Wireless Sensor Network (WSN) has gained popularity in recent times in residential, commercial and industrial applications. Several wireless technologies have emerged ranging from short and medium distances. Bluetooth, ZigBee and Impulse Radio Ultra Wide Band (IR-UWB) are three short range wireless communications. There are several features of IR-UWB signals which make them attractive for a sho...

CMOS Integrated Circuit Design for Ultra-Wideband Transmitters and Receivers. (August 2009) Rui Xu, B.S. , Southeast University, China; M.S., Southeast University, China Chair of Advisory Committee: Dr. Cam Nguyen Ultra-wideband technology (UWB) has received tremendous attention since the FCC license release in 2002, which expedited the research and development of UWB technologies on consumer p...

UWB system that utilizes the unlicensed 3.1 – 10.6 GHz UWB band, as regulated in the United States by the Federal Communications Commission (FCC) Regulations. It is a trend that UWB and Bluetooth Technology will be combined together for developing a next-generation low-power, low-cost ad hoc networking solution that will expand Bluetooth technology’s current success. In this paper, we propose a...

MIMO techniques promise a significant boost in the capacity of wireless systems. In this paper, MIMO system is designed using a compact double-sided printed antenna having ultra-wideband and band-notched characteristic. The UWB antennas are designed on CST Microwave studio simulation software with return loss less than -10dB, and further using the results from CST, performance analysis of diffe...

In this paper, a new Ultra Wideband (UWB) channel estimation algorithm, UWB-SAGE (Space Alternating Generalized Expectation Maximization) is proposed. In the algorithm, a novel UWB signal model which is an extention of the conventional wideband signal model is employed in order to estimate the UWB channel with SAGE algorithm. The algorithm divides the measured data into individual ray paths and...

This thesis investigates the performances of the Rake receiving and the Transmitted Reference (TR) schemes for Ultra Wideband (UWB) communication systems. UWB technology has been proposed as a promising physical layer candidate for indoor wireless c:ommunications, because it offers very fine time resolution and multipath resolvability. Hovlrever, these beneficial properties also pose great chal...

This paper analyses the bit error rate (BER) and capacity behaviour of orthogonal frequency division multiplexing (OFDM) and cyclic prefix based single carrier (CP-SC) systems using amplify and forward relay (AF) with two hops wireless channel type 1 ( Rayleigh-AF-UWB) and channel type 2 (Exponentially decaying multipath-AF-UWB). We consider Saleh-Venezuela [SV] channels-CM1, CM2, CM3 and CM4 f...

The presented paper exhibits the design configuration of Microstrip Line (MS)-fed and Co-Planar Waveguide (CPW)-fed symmetrical staircase shaped, planar monopole Ultra Wideband (UWB) antennae with WLAN band rejection characteristic having sized 30x30x1.6mm. The staircase pattern in the radiating patch and the feed line’s Ushaped slot are used to achieve the UWB and notch the 5GHz WLAN band, res...

Recent developments in the field of Ultra Wide Band (UWB) radio and networks led to the definition of a new Impulse Radio (IR) UWB-based IEEE standard for low data rate communications, named IEEE 802.15.4a. A typical feature of UWB radio is a large bandwidth together with limited available emission power, as set by regulatory bodies. UWB communications may, therefore, be severely affected by ex...

| Understanding ultra-wide-band (UWB) propagation channels is a prerequisite for UWB system design as well as communication-theoretic and information-theoretic investigations. This paper surveys the fundamental properties of UWB channels, pointing out the differences to conventional channels. If the relative bandwidth is large, the propagation processes, and therefore path loss and shadowing, b...