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Frequency Domain Equalization of CAZAC-OFDM with Transversal Filter using LMS Algorithm

Authors:
Hiroyuki Yamano
Yoshitsugu Sugai
Masahiro Muraguchi

Keywords: OFDM; CAZAC sequence; Frequency domain equalization; Transversal filter; LMS algorithm.

Abstract:
In wireless communications, signals are affected by multipath fading in the transmission channel, which causes amplitude fluctuation and phase fluctuation at the receiver front-end. Unfortunately, the Frequency Domain Equalization (FDE) using pilot subcarriers, which is ordinary used in conventional Orthogonal Frequency Division Multiplex (OFDM) systems, cannot apply the OFDM system with Constant Amplitude Zero Auto-Correlation (CAZAC) precoding, CAZAC-OFDM. In this paper, we propose a method to improve the negative effect of multipath fading by applying transversal filter using Least Mean Square (LMS) algorithm to CAZAC-OFDM systems. We have confirmed that the CAZAC-OFDM system with the proposed transversal filter maintains enough low Bit Error Rate (BER) performance under flat fading and frequency selective fading channels.

Pages: 99 to 104

Copyright: Copyright (c) IARIA, 2019

Publication date: July 28, 2019

Published in: conference

ISSN: 2308-4030

ISBN: 978-1-61208-727-6

Location: Nice, France

Dates: from July 28, 2019 to August 2, 2019