Title :
Effects of CDMA transmitter filtering in overlay systems
Author :
Rainbolt, Bradley J. ; Miller, Scott L.
Author_Institution :
Wireless Commun. Lab., Florida Univ., Gainesville, FL, USA
Abstract :
An application that has been proposed is the overlay of a code division multiple access (CDMA) system on a frequency band that is also populated by narrowband users from another system. The two systems can coexist in the same frequency band as a result of their intrinsic properties. This paper focuses on the degradation in the performance of the narrowband system and how it can be lessened. In particular, we expand on an idea proposed by Davis (1993), the use of a notch filter at the CDMA transmitter to avoid frequency bands currently occupied by narrowband users. It is shown that without this filtering, the overlay of a CDMA system renders the existing narrowband system inoperable
Keywords :
Gaussian channels; code division multiple access; filtering theory; matched filters; notch filters; phase shift keying; radio transmitters; AWGN channel; BPSK; CDMA system; code division multiple access; frequency band; matched filter receiver; narrowband system; notch filter; overlay systems; performance; transmitter filtering; AWGN; Binary phase shift keying; Filtering; Frequency; Matched filters; Multiaccess communication; Narrowband; Pulse shaping methods; Shape; Transmitters;
Conference_Titel :
MILCOM 97 Proceedings
Conference_Location :
Monterey, CA
Print_ISBN :
0-7803-4249-6
DOI :
10.1109/MILCOM.1997.646734
