![OFDM transmitter [7].](https://www.researchgate.net/profile/Khaled-Elleithy/publication/257943775/figure/fig5/AS:668568240807939@1536410498257/OFDM-transmitter-7_Q320.jpg)
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![CCDFs of PAPR of two OFDM signals after being modified using SLM scheme [1].](https://www.researchgate.net/profile/Khaled-Elleithy/publication/257943775/figure/fig2/AS:297452155490309@1447929528710/CCDFs-of-PAPR-of-two-OFDM-signals-after-being-modified-using-SLM-scheme-1_Q320.jpg)
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A new proposed peak-to-average power reduction parameter to evaluate SLM and PTS as OFDM PAPR reduction schemes
Abstract and Figures
Two techniques of the most known ones for peak to average power ratio (PAPR) reduction of orthogonal frequency division multiplexing (OFDM) are selected mapping (SLM) and partial transmit sequence (PTS). Both schemes were proposed as distortion less PAPR reduction algorithms. However, it has been an argument to prove which scheme is the most efficient. In this paper, we propose a new PAPR reduction efficiency parameter which will be applied on the complementary cumulative distribution function (CCDF) of each technique to compare the results. We show as well how the performance of the system reacts when increasing the probability of getting high PAPR values. Using the proposed efficiency formula, we show that PTS system performance improves when increasing the probability, whereas the SLM system performance gets impaired when increasing the probability within the same range.
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In this letter, partial transmit sequences (PTS) based on parallel tabu search (Parallel TS-PTS) scheme is proposed to reduce the peak-to-average power ratio (PAPR) of orthogonal frequency division multiplexing (OFDM) signals. PTS is a distortionless PAPR reduction technique, but its high search complexity for finding optimal phase factors must be reduced for usable applications. Parallel TS-PTS is compared to different PTS schemes for PAPR reduction and search complexity performances. The simulation results show that the proposed parallel TS-PTS method provides good PAPR reduction and bit- error-rate (BER) performances. Index Terms—OFDM, PAPR, PTS, parallel tabu search, tabu search, high power amplifier (HPA).
In this paper, we discuss the effects of nonlinearity on the performance in transmission of OFDM signals. Furthermore, we study measures related to nonlinearities, such as PAPR (peak-to-average-power-ratio), with respect to their ability to correctly predict the effect of a nonlinearity in an OFDM system. We also propose new measures for signal distortion in nonlinear systems. The performance of the measures are studied using several examples.
Orthogonal Frequency Division Multiplexing (OFDM) has been currently under intense research for broadband wireless transmission due to its robustness against multi-path fading. However, OFDM signals are characterized by large peak-to-average power ratios (PAPR), which can reduce the system efficiency. To overcome this problem, in this paper, based on the definition of the PAPR in OFDM systems, we will mainly investigate the PAPR reduction performance with two different PAPR reduction methods: the selective mapping (SLM) and partial transmit sequence (PTS). A comprehensive analysis and comparison are conducted in terms of all possible influencing factors and PAPR reduction performance, respectively. Some research findings are obtained based on the simulation results. The results verify that PTS method provides a better PAPR reduction performance compared to SLM method and the probability of high PAPR with increasing the number of sub-blocks in PTS technique decreases obviously, compared to the original OFDM signal. In addition, SLM algorithm is more suitable if the system can tolerate more redundant information; otherwise, PTS algorithm is more acceptable when complexity becomes the first considering factor.
In this paper, we compare the performance of two peak-to-average power ratio (PAPR) reduction schemes. Specifically, selected mapping (SLM) and partial transmit sequence (PTS) schemes are investigated. The analysis was performed for an OFDM system aligned with the IEEE 802.16e standard with 256 and 1024 subcarriers. The results indicate that SLM has superior performance over PTS in reducing PAPR for the same number of subcarriers but at the expense of higher computational complexity. We have also investigated a modified selected mapping scheme with lower complexity.
Two powerful and distortionless peak power reduction schemes for
orthogonal frequency division multiplexing (OFDM) are compared. One
investigated technique is selected mapping (SLM) where the actual
transmit signal is selected from a set of signals and the second scheme
utilizes phase rotated partial transmit sequences (PTS) to construct the
transmit signal. Both approaches are very flexible as they do not impose
any restriction on the modulation applied in the subcarriers or on their
number. They both introduce some additional system complexity but nearly
vanishing redundancy to achieve markedly improved statistics of the
multicarrier transmit signal. The schemes are compared by simulation
results with respect to the required system complexity and transmit
signal redundancy
High peak-to-average power ratio of the transmit signal is a major drawback of multicarrier transmission such as OFDM or DMT. This article describes some of the important PAPR reduction techniques for multicarrier transmission including amplitude clipping and filtering, coding, partial transmit sequence, selected mapping, interleaving, tone reservation, tone injection, and active constellation extension. Also, we make some remarks on the criteria for PAPR reduction technique selection and briefly address the problem of PAPR reduction in OFDMA and MIMO-OFDM.
Selected mapping (SLM) peak-power reduction is distortionless as it selects the actual transmit signal from a set of alternative signals, which all represent the same information. The specific signal generation information needs to be transmitted and carefully protected against bit errors. Here, me propose an extension of SLM, which employs scrambling and refrains from the use of explicit side information in the receiver. Some additional complexity and nearly vanishing redundancy is introduced to achieve markedly improved transmit signal statistics. Even though SLM is applicable with any modulation, we concentrate on orthogonal frequency-division multiplexing (OFDM) in this letter.
The authors propose a very effective and flexible peak power reduction scheme for Orthogonal Frequency Division Multiplexing (OFDM) with almost vanishing redundancy. This new method works with arbitrary numbers of subcarriers and unconstrained signal sets. The core of the proposal is to combine partial transmit sequences (PTS) to minimize the peak--to-- average power ratio distortionless. 1 Introduction Besides intermodulation, out--of--band power [1] results from amplifying OFDM transmit signals with insufficient back--offs. Hence, the reliable reduction of peak power is of viable importance for the practical implementation of OFDM schemes. The small amount of redundancy required to reduce the peak amplitudes significantly [1] must be spread over all carriers. One effective method to achieve this spreading is given in [2] and this scheme will be referred to as selected mapping (SLM), as one desirable OFDM transmit signal is selected from a set of alternative signals. Similar approa...
The authors propose a method for the reduction of peak-to-average
transmit power ratio of multicarrier modulation systems, called selected
mapping, is presented, which is appropriate for a wide range of
applications. Significant gains can be achieved by selected mapping
whereas complexity remains quite moderate