Khatri-Rao Unitary Space-Time Modulation

Lei WANG  Shihua ZHU  Jun WANG  Yanxing ZENG  

IEICE TRANSACTIONS on Communications   Vol.E89-B   No.9   pp.2530-2536
Publication Date: 2006/09/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e89-b.9.2530
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
transmit diversity,  Khatri-Rao product,  unitary space-time modulation,  non-coherent detection,  wireless communications,  

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Based on the Khatri-Rao matrix product, we propose a novel unitary space-time modulation design called KR-USTM in this paper. Different from existing USTM schemes, such as the systematic approach and space-time frequency-shift keying (ST-FSK), KR-USTM does not require any computer search and can be applied to any number of transmit antennas. Moreover, the special structure of KR-USTM also makes it a high-rate scheme and achieve full antenna diversity as well as lower decoding complexity. Simulation results show that the proposed KR-USTM constellation achieves error performance comparable to existing USTM designs at low rates, while it outperforms them at high rates.