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Joint Optimization of peak-to-average power Ratio and Spectral Leakage in 5G Multicarrier Waveforms

China Communications 2015年第S1期12卷 83-92页

作者： WEI Peng DAN Lilin ZHOU Cheng XIAO Yue WU Gang LI Shaoqian National Key Laboratory of Science and Technology on Communications University of Electronic Science and Technology of China

High peak-to-average-power ratio(PAPR) and spectral leakage are two main drawbacks of multicarrier systems, such as in orthogonal frequency division multiplexing(OFDM), in future 5G wireless communications. For generating optimized wave forms for 5G communications, this paper proposes an iterative scheme combining time-domain N-continuous OFDM(TD-NC-OFDM) and serial peak cancellation(SPC). Based on the theory of projection onto convex sets(POCS), the effectiveness of the proposed scheme is proved, and the optimized time-frequency domain multicarrier waveforms are analyzed in terms of a balanced tradeoff between out-of-band spectral leakage and PAPR. Both theoretical analysis and simulation results show that the proposed scheme can jointly optimize both the PAPR and out-ofband radiation, with moderate computational complexity.

关键词： orthogonal frequency division multiplexing(OFDM) peak-to-average-power ratio(PAPR) spectral leakage

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A Low Complexity Linear Moving average Filtering Technique for PAR Reduction in OFDM Systems

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International Journal of Communications, Network and System Sciences 2018年第10期11卷 199-215页

作者： Hassan Ali Raziq Yaqub Department of Electrical Engineering and Computing The University of Newcastle Callaghan Australia Department of Electrical Engineering and Computer Science Alabama A&M University Normal AL USA

In this paper, a linear moving average recursive filtering technique is proposed to reduce the peak-to-average power ratio (PAR) of orthogonal frequency division multiplexing (OFDM) signals. The proposed low complexity technique is analyzed in an oversampled OFDM system and a simple distribution approximation of the oversampled and linearly filtered OFDM signals is also proposed. Corresponding time domain linear equalizers are developed to recover originally transmitted data symbols. Through extensive computer simulations, effects of the new filtering technique on the oversampled OFDM peak-to-average power ratio (PAR), power spectral density (PSD) and corresponding linear equalizers on the frequency selective Rayleigh fading channel transmission symbol-error-rate (SER) performance are investigated. The newly proposed recursive filtering scheme results in attractive PAR reduction, requires no extra fast Fourier transform/inverse fast Fourier transform (FFT/IFFT) operations, refrains from transmitting any side information, and reduces out-of-band radiation. Also, corresponding linear receivers are shown to perform very close to their frequency domain counterparts.

关键词： Moving average Filtering Recursive Filtering Orthogonal Frequency Division Multiplexing peak-to-average-power Ratio Inverse Fast Fourier Transform

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