Effect of PAPR Reduction on Spectrum and Energy Efficiencies in OFDM Systems With Class-A HPA Over AWGN Channel

Jiang, Tao; Cai, Li; Ni, Chunxing

doi:10.1109/tbc.2013.2253814

Cited by 62 publications

(28 citation statements)

References 22 publications

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“…For example, in the case of class B PA, the η is defined as [30]: where p is the square-root of input back-off (IBO), . IBO is the ratio of the maximum allowable input power or satuartion input power of PA, P max and the average power of input signal P ave [10, 30]: Increasing IBO reduces distortion, but also reduces power efficiency.…”

Section: System Descriptionmentioning

confidence: 99%

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

2017

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We propose an energy efficient combination design for OFDM systems based on selected mapping (SLM) and clipping peak-to-average power ratio (PAPR) reduction techniques, and show the related energy efficiency (EE) performance analysis. The combination of two different PAPR reduction techniques can provide a significant benefit in increasing EE, because it can take advantages of both techniques. For the combination, we choose the clipping and SLM techniques, since the former technique is quite simple and effective, and the latter technique does not cause any signal distortion. We provide the structure and the systematic operating method, and show the various analyzes to derive the EE gain based on the combined technique. Our analysis show that the combined technique increases the EE by 69% compared to no PAPR reduction, and by 19.34% compared to only using SLM technique.

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Section: System Descriptionmentioning

confidence: 99%

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

2017

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“…Overlap frequency domain equalization does not require CP insertion, which increases the spectral efficiency. It was observed that because of the absence of CP, circular convolution is not possible, which results in ISI; however, application of FDE removes the ISI that is concentrated only at the center of the block instead of the whole signal . This observation is exploited in OFDE implementation.…”

Section: Wavelet Ofdm With Overlap Fdementioning

confidence: 99%

Linear precoded wavelet OFDM‐based PLC system with overlap FDE for impulse noise mitigation

Khan

Shin

2017

Int J Communication

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Summary In recent years, power lines have gained significant interest for their use in high‐speed communications because of the already deployed power distribution infrastructure. However, to achieve high data rates with reliability in power line communication (PLC), robust signal processing techniques are required to mitigate channel distortion and noise. Orthogonal frequency division multiplexing (OFDM) as a multicarrier modulation technique has been standardized for PLC; however, to further enhance the quality of communication, wavelet OFDM (WOFDM) has been proposed as a suitable choice. In this article, OFDM‐based and WOFDM‐based PLC systems are studied, and overlap frequency domain equalization (OFDE) as a robust and efficient equalization technique is presented. Moreover, to enhance the efficiency of the OFDE, linear precoding (LP) is also suggested for fast Fourier transform and wavelet transform–based filter bank transceivers over the PLC channel. Performance of the proposed LP‐based OFDM‐OFDE and LP‐based WOFDM‐OFDE systems is compared with previously proposed equalization structures in terms of bit error rate, peak‐to‐average power ratio, and computational complexity via computer simulations. Furthermore, the performance of proposed architectures is also compared with classical equalization techniques under impulse noise with different intensities. Results show that not only the proposed LP‐based WOFDM‐OFDE transceiver performs better than the previous equalization models but also the LP‐based OFDM‐OFDE at the expense of slight increment in computational complexity.

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“…The spectrum sensing measurements are deactivated during the subcarriers corresponding to the spectrum occupied by primary user. [10] Moreover, dynamic spectrum sensing can be determined when the active subcarriers are located in the unoccupied spectrum bands.…”

Section: Fig1 Nc-ofdm-based Cr System Coexisting With the Pu And Susmentioning

confidence: 99%

PAPR Reduction in NC-OFDM Based Cognitive Radio System Using Signal Cancelation and Tone Reservation

Nair¹

2017

ijecs

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High data rate wireless access is demanded by many applications. It requires more bandwidth for higher data rate transmission in any of the system. With promising technology and ever-increasing wireless devices, the spectrum is becoming scarcer day by day. In this case, using noncontiguous orthogonal frequency division multiplexing(NC-OFDM) and cognitive radio(CR) for spectrally efficient transmission are an alternative solution. High peak-to-average power ratio (PAPR) and large spectrum sidelobe power are two main drawbacks of this system. In this paper, we propose a novel signal cancelation (SC) method followed by tone reservation for joint PAPR reduction and sidelobe suppression in NC-OFDM-based CR systems. The key idea of the proposed method is to dynamically extend part of the constellation points on the secondary user (SU) subcarriers and add several SC symbols on the primary user (PU) subcarriers to generate the appropriate cancelation signal for joint PAPR reduction and sidelobe suppression. The joint PAPR reduction and sidelobe suppression can be consider as quadratically constrained quadratic program (QCQP) in SC method to obtain its optimal cancelation signal. The main idea of tone reservation method is to keep a small set of tones for PAPR reduction. Index Terms-Cognitive radio (CR), noncontiguous orthogonal frequency-division multiplexing (NC-OFDM), peak-to-average power ratio (PAPR)

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Effect of PAPR Reduction on Spectrum and Energy Efficiencies in OFDM Systems With Class-A HPA Over AWGN Channel

Cited by 62 publications

References 22 publications

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

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

Linear precoded wavelet OFDM‐based PLC system with overlap FDE for impulse noise mitigation

PAPR Reduction in NC-OFDM Based Cognitive Radio System Using Signal Cancelation and Tone Reservation

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