Optimization of MIMO unitary space-time codes

Xinjia Chen; Ernest Walker; Pradeep Bhattacharya; Jiecai Luo

doi:10.1117/12.818653

28 April 2009 Optimization of MIMO unitary space-time codes

Xinjia Chen, Ernest Walker, Pradeep Bhattacharya, Jiecai Luo

Proceedings Volume 7349, Wireless Sensing and Processing IV; 734902 (2009) https://doi.org/10.1117/12.818653
Event: SPIE Defense, Security, and Sensing, 2009, Orlando, Florida, United States

Abstract

One category of Space-Time codes are constellations of unitary matrix in parametric form. Optimization is essential for seeking parameters of constellation with the largest diversity product. In this research, we demonstrate that diversity product is not a good measure of constellation quality as widely adopted in communication community. Moreover, we show that good codes may not need to have full diversity. We propose better criteria for measuring the quality of constellations, which are also very amenable for optimization and particularly suitable for the gradient search method. Furthermore, we propose a new approach for signal constellation design. Instead of ambiguously discriminating low and high SNR, our techniques target the range of block error rate which is acceptable and not extremely small. Although the computational complexity of code designing can be formidable, we have developed techniques which significantly improve the efficiency. We obtain space-time codes which significantly outperform existing ones.

Citation Download Citation

Xinjia Chen, Ernest Walker, Pradeep Bhattacharya, and Jiecai Luo "Optimization of MIMO unitary space-time codes", Proc. SPIE 7349, Wireless Sensing and Processing IV, 734902 (28 April 2009); https://doi.org/10.1117/12.818653

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