Statistical Approach to Mitigating 3G Interference to GPS in 3G Handset

Abstract

In this paper, we show how statistical decision theory can be used to solve real life product problems. Global Positioning System (GPS) performance in a mobile handset degrades whenever it is simultaneously used with a 3G data or voice service. This degradation is due to the 3G transmitter interference. Mitigation methods to interference in GPS have been proposed. However, most of these methods depend on hardware and signal processing or just hardware solutions. In some cases, it maybe difficult to implement these hardware methods, especially in mobile handsets due to its small size, printed circuit board (PCB) layout issues and the added cost. In this paper, a novel signal processing statistical algorithm approach is proposed to mitigate the 3G interference to GPS. This statistical approach utilizes the knowledge of the statistical characteristics and distributions of both the GPS signal and noise. Then the method utilizes the probabilities to make a statistical decision to remove the effect of noise. This method does not require room on the PCB of the mobile handset and therefore no layout challenges arise. In addition, cost is minimized and the product turn in cycle is shortened. This paper offers theoretical as well as practical insight to the GPS operation during 3G call inside the mobile phone.

Benefits of Mobile Phone Technology for Personal Environmental Monitoring

“…On the other hand, the present assessment of geolocation accuracy is based on the comparison against a GPS tracker, and it is well known that GPS trackers are affected by environmental factors (ie, visibility and geometry of satellites) [43,48]. So, the distance between mobile phone–based CalFit and GPS tracker may not reflect the lack of geolocation accuracy of mobile phone when the geometry and visibility of satellites were challenging [14,49], but this approach was the most feasible because the 3098 unscripted trips assessed. Furthermore, because of the comparison between the distances to GPS tracker and the distances to nearest street, we know that the lack of accuracy was more a matter of data acquisition than spatial error on the coordinates.…”

Effect of different interferer data rates on GPS acquisition

“…GPS service in smartphones co-exists with the over the air (OTA) technologies GSM and WCDMA in 3G networks [1], [2] and [3]. Such a co-existence stipulates degradation in the GPS performance and operation under usually normal carrier operations.…”

Performance Assessment of Maximum Likelihood in the Detection of Carrier Interference Corrupted GPS Data in Mobile Handsets

“…The received signal B g is processed by the algorithm in [3] on the chip level in the Acquisition step. The detector, which is part of the Acquisition, tries to decide/estimate [4] which one of the u v 's was truly transmitted before it was corrupted by noise.…”