Ultra-wideband (UWB) uses narrow band pulses of nano-seconds to provide high data rate communications .These narrow pulses spread the energy across a wide frequency band that is why it is called ultra-wideband. In this paper, we will discuss the UWB pulse modulation and multiple access modulation schemes using Pulse Position Modulation technique .The simulations are done in MATLAB software.

A novel ultra-broadband printed monopole antenna with 10 dB return loss bandwidth from 2.1-21.5GHz is proposed. This printed monopole antenna is constructed using cross-slotted modified circular patch with etched ground plane. This UWB printed monopole antenna is microstrip-fed with a triangular tapered input line for broadband matching.

We propose the use of cooperative communication among single-antenna users to enhance the performance of ultrawideband networks. We consider the amplify-and-forward cooperative protocol in the multiband OFDM setting using practical channel measurements.

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In this paper a multiband UWB signal with polarization diversity is considered in order to maintain as constant as possibile the performance (and consequently the QoS) of a short range communication link.

The ultra-wideband wireless personal area networks are expected to be most commonly employed in desktop environments. This paper presents a measurement campaign conducted on a typical office desk. A pair of omnidirectional UWB antennas and a vector network analyzer were used to measure the impulse responses over a frequency range spanning from 6 GHz to 8.5 GHz, in accordance with the UWB regula...