PAPR Reduction In OFDM Systems Research Articles

Performance Analysis of Evolutionary Algorithm for PAPR Reduction in OFDM System

Performance Analysis of Evolutionary Algorithm for PAPR Reduction in OFDM System

Iterative clipping and filtering technique for papr reduction in ofdm system without encoding

Iterative clipping and filtering technique for papr reduction in ofdm system without encoding

PAPR Reduction in OFDM System Using PTS+DCT+SLM Technique

PAPR Reduction in OFDM System Using PTS+DCT+SLM Technique

Performance Evaluation of PAPR Reduction in OFDM System Using Non Linear Companding Transform

Orthogonal Frequency Division Multiplexing is considered as an advanced communication model which has wide range of applications such as 3G, 4G, and Wi-Fi etc. Though OFDM has lots of advantages over conventional communication models such as FDMA, CDMA still it has some disadvantages in that the major drawback is Peak to Average Power Ratio. In literature several theories are proposed to resolve this issue but none of the algorithm is designed to meet the practical approach. In our work a novel approach is present to resolve the Peak to Average Ratio by introducing the variable slopes parameters K1, K2 and inflexion points A (A>0) and CA (0<C<1) in the probability density function in the Non Linear Companding Transform Technique then based on the inflexion point and variables parameter analysis, The performances of two incompatible features PAPR and Bit Error rate can be achieved. Selection of Non Linear Companding transform parameters plays an essential role as overall performance, robustness depends on it. The proposed theoretical work results can be view through MATLAB simulation.

Analysis of PAPR Reduction in OFDM System by using both Signal Scrambling and Distortion Techniques

Analysis of PAPR Reduction in OFDM System by using both Signal Scrambling and Distortion Techniques

A Low-Complexity PTS Scheme with the Hybrid Subblock Partition Method for PAPR Reduction in OFDM Systems

A Low-Complexity PTS Scheme with the Hybrid Subblock Partition Method for PAPR Reduction in OFDM Systems

PTS Method with Combined Partitioning Schemes for Improved PAPR Reduction in OFDM System

PTS Method with Combined Partitioning Schemes for Improved PAPR Reduction in OFDM System

PAPR Reduction in OFDM System using Wavelet SLM and PTS Technique

Recently researchers have developed many techniques to solve high PAPR problem. These techniques have some merits and demerits. The concentration of this research work is especially upon the Selected Mapping (SLM) and Partial Transmit Sequence (PTS) techniques using Wavelet transforms (IDWT and DWT) instead of conventional Fast Fourier Transforms. The Fourier transform is a powerful tool to analyze the components of stationary signals for example this transform is used to process the signals containing the combination of sine and cosine signals. But the Fourier transform is less useful to analyze the components of non stationary signals. In non stationary signals there is a change in the properties of the signal and these signals are analyzes in real time. The wavelet transform is used to analyze the components of non stationary signals. Using wavelets the filters for stationary and non stationary signals can also be constructed. The mathematics of wavelets is much large in comparison to Fourier transform and this can be said that mathematics of wavelets encompasses the Fourier transform. The size of wavelet theory is matched to the application area. The main difference between these two transforms is the wavelet transform can be localized in both frequency and time domain whereas the Fourier transform can only be localized in frequency [11].

PAPR Reduction in OFDM Systems using Non-Linear Companding Transform

In this paper a non-linear companding transform is proposed which can effectively reduce the PAPR value in OFDM systems. High value of PAPR has undesirable effects on the performance of wireless communication systems. Various companding schemes are used to reduce the problem of PAPR in orthogonal frequency division multiplexing schemes. High PAPR drives the power amplifiers used at the transmitter’s side into non-linear region and leads to high power dissipation in hand held devices. The proposed NCT has the capability to transform power and amplitude of the original OFDM signal into a uniform distribution which leads to the reduction of PAPR.

PAPR Reduction in OFDM systems using Quasi Cyclic LDPC Codes

PAPR Reduction in OFDM systems using Quasi Cyclic LDPC Codes

An improved artificial bee colony-partial transmit sequence algorithm for PAPR reduction in OFDM systems

Orthogonal frequency division multiplexing OFDM is one of the most popular multi-carrier modulation techniques used in wireless communications and other applications. One of the major problems encountered in OFDM systems is the high peak to average power ratio PAPR of the transmitted signal, which will introduce nonlinear signal distortion and lead to high adjacent channel interference and make system performance worse. In this paper, a modified ABC-PTS artificial bee colony-partial transmit sequence PAPR reduction approach is proposed. Inspired by the idea of particle swarm optimisation algorithm, global best solution is introduced into the original ABC algorithm, and the updating equation is modified with the introduction of learning factor to consider the balance between the ability of exploration and exploitation of the algorithm. Simulation results have showed that the proposed approach has more reduction than the traditional ABC-PTS algorithm with the same time consuming while having lower bit error rate.

Joint ICI Cancellation and PAPR Reduction in OFDM Systems Without Side Information

Intercarrier interference (ICI) self-cancellation, new ICI self-cancellation and conjugate cancellation schemes have been proposed in the literature to mitigate the effect of ICI. In this paper we have performed the mathematical analysis of PAPR performances for ICI self-cancellation, new ICI self-cancellation and ICI conjugate cancellation schemes and it is found that PAPR performance of these schemes are either very close to or poorer than the standard OFDM signal, which necessitates the requirement of PAPR reduction. After realizing the need of PAPR reduction in ICI cancellation schemes, we have proposed a joint scheme to reduce ICI and PAPR simultaneously. In this paper, we have proposed a multipoint partial transmit sequence (PTS) scheme, to improve the PAPR performance of ICI cancellation schemes. The proposed multipoint PTS based PAPR reduction scheme is coupled with ICI cancellation schemes in such a way that CIR performance of these schemes after coupling remains unchanged and no SI is required at the receiver to recover the original data signal. A comparison of CIR and PAPR performances for ICI cancellation schemes with and without PAPR reduction is also presented in this paper. The analytical results of CIR and PAPR performances for conventional ICI cancellation and joint ICI cancellation and PAPR reduction confirm the outperformance of the proposed scheme. We have also evaluated the SER performance of the joint schemes over additive white Gaussian noise and fading channels and presented a comparison with other existing schemes.

Proposed Combined PTS with Clipping and Filtering Technique for PAPR Reduction in OFDM System

Proposed Combined PTS with Clipping and Filtering Technique for PAPR Reduction in OFDM System

Comparative Performance of Clipping Noise Guided and Complex Base- Band Active-Set methods Based on Tone Reservation for PAPR Reduction in OFDM Systems

Comparative Performance of Clipping Noise Guided and Complex Base- Band Active-Set methods Based on Tone Reservation for PAPR Reduction in OFDM Systems

A Low Complexity PTS Technique using Threshold for PAPR Reduction in OFDM Systems

Traffic classification seeks to assign packet flows to an appropriate quality of service (QoS) class based on flow statistics without the need to examine packet payloads. Classification proceeds in two steps. Classification rules are first built by analyzing traffic traces, and then the classification rules are evaluated using test data. In this paper, we use self-organizing map and K-means clustering as unsupervised machine learning methods to identify the inherent classes in traffic traces. Three clusters were discovered, corresponding to transactional, bulk data transfer, and interactive applications. The K-nearest neighbor classifier was found to be highly accurate for the traffic data and significantly better compared to a minimum mean distance classifier.

Performance of Using RLE for PAPR Reduction in OFDM System

Performance of Using RLE for PAPR Reduction in OFDM System

An Improved Method for PAPR Reduction in OFDM Systems Based on the PTS

该文在研究部分传输序列(PTS)技术降低OFDM系统峰均功率比(PAPR)的基础上，提出了多级寻优的改进PTS方法。该方法通过增加寻优的级数，而减少每级优化所预设的相位集合中的元素个数来寻找最优相位旋转因子，从而改变传统PTS技术中的计算量随分割子序列数和待选相位集合元素的个数的增加而呈指数增长的趋势，并使该方法与次优搜索方法相结合。通过计算复杂度的分析和仿真结果表明，同传统的方法相比，该方法不仅能较大地降低计算复杂度，且能改善降低峰均功率比的性能。

Performance Analysis of Clipping Noise Guided and Complex Base-Band Active-Set Methods Based on Tone Reservation for PAPR Reduction in OFDM Systems

Performance Analysis of Clipping Noise Guided and Complex Base-Band Active-Set Methods Based on Tone Reservation for PAPR Reduction in OFDM Systems

Companding schemes based on transforming signal statistics into trigonal distributions for PAPR reduction in OFDM systems

AbstractThis paper proposes four companding transforms to reduce the peak‐to‐average power ratio in orthogonal frequency division multiplexing systems. The four companding transforms are obtained by transforming signal statistics into four trigonal distributions. Computer simulations show that the proposed schemes can effectively improve the PAPR performance and bit error rate performance of OFDM systems. Copyright © 2010 John Wiley &amp; Sons, Ltd.

Erratum: Novel SLM Scheme with Low-Complexity for PAPR Reduction in OFDM System [IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E91.A (2008) , No. 7 pp.1689-1696

Erratum: Novel SLM Scheme with Low-Complexity for PAPR Reduction in OFDM System [IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E91.A (2008) , No. 7 pp.1689-1696