High-rate Complex Orthogonal Space-time Block Codes for 5 and 6 Transmit Antennas

Authors:
Changlong Xu;Yi Gong;Wei Yang
Affiliations:
State Key Laboratory of Rail Traffic Control and Safety, Beijing Jiaotong University, Beijing, China 100044 and National Mobile Communications Research Laboratory, Southeast University, Nanjing, C ...;School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore 639798;State Key Laboratory of Rail Traffic Control and Safety, Beijing Jiaotong University, Beijing, China 100044
Venue:
Wireless Personal Communications: An International Journal
Year:
2009

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Abstract

Based on orthogonal designs, space-time (ST) block codes that enable full diversity as well as a simple maximum likelihood (ML) decoding algorithm at the decoder can be constructed for more than two transmit antennas. For real constellations (such as PAM), ST block codes with transmission rate 1 can be designed from the real Hurwitz-Radon families for any number of transmit antennas. However, for complex constellations (such as M-PSK or M-QAM), ST block codes for more than two transmit antennas can only be constructed with rates less than 1. Previous attempts have been concentrated on complex orthogonal designs that provide ST block codes with full diversity and high transmission rates. In this paper, we present two rate 2/3 complex ST block codes from orthogonal designs for five and six transmit antennas, respectively. Simulation results are provided to demonstrate the significant performance gains made by the proposed ST block codes.