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Seek and decode: Random access with physical‐layer network coding and multiuser detection
Author(s) -
Cocco Giuseppe,
Pfletschinger Stephan,
Navarro Monica
Publication year - 2017
Publication title -
transactions on emerging telecommunications technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.366
H-Index - 47
ISSN - 2161-3915
DOI - 10.1002/ett.3129
Subject(s) - aloha , computer science , random access , linear network coding , network packet , physical layer , decoding methods , computer network , fading , multiuser detection , frame (networking) , capture effect , coding (social sciences) , throughput , real time computing , wireless , algorithm , telecommunications , code division multiple access , statistics , mathematics
We present a novel scheme for Slotted ALOHA random access systems that combines physical‐layer network coding (PLNC) with multiuser detection (MUD). The PLNC and MUD are applied jointly at the physical layer to be able to extract any linear combination of messages experiencing a collision within a slot. The set of combinations extracted from a whole frame is then processed by the receiver to recover the original packets. A simple precoding stage at the transmitting terminals allows the receiver to further decrease the packet loss rate. We present results for the decoding at the physical layer as well as several performance measures at frame level, namely, throughput, packet loss rate, and energy efficiency. The results we present are promising and suggest that a cross‐layer approach leveraging on the joint use of PLNC and MUD can significantly improve the performance of random access systems in the presence of slow fading.