In this paper, Ultra-wideband (UWB) multiple access relay channel with correlated noises at the relay and receiver is investigated. We obtain outer and inner bounds for the IEEE 802.15.3a UWB multiple access relay channel, and also, a diversity gain bound. Finally, we evaluate some results numerically and show that noise correlation coefficients play important role in determining relay position.

The paper presents a method of designing ultrawide band (UWB) pulse array beamformer in the case of nearfield. Firstly the principle of space-time processing of UWB pulse array is discussed. The radical beampattern transform based on spherical coordinates is employed to solve the nearfield beamforming of UWB pulse array. The frequency invariant technology is considered for the frequency depende...

In some GPS failure conditions, positioning for mobile target is difficult. This paper proposed a new method based on INS/UWB for attitude angle and position synchronous tracking of indoor carrier. Firstly, error model of INS/UWB integrated system is built, including error equation of INS and UWB. And combined filtering model of INS/UWB is researched. Simulation results show that the two subsys...

The Ultra Wide Band (UWB) is a promising indoor positioning sensor. Its precise range measurement and wall penetration capability are well suited for indoor navigation. UWB anchor locations must also be carefully determined to achieve the optimal performance of a UWB positioning. However, previous approaches on the UWB anchor placement resulted in poor positioning accuracy around corners of an ...

In modern short range wireless applications, RF, Bluetooth and UWB communication schemes are recommended with respect to power consumption, low/high data rates and location capability. Though special bandwidth is not allocated to UWB, coexistence of such signal in the available RF environment is a critical issue and hence analysis of UWB signal with respect to interference is very much required...

This paper presents the results of a co-existence study investigating the impact of ultra wideband (UWB) interference on an IEEE802.11b network. Results are based on the experimental test measurements made at the University of Oulu, Finland using simple non-FCC compatible, high power UWB transmitters as interference sources. Preliminary results showed that the IEEE802.11b network suffered sligh...

In February of 2002, the FCC approved the use of ultra-wideband (UWB) technology for commercial use. UWB has since been considered as a solution for the next generation of personal area networks (PANs) and wireless local area networks (WLANs). UWB (or impulse) radio employs short duration pulses to communicate, thereby spreading signal energy very “thinly” from DC to a few gigahertz [1]. The “u...

This document is about the “UWB co-existence analysis” to be published as an Ultrawaves deliverable D2.2. The document covers the co-existence studies between ultra wideband and other radio systems. If UWB systems will be adopted in a common use globally, or only in Europe, an inevitable consequence is that the UWB co-existence issues will have more and more significant role in the near future ...

In this paper, the impact of timing jitter in direct sequence ultra wideband (DS-UWB) system is investigated over multipath fading channel. Also, a novel hybrid direct sequence multiband UWB (DS-MBUWB) system is proposed to mitigate the impact of timing jitter. We analyze and compare the system performance for conventional DS-UWB and hybrid DS-MB-UWB with Rake receiver in the presence of timing...

Band-notch characteristic has been of great interest recently to overcome the electromagnetic interference of Ultra-wideband systems (UWB) with other existing ones. In this paper, we present a novel microstrip-fed antenna with band rejection property appropriate for UWB applications. Band-notch characteristic has been achieved by adding a rectangular resonant element to the ground section. A pr...