Reducing the Calibration Effort for Location Estimation Using Unlabeled Samples

WLAN location estimation based on 802.11 signal strength is becoming increasingly prevalent in today's pervasive computing applications. As alternative to the wellestablished deterministic approaches, probabilistic location determination techniques show good performance and become more and more popular. However, in order for these techniques to achieve a high level of accuracy, adequate training samples should be collected offline for calibration. As a result, a great amount of manual effort is incurred. In this paper, we aim to solve the problem by reducing both the sampling time and the number of locations sampled in constructing the radio map. A learning algorithm is proposed to build location estimation systems based on a small fraction of the calibration data traditional techniques require and a collection of user traces that can be cheaply obtained. Our experiments show that unlabeled user traces can be used to compensate the effects of reducing calibration effort and even ...

• Type: Conference
• Year: 2005
• Where: PERCOM
• Authors: Xiaoyong Chai, Qiang Yang
• Keywords: Calibration Effort, PERCOM 2005, Unlabeled User Traces, Wireless Networks, WLAN Location Estimation