PAPR reduction and non-linearity alleviation using hybrid of precoding and companding in a visible light communication (VLC) system

Sharan, Nishant; Ghorai, S.K.

doi:10.1007/s11082-020-02426-1

Cited by 19 publications

(25 citation statements)

References 17 publications

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“…However, the solution is impractical because it uses inflection point and side information data as PLC. Finally, Square root Raised Cosine-based precoding was hybridized with

-law (SRC-

) in [ 36 , 37 ] without compared to the previous precoding-companding techniques.…”

Section: Introductionmentioning

confidence: 99%

“…The limitations of the discussed works are summarized as follows: The authors in [ 22 , 24 , 27 , 28 , 30 , 32 , 33 , 34 , 36 , 37 ] hybridized

-law with different precoding matrices due to its high PAPR reduction gain. However, BER and OOB radiation are more important metrics than PAPR reduction gain when working with PAPR reduction techniques that cause BER degradation, such as companding techniques.…”

Section: Introductionmentioning

confidence: 99%

“…However, piecewise based companding techniques are impractical. Many precoding-companding techniques [ 26 , 29 , 31 , 36 , 37 ], are not compared with any previous works. HPA was neglected in the models [ 22 , 26 , 27 , 28 , 30 , 31 , 33 , 34 , 35 , 36 , 37 ], although HPA is the source of nonlinear distortion.…”

Section: Introductionmentioning

confidence: 99%

“… Many precoding-companding techniques [ 26 , 29 , 31 , 36 , 37 ], are not compared with any previous works. HPA was neglected in the models [ 22 , 26 , 27 , 28 , 30 , 31 , 33 , 34 , 35 , 36 , 37 ], although HPA is the source of nonlinear distortion. The authors in [ 22 , 26 , 28 , 30 , 31 , 34 , 36 , 37 ] have not considered Rayleigh channel.…”

Section: Introductionmentioning

confidence: 99%

“…Many precoding-companding techniques [ 26 , 29 , 31 , 36 , 37 ], are not compared with any previous works.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

A Novel Hybrid Precoding-Companding Technique for Peak-to-Average Power Ratio Reduction in 5G and beyond

Mounir

Mashade

Berra

et al. 2021

Sensors

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Several high-speed wireless systems use Orthogonal Frequency Division Multiplexing (OFDM) due to its advantages. 5G has adopted OFDM and is expected to be considered beyond 5G (B5G). Meanwhile, OFDM has a high Peak-to-Average Power Ratio (PAPR) problem. Hybridization between two PAPR reduction techniques gains the two techniques’ advantages. Hybrid precoding-companding techniques are attractive as they require small computational complexity to achieve high PAPR reduction gain. Many precoding-companding techniques were introduced to increasing the PAPR reduction gain. However, reducing Bit Error Rate (BER) and out-of-band (OOB) radiation are more significant than increasing PAPR reduction gain. This paper proposes a new precoding-companding technique to better reduce the BER and OOB radiation than previous precoding-companding techniques. Results showed that the proposed technique outperforms all previous precoding-companding techniques in BER enhancement and OOB radiation reduction. The proposed technique reduces the Error Vector Magnitude (EVM) by 15 dB compared with 10 dB for the best previous technique. Additionally, the proposed technique increases high power amplifier efficiency (HPA) by 11.4%, while the best previous technique increased HPA efficiency by 9.8%. Moreover, our proposal achieves PAPR reduction gain better than the most known powerful PAPR reduction technique with a 99% reduction in required computational complexity.

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“…However, the solution is impractical because it uses inflection point and side information data as PLC. Finally, Square root Raised Cosine-based precoding was hybridized with

-law (SRC-

) in [ 36 , 37 ] without compared to the previous precoding-companding techniques.…”

Section: Introductionmentioning

confidence: 99%

“…The limitations of the discussed works are summarized as follows: The authors in [ 22 , 24 , 27 , 28 , 30 , 32 , 33 , 34 , 36 , 37 ] hybridized

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Many precoding-companding techniques [ 26 , 29 , 31 , 36 , 37 ], are not compared with any previous works.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A Novel Hybrid Precoding-Companding Technique for Peak-to-Average Power Ratio Reduction in 5G and beyond

Mounir

Mashade

Berra

et al. 2021

Sensors

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Hybrid scheme of precoder with μ‐law compander for PAPR reduction and nonlinearity improvement in ADO‐OFDM system

Sharan

Ghorai

2021

Int J Communication

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Summary The application of orthogonal frequency division multiplexing (OFDM) in a visible light communication (VLC) system increases the peak‐to‐average power ratio (PAPR) of the system. Owing to high PAPR, the intrinsic nonlinearity of LED is an important issue in an asymmetrically clipped DC‐biased optical OFDM (ADO‐OFDM) system. In this paper, a hybrid scheme is proposed to reduce the PAPR as well as to mitigate the nonlinearity in an ADO‐OFDM system. The proposed method is a combination of two ADO‐OFDM formats: precoded ADO‐OFDM and μ‐ADO‐OFDM. The preprocessing of the input using a predetermined matrix (PM) in the precoder relieves the need for a handshake at the receiver. The compression of the peak values and enhancement of low amplitudes of the precoded signal in the time domain yield a low PAPR of 2.4 dB only. Besides PAPR reduction, the union of precoder and compander boosts the bit error rate (BER) performance of the traditional ADO‐OFDM system for μ≤128. The combination of precoder with compander decreases the power requirements for high bit rate transmission for a reference BER of 10−3. In this work, nonlinearity is quantified in terms of error vector magnitude (EVM) in percent. The hybrid scheme shows an EVM of 17.23% for 0 dB input backoff power (IBO) much less than 66.4% EVM for a simple ADO‐OFDM system. In addition to low PAPR and mitigation of nonlinearity, the proposed method shows the improvement in power spectral density (PSD) of the system.

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An ADO‐OFDM with integrated precoding, companding and optimized power allocation methods for high‐speed data transmission in visible light communication

S.,

N. R.

2024

Trans Emerging Tel Tech

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Visible light communications (VLC) has received a lot of attention in recent studies because of its benefits over radio‐frequency (RF) communications. It is a short‐range optical wireless communication system that uses light‐emitting diodes (LEDs) as transmitters. Optical orthogonal frequency division multiplexing (OFDM) is an auspicious technology for VLC high‐speed data transfer. The use of OFDM in a VLC system raises the system's peak‐to‐average power ratio (PAPR). The intrinsic non‐linearity of LED is a key concern in an asymmetrically clipped DC‐biased optical OFDM (ADO‐OFDM) system due to its high PAPR. Also, conventional ADO‐OFDM modulation scheme cannot be used for accommodating different demands of services in downlink multiple access due to the restriction of direct current biased optical OFDM (DCO‐OFDM) and asymmetrically clipped optical (ACO‐OFDM) transmission on odd and even subcarriers. To tackle this issue, a modified ADO‐OFDM (MADO‐OFDM) is proposed that adjusts the numbers of subcarriers required for the transmission of ACO‐OFDM and DCO‐OFDM adaptively based on the requests of services in downlink multiple access. Also, the proposed MADO‐OFDM is integrated with a discrete Hartley Matrix transform (DisHMT) precoder and Generalized Piecewise Linear Compander (GPLD) to provide high‐speed data transmission with less PAPR. In addition, the power is allocated to the proposed MADO‐OFDM system optimally by maximizing the channel capacity based on the Aquila optimizer algorithm. The simulation results reveal that the suggested system's PAPR is reduced by 2.4 dB and 0.8 dB, respectively, compared to conventional ADO and hybrid ADO‐OFDM. It also confirms that the suggested generalized PLC can greatly increase BER without affecting the PAPR performance.

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PAPR reduction and non-linearity alleviation using hybrid of precoding and companding in a visible light communication (VLC) system

Cited by 19 publications

References 17 publications

A Novel Hybrid Precoding-Companding Technique for Peak-to-Average Power Ratio Reduction in 5G and beyond

A Novel Hybrid Precoding-Companding Technique for Peak-to-Average Power Ratio Reduction in 5G and beyond

Hybrid scheme of precoder with μ‐law compander for PAPR reduction and nonlinearity improvement in ADO‐OFDM system

An ADO‐OFDM with integrated precoding, companding and optimized power allocation methods for high‐speed data transmission in visible light communication

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