Spectrum shaping in N-channel QPSK-OFDM systems

Author

Bhatoolaul, D. ; Wade, G.

Author_Institution

Commun. Group, Plymouth Univ., UK

Volume

142

Issue

5

fYear

1995

fDate

10/1/1995 12:00:00 AM

Firstpage

333

Lastpage

338

Abstract

A compact time-domain treatment of a complete spectrum shaped N-channel orthogonal FDM system is presented, enabling practical DSP algorithms for modulation and demodulation to be clearly identified. The resulting DSP architecture is an alternative to previously described OQPSK-OFDM systems and directly provides the two complex samples per symbol required for symbol timing recovery. The paper also discusses parameter selection for the polyphase shaping filters and compares simulation results of power spectral density for shaped and unshaped systems. Simulation shows that shaped systems can closely approach the ideal transmission spectrum even for modest values of N

Keywords

demodulation; filtering theory; frequency division multiplexing; quadrature phase shift keying; signal processing; spectral analysis; telecommunication channels; time-domain analysis; DSP algorithms; N-channel QPSK-OFDM systems; compact time-domain treatment; demodulation; modulation; orthogonal frequency division multiplexing; parameter selection; polyphase shaping filters; power spectral density; shaped systems; spectrum shaping; symbol timing recovery; unshaped systems;

fLanguage

English

Journal_Title

Vision, Image and Signal Processing, IEE Proceedings -

Publisher

iet

ISSN

1350-245X

Type

jour

DOI

10.1049/ip-vis:19952240

Filename

487794