NDLI: The Gaussian two-way diamond channel

Content Provider	IEEE Xplore Digital Library
Author	Prathyusha, V. Bhashyam, S. Thangaraj, A.
Copyright Year	2013
Description	Author affiliation: Dept. of Electr. Eng., Indian Inst. of Technol. Madras, Chennai, India (Prathyusha, V.; Bhashyam, S.; Thangaraj, A.)
Abstract	We consider two-way relaying in a Gaussian diamond channel, where two terminal nodes wish to exchange information using two relays. A simple baseline protocol is obtained by time-sharing between two one-way protocols. To improve upon the baseline performance, we propose two compute-and-forward (CF) protocols - Compute-and-forward-Compound multiple access channel (CF-CMAC) and Compute-and-forward-Broadcast (CF-BC). These protocols mix the two flows through the two relays and achieve rates better than the simple time-sharing protocol. We derive an outer bound to the capacity region that is satisfied by any relaying protocol, and observe that the proposed protocols provide rates close to the outer bound in certain channel conditions. Both the CF-CMAC and CF-BC protocols use nested lattice codes in the compute phases. In the CF-CMAC protocol, both relays simultaneously forward to the destinations over a Compound Multiple Access Channel (CMAC). In the simpler CF-BC protocol's forward phase, one relay is selected at a time for Broadcast Channel (BC) transmission depending on the rate-pair to be achieved. We also consider the diamond channel with direct source-destination link and the diamond channel with interfering relays. Outer bounds and achievable rate regions are compared for these two channels as well. Mixing of flows using the CF-CMAC protocol is shown to be good for symmetric two-way rates.
Sponsorship	IEEE Cont. Syst. Soc.
Starting Page	1292
Ending Page	1299
File Size	567726
Page Count	8
File Format	PDF
e-ISBN	9781479934102
DOI	10.1109/Allerton.2013.6736675
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-10-02
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Protocols Lattices Diamonds Receivers Decoding Compounds Relays
Content Type	Text
Resource Type	Article

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