Analysis of 3G Noise to GPS in 3G Handsets

摘要

In this article, an analysis ofW-CDMA and GSM TX noises and their effects on global positioning system (GPS) performance inside a 3G mobile handset is introduced. The existence of GPS and other services and features in a mobile handset present a challenge to GPS performance. Particularly challenging are carriers like GSM and W-CDMA. The transmitter (TX) of the cellular service interferes with the performance of GPS, due to high TX power and TX band noise leaking into the GPS band. The degradation will be in the form of an increase in the total system noise figure (-5.5 dB). The total system noise figure will contribute a dB-for-dB in sensitivity degradation that is an approximately 5.5 dB loss in received signal strength. The loss in the received signal power leads to loss of reliable and accurate service and most importantly loss of service in areas where it is needed most.