Non-orthogonal packet access based on low density signature with phase only adaptive precoding

Satoshi Denno, Ryoko Sasaki, Yafei Hou

Research output: Contribution to journalArticlepeer-review

Abstract

This paper proposes non-orthogonal packet access based on low density signature with phase only adaptive precoding. The proposed access allows multiple user terminals to send their packets simultaneously for implementing massive connectivity, though only one antenna is put on every terminal and on an access point. This paper proposes a criterion that defines the optimum rotation angles for the phase only precoding, and an algorithm based on the steepest descent to approach the optimum rotation angles. Moreover, this paper proposes two complexity-reduced algorithms that converge much faster than the original algorithm. When 6 packets are transmitted in 4 time slots, i.e., overloading ratio of 1.5, the proposed adaptive precoding based on all the proposed algorithms attains a gain of about 4 dB at the BER of 10−4 in Rician fading channels.

Original languageEnglish
Pages (from-to)328-336
Number of pages9
JournalIEICE Transactions on Communications
VolumeE104B
Issue number3
DOIs
Publication statusPublished - Mar 1 2021

Keywords

  • Log-likelihood ratio
  • MPA
  • Non-orthogonal access
  • Precoding
  • Steepest descent

ASJC Scopus subject areas

  • Software
  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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