Ultra-wideband impulse radio (UWB-IR) sensor network has intensive military and commercial applications. However, the interference between UWB and other existed networks should be casually investigated. In this paper, we consider interference mitigation in UWB sensors in the context of cognitive radio (CR). Firstly, we suggest a general state transitionmodel to characterize the working states e...

From the radar and military research world’s, the Ultra-WideBand Impulse Radio (UWB-IR) was adopted in the telecommunications world in the 1990’. Currently, the UWB-IR technology is an interesting candidate for close range Wireless Sensors Networks (WSNs). It is particularly attractive for industrial sensor networks due to its resilience to multipath interference, simple transceiver circuitry, ...

The challenges related to the deployment of ultrawideband (UWB) radios are posed in terms of interference issues that UWB radio systems will encounter. The problem of coexistence with a Global Positioning System (GPS) receiver is used as an experimental example. Calculation of an upper bound to UWB transmitter power illustrates the effect of one possible type of regulation for a given UWB anten...

In this paper, we address a performance evaluation of Time Hopping Ultra-Wideband (TH-UWB) transmission with proposed procedures, based on Pulse Position Modulation (PPM) and considering IEEE 802.15.3a Channel Models (CM1, CM2, CM3, CM4). Moreover, a Selective Rake (S-Rake) receiver is designed to counter the effects of multipath fading occurring in UWB channel Models. The TH-UWB signal detecti...

In the previous correspondence we introduced a binary double error correcting long code (8 2 5), for 100% data correction. This paper evaluates the BER performance of UWB system using (8 2 5) code over UWB (SV) channel for image transmission. The simulation results presented here uses BPSK, as well as 2dimensional Hermite pulse modulation. Image to be transmitted over UWB channel is compressed ...

In most existing transmitted-reference ultra-wideband (TR-UWB) communication systems, receivers use the standard Gaussian approximation (SGA) for multiuser interference (MUI). It is an assumption used in most conventional multiuser systems, where the MUI tends to a Gaussian process by the central limit theorem, and convergence is relatively fast with respect to the number of users. However, for...

A new microstrip ultra-wideband (UWB) bandpass filter (BPF) with triple-notched bands is presented in this paper. The circuit topology and its corresponding electrical parameters of the initial microstrip UWB BPF are desired by a variation of genetic algorithm (VGA). Then, triple-notched bands inside the UWB passband are implemented by coupling a square ring short stub loaded resonator (SRSSLR)...

Delay-Hopped Transmitted-Reference(DHTR) is an attractive scheme for Ultra-wideband(UWB) systems. It relieves the channel estimation and the synchronization problems, which simplifies the UWB system. This paper presents a platform developed at Delft University of Technology. The purpose of the platform is to supply a hardware environment to implement DHTR UWB components. It can emulate real UWB...

This paper presents the design of a compact ultra-wideband (UWB) bandpass planar filter with a tunable notched band within the bandwidth. The filter can be used for wireless communications within the unlicensed UWB range (3.1-10.6 GHz). The UWB filter is based on external interdigitated quarterwavelength microstrip resonators and a central half-wave microstrip resonator embedding a reconfigurab...

UWB is a very attractive technology for many applications. It provides many advantages such as fine resolution and high power efficiency. Our interest in the current study is the use of UWB radar technique in microwave medical imaging systems, especially for early breast cancer detection. The Federal Communications Commission FCC allowed frequency bandwidth of 3.1 to 10.6 GHz for this purpose. ...