A Novel Clipping-Based Method to Reduce Peak-To-Average Power Ratio of OFDM Signals

Tang, Bo; Qin, Kaiyu; Chen, Changwei; Cao, Yong

doi:10.3390/info11020113

Cited by 9 publications

(7 citation statements)

References 25 publications

(43 reference statements)

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“…Nowadays, many researchers have proposed various well-known technologies to reduce PAPR in OFDM systems [ 11 , 12 , 13 ], such as clipping, SLM, PTS, TI, TR, etc. Among them, the clipping technique [ 14 , 15 ] is the easiest to implement, because only the input signal needs to be limited, but the clipped signal is prone to nonlinear distortion, and the location and size of the clipping are difficult to decide and store, which results in BER performance degradation [ 16 ] and spectral efficiency decline. In the SLM scheme [ 17 , 18 , 19 ], the frequency domain signals are multiplied by the rotation factor vector and generate several candidate signals, and the one with the minimum PAPR is selected for transmission.…”

Section: Introductionmentioning

confidence: 99%

A Novel Low Complexity Two-Stage Tone Reservation Scheme for PAPR Reduction in OFDM Systems

Chang²

2023

Sensors

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Orthogonal frequency division multiplexing (OFDM) has the characteristics of high spectrum efficiency and excellent anti-multipath interference ability. It is the most popular and mature technology currently in wireless communication. However, OFDM is a multi-carrier system, which inevitably has the problem of a high peak-to-average power ratio (PAPR), and s signal with too high PAPR is prone to distortion when passing through an amplifier due to nonlinearity. To address the troubles caused by high PAPR, we proposed an improved tone reservation (I-TR) algorithm to alleviate the above native phenomenon, which will pay some modest pre-calculations to estimate the rough proportion of peak reduction tone (PRT) to determine the appropriate output power allocation threshold then utilize a few iterations to converge to the near-optimal PAPR. Furthermore, our proposed scheme significantly outperforms previous works in terms of PAPR performance and computational complexity, such as selective mapping (SLM), partial transmission sequence (PTS), TR, tone injection (TI), etc. The simulation results show that in our proposed scheme, the PAPR is appreciably reduced by about 6.44dB compared with the original OFDM technique at complementary cumulative distribution function (CCDF) equal to 10−3, and the complexity of I-TR has reduced by approximately 96% compared to TR. Besides, as for bit error rate (BER), our proposed method always outperforms the original OFDM without any sacrifice.

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Section: Introductionmentioning

confidence: 99%

A Novel Low Complexity Two-Stage Tone Reservation Scheme for PAPR Reduction in OFDM Systems

Chang²

2023

Sensors

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“…Compressor/Expander is a good technique that is used to compress the OFDM signal at the transmitter end and expand it at the receiver which is called the companding technique. Lately, new techniques are proposed that are called Hybrid techniques, the basic idea is combining two or three techniques that give good results in terms of PAPR and Bit Error Rate (BER) [19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Palm Clipping and Nonlinear Companding Techniques Based Papr Reduction in Ofdm-DCSK System

Abdulridha

Hasan

2022

jeasd

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The main drawback of the Orthogonal Frequency Division Multiplexing (OFDM) with Differential Chaos Shift Keying (DCSK) that is named (OFDM-DCSK) is the high Peak to Average Power Ratio (PAPR). In this paper, clipping and companding techniques are suggested to overcome the PAPR problem in the OFDM-DCSK system. For the clipping technique, the clipping function is applied before transmitting the signal without the need for an inverse function at the receiver side. While for companding techniques, the commanding function is applied at the end of the transmitter side and the corresponding decompanding function is applied at the receiver to recover the original signal. Different companding techniques are investigated including Hyperbolic, A-Law, and Mu-Law companding function that are compared with the Palm clipping technique. The MATLAB simulation result shows that the Mu-Law technique has the best PAPR reduction (7.22 dB) with a good bit error rate (BER) performance when the number of subcarriers is equal to 512.

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“…When the linear dynamic range of the high power amplifier (HPA) is insufficient, a large PAPR will cause severe distortion of the transmission signal [ 15 ]. Currently, various techniques have been proposed to reduce the PAPR, including clipping and filtering (CF) [ 16 , 17 , 18 ], compression-expansion transformation [ 19 , 20 ], and selective mapping (SLM) [ 21 , 22 ]. It is worth noting that for PAPR reduction in multi-carrier systems using message-passing (MP) decoding, the sparsity of the ECM must be maintained [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

A Message Passing-Assisted Iterative Noise Cancellation Method for Clipped OTFS-BFDM Systems

Bie

Wen

2022

Sensors

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Compared with orthogonal frequency division multiplexing (OFDM) systems, orthogonal time frequency space systems based on bi-orthogonal frequency division multiplexing (OTFS-BFDM) have lower out-of-band emission (OOBE) and better robustness to high-mobility scenarios, but suffer from a higher peak-to-average ratio (PAPR) in large data packets. In this paper, one-iteration clipping and filtering (OCF) is adopted to reduce the PAPR of OTFS-BFDM signals. However, the extra noise introduced by the clipping process, i.e., clipping noise, will distort the desired signal and increase the bit error rate (BER). We propose a message passing (MP)-assisted iterative cancellation (MP-AIC) method to cancel the clipping noise based on the traditional MP decoding at the receiver, which incorporates with the (OCF) at the transmitter to keep the sparsity of the effective channel matrix. The main idea of MP-AIC is to extract the residual signal fed to the MP detector by iteratively constructing reference clipping noise at the receiver. During each iteration, the variance of residual signal and channel noise are taken as input parameters of MP decoding to improve the BER. Moreover, the convergence probability of the modulation alphabet after MP decoding in the current iteration is used as the initial probability of MP decoding in the next iteration to accelerate the convergence rate of MP decoding. Simulation results show that the proposed MP-AIC method significantly improves MP-decoding accuracy while accelerating the BER convergence in the clipped OTFS-BFDM system. In the clipped OTFS-BFDM system with rectangular pulse shaping, the BER of MP-AIC with two iterations can be reduced by 72% more than that without clipping noise cancellation.

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A Novel Clipping-Based Method to Reduce Peak-To-Average Power Ratio of OFDM Signals

Cited by 9 publications

References 25 publications

A Novel Low Complexity Two-Stage Tone Reservation Scheme for PAPR Reduction in OFDM Systems

A Novel Low Complexity Two-Stage Tone Reservation Scheme for PAPR Reduction in OFDM Systems

Palm Clipping and Nonlinear Companding Techniques Based Papr Reduction in Ofdm-DCSK System

A Message Passing-Assisted Iterative Noise Cancellation Method for Clipped OTFS-BFDM Systems

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