NDLI: Asymmetric Compute-and-Forward: Going beyond one hop

Content Provider	IEEE Xplore Digital Library
Author	Tan, Yihua Yuan, Xiaojun Liew, Soung Chang Kavcic, Aleksandar
Copyright Year	2014
Description	Author affiliation: School of Information Science and Technology, ShanghaiTech University, Shanghai, 200031, China (Yuan, Xiaojun) \|\| Institute of Network Coding, The Chinese University of Hong Kong, Hong Kong, China (Tan, Yihua; Liew, Soung Chang) \|\| Department of Electrical Engineering, University of Hawaii, Honolulu, HI 96822, USA (Kavcic, Aleksandar)
Abstract	We consider a two-hop relay model in which multiple sources communicate with a single destination via multiple distributed relays. We propose an asymmetric Compute-and-Forward (CoF) scheme that allows lattice coding with different coarse and fine lattices at the sources. The proposed scheme is motivated by the observation that, in an asymmetric CoF system, a higher transmission power at a source does not necessarily translate to a higher achievable information rate. We show that significant performance enhancement can be achieved by optimizing the transmission powers of the sources below their respective budgets. Further, the asymmetric construction of lattice coding allows the relays to conduct different modulo operations to reduce their forwarding rates, thereby supporting higher rates at the sources. However, modulo operations in general incur information loss, and so need to be carefully designed to ensure that the destination can successfully recover the source messages. As such, we propose a novel successive recovering algorithm for decoding at the destination, and establish sufficient conditions to guarantee successful recovery. Numerical results are provided to verify the superiority of our proposed scheme over other schemes.
Starting Page	667
Ending Page	674
File Size	894724
Page Count	8
File Format	PDF
ISBN	9781479980093
DOI	10.1109/ALLERTON.2014.7028519
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-09-30
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Transmitters Lattices Educational institutions Encoding Vectors Decoding Relays
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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