A Novel Low Computational Complexity Multiple Signal Representation Technique for PAPR Reduction in OFDM Systems

Average Power ◽

Papr Reduction ◽

Ofdm Systems ◽

Signal Representation ◽

Phase Selection ◽

High Data ◽

Multiple Signal ◽

Representation Technique

Orthogonal Frequency Division Multiplexing (OFDM) while being an efficient scheme for high data rate wireless communications has drawbacks such as higher Peak-to-Average Power Ratio (PAPR). To reduce PAPR, use of multiple signal representation technique such as Partial Transmit Sequence (PTS) is one of the favored techniques. However, the use of conventional PTS technique need excessive number of complex calculations in order to search for all permissible combinations of phase sequences causing steep increase in complexity in terms of complex computations. Paper aims to reduce the cumbersome process of phase selection by making use of the similarity of the phase vectors. The phase vectors are obtained sequentially and thus minimize the number of changes from one phase vector to another. Theoretical analysis shows that computational complexity is significantly reduced with the help of this proposed novel technique. We have also demonstrated that PAPR values are similar i.e. PAPR reduction capability remains similar but at reduced complexity.

Effect of Controlling Parameters of Tone Reservation Based on Null Subcarriers (TRNS) on the Performance of OFDM Systems

International Journal of Sociotechnology and Knowledge Development ◽

10.4018/ijskd.2020040103 ◽

2020 ◽

Vol 12 (2) ◽

pp. 45-62

Author(s):

Mohamed Mounir ◽

Mohamed Bakry El Mashade

Keyword(s):

Communication Systems ◽

Average Power ◽

Threshold Value ◽

Papr Reduction ◽

Ofdm Systems ◽

Peak Reduction ◽

High Data ◽

Tone Reservation ◽

Number Of Iterations

High data rate communication systems usually implement Orthogonal Frequency Division Multiplexing (OFDM) to face frequency selectivity. High Peak to Average Power Ratio (PAPR) is an OFDM disadvantage that causes Bit Error Rate (BER) degradation and out-of-band (OOB) radiation when OFDM signal pass through nonlinear Power Amplifier (PA). In order to overcome this problem larger Input Back-Off (IBO) is required. However, large IBO decreases the PA efficiency. PAPR reduction techniques are used to reduce the required IBO, so that PA efficiency is saved. Several PAPR reduction methods are introduced in literature, among them Tone Reservation based on Null Subcarriers (TRNS) is downward compatible version of Tone Reservation (TR) with small excess in the average power and low computational complexity compared to others. As will be shown, TRNS is the best practical one of the four downward compatible techniques. Performance of TRNS is controlled by three parameters; number of peak reduction tones (PRTs), predefined threshold (Amax), and number of iterations (Itr). In order to increase PAPR reduction gain, enhance BER performance, and reduce the required IBO to follow the given power spectral density (PSD), we have to choose the values of these parameters adequately. Results showed that, we have to reduce the threshold value to the average (i.e. Amax =0 dB). Also, we have to increase number of PRTs. However, we have to maintain the spectrum shape. Finally, we have to choose moderate number of iterations (e.g. Itr ≈50), as excessive increase in number of iterations is not useful, especially at high PAPR values.

Techniques for PAPR Reduction in OFDM Systems

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.443-444.340 ◽

2012 ◽

Vol 443-444 ◽

pp. 340-346

Author(s):

Lin Chen ◽

Xue Long Hu

Keyword(s):

Average Power ◽

Papr Reduction ◽

Signal Distortion ◽

Frequency Division ◽

Communication Research ◽

Ofdm Systems ◽

High Data ◽

Advantages And Disadvantages ◽

Definition Of

Orthogonal Frequency Division Multiplexing (OFDM) has been focused on in high-data-rate wireless communication research. But the high Peak-to-Average Power Ratio (PAPR) is one of the main obstacles to limit wide applications of OFDM. In this paper, based on the definition of the PAPR in OFDM systems, these techniques on PAPR reduction are presented, including signal distortion, signal scrambling, and block coding. The advantages and disadvantages of these techniques are discussed in detail and some performances are achieved by Monte Carlo simulations.

PAPR Reduction Using Fireworks Search Optimization Algorithm in MIMO-OFDM Systems

Journal of Electrical and Computer Engineering ◽

10.1155/2018/3075890 ◽

2018 ◽

Vol 2018 ◽

pp. 1-11 ◽

Cited By ~ 4

Author(s):

Lahcen Amhaimar ◽

Saida Ahyoud ◽

Ali Elyaakoubi ◽

Abdelmoumen Kaabal ◽

Kamal Attari ◽

...

Keyword(s):

Communication Systems ◽

Multiple Input Multiple Output ◽

Average Power ◽

Papr Reduction ◽

Main Concern ◽

Ofdm Systems ◽

Fireworks Algorithm ◽

Mimo Ofdm

The transceiver combination technology, of orthogonal frequency division multiplexing (OFDM) with multiple-input multiple-output (MIMO), provides a viable alternative to enhance the quality of service and simultaneously to achieve high spectral efficiency and data rate for wireless mobile communication systems. However, the high peak-to-average power ratio (PAPR) is the main concern that should be taken into consideration in the MIMO-OFDM system. Partial transmit sequences (PTSs) is a promising scheme and straightforward method, able to achieve an effective PAPR reduction performance, but it requires an exhaustive search to find the optimum phase factors, which causes high computational complexity increased with the number of subblocks. In this paper, a reduced computational complexity PTS scheme is proposed, based on a novel swarm intelligence algorithm, called fireworks algorithm (FWA). Simulation results confirmed the adequacy and the effectiveness of the proposed method which can effectively reduce the computation complexity while keeping good PAPR reduction. Moreover, it turns out from the results that the proposed PTS scheme-based FWA clearly outperforms the hottest and most important evolutionary algorithm in the literature like simulated annealing (SA), particle swarm optimization (PSO), and genetic algorithm (GA).

Boosted PTS Method with Mu-Law Companding Techniques for PAPR Reduction in OFDM Systems

10.21203/rs.3.rs-386678/v1 ◽

2021 ◽

Author(s):

Zeyid Ibraheem ◽

Kawakib k ◽

Yousef Fazea ◽

Mohammed Madi ◽

Fathey Mohammed ◽

...

Keyword(s):

Communication System ◽

Communication Systems ◽

Average Power ◽

Diffusion Method ◽

Papr Reduction ◽

Ofdm Systems ◽

Low Computational Complexity ◽

Block Partition

Abstract Perpendicular rate of recurrence splitting up a group of numeral television or radio channels that are mixed together for broadcast Orthogonal Frequency Division Multiplexing which can be a potential diffusion method for elevating the transmission capacity of the communication systems. In spite of the significance of OFDM, the primary issue of the peak-to-average power ratio (PAPR) which augments communication system complications, reduces the effectiveness of the communication system, resulting in low performance of bit-error-rate (BER), and making OFDM perceptive toward non-linear distortion within a broadcast. Various techniques were projected for treating PAPR issues, inclusive of partial transmit sequence (PTS) which captivated great interest. Thus, this paper proposed a hybrid method inclusive of a boosted PTS scheme with Mu-law compressing and expanding approach. The PTS approach was boosted through boosting its sub-block partitioning scheme, the place where the aggrandized partitioning scheme consolidated a conventional interleaved partitioning into an adjacent partitioning scheme. The present merger concerning Mu-Law characteristic in time domain for PAPR reduction in OFDM fundamentally boosts PAPR diminution performance. Accordingly, though the simulated pseudorandom sub-block partition method improved PAPR diminution supplementary further than other sub-block partition schemes appertaining to conventional PTS, while maintaining low computational complexity. The findings show that the boosted PTS scheme with Mu-law expanding approach, whilst upholding low computational complexity, achieves considerably superior to the pseudorandom partitioning PTS with regard to various type of modulation format and subcarriers.

Median codeword Shift (MCS) technique for PAPR reduction with low complexity in OFDM system

International Journal of Electrical and Computer Engineering (IJECE) ◽

10.11591/ijece.v9i6.pp4882-4888 ◽

2019 ◽

Vol 9 (6) ◽

pp. 4882

Author(s):

Mohd Danial Rozaini ◽

Azlina Idris ◽

Darmawaty Mohd Ali ◽

Ezmin Abdullah

Keyword(s):

Communication Technology ◽

Rapid Development ◽

Average Power ◽

Low Complexity ◽

Papr Reduction ◽

Frequency Division ◽

High Data ◽

Data Rates

With the rapid development of today’s communication technology, the need for a system capable to improve spectral efficiency, high data rates and at the same time can reduce inter-symbol interference (ISI) is necessary. Orthogonal Frequency Division Multiplexing (OFDM) meet all the requirements needed. However, the high peak to average power ratio (PAPR) has become its major obstacle. This paper is focusing on the development of Median Codeword Shift (MCS), which a new PAPR reduction technique with the capability to reduce the computational complexity of the system. This can be achieved through codeword structure alterization and bit position manipulation by utilizing the circulant shift process. The simulation results revealed that the proposed technique overwhelm conventional OFDM and SCS with 24% improvement and 0.5 dB gap from SCS. In fact, the proposed technique possess a lower computational complexity by reducing 16.67% of the use of IFFT block in the system in contrast with SCS technique.

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

Sensors ◽

10.3390/s21041410 ◽

2021 ◽

Vol 21 (4) ◽

pp. 1410

Author(s):

Mohamed Mounir ◽

Mohamed B. El_Mashade ◽

Salah Berra ◽

Gurjot Singh Gaba ◽

Mehedi Masud

Keyword(s):

High Speed ◽

Average Power ◽

Papr Reduction ◽

Power Ratio ◽

Error Vector Magnitude ◽

Hybrid Precoding ◽

High Power Amplifier ◽

Reduction Techniques

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.

AN EFFICIENT METHOD FOR PAPR REDUCTION IN OFDM SYSTEMS WITH REDUCED COMPLEXITY

International Journal of Electronics and Electical Engineering ◽

10.47893/ijeee.2013.1076 ◽

2013 ◽

pp. 96-100

Author(s):

PRITANJALI KUMARI ◽

US TRIAR

Keyword(s):

Average Power ◽

High Peak ◽

Papr Reduction ◽

Power Calculation ◽

Frequency Division Multiplexing ◽

Power Ratio ◽

Frequency Division ◽

Ofdm Systems ◽

Reduced Complexity

Orthogonal Frequency Division Multiplexing (OFDM), widely used in digital wireless communication, has a major drawback of high Peak to Average Power Ratio (PAPR). A reduced complexity partial transmit sequence (PTS) scheme has been proposed to solve high peak to average power ratio (PAPR) of orthogonal frequency division multiplexing (OFDM) system. In the proposed PTS scheme, a function is generated by summing the power of time domain samples at time ‘n’ in each sub blocks, known as “Hn”.Only those samples, having Hn greater than or equal to a preset threshold value (αT) are used for peak power calculation during the process of selecting a candidate signal with the lowest PAPR for transmission. As compared to conventional PTS scheme, the proposed scheme achieves almost the same PAPR reduction performance with much lower computational complexity.

On the Comparative Performance Analysis of PAPR Reduction Techniques in OFDM System

Rajshahi University Journal of Science and Engineering ◽

10.3329/rujse.v43i0.26179 ◽

2015 ◽

Vol 43 ◽

pp. 39-49

Author(s):

Md. Ibrahim Khalil ◽

Sabbir Ahmed

Keyword(s):

Performance Analysis ◽

Average Power ◽

Papr Reduction ◽

Hadamard Transform ◽

Ofdm Systems ◽

Comparative Performance ◽

Computational Overhead ◽

Reduction Techniques ◽

Overall Performance

Selected Mapping (SLM) and Partial Transmit Sequence (PTS) are two very well-known Peak-to-average Power Ratio (PAPR) reduction techniques for Orthogonal Frequency Division Multiplexing (OFDM) systems. Both these schemes show good PAPR reduction capabilities. However, for any PAPR reduction technique, the nature of spectral occupancy and the associated computational complexity also need to be taken into account when the overall performance is considered. In this paper, our goal is to perform a comparative performance analysis of SLM and PTS techniques by considering these three parameters, i.e. PAPR reduction, computational overhead and spectral compactness. For this, we at first look for the optimum values in terms of number of sequences in SLM and no. of sub-blocks in PTS. And then based on this finding, we perform performance analysis. Our finding shows that, PTS outperforms SLM when compared on the parameters mentioned above. Finally, to explore the feasibility of further improvement, we apply Walsh-Hadamard Transform to PTS scheme and show that it further reduces PAPR and improves spectral compactness.

Palm Date Leaf Clipping: A New Method to Reduce PAPR in OFDM Systems

Information ◽

10.3390/info11040190 ◽

2020 ◽

Vol 11 (4) ◽

pp. 190 ◽

Cited By ~ 1

Author(s):

Brahim Bakkas ◽

Reda Benkhouya ◽

Idriss Chana ◽

Hussain Ben-Azza

Keyword(s):

Communication Systems ◽

High Speed ◽

Average Power ◽

Papr Reduction ◽

Frequency Division ◽

Ofdm Systems ◽

Leaf Clipping ◽

Hyperbolic Cosine ◽

Transmitted Signal

Orthogonal frequency division multiplexing (OFDM) is the key technology used in high-speed communication systems. One of the major drawbacks of OFDM systems is the high peak-to-average power ratio (PAPR) of the transmitted signal. The transmitted signal with a high PAPR requires a very large linear range of the Power Amplifier (PA) on the transmitter side. In this paper, we propose and study a new clipping method named Palm Clipping (Palm date leaf) based on hyperbolic cosine. To evaluate and analyze its performance in terms of the PAPR and Bit Error Rate (BER), we performed some computer simulations by varying the Clipping Ratio (CR) and modulation schemes. The obtained results show that it is possible to achieve a gain of between 7 and 9 dB in terms of PAPR reduction depending on the type of modulation. In addition, comparison with several techniques in terms of PAPR and BER shows that our method is a strong alternative that can be adopted as a PAPR reduction technique for OFDM-based communication systems.

A novel generalized oppositional biogeography-based optimization algorithm: application to peak to average power ratio reduction in OFDM systems

Open Mathematics ◽

10.1515/math-2016-0066 ◽

2016 ◽

Vol 14 (1) ◽

pp. 705-722 ◽

Cited By ~ 4

Author(s):

Sotirios K. Goudos

Keyword(s):

Average Power ◽

Papr Reduction ◽

Power Ratio ◽

Ofdm Systems ◽

Major Drawback ◽

A New Technique ◽

Power Ratio Reduction ◽

Ofdm Signals ◽

Ratio Reduction

AbstractA major drawback of orthogonal frequency division multiplexing (OFDM) signals is the high value of peak to average power ratio (PAPR). Partial transmit sequences (PTS) is a popular PAPR reduction method with good PAPR reduction performance, but its search complexity is high. In this paper, in order to reduce PTS search complexity we propose a new technique based on biogeography-based optimization (BBO). More specifically, we present a new Generalized Oppositional Biogeography Based Optimization (GOBBO) algorithm which is enhanced with Oppositional Based Learning (OBL) techniques. We apply both the original BBO and the new Generalized Oppositional BBO (GOBBO) to the PTS problem. The GOBBO-PTS method is compared with other PTS schemes for PAPR reduction found in the literature. The simulation results show that GOBBO and BBO are in general highly efficient in producing significant PAPR reduction and reducing the PTS search complexity.