Interference channels with half-duplex source cooperation

Wu, Rui

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https://hdl.handle.net/2142/24136 Copy

Description

Title

Interference channels with half-duplex source cooperation

Author(s)

Wu, Rui

Issue Date

2011-05-25T15:08:46Z

Director of Research (if dissertation) or Advisor (if thesis)

Viswanath, Pramod

Department of Study

Electrical & Computer Eng

Discipline

Electrical & Computer Engr

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

M.S.

Degree Level

Thesis

Keyword(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.

Graduation Semester

2011-05

Permalink

http://hdl.handle.net/2142/24136

Copyright and License Information

Copyright 2011 Rui Wu

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