LLR calculation based on interference cancelation for non-orthogonal multiple access

Yuji Chida; Yukitoshi Sanada

doi:10.1109/VTCSpring.2014.7022974

LLR calculation based on interference cancelation for non-orthogonal multiple access

Yuji Chida, Yukitoshi Sanada

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

Non-orthogonal multiple access improves spectral efficiency through sharing the same frequency resource with multiple wireless terminals. In the previous researches, it has been shown that a log likelihood ratio (LLR) calculated from a signal on the sharing spectrum should be masked to zero if the power of an interference signal is stronger than that of a desired signal. This implies that the spectrum is not shared by the terminal receiving the weaker signal. In this paper, a spectrum sharing scheme on the basis of interference cancelation and a LLR calculation with the probability density function of residual interference is proposed. Numerical results obtained thorough computer simulation show that the proposed scheme improves the performance by 1 dB at the BER of 10^-4 as compared to that of the conventional scheme.

Original language	English
Article number	7022974
Journal	Unknown Journal
Volume	2015-January
Issue number	January
DOIs	https://doi.org/10.1109/VTCSpring.2014.7022974
Publication status	Published - 2014

ASJC Scopus subject areas

Computer Science Applications
Applied Mathematics
Electrical and Electronic Engineering

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AU - Sanada, Yukitoshi

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AB - Non-orthogonal multiple access improves spectral efficiency through sharing the same frequency resource with multiple wireless terminals. In the previous researches, it has been shown that a log likelihood ratio (LLR) calculated from a signal on the sharing spectrum should be masked to zero if the power of an interference signal is stronger than that of a desired signal. This implies that the spectrum is not shared by the terminal receiving the weaker signal. In this paper, a spectrum sharing scheme on the basis of interference cancelation and a LLR calculation with the probability density function of residual interference is proposed. Numerical results obtained thorough computer simulation show that the proposed scheme improves the performance by 1 dB at the BER of 10-4 as compared to that of the conventional scheme.

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LLR calculation based on interference cancelation for non-orthogonal multiple access

Abstract

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