Title :
The effect of frequency offsets on the performance of FLEX(R) simulcast systems
Author :
Souissi, Slim ; Sek, Stephen ; Xie, Hai
Author_Institution :
Motorola Messaging Syst. Product Group, Fort Worth, TX, USA
Abstract :
Zero-beating is a phase cancellation u` condition that occurs when two or more transmitters send the same data at slightly offset frequency. It results in periodic signal cancellations which degrade the coverage performance of simulcast systems. This paper presents a comprehensive study of the zero-beating effect that occurs in simulcast environments. Zero-beating is characterized in the time, frequency, and spatial domains. The simulcast performance of FLEX(R) simulcast systems is evaluated through computer simulations, laboratory tests and field measurements. Based on the obtained results, a frequency offset plan that enhances FLEX(R) simulcast performance is recommended
Keywords :
digital simulation; frequency-domain analysis; interference suppression; paging communication; protocols; time-domain analysis; FLEX simulcast systems; computer simulations; coverage performance; field measurements; frequency domain; frequency offsets; global de facto standard; high-speed paging; laboratory tests; periodic signal cancellation; phase cancellation; spatial domain; time domain; transmitters; zero-beating; zero-beating effect; Computer simulation; Degradation; Distortion; Electronic mail; Frequency; Laboratories; Message service; Protocols; System testing; Transmitters;
Conference_Titel :
Vehicular Technology Conference, 1999 IEEE 49th
Conference_Location :
Houston, TX
Print_ISBN :
0-7803-5565-2
DOI :
10.1109/VETEC.1999.778490
