Title :
Quadrature splitter considerations for digital cellular radio
Author :
Chen, X. ; Lodge, J.H. ; Scott, K.E. ; Sendyk, A.M.
Author_Institution :
NovAtel Communications Ltd., Calgary, Alta., Canada
Abstract :
A quadrature splitter for converting a narrowband bandpass IF or RF signal into baseband inphase and quadrature phase signals is evaluated in a high IF cellular digital radio system with a total bandwidth of 25 MHz. The results show that the simple splitter causes spectrum residues due to the relatively small ratio of sampling frequency to total signal bandwidth. These spectrum residues result in spectrum overlap between a pair of two channels symmetrically located on either side of the center IF frequency. To accommodate the cellular radio application, two alternative splitters are designed and simulated. The improved splitters provide better performance with the cost of higher complexity. The performance and structure trade offs are presented
Keywords :
cellular radio; digital radio systems; radio equipment; 25 MHz; baseband inphase signals; digital cellular radio; narrowband bandpass IF signal; narrowband bandpass RF signal; quadrature phase signals; quadrature splitter; sampling frequency; spectrum overlap; spectrum residues; Bandwidth; Costs; Digital communication; Digital filters; Land mobile radio cellular systems; Narrowband; RF signals; Radio frequency; Sampling methods; Transfer functions;
Conference_Titel :
Signals, Systems and Computers, 1992. 1992 Conference Record of The Twenty-Sixth Asilomar Conference on
Conference_Location :
Pacific Grove, CA
Print_ISBN :
0-8186-3160-0
DOI :
10.1109/ACSSC.1992.269200
