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A Proposal for a New OFDM Wireless System Using a CAZAC Equalization Scheme

Authors:
Ryota Ishioka
Tomotaka Kimura
Masahiro Muraguchi

Keywords: OFDM; CAZAC sequence; Zadoff-Chu sequence; PAPR reduction

Abstract:
It is well known that one of the most serious drawbacks of the orthogonal frequency division multiplexing (OFDM) scheme in wireless applications is its high peak-to-average power ratio (PAPR), which decreases the efficiency of power amplifiers (PAs) and increases transmitter power consumption. We propose a constant amplitude zero auto-correlation (CAZAC) equalization scheme, which is a robust way of overcoming the PAPR problems with the OFDM scheme. The CAZAC equalization scheme makes the PAPR of multilevel quadrature amplitude modulation (M-QAM) OFDM signals into the PAPR of M-QAM single-carrier signals. This paper proposes a new wireless system that introduces the CAZAC equalization scheme. CAZAC improves the estimated power-added efficiency of the PAs for a 16-QAM OFDM system with 52 subcarriers from 10 to 30% because it reduces the PAPR of 5 dB while the system imposes no penalties on the bit error rate (BER). The paper also provides theoretical analysis of CAZAC equalization and information on spectral control and the efficiency of BER under fading environments.

Pages: 45 to 49

Copyright: Copyright (c) IARIA, 2017

Publication date: June 25, 2017

Published in: conference

ISSN: 2308-4030

ISBN: 978-1-61208-562-3

Location: Venice, Italy

Dates: from June 25, 2017 to June 29, 2017