Abstract
Space-time (ST) coding offers an effective transmit diversity technique to combat fading, but most existing space-time coding schemes assume flat fading channels that may not be valid for wideband wireless mobile communications. For multiuser transmissions over multipath environment (frequency-selective fading channel), ST coding is challenging due to the presence of not only MAI (multiple access interference) but also ISI (intersymbol interference). In this paper, a novel ST block coding scheme based on block processing is proposed for TD-CDMA systems in frequency-selective channels, and block linear joint detection algorithms are developed. Then, we simplify these algorithms and get a low cost but good performance joint detection algorithm for spacetime block-coded TD-CDMA systems.
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