Title :
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
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;
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
DOI :
10.1109/ISSSTA.1994.379524
