Enhanced DCT-OFDM System With Index Modulation

He, Chang; Cao, Aijun; Xiao, Lixia; Zhang, Lei; Xiao, Pei; Nikitopoulos, Konstantinos

doi:10.1109/tvt.2019.2893684

Cited by 16 publications

(11 citation statements)

References 18 publications

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“…7 shows the FQSISK ABLER performances compared to OFDM-IM, OFDM-GIM, OFDM-HNIM, and the Enhanced DCT-OFDM system with index modulation (EDCT-OFDM-IM) [45] when a CFO with µ = 0.05 is applied. As the results show, the FQSISK is more robust against ICI than its counterparts, and it outperforms the EDCT-OFDM-IM (8,2,1024) with BPSK, which is considered one of the most robust IM schemes against ICI [45]. Moreover, When subcarrier interleaver [23] is used with FQSISK (IFQSISK) its robustness to ICI is improved as shown in the Fig.…”

Section: Simulation Resultsmentioning

confidence: 99%

Fully Quadrature Subcarrier-Index Shift Keying for Efficient Underwater Acoustic Communications

et al. 2021

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A novel fully quadrature subcarrier-index shift keying orthogonal frequency division multiplexing (FQSISK-OFDM) modulation scheme for underwater acoustic communications (UWAC) is proposed in this paper. In the FQSISK, the data is conveyed by active and non-active OFDM-subcarriers indices. Moreover, the active odd and even subcarriers are marked with separable predefined dummy variables (DV). Herein, the DV ±δ (i.e., it can take any predefined value), and its quadrature ±jδ are exploited to distinguish between active even and odd subcarriers. Hence, the possibility of power leakage from active to non-active subcarriers is reduced, which minimizes the effect of severe UWAC intercarrier-interface (ICI). Moreover, the spectral efficiency of the FQSISK hardly depends on the subcarriers grouping size, which reduces the proposed FQSISK decoder complexity significantly. The simulation results demonstrate the proposed FQSISK superiority, as it achieves higher spectral and energy efficiencies than the plain OFDM and the recently introduced OFDM index modulation (OFDM-IM) techniques. INDEX TERMS OFDM with index modulation (OFDM-IM), underwater acoustic communications, quadrature shift keying, subcarrier-shift keying.

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Section: Simulation Resultsmentioning

confidence: 99%

Fully Quadrature Subcarrier-Index Shift Keying for Efficient Underwater Acoustic Communications

et al. 2021

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“…In this regard, the cyclicprefix (CP) based methods employed in general DFT-OFDM schemes to tackle the ICI and ISI issues do not apply any more. To address this issue, and further improve the DCT-OFDM-IM performance in [15], in this section, the optimum DCT-OFDM transceiver structure proposed in [18], [14], [16] is employed by cooperating with a time-reversed pre-filter and symmetric extended guard sequences to render the effective channel matrix diagonalizable by DCT in frequency domain, where one-tap equalization becomes applicable at the receiver side. In cooperation with this pre-filter, both prefix and suffix at no less than the channel memory are required as guard interval in the form of symmetric extension from modulated signal.…”

Section: Proposed Edct-ofdm-im System Modelmentioning

confidence: 99%

“…Instead of deriving a closed-form expression for Eq. (26), we follow [20], [21], [16] and estimate the UPEPs of Eq. (26) by numerical integration.…”

Section: B Proposed Edct-ofdm-im Receivermentioning

confidence: 99%

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Index Modulation Assisted DCT-OFDM with Enhanced Transceiver Design

Cao

Xiao

et al. 2019

ICC 2019 - 2019 IEEE International Conference on Communications (ICC)

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An index modulation (IM) assisted Discrete Cosine Transform based Orthogonal Frequency Division Multiplexing (DCT-OFDM) with Enhanced Transmitter Design (termed as EDCT-OFDM-IM) is proposed. It amalgamates the concept of Discrete Cosine Transform assisted Orthogonal Frequency Division Multiplexing (DCT-OFDM) and Index Modulation (IM) to exploit the design freedom provided by the double number of available subcarrier under the same bandwidth. In the proposed EDCT-OFDM-IM scheme, the maximum likelihood (ML) detector used for symbol bits and index bits recovering is derived and the sophisticated designing guidelines for EDCT-OFDM-IM are provided. Based on the derived pairwise error event probability, a theoretical upper bound on the average biterror probability (ABEP) of EDCT-OFDM-IM is provided over multipath fading channels. Furthermore, the maximum peak-toaverage power ratio (PAPR) of our proposed EDCT-OFDM-IM scheme is derived and compared to than the general Discrete Fourier Transform (DFT) based OFDM-IM counterpart.

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“…Research of various algorithms on computational complexity reduction in OFDM has been investigating. The performance of Discrete Wavelet Transform (DWT), Double Density Discrete Wavelet Transforms (DDDWT), Discrete Cosine MOD Transform (DCT) that applied to OFDM have been studied in [17]- [24]. Also, the use of various FFT algorithms as 2-radix FFT, 4-radix FFT, Winograd FFT, and the very recent very fast Fourier transform (VFFT) in the OFDM system have been examined in [25]- [29].…”

Section: Introductionmentioning

confidence: 99%

G-OFDM Variants Evaluation for Transmitter and Receiver Implementation

Wirastuti¹,

Noras²

2021

International Journal on Advanced Science, Engineering and Information Technology

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Orthogonal Frequency Division Multiplexing (OFDM) is chosen as a multiplexing technique and broadly used in today's radiocommunication environments to overcome spectrum insufficiency. In current OFDM applications, the IDFT/DFT algorithms are used for modulation and demodulation, efficiently implemented using the IFFT/FTT. The IFFT and FFT are some of the main components of OFDM systems, requiring intensive computation, especially for a high number of sub-channels. Reducing the computational burden of the IFFT/FFT would offer an advantage in reducing the total OFDM system complexity. In this proposed system, the idea of implementing the very fast Fourier transform (VFFT) in OFDM (later, it is called G-OFDM) is based on a trade-off between performance and complexity. The implementation complexity of G-OFDM is lower than OFDM. However, there is a performance cost. G-OFDM has been studied both analytically and in simulation over the AWGN channel. In particular, performance is marred by the non-uniformity of SNR among sub-carriers. In this study, it was proposed two G-OFDM variants called G1-OFDM and G2-OFDM. G1-OFM is the least complex among all G-OFDM scenarios but gives the worst performance, while G2-OFDM gives the best performance but is the most complex. The results show that the performance of G-OFDM and its variants can be improved through the application of different values of n-quantization levels. In other words, using n-quantization levels, we can decrease the processing loss of the G system.

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Enhanced DCT-OFDM System With Index Modulation

Cited by 16 publications

References 18 publications

Fully Quadrature Subcarrier-Index Shift Keying for Efficient Underwater Acoustic Communications

Fully Quadrature Subcarrier-Index Shift Keying for Efficient Underwater Acoustic Communications

Index Modulation Assisted DCT-OFDM with Enhanced Transceiver Design

G-OFDM Variants Evaluation for Transmitter and Receiver Implementation

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