This paper includes a new technique for media access control (MAC) in the Ultra Wide Band (UWB) spectrum. We use a TDMA based protocol that utilizes Multiband Impulse-based Ultra Wideband (MI-UWB). The proposed MAC protocol (UWB-MAC) uses TDMA on multiple bands to maximize throughput for streaming media applications. This is accomplished by using MI-UWB in combination with TDMA on multiple chan...

This work investigates the use of Time Reversal (TR) applied to UWB systems for communication and positioning applications. Potential performance boosts, that are achievable over a single UWB communication link by the sole adoption of TR, are investigated. In the case of multiuser UWB communications, it is shown that TR modifies the distribution of Multi User Interference (MUI) and that further...

For an indoor ultra-wideband (UWB) communication system, the line-of-sight (LOS) between the transmitter and receiver may be frequently blocked by moving people. Blocking of LOS may significantly affect the quality of service of on-going UWB communications. Based on the Angular Power Spectrum Density and the human blocking models, we build a packet-level UWB channel model considering the shadow...

This dissertation investigates Ultra-Wideband (UWB) techniques for the next generation Radio Frequency Identification (RFID) towards the Internetof-Things (IoT). In particular, an ultra-high frequency (UHF) wireless-powered UWB radio (UHF/UWB hybrid) with asymmetric links is explored from system architecture to circuit implementation. Context-aware, location-aware, and energy-aware computing fo...

Chaotic signals are ultra-wideband signals that can be generated with simple circuits in any frequency bands at arbitrary power level. The ultra-wideband property of chaotic carriers is beneficial in indoor and mobile applications where multipath propagation limits the attainable bit error rate. Another possible application is the ultra-wideband (UWB) radio, where the spectrum of transmitted si...

Ultra-wideband (UWB) technique has become one of the most fascinating technologies with various antennas. It has the merits of high speed transmission rate, low power consumption and simple hardware configuration over conventional wireless communication systems. The research and development of the UWB systems including antennas have been widely performed [1-5]. Recently, UWB systems have focuse...

Performances of multiband orthogonal frequency division multiplexing (MB-OFDM) and direct sequence based ultra wideband (DS-UWB) systems are studied in interfered multipath channel. The radio channel is based on the modified Saleh-Valenzuela model. The studies related to the comparison between MB-OFDM and DS-UWB within interference seems to be unsubstantial in the literature. Therefore, it is c...

Due to the recent advances in ultrawideband (UWB) radar technologies, there has been widespread interest in the medical applications of this technology. We propose the multimodal combination of magnetic resonance (MR) and UWB radar for improved functional diagnosis and imaging. A demonstrator was established to prove the feasibility of the simultaneous acquisition of physiological events by mag...

An important application of wireless sensor networks is monitoring factory systems and devices. Typical narrowband radios may be forced to increase their radiated power to maintain network connectivity in the harsh radio environment of a factory. I-UWB radios have many advantages over narrowband radios in a sensor network. However, the radiated power of I-UWB radios is severely limited by regul...

Ultra-WideBand (UWB) systems having a bandwidth on the order of a Gigahertz have recently received wide attention both in the USA and in Europe. In this contribution a novel UWB multiple access scheme based on the well-known family of Frequency-Hopping Multiple Access (FHMA) techniques is proposed, where the associated FH is implemented using MultiStage Frequency Hopping Multiple Access, or MS/...