Title :
Analysis of fade margins for soft and hard handoffs in cellular CDMA systems
Author_Institution :
Dept. of Comput. Eng. & Inf. Technol., City Univ. of Hong Kong, China
fDate :
5/1/2003 12:00:00 AM
Abstract :
The effect of handoff techniques on fade margin is investigated. We provide an accurate comparison for soft and hard handoffs in a two-cell system. An upper bound on the fade margin for hard-handoff systems is derived and an approximation formula is obtained empirically. Simulation results show that this approximation is very accurate over reasonable ranges of system parameters. Extension of our analysis to multiple-cell systems are illustrated using a three-cell system as an example.
Keywords :
approximation theory; cellular radio; code division multiple access; fading channels; multiuser channels; approximation formula; cellular CDMA systems; fade margins; handoff techniques; hard handoff; macrodiversity; multiple-cell systems; simulation results; soft handoff; system parameters; three-cell system; two-cell system; upper bound; Base stations; Diversity methods; Fading; Hysteresis; Information technology; Multiaccess communication; Power system modeling; Random variables; Upper bound; Viterbi algorithm;
Journal_Title :
Wireless Communications, IEEE Transactions on
DOI :
10.1109/TWC.2003.811190
