Space-Time Transmitter and Receiver Design with Delay Constraints

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Abstract:Communication with multiple antennas is a promising technology forfuture high-rate wireless communication systems. It is often referredto as space-time communication because the transmitted signal isencoded both across the antennas (space) and time. Over the past tenyears, various space-time coding and decoding schemes have beendeveloped. They can be roughly divided into two categories:short-frame code designs and long-frame code designs. Relatively lessattention has been given to the transceiver design issues inspace-time communications with medium-length frames, i.e., thosecontaining more than a few but less than, say, a thousand bits. We usemedium-length frames in practice for several reasons: i) The data maybe bursty and of medium-length, which is often the case in Internettraffic; ii) There may be stringent delay constraints which forbidlong frame transmissions, such as in real-time computing and controlapplications. Such medium-length transmissions are not in thespace-time block-code (or short-code) paradigm and yet not long enoughto allow powerful error-control codes such as turbo or low-densityparity-check codes to demonstrate their full ``power''.This project investigates several key issues in medium-lengthspace-time communications. Firstly, it pursues the problem oftransmitter code design for delay-constrained space-timecommunications. Secondly, it investigates the problem of high decodingcomplexity in space-time systems with a large number of transmitantennas and/or a large modulation constellation, and developslow-complex detectors for such scenarios. Thirdly, it deals with theproblem of space-time channel estimation at the receiver with orwithout training symbols. The research in these topics will alsobenefit long-frame space-time communication systems, as well asimportant applications in multi-user detection and in future sensornetworks.