Random Spreading for Unsourced MAC With Power Diversity

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

Abstract

We propose an improvement of the random spreading approach with polar codes for unsourced multiple access, for which each user first encodes its message by a polar code, and then the coded bits are spread using a random spreading sequence. The proposed approach divides the active users into different groups, and employs different power levels for each group in such a way that the average power constraint is satisfied. We formulate and solve an optimization problem to determine the number of groups, and the corresponding user numbers and power levels. Extensive simulations show that the proposed approach outperforms the existing methods, especially when the number of active users is large.

Details

Original languageEnglish
Article number9567667
Pages (from-to)3995-3999
Number of pages5
JournalIEEE Communications Letters
Volume25
Issue number12
Publication statusPublished - 1 Dec 2021
Peer-reviewedYes

External IDs

Scopus 85117265777

Keywords

Keywords

  • Complexity theory, Decoding, Detectors, Iterative decoding, Optimization, Polar codes, Silicon carbide