Enhanced OFDM-NOMA for next generation wireless communication: A study of PAPR reduction and sensitivity to CFO and estimation errors

Trivedi, Vinay Kumar; Ramadan, Khaled; Kumar, Preetam; Dessouky, Moawad I.; El‐Samie, Fathi E. Abd

doi:10.1016/j.aeue.2019.01.009

Cited by 65 publications

(38 citation statements)

References 32 publications

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“…In [4] the demands of 5G wireless communication are listed. A multicarrier scheme like OFDM in view of Non-Orthogonal Multiple Access (NOMA) for 5G experiences high PAPR and affectability to CFO.…”

Section: Literature Reviewmentioning

confidence: 99%

Performance Enhancement of Bit Error Rate with Increased Capacity using Modified SIC-MUD for Polar Code based OFDM-IDMA System for 5G

2019

IJITEE

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 Abstract: In the era of mobile data revolution there is a mass-market of smart phones culminating into an extensive growth in mobile services and applications. However, bandwidth is limited and valuable resource available. In this paper hybrid combination of OFDM-IDMA system is proposed using polar code as forward error correction code and Gold code based interleaver. It presents a method to improvebit error rate with 10 users and normalizedcarrier frequency offsets of 0.1 to 0.5.The simulation is done in the presence of Rayleigh and AWGN channel with 64 QAM modulation technique. A modified successive interference cancellation multi-user detection algorithm is proposed to cater multiple access interference.It is observed that proposed system withnormalized CFO of 0.1 for10 users at required SNR of 15 dB enhances the bit error rate to 1.021*10-4over available existing systems. Hence the capacity of the system and data rate increases by three times to support multimedia application within available bandwidth.

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Section: Literature Reviewmentioning

confidence: 99%

Performance Enhancement of Bit Error Rate with Increased Capacity using Modified SIC-MUD for Polar Code based OFDM-IDMA System for 5G

2019

IJITEE

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“…Accurate estimation of parameters such as channel coefficients and CFO is vital at the receiver, and therefore, the performance evaluation of the proposed scheme is also important in the presence of EEs. Recently, in the work of Trivedi et al, for the performance enhancement of inverse fast fourier transform (IFFT)/FFT‐based OFDM‐NOMA, the precoding techniques have been discussed with PAPR and BER results with a low‐complexity equalization and CFO compensation scheme have been estimated. In the second part of this paper, we extend the work of Trivedi et al with trigonometric transforms as discussed in more details in Section 2.6.…”

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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“…In this paper, we aim to improve the underwater acoustic (UWA) BER system performance by using orthogonal frequency division multiplexing (OFDM) based on fast Walsh-Hadamard transform (FWHT) instead off fast Fourier transform (FFT). 13,14 There are different algorithms used for CFO estimations such as in previous works. 9 The PAPR results from the limited range of the power amplifier; moreover, the PAPR increases as the number of subcarriers increased.…”

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confidence: 99%

“…There are different algorithms used for PAPR reduction such as in previous studies. 13,14 There are different algorithms used for CFO estimations such as in previous works. 12 The CFO induces intercarrier interference (ICI), which destroys the orthogonality and consequently degradation in the biterror-rate (BER) performance.…”

mentioning

confidence: 99%

“…12 The CFO induces intercarrier interference (ICI), which destroys the orthogonality and consequently degradation in the biterror-rate (BER) performance. 13,14 There are different algorithms used for CFO estimations such as in previous works. [15][16][17][18][19] The OFDM system lies in its simplicity by using a frequency domain equalizer (FDE) at the receiver side to mitigate the intersymbol interference (ISI) effect and improve the system performance.…”

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Performance enhancement of UWA‐OFDM communication systems based on FWHT

El-Mahallawy

Eldien

2019

Int J Communication

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The available bandwidth of underwater environment tends to several kilohertz, which considers the main challenges of communications under sea water. On the other hand, the bit-error-rate (BER) performance degrades because of several reasons such as multipath propagation, time variabilities of the channel, attenuation, and water temperature. In this paper, we aim to improve the underwater acoustic (UWA) BER system performance by using orthogonal frequency division multiplexing (OFDM) based on fast Walsh-Hadamard transform (FWHT) instead off fast Fourier transform (FFT). We proposed a low-complexity equalization and carrier frequency offset (CFO) compensation for UWA-OFDM-based FWHT using banded-matrix approximation concept.Simulation results show that the UWA-OFDM-based FWHT with lowdensity parity check (LDPC) codes give a good improvement performance compared with traditional OFDM in UWA system especially in case of estimation errors.peak-to-average power ratio (PAPR) at the transmitter side 8 and the carrier frequency offset (CFO) at the receiver side. 9 The PAPR results from the limited range of the power amplifier; moreover, the PAPR increases as the number of subcarriers increased. There are different algorithms used for PAPR reduction such as in previous studies. [8][9][10][11] On the other hand, the CFO results from the relative motion of the transmitter and/or receiver (Doppler effect). 12 The CFO induces intercarrier interference (ICI), which destroys the orthogonality and consequently degradation in the biterror-rate (BER) performance. 13,14 There are different algorithms used for CFO estimations such as in previous works. [15][16][17][18][19] The OFDM system lies in its simplicity by using a frequency domain equalizer (FDE) at the receiver side to mitigate the intersymbol interference (ISI) effect and improve the system performance. In the same time, we modify the OFDM system by replacing the inverse fast Fourier transform (IFFT) and fast Fourier transform (FFT) by inverse fast Walsh-Hadamard transform (IFWHT) and fast Walsh-Hadamard transform (FWHT), respectively. Replacing the FWHT/IFWHT with FFT/IFFT has been introduced in wireless radio communications, 20 which can improve the system performance. 20 But this modification requires an FFT and IFFT block to implement the FDE and enhance the system performance when compared with traditional OFDM system. On the other hand, implementation of the FWHT requires fewer computations (it omits the FFT's twiddle factors), and implement on smaller and cheaper hardware can be used to improve the performance of the UWA communication system and give better data transmission. 21 The FWHT transform can be implemented with lower complexity, due to its operation that is built on the subtraction and addition operations, while the FFT transform requires multiplication and division. 22 Also, the FWHT can be used for channel estimation with lower complexity. 22 Yang and Yang 23 show that the FWHT can be highly attentive to deal with the UWA channel impairments, and it is bu...

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Enhanced OFDM-NOMA for next generation wireless communication: A study of PAPR reduction and sensitivity to CFO and estimation errors

Cited by 65 publications

References 32 publications

Performance Enhancement of Bit Error Rate with Increased Capacity using Modified SIC-MUD for Polar Code based OFDM-IDMA System for 5G

Performance Enhancement of Bit Error Rate with Increased Capacity using Modified SIC-MUD for Polar Code based OFDM-IDMA System for 5G

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

Performance enhancement of UWA‐OFDM communication systems based on FWHT

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