Quasi-Orthogonal Space-Time-Frequency Trellis Codes for MIMO-OFDM Systems

TL;DR

This paper introduces a full-rate Quasi-Orthogonal Space-Time-Frequency Trellis code for MIMO-OFDM systems, enhancing diversity and coding gain, and demonstrating superior error performance over existing codes.

Contribution

It proposes a novel systematic design of a full-rate QOSTFTC that combines set partitioning with quasi-orthogonal structures for improved MIMO-OFDM performance.

Findings

Outperforms existing QOSTFTC in frame error rate

Provides multipath, transmit, and receive diversity

Achieves high coding gain in frequency-selective channels

Abstract

The main objective of this project is to design the full-rate Space-Time-Frequency Trellis code (STFTC), which is based on Quasi-Orthogonal designs for Multiple-Input Multiple-Output (MIMO) Orthogonal Frequency Division Multiplexing (OFDM) systems. The proposed Quasi-Orthogonal Space-Time-Frequency Trellis code combines set partitioning and the structure of quasi-orthogonal space-frequency designs in a systematic way. In addition to multipath diversity and transmit diversity, the proposed code provides receive diversity, array gain, and achieve high-coding gain over a frequency selective fading channel. As simulation results demonstrate, the code outperforms the existing Quasi-Orthogonal Space-Time-Frequency Trellis codes in terms of frame error rate performance.