Improved modulation techniques for wireless communications: raised cosine filtered FQPSK-FQPSK(RC)

Author

Yan, Hongying ; Feher, Kamilo

Author_Institution

Digital Wireless Commun. Lab., California Univ., Davis, CA, USA

Volume

43

Issue

2

fYear

1997

fDate

6/1/1997 12:00:00 AM

Firstpage

221

Lastpage

226

Abstract

An improved spectrally efficient modem scheme is proposed for wireless communications. This new scheme is based on nonlinear base band processor, with additional filtering to reduced the spectral spreading. Its spectral efficiency is improved up to 20%, comparing with GMSK. Additional filtering is a square root of raised cosine filter with a varying between 0.2 and 0.5. The performance of this technique has been evaluated in both AWGN and Rayleigh fading channels. This new spectral efficient modem is as robust as GMSK in interference limited fading environment and increases the capacity 20%

Keywords

Gaussian channels; Rayleigh channels; cellular radio; channel capacity; fading; filtering theory; modems; quadrature phase shift keying; radio equipment; radiofrequency interference; signal processing; spectral analysis; AWGN channels; GMSK; Rayleigh fading channels; capacity; cellular environment; filtering; interference limited fading environment; modem; modulation techniques; nonlinear baseband processor; performance; raised cosine filtered FQPSK; spectral efficiency; spectral spreading reduction; square root; wireless communications; AWGN; Band pass filters; Bit error rate; Degradation; Frequency; Low pass filters; Modems; Quadrature phase shift keying; Transfer functions; Wireless communication;

fLanguage

English

Journal_Title

Broadcasting, IEEE Transactions on

Publisher

ieee

ISSN

0018-9316

Type

jour

DOI

10.1109/11.598373

Filename

598373