Technical Program

Paper Detail

Paper:	SPCOM-P8.1
Session:	MIMO STC and Decoding
Time:	Thursday, May 18, 10:00 - 12:00
Presentation:	Poster
Topic:	Signal Processing for Communication: MIMO space-time code design, analysis and decoding algorithms
Title:	Extended Differential Unitary Space-Time Modulation: A Non-Coherent Scheme with Error Penalty less than 3dB
Authors:	Wing-Kin Ma, Chong-Yung Chi, National Tsing Hua University, Taiwan; P. C. Ching, Chinese University of Hong Kong, Hong Kong SAR of China
Abstract:	In this paper we propose an extended differential unitary space-time modulation (xDUSTM) scheme that can offer improved error performance over the differential unitary space-time modulation(DUSTM) scheme. DUSTM is well suited to rapidly time-varying unknown channels. It has a simple structure, but incurs an error performance penalty of about 3dB compared to its coherent counterpart. The xDUSTM scheme considers moderately fast time-varying channels, and is designated to exploit such a characteristic for performance improvement. In xDUSTM, a problem that needs to be addressed is the complexity of its non-coherent maximum-likelihood (ML) receiver. We show that by choosing the orthogonal space-time block code (OSTBC) designs, the ML problem can be reduced to a Boolean quadratic program for which highly effective algorithms are available. Simulation results illustrate that the error performance penalty in xDUSTM can be reduced to 1dB.