ITR/SI: Multi-Antenna, Multi-User Communications

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Future generation mobile wireless communication systems (third generationand beyond) are expected to provide high data rates, accomodate highlymobile users, and support a wide variety of services including data, voice,video and interactive multimedia. Power (battery) limitations andthe scarcity of radio spectrum (relative to the ambitions of such services)will dictate the need for cellular networks in which these resourcesmust be used highly efficiently so as to support the continued growthin demand for wireless services into the future. Theessential infrastructure required at the physicallayer to fulfill this demand is a power and bandwidth efficient,multi-antenna, multi-user wireless communications technology.The investigators of this project will develop several key aspects of atheory of multi-user, multi-transmit antenna communication through a studyof high-performance, interference resistant receivers, signature sequencedesigns and multi-user signal constellation optimization. Their goal is torealize, through simple system design, the power and spectral efficiencytrade-offs that are achievable for multi-antenna wireless communicationsover fading channels. While emphasizing fundamental limits, theinvestigators will also focus on complexity constrained systems as well.They will develop results in the theory of multi-user detection andsignature sequence optimization for multiple receive antennas for overloadedCDMA systems. Generalization of these results will be pursued to codedmodulation and multiple transmit (and receive) antenna systems in order tofurther improve the performance and/or achievable spectral efficienciesthrough more sophisticated signaling strategies combined with sub-optimal,complexity-constrained, high-performance multi-user decoding methods.