A technique for detecting AMPS intermodulation distortion in an IS-95 CDMA mobile

Author

Gray, Steven D. ; Kenney, Thomas

Author_Institution

Nokia Mobile Phones, San Diego, CA, USA

Volume

2

fYear

1997

fDate

1-4 Sep 1997

Firstpage

361

Abstract

When IS-95 CDMA mobiles are close to an AMPS base station, the radio frequency portion of the mobile often produces product signals in the baseband CDMA signal. In some cases, AMPS products will decrease the demodulation performance causing the IS-95 CDMA mobile to drop a call. To minimize the impact to existing mobile receiver designs, a technique is described for reducing intermodulation products by first detecting when the products are significant and then switching the low noise amplifier in the IS-95 CDMA mobile between a high and low gain state. This paper presents a detector for AMPS intermodulation products and the performance of this detector using data collected in CDMA networks in Los Angeles

Keywords

UHF amplifiers; cellular radio; code division multiple access; demodulation; interference suppression; intermodulation distortion; radio receivers; radiofrequency interference; 800 MHz; AMPS base station; AMPS intermodulation distortion; IS-95 CDMA mobile; Los Angeles; baseband CDMA signal; demodulation performance; high gain state; intermodulation products; low gain state; low noise amplifier; mobile receiver designs; product signals; Base stations; Baseband; Demodulation; Detectors; Intermodulation distortion; Multiaccess communication; Noise reduction; RF signals; Radio frequency; Receivers;

fLanguage

English

Publisher

ieee

Conference_Titel

Personal, Indoor and Mobile Radio Communications, 1997. Waves of the Year 2000. PIMRC '97., The 8th IEEE International Symposium on

Conference_Location

Helsinki

Print_ISBN

0-7803-3871-5

Type

conf

DOI

10.1109/PIMRC.1997.630945

Filename

630945