Ultra wide bandwidth (UWB) signals are commonly defined as signals that have a large relative bandwidth (bandwidth divided by the carrier frequency) or a large absolute bandwidth. Typical indoor environments contain multiple walls and obstacles consisting of different materials. The RF ultra wideband (UWB) system is a promising technology for indoor localisation owing to its high bandwidth that...

We study the performance of an innovative communication scheme for ultra-wideband systems which are based on impulse radio in two different short-range communication scenarios: the proposed system relies on both the introduction of the cyclic prefix at the transmitter and the use of a frequency domain detector at the receiver. Two different detection strategies based either on the zero forcing ...

Visible light communications (VLC) that use the infrastructure of the indoor illumination system have been envisioned as a compact, safe, and green alternative to WiFi for the downlink of an indoor wireless mobile communication system. Although the optical spectrum is typically well-suited to high throughput applications, combining communications with indoor lighting in a commercially viable sy...

MIMO vector radio channel sounding devices allow multidimensional analysis of wave propagation in mobile radio channels. 6-dimensions represent Doppler, TDOA, 2-D DOD and 2-D DOA. Antenna array architectures, calibration and K-D unitary ESPRIT parameter estimation are discussed. Parametric channel models can be derived from the estimated data.

In this paper a radio propagation simulation tool is used to estimate the power distribution and channel time dispersion throughout the cell in typical MBS scenarios and the measurements performed during the SAMBA field trials campaign are used to validate the results. Moreover, it is shown how good the simulated match the measured results in complex propagation scenarios. Also in this paper, e...

Introduction This paper will discuss many of the theoretical and physical principles that underlie the operation of radar systems. The word radar is derived from an acronym for radio detection and ranging. Radar is an electronic and electromagnetic system that uses radio waves to detect and locate objects. Radar operates by transmitting a particular kind of radio frequency waveform and detectin...

A test bed for wireless multimedia networks is established in Broadband Communications Laboratory. The test bed is based on wireless LAN technology. Real-time applications, such as video conferencing, and Internet access have been experimented on the test bed. The observations and technical issues are presented and discussed. A survey of current indoor radio propagation models is introduced. Th...

Welcome to this Special Issue in which we explore recent thinking and developments concerned with the optical wireless communication systems and networks. The demand for access to higher data rate in wireless access network, wireless multimedia applications and wireless video is growing. There are mainly two technologies, radio and optical, capable of offering these services. Radio has the adva...

Radio wave propagation simulations based on the ray-optical approximation have been widely adopted in coverage analysis for a range of situations, including outdoor-to-indoor scenario. This work presents O2I ray-tracing utilizing laser-scanned point cloud building interior. The simulated radio channels are compared to their measured counterparts at 4 and 14 GHz terms path loss, delay angular sp...