Four-Group Decodable Space-Time Block Codes

TL;DR

This paper introduces two novel rate-one full-diversity space-time block codes with the lowest known decoding complexity, optimized for systems with power-of-two antennas, offering improved performance and efficiency.

Contribution

The paper presents two new space-time block codes that achieve full diversity with minimal decoding complexity and delay, outperforming existing codes in multiple aspects.

Findings

Higher code rate than existing codes

Lower decoding complexity and delay

Better performance in simulations

Abstract

Two new rate-one full-diversity space-time block codes (STBC) are proposed. They are characterized by the \emph{lowest decoding complexity} among the known rate-one STBC, arising due to the complete separability of the transmitted symbols into four groups for maximum likelihood detection. The first and the second codes are delay-optimal if the number of transmit antennas is a power of 2 and even, respectively. The exact pair-wise error probability is derived to allow for the performance optimization of the two codes. Compared with existing low-decoding complexity STBC, the two new codes offer several advantages such as higher code rate, lower encoding/decoding delay and complexity, lower peak-to-average power ratio, and better performance.