Harnessing the benefits of noisy feedback
Abstract
The availability of feedback in a communications system opens the door to many new transmission techniques. In this work, the area of linear feedback coding is investigated for its utility in different communications scenarios. Linear feedback codes are communications schemes in which the transmissions are a strictly linear function of the message to be sent and side-information supplied by feedback from the receiver. This particular class of transmission strategies is alluring not only because of its inherent low complexity but also its proven benefits for reliability. However, the previous demonstrated advantages of these techniques were hinged upon a very impractical assumption: the feedback information sent back by the receiver is received perfectly at the transmitter. This assumption, which has allowed for valuable theoretical work in feedback communications, also greatly inhibits the work that invokes it. Thus, in this work, we investigate the utility of the class of linear feedback codes when this assumption is not made or, explicitly, when the side-information present at the receiver is assumed to be noisy. Specifically, three communication systems are considered: point-to-point systems, multiple-antenna packet-based systems, and multiuser systems. It is shown in all three settings that through the introduction of simple, linear transmission strategies one can greatly increase the reliability and/or throughput of communication systems.
Degree
Ph.D.
Advisors
Love, Purdue University.
Subject Area
Communication|Engineering
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