DocumentCode :
32774
Title :
Mixed Noisy Network Coding and Cooperative Unicasting in Wireless Networks
Author :
Behboodi, Arash ; Piantanida, Pablo
Author_Institution :
Telecommun. Network Groups, Tech. Univ. Berlin, Berlin, Germany
Volume :
61
Issue :
1
fYear :
2015
fDate :
Jan. 2015
Firstpage :
189
Lastpage :
222
Abstract :
The problem of communicating a single message to a destination in presence of multiple relay nodes, referred to as cooperative unicast network, is considered. First, we introduce mixed noisy network coding (MNNC) scheme which generalizes noisy network coding where relays are allowed to decode-and-forward (DF) messages while all of them (without exception) transmit noisy descriptions of their observations. These descriptions are exploited at the destination and DF relays aim to decode the transmitted messages while creating full cooperation among the nodes. Moreover, the destination and DF relays can independently select the set of descriptions to be decoded or treated as interference. This concept is further extended to multihopping scenarios, referred to as layered MNNC, where DF relays are organized into disjoint groups representing one hop in the network. For cooperative unicast additive white Gaussian noise (AWGN) networks, we show that-provided DF relays are properly chosen-MNNC improves over all previously established constant gaps to the cut-set bound. Second, we consider the composite cooperative unicast network where the channel parameters are randomly drawn before communication starts and remain fixed during the transmission. Each draw is assumed to be unknown at the source and fully known at the destination but only partly known at the relays. We introduce through MNNC scheme the concept of selective coding strategy (SCS) that enables relays to decide dynamically whether, in addition to communicate noisy descriptions, is possible to decode and forward messages. It is demonstrated through slow-fading AWGN relay networks that SCS clearly outperforms conventional coding schemes.
Keywords :
AWGN channels; cooperative communication; decode and forward communication; fading channels; network coding; relay networks (telecommunication); DF relays; MNNC scheme; cooperative unicast additive white Gaussian noise networks; cooperative unicasting; decode-and- forward messages; mixed noisy network coding scheme; multiple relay nodes; selective coding strategy concept; slow-fading AWGN relay networks; wireless networks; Artificial neural networks; Decoding; Encoding; Network coding; Noise measurement; Relays; Unicast; Cooperative unicasting; composite channel; compute-and-forward; constant gap; decode-and-forward; noisy network coding; outage capacity; quantize-map-and-forward; quantize-map-andforward; wireless networking;
fLanguage :
English
Journal_Title :
Information Theory, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9448
Type :
jour
DOI :
10.1109/TIT.2014.2368564
Filename :
6949673
Link To Document :
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