“Ultra-wideband technology holds great promise for a vast array of new applications that have the potential to provide significant benefits for public safety, businesses and consumers in a variety of applications such as radar imaging of objects buried under the ground or behind walls and shortrange, high-speed data transmission”[FCC,2002] This quote focuses the level of importance of UWB techn...

Ultra-wideband (UWB) radars are sensors allowing to track people in critical environments and situations. The results reached by single UWB sensors for such applications have shown that they are able to detect and track a person very well in a single person scenario. However, in multiple moving person scenarios, the ability of a single UWB sensor to detect several persons is usually significant...

Recently, a lot of attention was paid to UWB IR systems since it is a promising technique for low-complexity low-power short range indoor wireless communications [1-3]. When such transmissions are applied in multiple access system, time-hopping (TH) spreading codes are a plausible choice to separate different users [4-6]. The time-reversal (TR)-based UWB scheme has been extensively investigated...

Cancer is the main killing disease and breast cancer is the most common tumor among women. Compared to other cancers, the survival rate in case of breast cancer is high when detected early. Therefore intense screening programs are initiated. The standard for detection of breast cancer is mammography, which has several disadvantages such as ionizing radiation, high false-positive and false-negat...

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 ultra-wideband (UWB) system, which transmits information using nanosecond or even sub-nanosecond pulses, has been widely applied in precise positioning. In this paper, we investigate the problem of time arrival (TOA) estimation and direction (DOA) UWB systems with antenna array propose a joint TOA DOA algorithm doubled frequency sample points extended number clusters. Specifically, proposed...

This paper discusses a fast and efficient focusing algorithm for ultra wideband (UWB) stepped-frequency continuouswave (SFCW) side-looking SAR image formation. Conventional SFCW SAR focusing algorithms are mostly based on the matched filter concept. Their frequency-domain implementation is burdensome. In this paper we present a more rapid and efficient algorithm for real-time and automatic UWB ...

In this paper a new UWB textile slot antenna has been designed with high precision. This work aimed to makecloser steps towards real wearability by investigating the possibilities of designing wearable UWB antenna wheretextile materials are used for the substrate as well as the conducting parts of the designed antenna. The antenna iscomposed of three textile layers: the top and bottom are condu...