Layered Orthogonal Frequency Division Multiplexing With Index Modulation

Li, Jun; Dang, Shuping; Wen, Miaowen; Jiang, Xueqin; Peng, Yuyang; Hai, Han

doi:10.1109/jsyst.2019.2918068

Cited by 99 publications

(56 citation statements)

References 38 publications

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“…Thus, OFDM-IM achieves higher energy efficiency and reliability than the classical OFDM especially when it operates at a low bit rate. Therefore, OFDM-IM has attracted a great deal of attention from researchers as shown in recent surveys [3]- [7]. In [5], two enhanced OFDM-IM schemes are proposed, where I-and Q-dimensions are jointly exploited for IM and linear constellation precoding is used for higher spectral efficiency and diversity gain.…”

Section: Introductionmentioning

confidence: 99%

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On the Phase Sequences and Permutation Functions in the SLM Scheme for OFDM-IM Systems

Kim

2020

IEEE Access

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In orthogonal frequency division multiplexing with index modulation (OFDM-IM), the active subcarriers can convey information bits by modulated symbols as well as their indices. OFDM-IM has attracted a great deal of attention from researchers by virtue of high energy efficiency. Unfortunately, OFDM-IM has inherited large peak-to-average power ratio (PAPR) of the classical OFDM signal, but there are few works dealing with it. Selected mapping (SLM) is a promising PAPR reduction technique that is distortionless, has good PAPR reducing capability, and can be easily adapted in OFDM-IM systems. In SLM for OFDM-IM systems, the phase sequences rotate the OFDM-IM block in the frequency domain before the inverse fast Fourier transform (IFFT) is applied. Also, in the recent work, permutation procedure in the frequency domain has been proposed before multiplication of phase sequences in SLM, which is newly introduced in OFDM-IM regime. Unfortunately, the theoretical investigation on the efficiency of the permutation in SLM is insufficient. In this paper, we investigate the phase sequence set (PSS) and permutation functions in the SLM scheme for OFDM-IM systems; First, the efficiency of the permutation is analyzed as a function of the number of active subcarriers. Second, the optimal conditions for the PSS and permutation functions are derived, which is verified through simulations. INDEX TERMS Index modulation (IM), orthogonal frequency division multiplexing (OFDM), peak-toaverage power ratio (PAPR), permutation, phase sequence, selected mapping (SLM).

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Section: Introductionmentioning

confidence: 99%

“…In [6], multiple-mode OFDM-IM is proposed to improve the spectral efficiency by conveying information through multiple distinguishable modes (signal constellations). In [7], the active subcarriers are selected in a layer-wise manner, which increases the length of IM bits and spectral efficiency.…”

Section: Introductionmentioning

confidence: 99%

On the Phase Sequences and Permutation Functions in the SLM Scheme for OFDM-IM Systems

Kim

2020

IEEE Access

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“…Note that we quantify the computational complexity via the number of multiplications for the proposed low-complexity detection. Accordingly, determining a single element L(p, n) needs ∑ K k=1 (k + 1)M k C(K, k) multiplications and thus identifying all elements in L by (7) needs N (K +1) k) multiplications. Therefore, the total number of multiplications for the proposed low-complexity detection in IM-MA is (N K +N +1) k).…”

Section: B Complexity Analysismentioning

confidence: 99%

Low-Complexity Detection for Index Modulation Multiple Access

Dang

et al. 2020

IEEE Wireless Commun. Lett.

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Index modulation multiple access (IM-MA) is recently proposed to exploit the IM concept to the uplink multiple access system, where multiple users transmit their own signals via the selected time slots. However, the computational complexity of the optimal maximum-likelihood (ML) detection in IM-MA is tremendously high when the number of users or time slots is large. In this letter, we propose a low-complexity detection method for IM-MA, which is inspired by the log likelihood ratio (LLR) algorithm. In addition, because of the heavy search burden for all LLR values, we further propose a suboptimal method to determine the permutation set, which records the number of users allocated to each time slot. Simulation results and the complexity analysis verify that the proposed detection performs closely to the optimal ML detection with reduced computational complexity.

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“…It is worth noting that in previous studies, signal symbols have been rotated prior to transmission to achieve higher spectral efficiency and diversity gain [32,33].…”

Section: Spatial Modulationmentioning

confidence: 99%

On the performance of improved quadrature spatial modulation

et al. 2020

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Quadrature spatial modulation (QSM) utilizes the in‐phase and quadrature spatial dimensions to transmit the real and imaginary parts of a single signal symbol, respectively. The improved QSM (IQSM) transmits two signal symbols per channel use through a combination of two antennas for each of the real and imaginary parts. The main contributions of this study can be summarized as follows. First, we derive an upper bound for the error performance of the IQSM. We then design constellation sets that minimize the error performance of the IQSM for several system configurations. Second, we propose a double QSM (DQSM) that transmits the real and imaginary parts of two signal symbols through any available transmit antennas. Finally, we propose a parallel IQSM (PIQSM) that splits the antenna set into equal subsets and performs IQSM within each subset using the same two signal symbols. Simulation results demonstrate that the proposed constellations significantly outperform conventional constellations. Additionally, DQSM and PIQSM provide a performance similar to that of IQSM while requiring a smaller number of transmit antennas and outperform IQSM with the same number of transmit antennas.

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Layered Orthogonal Frequency Division Multiplexing With Index Modulation

Cited by 99 publications

References 38 publications

On the Phase Sequences and Permutation Functions in the SLM Scheme for OFDM-IM Systems

On the Phase Sequences and Permutation Functions in the SLM Scheme for OFDM-IM Systems

Low-Complexity Detection for Index Modulation Multiple Access

On the performance of improved quadrature spatial modulation

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