Rematch-and-Forward: Joint Source-Channel Coding for Parallel Relaying With Spectral Mismatch

The Gaussian parallel relay network, introduced by Schein and Gallager, consists of a concatenation of a Gaussian additive broadcast channel from a single encoder to a layer of relays followed by a Gaussian multiple-access channel from the relays to the final destination (decoder), where all noises...

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Bibliographic Details
Published in:	IEEE transactions on information theory Vol. 60; no. 1; pp. 605 - 622
Main Authors:	Kochman, Yuval, Khina, Anatoly, Erez, Uri, Zamir, Ram
Format:	Journal Article
Language:	English
Published:	New York, NY IEEE 01.01.2014 Institute of Electrical and Electronics Engineers The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:	amplify-and-forward Analog Applied sciences bandwidth mismatch Bandwidths broadcast channel Broadcasting. Videocommunications. Audiovisual Coding, codes Coherence coherence gain Communication channels Communications networks Decoding Digital transmission Distortion measurement Exact sciences and technology hybrid digital-analog transmission Information theory Information, signal and communications theory ISI channel joint source-channel coding Joints Miscellaneous modulo-lattice modulation multiple access channel network capacity Parallel relay network Relays Signal and communications theory Signal to noise ratio Systems, networks and services of telecommunications Telecommunications Telecommunications and information theory Transmission and modulation (techniques and equipments) Performance evaluation Relaying Relay Relay network modulo-lattice modulation broadcast channel bandwidth mismatch Joint source channel coding network capacity Modulation multiple access channel Broadcast channels Routing protocols amplify-and-forward Multiple access Analog transmission Gaussian channel Coding circuit Transmission protocol Decoding Mismatching Digital transmission coherence gain Parallel relay network Concatenation joint source―channel coding Intersymbol interference hybrid digital―analog transmission Coherence ISI channel Conflict theory Multiple channel
ISSN:	0018-9448, 1557-9654
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Summary:	The Gaussian parallel relay network, introduced by Schein and Gallager, consists of a concatenation of a Gaussian additive broadcast channel from a single encoder to a layer of relays followed by a Gaussian multiple-access channel from the relays to the final destination (decoder), where all noises are independent. This setup exhibits an inherent conflict between digital and analog relaying; while analog relaying [known as amplify-and-forward (A&F)] suffers from noise accumulation, digital relaying (known as decode-and-forward) looses the potential coherence gain in combining the relay noises at the decoder. For a large number of relays, the coherence gain is large, and thus analog relaying has better performance; however, it is limited to white channels of equal bandwidth. In this paper, we present a generalization of the analog approach to the case of bandwidth mismatch. Our strategy, coined rematch and forward (R&F), is based upon applying joint source-channel coding techniques that belong to a certain class of maximally analog schemes. Using such techniques, R&F converts the bandwidth of the broadcast section to that of the multiple-access section, creating an equivalent matched-bandwidth network over which A&F is applied. It is shown that this strategy exploits the full bandwidth of the individual channels, without sacrificing the coherence gain offered by A&F. Specifically, for given individual-link capacities, R&F remains within a constant gap from the network capacity for any number of relays and any bandwidth ratio between the sections. Finally, the approach is extended to the case of colored channels.
Bibliography:	SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 14
ISSN:	0018-9448 1557-9654
DOI:	10.1109/TIT.2013.2287722