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5G Candidate Waveforms Comparison Regarding Time-Frequency Resources in the Nonlinear HPA

Authors:
Heung-Gyoon Ryu

Keywords: OFDM; FBMC; UFMC; WOLA-OFDM; HPA nonlinearity

Abstract:
New waveforms for the 5th generation cellular system have been studied in many ways. The sharper out-of-band (OOB) spectrum characteristics are greatly desired for improving the spectrum efficiency. Generally, universal filtered multi-carrier (UFMC), filter bank multi-carrier (FBMC) and weighted overlap and add orthogonal frequency division multiplexing (WOLA-OFDM) waveforms are regarded as strong waveform candidates for the 5th generation mobile system. Similar to the conventional orthogonal frequency division multiplexing (OFDM) system, these modulation methods use multi-carrier. So, these systems have high peak to average power ratio (PAPR), which can cause nonlinear distortion and the outof- band (OOB) power will increase because of the nonlinear high power amplifier (HPA). In this paper, we evaluate the spectrum characteristic and bit error rate (BER) performance of the waveforms under the effect of nonlinear HPA. Also, we show the comparison of the time-frequency resources of each system because it is very important to estimate the spectral efficiency and communication throughput. As simulation results, it is confirmed that the OOB power of each system increases, and the OOB power increase of the FBMC system is the largest. We provide the comparison table for the time-frequency resources requirement for the each multi-carrier system.

Pages: 13 to 17

Copyright: Copyright (c) IARIA, 2017

Publication date: April 23, 2017

Published in: conference

ISSN: 2308-3964

ISBN: 978-1-61208-544-9

Location: Venice, Italy

Dates: from April 23, 2017 to April 27, 2017