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oai:www.ideals.illinois.edu:2142/24136 2023-07-10 col_2142_5131 col_2142_8888 com_2142_5130 com_2142_8887 com_2142_234

en Copyright 2011 Rui Wu Interference channel Source cooperation Half duplex Viswanath, Pramod Wu, Rui 2011-05-25T15:08:46Z 2011-05-25T15:08:46Z 2011-05-25T15:08:46Z 2011-05 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. Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2011-04-26T19:16:25Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 1 Wu_Rui.pdf: 475982 bytes, checksum: 1b8dd4ed94dd6cab574636bfb35ca565 (MD5) Made available in DSpace on 2011-05-25T15:08:46Z (GMT). No. of bitstreams: 2 Wu_Rui.pdf: 475982 bytes, checksum: 1b8dd4ed94dd6cab574636bfb35ca565 (MD5) license.txt: 4054 bytes, checksum: 63ed3180e3c2827d4897b8fda7670503 (MD5) http://hdl.handle.net/2142/24136 Cognitive channel Interference channels with half-duplex source cooperation Electrical & Computer Eng 1933 Electrical & Computer Engr 1200 University of Illinois at Urbana-Champaign Thesis M.S. PHD:Electr & Computer Eng-UIUC 10KS1200PHD