A combination of selected mapping and clipping to increase energy efficiency of OFDM systems

Lee, Byung Moo; Rim, You Seung; Noh, Wonjong

doi:10.1371/journal.pone.0185965

Cited by 11 publications

(7 citation statements)

References 32 publications

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“…Moreover, asymptotically at high IBO, for limited maximum amplitude r max , the HPA output is equal to its input, i.e. H HPA (r) = r. Hence, from the generic EVM expression of Lemma 1, by using (20) and (22), T 1 and P out can be expressed for high IBO as:…”

Section: B Evm Results Analysismentioning

confidence: 99%

“…This last result was also independently derived in [21]. Aiming at studying a combined scheme of clipping and SLM technique, the authors of [22] evaluated the simulated probability density function (PDF) of the time domain signal after applying clipping, SLM and the combined techniques respectively, in order to visualize the distortions caused by PAPR reduction methods. Also, they proposed an empirical model of the average distortion power expression due to clipping while using the combined techniques based on the distortion power calculated in [17].…”

Section: Introductionmentioning

confidence: 94%

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EVM Closed-Form Expression for OFDM Signals With Tone Reservation-Based PAPR Reduction

Hassan

Crussière

Hélard

et al. 2020

IEEE Trans. Wireless Commun.

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Peak to average power ratio (PAPR) reduction of OFDM signals has extensively been studied in the literature. Tone Reservation (TR) is one of the most famous algorithms and has already been included in some digital television standards such as DVB-T2 and ASTC3.0. However, the literature is still lacking theoretical analysis and performance bounds for the PAPR reduction of OFDM signals, especially using TR algorithms. For the first time, this paper provides fundamental results establishing the links between TR-PAPR reduction and the remaining signal distortions at the output of a non-linear high power amplifier (HPA) with and without memory effects. We first derive a generic EVM expression relying on the statistical characteristics of the samples composing the time domain signal and for any PAPR reduction technique. Computing these moments in the case of the quadratically constrained quadratic problem (QCQP) algorithm known as the optimal solution to the TR-PAPR reduction problem allows us to get the lower bound of the EVM of OFDM signals after TR-PAPR reduction and nonlinear HPA. As a reference, we also provide the EVM expression using a clipping-based PAPR reduction method. The obtained EVM expressions have direct practical meaning since they are in function of the input power back-off (IBO) applied to the signal before the HPA. They also consist in a general analytical framework for OFDM PAPR reduction since they can be further exploited to analyze the performance of sub-optimal TR-based PAPR reduction algorithms.

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Section: B Evm Results Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 94%

EVM Closed-Form Expression for OFDM Signals With Tone Reservation-Based PAPR Reduction

Hassan

Crussière

Hélard

et al. 2020

IEEE Trans. Wireless Commun.

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“…This high PAPR severely affect energy efficiency for batteries deployed transceivers in UWA communication. It has been noted in Reference 9, that the rising energy cost of network operations contributes to 50% of total operational expenditure. However, this energy cost can be reduced by improving the energy efficiency of HPA.…”

Section: Introductionmentioning

confidence: 99%

Peak to average power ratio alleviation by utilizing swarm intelligence along with machine learning for multiple input multiple output‐orthogonal frequency division multiplexing based underwater acoustic communication system

BanooriFarhad

ShiJinglun

ArshadJehangir

et al. 2021

Trans Emerging Tel Tech

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An underwater acoustic (UWA) network uses multiple input multiple output‐orthogonal frequency division multiplexing (MIMO‐OFDM) to achieve high data rate with high amplitude that results in terms of augmented peak to average power ratio (PAPR). This significant PAPR deemed as a stumbling block to degrade the performance of MIMO‐OFDM in UWA communication by causing nonlinear distortion within the high‐power amplifier (HPA). While PAPR mitigation techniques have been suggested for the single input single output UWA case, there has been limited research work on controlling the PAPR dilemma in the MIMO‐OFDM UWA case. To address this flaw, this article proposes a modified behavior of the artificial bee colony algorithm at the transmission end, which is further cross‐verified using machine learning techniques. The simulation results show that the proposed technique outperforms current state‐of‐the‐art PAPR diminishing methods, which is further enhanced in accordance with varying neuron counts and population size. Following that, we also analyzed and compared energy efficiency and performance gain of our proposed technique along with various advanced techniques. Furthermore, a desirable ratio between new and trained data was obtained to improve network efficiency by keeping PAPR values low.

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“…Many researchers introduced such techniques and classified PAPR into several classes. In terrestrial communication, clipping is the easiest way to mitigate PAPR [20][21][22][23]. Moreover, reconstruction of the lost clipped signal, iterative clipping, and filtering have been introduced [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Selective Mapping in Underwater Acoustic Orthogonal Frequency Division Multiplexing Communication System

Raza¹,

Ali

Raza

et al. 2021

Eng. Technol. Appl. Sci. Res.

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Under-Water Acoustic (UWA) communication networks are commonly formed by associating various independent UWA vehicles and transceivers connected to the bottom of the sea with battery-operated power modems. Orthogonal Frequency Division Multiplexing (OFDM) is one of the most vital innovations for UWA communications, having improved data rates and the ability to transform fading channels into flat fading. Moreover, OFDM is more robust on Inter-Symbol and Inter-Carrier Interferences (ISI and ICI respectively). However, OFDM technology suffers from a high Peak to Average Power Ratio (PAPR), resulting in nonlinear distortions and higher Bit Error Rates (BERs). Saving power of battery deployed modems is an important necessity for sustainable underwater communications. This paper studies PAPR in UWA OFDM communications, employing Selective Mapping (SLM) as a tool to mitigate PAPR. The proposed SLM with the oversampling factor method proves to be less complex and more efficient. Simulation results indicate that SLM is a promising PAPR reduction method for UWA OFDM communications reducing BER.

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A combination of selected mapping and clipping to increase energy efficiency of OFDM systems

Cited by 11 publications

References 32 publications

EVM Closed-Form Expression for OFDM Signals With Tone Reservation-Based PAPR Reduction

EVM Closed-Form Expression for OFDM Signals With Tone Reservation-Based PAPR Reduction

Peak to average power ratio alleviation by utilizing swarm intelligence along with machine learning for multiple input multiple output‐orthogonal frequency division multiplexing based underwater acoustic communication system

Performance Analysis of Selective Mapping in Underwater Acoustic Orthogonal Frequency Division Multiplexing Communication System

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