Distributed Decode-Forward for Relay Networks
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Title
- Distributed Decode-Forward for Relay Networks
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Author(s)
- Lim, Sung Hoon; Kim, Kwang Taik; Kim, Young-Han
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Alternative Author(s)
- 임성훈
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Publication Year
- 2017-07
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Abstract
- A new coding scheme for general N-node relay networks is presented for unicast, multicast, and broadcast. The proposed distributed decode-forward scheme combines and generalizes Marton coding for single-hop broadcast channels and the Cover-El Gamal partial decode-forward coding scheme for three-node relay channels. The key idea of the scheme is to precode all the codewords of the entire network at the source by multicoding over multiple blocks. This encoding step allows these codewords to carry partial information of the messages implicitly without complicated rate splitting and routing. This partial information is then recovered at the relay nodes and forwarded further. For N-node Gaussian unicast, multicast, and broadcast relay networks, the scheme achieves within 0.5N bits from the cutset bound, and thus from the capacity (region), regardless of the network topology, channel gains, or power constraints. Roughly speaking, distributed decode-forward is dual to noisy network coding, which generalized compress-forward to unicast, multicast, and multiple access relay networks.
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ISSN
- 0018-9448
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URI
- https://sciwatch.kiost.ac.kr/handle/2020.kiost/1203
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DOI
- 10.1109/TIT.2017.2701198
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Bibliographic Citation
- IEEE TRANSACTIONS ON INFORMATION THEORY, v.63, no.7, pp.4103 - 4118, 2017
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Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
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Subject
- RADIO ACCESS NETWORKS; BROADCAST CHANNELS; CAPACITY THEOREMS; INFORMATION-FLOW; DIAMOND NETWORK; INTERFERENCE; COMPRESSION; SUM
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Keywords
- Decode-forward; discrete memoryless network; Gaussian network; network coding; relaying; capacity
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Type
- Article
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Language
- English
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Document Type
- Article
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