The democratization of wireless networks combined to the emergence of mobile devices increasingly autonomous and efficient lead to new services. Positioning services become overcrowded. Accuracy is the main quality criteria in positioning. But to better appreciate this one a coefficient is needed. In this paper we present Geometric and Signal Strength Dilution of Precision (DOP) for positioning...

Location estimation of mobile phones has received considerable interest in the eld of wireless communications In this pa per a simple and e cient positioning algo rithm using received signal strength measure ments obtained from at least three base stations are developed Our proposed method is based on solving a nonconvex constrained weighted least squares problem Simulation results show that th...

With the rapid spread of various mobile terminals in our society, the importance of secure positioning is growing for wireless networks in adversarial settings. Recently, several authors have proposed a secure positioning mechanism of mobile terminals which is based on the geometric property of wireless node placement, and on the postulate of modern physics that a propagation speed of informati...

Odometry is the most widely used method for determining the momentary position of a mobile robot. In most practical applications odometry provides easily accessible real-time positioning information in-between periodic absolute position measurements. The frequency at which the (usually costly and/or time-consuming) absolute measurements must be performed depends to a large degree on the accurac...

In this research we attempt to build a multi cooperative mobile robot system able to perform the process of steering people in indoors. When a target-group is integrated by several persons, steering task is more difficult to accomplish, specially when only a robot is intended to be used. Since that, the problem can be overcomed if we consider that a cooperative mobile robot system’s performance...

This paper introduces the principles of interferometry to multicarrier code division multiple access (MC-CDMA). Specifically, we propose the use of MC-CDMA with novel carrier interferometry (CI) complex spreading codes. The CI/MC-CDMA method, applied to mobile wireless communication systems, offers enhanced performance and flexibility relative to MC-CDMA with conventional spreading codes. Speci...

This paper addresses the coupled tasks of constructing a spatial representation of the environment with a mobile robot using noisy sensors (sonar) and using such a map to determine the robot's position. The map is not meant to represent the actual spatial structure of the environment so much as it is meant to represent the major structural components of what the robot \sees". This can, in turn,...

This paper presents a WiFi-aided magnetic matching (MM) algorithm for indoor pedestrian navigation with consumer portable devices. This algorithm reduces both the mismatching rate (i.e., the rate of matching to an incorrect point that is more than 20 m away from the true value) and computational load of MM by using WiFi positioning solutions to limit the MM search space. Walking tests with Sams...

Positioning in wireless networks is today mainly used for yellow page services, but its importance will grow when emergency call services become mandatory and with the advent of more advanced location based services and mobile gaming. It is also plausible that future resource management algorithms may rely on position estimation and prediction. We will in this survey paper discuss and illustrat...

Wireless Communication is an application of science and technology that has come to be vital for modern existence. From the early radio and telephone to current devices such as mobile phones and laptops, accessing the global network has become the most essential and indispensable part of our lifestyle. Wireless communication is an ever developing field, and the future holds many possibilities i...