The performance of GMSK as a modulation scheme for direct sequence CDMA

Author

Aldis, J.P. ; Barton, S.K.

Author_Institution

Dept. of Electr. Eng., Bradford Univ., UK

fYear

1994

fDate

4-6 Jul 1994

Firstpage

554

Abstract

The processing gain of a direct sequence spread spectrum communications system using GMSK modulation is analysed. Multiple access interference is considered, rather than broadband white noise. Monte-Carlo methods are used. It is shown that the processing gain in a GMSK based system is lower than is possible in an equivalent system using QPSK. It is further shown that this processing gain need not be lost if adjacent systems are allowed to overlap in frequency. The optimum time-bandwidth product is found to be between 0.1 and 0.2

Keywords

Monte Carlo methods; code division multiple access; minimum shift keying; pseudonoise codes; radiofrequency interference; spread spectrum communication; GMSK; Monte-Carlo methods; QPSK; direct sequence CDMA; direct sequence spread spectrum communications; modulation; multiple access interference; optimum time-bandwidth product; processing gain; Energy consumption; High power amplifiers; Interference; Land mobile radio cellular systems; Multiaccess communication; Phase modulation; Quadrature phase shift keying; Robustness; Spread spectrum communication; White noise;

fLanguage

English

Publisher

ieee

Conference_Titel

Spread Spectrum Techniques and Applications, 1994. IEEE ISSSTA '94., IEEE Third International Symposium on

Conference_Location

Oulu

Print_ISBN

0-7803-1750-5

Type

conf

DOI

10.1109/ISSSTA.1994.379524

Filename

379524