Design of Coded Slotted ALOHA Operated with q-Ary Physical-Layer Network Coding

We study a physical-layer network coding (PNC) enhanced slotted ALOHA (SA) scheme. At the transmitters, practical q -ary modulation codes (a practical lattice code) and contention resolution diversity SA (CRDSA) protocol are utilized, where active users send replicas of their coded-modulated message...

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Bibliographic Details
Published inICC 2023 - IEEE International Conference on Communications pp. 5328 - 5333
Main Authors Yang, Tao, Ren, Wencheng, Yu, Fangtao
Format Conference Proceeding
LanguageEnglish
Published IEEE 28.05.2023
Subjects
Codes
compute-forward
grant-free random access
lattice codes
Lattices
mMTC
Modulation
Network coding
physical-layer network coding
Protocols
Receivers
Slotted ALOHA
Transmitters
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Summary:We study a physical-layer network coding (PNC) enhanced slotted ALOHA (SA) scheme. At the transmitters, practical q -ary modulation codes (a practical lattice code) and contention resolution diversity SA (CRDSA) protocol are utilized, where active users send replicas of their coded-modulated messages in randomly selected slots. At the receiver, q-ary linear PNC is employed to compute L network-coded messages (or linear message combinations), which can be regarded as a practical embodiment of compute-forward and lattice decoding. Upon collecting a sufficient number of network-coded messages, the receiver carries out generalized matrix inversion to recover a subset of all active users' messages. Numerical results demonstrate dramatically increased throughput performance by as much as 80%, as well as advances in the trade-offs among system load, latency and energy efficiency.
ISSN:1938-1883
DOI:10.1109/ICC45041.2023.10278882