Ultra-wideband (UWB) radio is becoming a promising field for new generation’s digital communication systems. This technique, based mainly on the impulse radio paradigm, offers great flexibility and shows enormous potential in view of a future broadband wireless access. In this paper, we aim at presenting the main principles to design a multiaccess scheme based on UWB. The potential of UWB is ex...

Cognitive Radio (CR) has been proposed as a promising and effective technology to improve radio spectrum utilization. It can change its transmitter parameters depending on the environment in which it operate based on interaction. In CR, a number of different methods of spectrum sensing are used to identify the presence of signal transmission. Among them, the multitaper method (MTM), has been in...

Ultra-WideBand (UWB) has been recently presented as a promising radio technology due to the large bandwidth available. This feature enables point to point high data rates at short range as well as high temporal resolution with long channel impulse reponses (CIR). In this paper, we present an original multiple access scheme called Channel Division Multiple Access (ChDMA), where we use the CIR as...

The emerging cognitive radio system can sense and adapt to the wireless environment in which it operates. Cognitive radio with intelligent capabilities of both radio link and network layers is capable of transmitting in an optimized way across the available signal dimensions allowing a potential huge increase in the prospects for spectrum efficiency, co-existence, compatibility and interoperabi...

Recent advances in wideband impulse technology, low power communication along with unlicensed band have enabled ultra wide band (UWB) as a leading technology for future wireless applications. This paper outlines the applications of emerging UWB technology in a private and commercial sector. We further talk about UWB technology for a wireless body area network (WBAN).

Introduction Ultra-wideband (UWB) technology is a promising solution for low-complexity, low cost, low power and high-data rate wireless connectivity among devices in a personal area network. The main signal processing operations involved in a typical analog front end of a UWB receiver before demodulation are frequency translation to baseband, signal amplification and filtering to strengthen th...

Ultra-wideband (UWB) radio is a fast emerging technology with uniquely attractive features inviting major advances in wireless communications, networking, radar, imaging, and positioning systems. UWB radios offer great flexibility and shows enormous potential in view of future fourth generation (4G) broadband wireless access in dense multipath environments. In this paper jointly PHY and MAC lay...

Ultra-wideband radio, conveying data by transmitting narrow pulses without carrier, is a promising communication technology. Transmitted reference method can work with cross-correlation receivers, which have simple channel estimation and multipath diversity acquirement as well as low sampling frequency, to make a low cost application available. Optimal and suboptimal single user receivers for u...