Despite the extraordinary advances in global navigation satellite systems (GNSS), the inherent limitation of the weakness of their space-based signals makes such signals easy to block intentionally or accidentally. This makes GNSS insufficient for reliable anytime, anywhere navigation, particularly in GNSS-challenged environments, such as indoors, deep urban canyons, and GNSS-denied environment...

Abstract: Frequency drift is a serious problem in Current-Fed Wireless Power Transfer (WPT) systems. When the operating frequency is drifting from the inherent Zero Voltage Switching (ZVS) frequency of resonant network, large short currents will appear and damage the switches. In this paper, an inductance-dampening method is proposed to inhibit short currents and achieve constant-frequency oper...

In this paper, we present a synchronous event stream model overlaid on the existing GNU Radio streaming dataflow model. GNU Radio has long utilized a traditional static streaming dataflow model to interconnect modular signal processing blocks. While this model fits many radio and signal processing applications well, GNU Radio and the applied signal processing community face several pressing nee...

Cognitive radios are promising solutions to the problem of overcrowded and inefficient licensed spectrum. In this work we explore the throughput potential of cognitive communication. We summarize different cognitive radio techniques that underlay, overlay and interweave the transmissions of the cognitive user with those of the licensed users. Recently proposed models for cognitive radios based ...

This paper presents an efficient block Schur algorithm for the joint detection of several CDMA codes in third generation mobile radio systems. It can, for instance, be used in time-slotted CDMA mobile radio systems, mobile radio systems using multi carrier CDMA, and direct sequence CDMA systems. After rearranging the system matrix into a block Toeplitz matrix, the proposed block Schur algorithm...

An important aspect of Software Defined Radio is the ability to define the bandwidth of the filter that selects the desired channel. This paper first explains the importance of channel filtering. Then the advantage of analog channel filtering with a variable bandwidth in a Software Defined Radio is demonstrated. This is done by comparing the requirements of the analog-to-digital converter with ...

We study the problem of optimally choosing bearing measurement locations for localizing a stationary target in minimum time. The targets are transmitting radio tags, and bearing measurements are acquired from radio signal strength by a robot carrying a direction-sensitive radio antenna. Actively localizing radio tags has many applications in surveillance, search and rescue, and environmental mo...

We study the problem of optimally choosing bearing measurement locations for actively localizing a stationary target in minimum time. The targets are transmitting radio tags, and bearing measurements are acquired from radio signal strength by a robot carrying a directionally-sensitive radio antenna. Actively localizing radio tags has many applications in surveillance, search and rescue, and env...

Spread-spectrum packet radio networks are currently being considered for use in the factory of the future. These networks have the resistance to fading and the inherent multiple access capability that are necessary to interconnect the Autonomous Guided Vehicles (AGVs) and other mobile machines and personnel that will be used in the future factory. This paper reports on progress in the design an...