Reducing the Peak to Average Power Ratio of MIMO-OFDM Systems

Mazin, Asim Mohamed; Crosby, Garth V.

doi:10.5121/ijcnc.2013.5303

Cited by 5 publications

(1 citation statement)

References 13 publications

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“…Significant research has been done on designing techniques for reducing the PAPR of OFDM signals. These techniques can be divided into two main categories: the first category consists of techniques based on OFDM signal design that achieves lower PAPR which implies added complexity [1][2][3][4][5][6][7]; while the second category consists of techniques based on clipping OFDM signals before power amplification [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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

Gharaibeh

2014

Int J RF and Microwave Comp Aid Eng

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Orthogonal frequency division multiplexed (OFDM) signals have high peakto-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 clipperamplifier 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.

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Section: Introductionmentioning

confidence: 99%

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

Gharaibeh

2014

Int J RF and Microwave Comp Aid Eng

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Efficient Transmission of an Encrypted Image Through a MIMO–OFDM System with Different Encryption Schemes

Dharavathu

Mosa

2020

Sens Imaging

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A Novel Pilot Expansion Approach for MIMO Channel Estimation and Tracking

Siyau

Prieto

et al. 2015

2015 IEEE International Conference on Ubiquitous Wireless Broadband (ICUWB)

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Enabling high practical mobility of MIMO-OFDM systems requires accurate channel estimation under severe frequency and time selective fading channels. Conventional methods rely on non-realistic approximations or result in impractical complexities. In this paper, a new practical trainingbased MIMO channel estimation scheme is presented. The new pilot bits designed from the 'Paley-Hadamard' matrix allows exploiting its orthogonal and 'Toeplitz-like' structures for minimising its pilot length. Additionally, a novel pilot expansion technique is proposed to estimate the length of the channel impulse response, by flexibly extending its pilot length as required to capture the number of multipath existed within the MIMO channel. The proposed pilot expansion enables to deduce the initial channel variation and its Doppler rate, which can be subsequently applied for MIMO channel tracking using decision feedback Kalman filter during the data payload.

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Reducing the Peak to Average Power Ratio of MIMO-OFDM Systems

Abstract: In this paper, we proposed a particle swarm optimization (PSO)

Cited by 5 publications

References 13 publications

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

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

Efficient Transmission of an Encrypted Image Through a MIMO–OFDM System with Different Encryption Schemes

A Novel Pilot Expansion Approach for MIMO Channel Estimation and Tracking

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