Adaptive Transceivers for Wireless Spectrum Networks.

摘要

This project has been concerned with joint transmitter-receiver adaptation in a distributed, peer-to-peer wireless network. Parameters that can be adapted at the transmitter include rate, power, and signatures in space-time- frequency. In this report we summarize our work on the following topics: (1) Limited feedback schemes for optimizing spatial signatures for Multi-Input Multi-Output (MIMO) channels, and power and rates for multi-carrier transmission; (2) Optimization of training overhead for MIMO block fading channels with least squares filter estimation; (3) Optimization of training overhead with limited feedback for wideband multi-carrier channels, and for a narrowband channel with beamforming; (4) Allocation of training and data power U for a time-selective fading channel with known channel state information; (5) Source-channel coding schemes for block fading channels based on erasure and multi-resolution coding; and (6) Distributed power control for peer-to-peer networks based on the exchange of interference prices. Our main results characterize what channel state information should be exchange between the recover and transmitter (or neighboring transmitters in a distributed network) to provide substantial gains in spectral efficiency.