Multiple-Mode Orthogonal Frequency Division Multiplexing With Index Modulation

Orthogonal frequency division multiplexing with index modulation (OFDM-IM) performs transmission by considering two modes over OFDM subcarriers, which are the null and the conventional M-ary signal constellation. The spectral efficiency (SE) of the system, however, is limited, since the null mode it...

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Bibliographic Details
Published in:IEEE transactions on communications 2017-09, Vol.65 (9), p.3892-3906
Main Authors: Miaowen Wen, Basar, Ertugrul, Qiang Li, Beixiong Zheng, Meng Zhang
Format: Article
Language:English
Subjects:
Amplitudes
Bandwidths
Bit error rate
bit error rate (BER)
Computer simulation
Constellation diagram
Constellations
Error analysis
Error detection
Fiber optic networks
Frequency shift keying
in-phase/quadrature components
index modulation
Indexes
log-likelihood ratio (LLR)
maximum-likelihood (ML)
Modal choice
OFDM
Orthogonal Frequency Division Multiplexing
Permutations
Phase shift keying
Pulse amplitude modulation
Quadrature amplitude modulation
Subcarriers
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Summary:Orthogonal frequency division multiplexing with index modulation (OFDM-IM) performs transmission by considering two modes over OFDM subcarriers, which are the null and the conventional M-ary signal constellation. The spectral efficiency (SE) of the system, however, is limited, since the null mode itself does not carry any information and the number of subcarrier activation patterns increases combinatorially. In this paper, a novel IM scheme, called multiple-mode OFDM-IM (MM-OFDM-IM), is proposed for OFDM systems to improve the SE by conveying information through multiple distinguishable modes and their full permutations. A practical and efficient mode selection strategy, which is constrained on the phase shift keying/quadrature amplitude modulation constellations, is designed. Two efficient detectors that provide different tradeoffs between the error performance and detection complexity are also proposed. The principle of MM-OFDM-IM is further extended to the in-phase and quadrature components of OFDM signals, and the method of generating multiple modes from the M-ary pulse amplitude modulation constellation for this modified scheme is also introduced. Bit error rate (BER) analyses are provided for the proposed schemes. Monte Carlo simulations on BER corroborate the analyses and show that the proposed schemes appear as promising multi-carrier transmission alternatives by outperforming the existing OFDM-IM counterparts.
ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2017.2710312