A Low Complexity Two-Stage LLR Detector for Downlink OFDM-IM NOMA

OFDM-IM based Non-Orthogonal Multiple Access is a recently developed scheme, where flexibility is provided by both NOMA and OFDM-IM with an adjustable power allocation coefficient and an adjustable subcarrier activation ratio, respectively. However, the computational complexity of the Maximum Likeli...

Full description

Saved in:
Bibliographic Details
Published inIEEE communications letters Vol. 26; no. 10; pp. 2247 - 2251
Main Authors Sabud, Subham, Kumar, Preetam
Format Journal Article
LanguageEnglish
Published New York IEEE 01.10.2022
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Complexity
Detectors
Frequency-domain analysis
Index modulation (IM)
Indexes
Likelihood ratio
LLR detector
ML detector
NOMA
Nonorthogonal multiple access
OFDM
Orthogonal Frequency Division Multiplexing
Receivers
Symbols
Online AccessGet full text

Cover

More Information
Summary:OFDM-IM based Non-Orthogonal Multiple Access is a recently developed scheme, where flexibility is provided by both NOMA and OFDM-IM with an adjustable power allocation coefficient and an adjustable subcarrier activation ratio, respectively. However, the computational complexity of the Maximum Likelihood (ML) detector, used in the OFDM-IM NOMA scheme is very high. In this letter, a low complexity "two-stage Log-Likelihood Ratio (LLR)" detector is proposed for the OFDM-IM NOMA scheme. Computer simulation results and complexity analysis verify that the proposed detector performs almost the same as the ML-based detector in all the various conditions, with much reduced computational complexity.
ISSN:1089-7798
1558-2558
DOI:10.1109/LCOMM.2022.3194824