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Title:Interference channels with half-duplex source cooperation
Author(s):Wu, Rui
Advisor(s):Viswanath, Pramod
Department / Program:Electrical & Computer Eng
Discipline:Electrical & Computer Engr
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Interference channel
Source cooperation
Half duplex
Cognitive channel
Abstract:The performance gain of allowing half-duplex source cooperation is studied for Gaussian interference channels. The source cooperation is in-band, meaning that each source can listen to the other source's transmission, but there is no independent channel between the sources; half-duplex assumes that, at each time instant, the sources can either transmit or listen but cannot do both. This assumption differs from some previous works on source cooperation. When the cooperation is bidirectional and the channel gains are symmetric, the sum capacity is characterized within a constant. When the cooperation is unidirectional, from the primary to the secondary, it is essentially a cognitive channel. By requiring the primary to achieve a rate at most a constant from its link capacity, the best possible rate for the secondary is characterized within a constant. A general coding scheme is proposed for this type of channel. In the first step, only one source transmits and the other source listens. The active source can send data to its destination, share information with the other nodes, or relay data from the other source to the other destination. In the second step, both sources transmit. The shared information from the previous step and the interference channel together can be viewed as a virtual channel. On this virtual channel, the sources can do beamforming for the shared messages, and the destinations can partially cancel the interference, achieving better rates compared with the original interference channel.
Issue Date:2011-05-25
Rights Information:Copyright 2011 Rui Wu
Date Available in IDEALS:2011-05-25
Date Deposited:2011-05

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