Wai-Choong Wong

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Space-time diversity techniques such as MIMO, space-time coding, and cooperative diversity can significantly improve spectral efficiency. However, they rely on precise instrumentation at the physical layer. In this paper, we propose a simple cooperative retransmission scheme which can achieve space-time diversity without modification to the physical layer.(More)
An arrayed-MIMO communication system, which employs antenna arrays at both ends of the wireless link, is proposed to leverage upon spatial information such as directions-of-arrival for achieving an improvement in performance. This is in contrast with conventional MIMO systems, which typically assume multiple independent antenna elements at the transmitters(More)
With the proliferation of location based services (LBS), various indoor localization systems have been proposed based on received signal strength (RSS). An acceptable localization performance is achieved by using fingerprinting-based methods. However, its performance is restricted by RSS deviation. This deviation is not well modelled and studied in past.(More)
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