When analog meets digital: Source-Encoded Physical-Layer Network Coding

We revisit Physical-Layer Network Coding (PLNC) in order to integrate this interference management technique in multi-hop wireless networks. We identify its strong coupling to the Two-Way Relay Channel (TWRC) as a main reason preventing it from becoming a staple in large networks. We introduce SE-PL...

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Veröffentlicht in:Pervasive and mobile computing Jg. 58; S. 101021 - 21
Hauptverfasser: Naves, Raphaël, Jakllari, Gentian, Khalifé, Hicham, Conan, Vania, Beylot, André-Luc
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Elsevier B.V 01.08.2019
Elsevier
Schlagworte:
Computer Science
Multi-hop wireless networks
Physical-Layer Network Coding
Physical-Layer Network Coding
Multi-hop wireless networks
ISSN:1574-1192, 1873-1589
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Zusammenfassung:We revisit Physical-Layer Network Coding (PLNC) in order to integrate this interference management technique in multi-hop wireless networks. We identify its strong coupling to the Two-Way Relay Channel (TWRC) as a main reason preventing it from becoming a staple in large networks. We introduce SE-PLNC (Source-Encoded PLNC), a new PLNC scheme that is traffic pattern independent and involves coordination only among one-hop neighbors, making PLNC significantly more practical to adopt in multi-hop wireless networks. To accomplish this, SE-PLNC introduces three innovations: it combines bit-level with physical-level network coding, it shifts most of the coding burden from the relay to the source of the PLNC scheme, and it leverages multi-path relaying opportunities available to a particular traffic flow. We evaluate SE-PLNC using proof-of-concept implementation on a Universal Software Radio Peripherals (USRP) testbed, theoretical analysis, and simulations. Testbed experiments show its real-life feasibility over a wide range of different channel conditions. The theoretical analysis highlight the scalability of SE-PLNC and its efficiency in large ad-hoc networks while large-scale simulations show that SE-PLNC improves network throughput by over 30% compared to state-of-the-art PLNC schemes.
ISSN:1574-1192
1873-1589
DOI:10.1016/j.pmcj.2019.05.002