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Special Section on Radio Access Techniques for 3G Evolution

Effect of Pulse Shaping Filters on a Fractional Sampling OFDM System with Subcarrier-Based Maximal Ratio Combining

Mamiko INAMORI, Takashi KAWAI, Tatsuya KOBAYASHI, Haruki NISHIMURA, Yukitoshi SANADA

Author information

Mamiko INAMORI
Dept. of Electronics and Electrical Engineering, Keio University
Takashi KAWAI
Dept. of Electronics and Electrical Engineering, Keio University
Tatsuya KOBAYASHI
Dept. of Electronics and Electrical Engineering, Keio University
Haruki NISHIMURA
Dept. of Electronics and Electrical Engineering, Keio University
Yukitoshi SANADA
Dept. of Electronics and Electrical Engineering, Keio University

Corresponding author

Keywords:OFDM,fractional sampling,diversity,pulse shaping filter

JOURNALRESTRICTED ACCESS

2009 Volume E92.BIssue 5Pages 1484-1494

DOIhttps://doi.org/10.1587/transcom.E92.B.1484

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Published: May 01, 2009Received: August 25, 2008Available on J-STAGE: May 01, 2009Accepted: -Advance online publication: -Revised: -

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Article overview

Abstract

In this paper, the effect of the impulse response of pulse shaping filters on a fractional sampling orthogonal frequency division multiplexing (FS OFDM) system is investigated. FS achieves path diversity with a single antenna through oversampling and subcarrier-based maximal ratio combining (MRC). Though the oversampling increases diversity order, correlation among noise components may deteriorate bit error rate (BER) performance. To clarify the relationship between the impulse response of the pulse shaping filter and the BER performance, five different pulse shaping filters are evaluated in the FS OFDM system. Numerical results of computer simulations show that the Frobenius norm of a whitening matrix corresponding to the pulse shaping filter has significant effect on the BER performance especially with a small numbers of subcarriers. It is also shown that metric adjustment based on the Frobenius norm improves BER performance of the coded FS OFDM system.

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