PAPR Reduction Of OFDM Signals Research Articles

PRNet with Convolution Layer for PAPR Reduction of OFDM Signals

PRNet with Convolution Layer for PAPR Reduction of OFDM Signals

PAPR Reduction of OFDM Signals Using Clipping and Coding

The problem of the high peak to average ratio (PAPR) in OFDM signals is investigated with a brief presentation of the various methods used to reduce the PAPR with special attention to the clipping method. An alternative approach of clipping is presented, where the clipping is performed right after the IFFT stage unlike the conventional clipping that is performed in the power amplifier stage, which causes undesirable out of signal band spectral growth. In the proposed method, there is clipping of samples not clipping of wave, therefore, the spectral distortion is avoided. Coding is required to correct the errors introduced by the clipping and the overall system is tested for two types of modulations, the QPSK as a constant amplitude modulation and 16QAM as a varying amplitude modulation.

Active Constellation Modification Technique for PAPR Reduction of OFDM Signals

Active Constellation Modification Technique for PAPR Reduction of OFDM Signals

PAPR Reduction of OFDM Signals Using Null Space in MIMO Channel for MIMO Amplify-and-Forward Relay Transmission

PAPR Reduction of OFDM Signals Using Null Space in MIMO Channel for MIMO Amplify-and-Forward Relay Transmission

Asymmetric autoencoder for PAPR reduction of OFDM signals

Asymmetric autoencoder for PAPR reduction of OFDM signals

A novel ant colony optimization algorithm for PAPR reduction of OFDM signals

SummaryThe high peak‐to‐average power ratio (PAPR) is the main challenge of orthogonal frequency division multiplexing (OFDM) systems. Partial transmit sequence (PTS) is a useful approach to diminish the PAPR. Although the PTS approach significantly decreases the PAPR, it requires to explore all possible sequences of phase weighting factors. Hence, the computational cost exponentially increases with the number of divided subblocks. This paper proposes a novel PTS technique based on ant colony optimization (ACO) to diminish the high PAPR and computational cost of OFDM systems. By the new representation of phase factors as a graph, the improved ACO algorithm is combined with the PTS method to explore the optimal compound of the phase rotation factors. Simulation results represent that the proposed ACO‐based PTS approach significantly reduces the PAPR and improves the computational cost at the same time. A comparative analysis of the other meta‐heuristics shows that the ACO‐PTS approach outperforms the genetic algorithm, particle swarm optimization, and gray wolf optimization in terms of reducing PAPR.

An Adaptive Tone Reservation Scheme for PAPR Reduction of OFDM Signals

An Adaptive Tone Reservation Scheme for PAPR Reduction of OFDM Signals

Improved PTS Technique Based on Sub-Block Weighting Method of PAPR Reduction in OFDM Signals

Improved PTS Technique Based on Sub-Block Weighting Method of PAPR Reduction in OFDM Signals

New PTS Schemes for PAPR Reduction of OFDM Signals Without Side Information

In this paper, two partial transmit sequence (PTS) schemes without side information (SI) are proposed for reducing peak-to-average power ratio of orthogonal frequency division multiplexing signals. The proposed schemes do not transmit SI identifying a rotating vector because identifiable phase offset is applied to the elements of each rotating vector. To extract SI from the received signal and recover the data sequence, the maximum likelihood (ML) detector is used. This ML detector exploits the Euclidean distance between the given signal constellation and the signal constellation rotated by the phase offset. By doing pairwise error probability (PEP) analysis, it is investigated how to choose good phase offsets for embedding SI. Also, the performance degradation caused by SI detection failure is analyzed based on PEP. Finally, through numerical analysis, it is shown that the BER performance of the proposed PTS schemes is not degraded compared with the conventional PTS with perfect SI.

PAPR Reduction of OFDM Signal with SPS-SLM Technique and Analysis of BER Performance through AWGN Channel

PAPR Reduction of OFDM Signal with SPS-SLM Technique and Analysis of BER Performance through AWGN Channel

PTS using novel constellation extension scheme for PAPR reduction of OFDM signals without side information

PTS using novel constellation extension scheme for PAPR reduction of OFDM signals without side information

Partial scrambling selected mapping for PAPR reduction of OFDM signals

Partial scrambling selected mapping for PAPR reduction of OFDM signals

English

English

Partial approximate gradient constellation for PAPR reduction in OFDM signals

In this paper, a combinational approach for peak-to-average power ratio reduction in orthogonal frequency division multiplexing is proposed. The key idea of the proposed scheme is to apply partial transmit sequence and approximate gradient project schemes in parallel on two equal halves of subcarrier in an OFDM standard. On one half, partial transmit sequence minimises the PAPR of OFDM symbols through disjoint sub blocks and optimised phase factors, whereas for the other half, approximate gradient project extends the outer constellation points of OFDM symbols dynamically within margin-preserving constraints to reduce the peak magnitude of symbols. The simulation results show that proposed schemes reduces the PAPR as compared to other conventional schemes and maintains the bit error rate performance of the system especially at low signal to noise ratio. Moreover, the proposed method improves the data rate and also reduces the computational complexity when compared with partial transmit sequence scheme.

Invertible Subset QC-LDPC Codes for PAPR Reduction of OFDM Signals

A type of invertible subset low density parity-check (IS-LDPC) codes was proposed to reduce the peak-to-average power ratio for orthogonal frequency-division multiplexing systems with low complexity recently, where the key idea is that each invertible subset can be independently inverted to generate other valid codewords of the LDPC code. In this paper, we firstly extend the idea of invertible subsets to quasi-cyclic LDPC (QC-LDPC) codes, and this new family of QC-LDPC codes is called as invertible subset QC-LDPC (IS-QC-LDPC) codes. Moreover, we propose two types of subset partitioning and deeply discuss the properties of IS-QC-LDPC codes with different subset partitioning. After declaring that interleaved partitioning is more appropriate for IS-QC-LDPC codes than the block partitioning, we propose a novel progressive edge graph-like algorithm to construct good IS-QC-LDPC codes with interleaved partitioning. The simulation results show that the IS-QC-LDPC codes exhibit good error-correcting performance, which is very close to that of the corresponding QC-LDPC codes of the IEEE 802.16e, for a wide range of subset number.

Probabilistic Constellation Extension Scheme for PAPR Reduction in OFDM Signals

In this paper, a combinational method is proposed to mitigate the peak-to-average power ratio problem in orthogonal frequency division multiplexing signals. The proposed algorithm is an intelligent combination of the constellation extension and probabilistic techniques. It is shown that proposed technique achieves the significant reduction in peak-to-average power on maintaining sufficient bit error rate with a slight increase in computational complexity compared to conventional schemes.

On the combined response of clipper-amplifier cascade for PAPR reduction of OFDM signals

Orthogonal frequency division multiplexed OFDM signals have high peak-to-average power ratio PAPR which results in excessive nonlinear distortion when amplified by power amplifiers PA and hence, reduction in system signal-to-noise SNR and spectral efficiency. Clipping has been one of the most popular and low-cost technique for reducing the PAPR of OFDM signals. The overall spectral efficiency of an OFDM system that involves clipping depends on the combined response of the cascade of clipper-amplifier and not only on the response of the clipper. In this article, the performance of clipped and nonlinearly amplified OFDM signals is studied. The combined response of a clipper-amplifier cascade is obtained using an orthogonalized behavioral model which enables in-band and out-of-band nonlinear distortions to be accurately predicted without using the Gaussian assumption of signal statistics. Furthermore, different clipping characteristics are studied where it is shown that the overall nonlinear distortion, and hence the overall SNR, is highly dependent on the type of clipping characteristics and the clipping ratio. Simulation results are verified by Simulink measurement model which uses measured amplifier characteristics in a General Amplifier block. © 2014 Wiley Periodicals, Inc. Int J RF and Microwave CAE 24:656-664, 2014.

Modified PTS with Interleaving for PAPR Reduction of OFDM Signal with QPSK Subblocks

Modified PTS with Interleaving for PAPR Reduction of OFDM Signal with QPSK Subblocks

A comparative analysis of techniques for PAPR reduction of OFDM signals

A comparative analysis of techniques for PAPR reduction of OFDM signals

Analysis of PTS Scheme Used for PAPR Reduction of OFDM Signal

Analysis of PTS Scheme Used for PAPR Reduction of OFDM Signal