A Novel Waveform for Massive Machine-Type Communications in 5G

Yang, Fan; Wang, Xin

doi:10.1109/wcnc.2017.7925589

Cited by 5 publications

(1 citation statement)

References 8 publications

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“…The DFT precoding in SC‐FDMA results in low PAPR with improved BER performance because of the frequency diversity gain through spreading. Other precoding techniques or matrices are also studied for the PAPR reduction in OFDM systems, ie, WH transform in the work of Park et al, ZC sequences in the work of Baig and Jeoti, DCT in the work of Baig, DST in the work of Baig et al, DHT in the work of Baig, and CI codes in the work of Yang and Wang . In Section 3 of our work, precoding techniques are compared on the basis of PAPR performances with pulse shaping and some useful insights about roll‐off factor, the number of taps required to implement transmit filter, excess bandwidth required, efficiency, and implementation cost of transmit filter.…”

Section: Introductionmentioning

confidence: 99%

Trigonometric transforms and precoding strategies for OFDM‐based uplink hybrid multi‐carrier nonorthogonal multiple access

Trivedi

Ramadan

Kumar

et al. 2019

Trans Emerging Tel Tech

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An uplink hybrid nonorthogonal multiple access (h-NOMA) scheme utilizing power domain multiplexing is adopted in this paper for orthogonal frequencydivision multiplexing (OFDM)-based systems. The OFDM-based NOMA systems can achieve high spectral efficiency with resilience to wireless multipath fading. The h-NOMA maintains a low interference level per resource block or low complexity of multiuser detection (MUD) implementation at the receiver and also achieves consistent fairness performance by restricting the maximum number of users per resource block. An improved user clustering algorithm for OFDM-based h-NOMA system under the assumption of user's distinct data rate requirement is presented here. The proposed algorithm takes into consideration both the channel gain of all activated users and the different data rate requirements of weak channel gain users. High peak-to-average power ratio (PAPR) and performance degradation due to strict frequency synchronization requirements are the main drawbacks of such an OFDM-based uplink h-NOMA system. High PAPR of multicarrier NOMA is addressed here with precoding techniques. An enhanced minimum mean square error (MMSE) receiver performing joint equalization and carrier frequency offset (CFO) compensation using low-complexity banded-matrix implementation is proposed to cancel interference in the frequency domain. The MUD is implemented with low-complexity successive interference cancellation (SIC) using bandedmatrix approximation of the interference matrix in the presence of CFO. Moreover, the possibility of utilizing efficient trigonometric transforms to implement OFDM-based NOMA is studied with CFO and estimation errors. For OFDM-based h-NOMA system, an efficient combination of different trigonometric transform configurations to constitute the multicarrier basis for OFDM with a suitable precoding strategy for PAPR reduction is studied.Trans Emerging Tel Tech. 2019;30:e3694.wileyonlinelibrary.com/journal/ett

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Section: Introductionmentioning

confidence: 99%

Trigonometric transforms and precoding strategies for OFDM‐based uplink hybrid multi‐carrier nonorthogonal multiple access

Trivedi

Ramadan

Kumar

et al. 2019

Trans Emerging Tel Tech

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Performance improvement of data transmission using a hybrid underwater and terrestrial system

Ramadan

Taha

Dessouky

et al. 2021

Trans Emerging Tel Tech

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In this paper, we investigate and enhance the performance of data transmission using a hybrid underwater and terrestrial system with low‐complexity linear equalization. Due to the low speed, salinity, water depth, pH degree, and water temperature variations, underwater acoustic communication has become one of the most challenging technologies in the world. The most common linear equalizers are the Linear Zero Forcing (LZF), and Linear Minimum Mean Square Error (LMMSE) equalizers. The LZF equalizer suffers from the noise enhancement problem, while the LMMSE equalizer requires the value of the operating Signal‐to‐Noise Ratio (SNR) to work, correctly, which increases the computational complexity. In addition, this paper presents a low‐complexity equalization scheme to overcome the drawbacks associated with the LZF, and LMMSE equalizers. The proposed equalizer is called the Joint Low‐Complexity Regularized LZF equalizer, which depends on a fixed regularization parameter to minimize the noise enhancement phenomenon caused by the LZF equalizer. The proposed equalizer does not need the estimation of the SNR, and the computational complexity is reduced due to the utilization of the banded‐matrix approximation. The proposed equalizer is implemented based on the Single‐Input‐Single‐Output configuration for Orthogonal Frequency Division Multiplexing (OFDM) using the Discrete Cosine Transform. The obtained simulation results show that the proposed equalizer outperforms different equalizers for the same channel conditions.

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A low-complexity transceiver scheme for joint DFT pre-coded DWT SC-FDMA NOMA system under dissimilar power allocation strategies

Subha,

Judson

2024

Sādhanā

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A Novel Waveform for Massive Machine-Type Communications in 5G

Cited by 5 publications

References 8 publications

Trigonometric transforms and precoding strategies for OFDM‐based uplink hybrid multi‐carrier nonorthogonal multiple access

Trigonometric transforms and precoding strategies for OFDM‐based uplink hybrid multi‐carrier nonorthogonal multiple access

Performance improvement of data transmission using a hybrid underwater and terrestrial system

A low-complexity transceiver scheme for joint DFT pre-coded DWT SC-FDMA NOMA system under dissimilar power allocation strategies

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