gain.