Title :
The effect of higher receiver sensitivity on the coverage of a spread spectrum CDMA system
Author :
Yang, Samuel C. ; Payne, John ; Salkola, M.I.
Author_Institution :
California State Univ.-Fullerton, Fullerton, CA, USA
fDate :
5/1/2005 12:00:00 AM
Abstract :
We examine the effect of higher receiver sensitivity on coverage of a code division multiple access (CDMA) cellular system. The reduced system noise figure of a base station is achieved by placing low noise amplifier (LNA) between receive antenna and base station radio. Using noise figure theory, we develop an analytical model of sensitivity improvement which is a function of reverse-link noise rise and antenna noise temperature. Since CDMA has reverse power control, sensitivity improvement is manifested in the reduction of mobile transmit power. Field experiments are performed and data collected to test the model. The positive result shows that LNA can be used to reduce mobile transmit power and their loading on adjacent cells.
Keywords :
code division multiple access; microwave amplifiers; microwave antennas; microwave receivers; mobile radio; spread spectrum communication; CDMA coverage; antenna noise temperature; base station radio; cellular system; code division multiple access; low noise amplifier; mobile transmit power; receive antenna; receiver sensitivity; reverse-link noise rise; sensitivity improvement; spread spectrum systems; system noise figure; Analytical models; Antenna theory; Base stations; Low-noise amplifiers; Multiaccess communication; Noise figure; Noise reduction; Receivers; Receiving antennas; Spread spectrum communication; Code division multiple access (CDMA); coverage; low noise amplifier (LNA); spread spectrum systems;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2005.847721
