Title :
Simulation study of central frequency offset for time spread and despread filters
Author :
Zhou, Xiaoxin ; Oka, Ikuo ; Fujiwara, Chikato
Author_Institution :
Fac. of Eng., Osaka City Univ., Japan
Abstract :
The authors have simulated the time spread and despread filters as digital filters. Basically they work well and the possibility of constructing a CDMA network with these kinds of filters is shown. The central frequency offset problem is also discussed and it is found that it is necessary to limit the frequency offset quantity within 1/4 of a chip bandwidth in order to prevent the processing gain degradation less than 3dB. The intersymbol interference due to the ripples of the despread signals is also a problem which needs further study
Keywords :
circuit analysis computing; code division multiple access; digital filters; digital simulation; intersymbol interference; CDMA network; central frequency offset; chip bandwidth; digital filters; intersymbol interference; processing gain degradation; ripples; simulation; time spread and despread filters; Bandwidth; Binary phase shift keying; Cities and towns; Control systems; Digital filters; Frequency; Low pass filters; Multiaccess communication; Narrowband; Pulse modulation;
Conference_Titel :
Universal Personal Communications, 1993. Personal Communications: Gateway to the 21st Century. Conference Record., 2nd International Conference on
Conference_Location :
Ottawa, Ont.
Print_ISBN :
0-7803-1396-8
DOI :
10.1109/ICUPC.1993.528420
