Implementation of Non Linear Companding Technique for Reducing PAPR of OFDM

Madhavi, D.; Patnaik, M. Ramesh

doi:10.1016/j.matpr.2017.11.159

Cited by 9 publications

(4 citation statements)

References 8 publications

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“…The companding function can be used to maintain the signal's average power constant. The most common types of NCT include exponential, A-law, µ -law, and rooting compensating techniques (RCT) [40][41][42][43]. The work's originality is based on two key aspects.…”

Section: Severalmentioning

confidence: 99%

Non-Linear Companding Techniques With Aco-Ofdm-Based VLC Systems for Papr Reduction

Khalaf

Elnabawy

Azzam

2023

Journal of Advanced Engineering Trends

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In visible light communication (VLC) systems, optical orthogonal frequency division multiplexing (OOFDM) is used to reduce the effects of inter-symbol interference while simultaneously achieving fast data transmission speeds and large bandwidths. Asymmetrically clipped optical orthogonal frequency division multiplexing (ACO-OFDM) is one of the most OOFDM used. ACO-OFDM with low peak-to-average power ratio performance becomes essential for practical visible light communication broadcasting systems due to non-linearity elimination. The techniques for reducing the peak-to-average power ratio for visible light communication broadcasting systems are designed, simulated, and evaluated in this work. This work provides novel mixed Non-Liner Companding Techniques that target remarkable peak-toaverage power ratio performance with acceptable bit error rate performance for ACO-OFDMbased VLC systems. This work compares the designed techniques then nominates an optimum one that provides the optimum peak-to-average power ratio and bit error rate performance. Finally, the nominated technique will be compared to all related literatuers of ACO-OFDM-based VLC systems to ensure its novelty, validity, and effectiveness.

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Section: Severalmentioning

confidence: 99%

Non-Linear Companding Techniques With Aco-Ofdm-Based VLC Systems for Papr Reduction

Khalaf

Elnabawy

Azzam

2023

Journal of Advanced Engineering Trends

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“…is an expectation operation. Consider a MIMO FBMC/OQAM system that use 'i' transmitting antennas and 'j' sub-carriers [20]. Then PAPR is expressed [12], [13] as,…”

Section: Mimo Papr Measure In Fbmc/oqam Systemmentioning

confidence: 99%

Performance improvement on spectral efficiency and peak to avearge power reduction for 5G system

Kavitha

Raju²,

Pujali

2022

IJEECS

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<span>Filter bank multicarrier with offset quadrature amplitude modulation (FMBC/OQAM) system which can offer higher data rate 1 Gbps and improved bandwidth efficiency because of not require of cyclic prefix (CP) to avoid interference from the adjacent channels compared to fourth generation (4G) orthogonal frequency division multiplexing (OFDM) and other wireless systems. Because of these advantages FBMC/OQAM are used in fifth generation (5G) technology. In this FBMC/OQAM system, bandwidth capacity will be further increased by using multiple input multiple output (MIMO) channel. But in our proposed scheme we can use hyper–MIMO channel, in which at base station (BS) more number of transmitting antennas are used that for the improve the spectral efficiency performance better than traditional MIMO channel. But the most important drawback of hyper MIMO FBMC/OQAM is the higher peak to average-power ratio (PAPR) that degrade overall system performance in 5G. In 4G technology, to reduce PAPR a number of techniques are used. In our proposed system we can use mu-law non-linear companding technique and precoding discrete cosine transform (DCT) to reduce PAPR value for multicarrier modulation system compare to other systems.</span>

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“…Please note that the first paragraph of a section or subsection is not A lot of latest wireless standards have been using OFDM as a communication form of multicarrier modulation technique [1][2][3][4][5][6]. A lot of broadcast levels for example 3GPP, Digital Video Broadcasting (DVB) standards, Digital Audio Broadcasting (DAB) standards, Terrestrial Digital Video Broadcasting (DVB-T) and smart grid system have been implementing in this system [1,7].…”

Section: Introductionmentioning

confidence: 99%

PAPR Reduction of OFDM System Using Selective Mapping (SLM) and Firefly Algorithm (FA)

Qamarina

Wahab

Othman

et al. 2021

Lecture Notes in Electrical Engineering

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Orthogonal Frequency Division Multiplexing (OFDM) is an encoding method that are hugely utilized in wireless communication due to its high number of advantages such as tolerance for multipath delay spread, frequency selective fading channels immune and also power efficiency. The bad side of this method is it has high Peak Average Power Ratio (PAPR) that will generate nonlinear distortions and severe power penalty. In this research, Selective Mapping (SLM) method is proposed to solve the problem of high PAPR but from previous researches, it could be seen that in SLM, the search complexity increases as the number of phase sequence increase. To solve this issue, Firefly Algorithm (FA) is applied to optimize the function of SLM. The modulation method used is Quadrature Phase Shift Keying (QPSK). By the end of the process, CCDF and BER plots are computed. The performance of PAPR reduction in OFDM system are analyzed by different number of subcarriers, phase sequences, randomization parameters and iterations using CCDF graphs. The performance of OFDM channel through AWGN channel is studied with different number of subcarriers. By using SLM method only, the PAPR values manage to be reduced by 0.4-3 dB but with FA-SLM algorithm, the PAPR values can be reduced by 5-9.5 dB. With these results, it is concluded that the combination of SLM with FA can help to improve computational complexity in SLM and eventually reduce PAPR value in OFDM system.

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Implementation of Non Linear Companding Technique for Reducing PAPR of OFDM

Cited by 9 publications

References 8 publications

Non-Linear Companding Techniques With Aco-Ofdm-Based VLC Systems for Papr Reduction

Non-Linear Companding Techniques With Aco-Ofdm-Based VLC Systems for Papr Reduction

Performance improvement on spectral efficiency and peak to avearge power reduction for 5G system

PAPR Reduction of OFDM System Using Selective Mapping (SLM) and Firefly Algorithm (FA)

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