Analysis of Realistic Ultrawideband Indoor Communication Channels by Using an Efficient Ray-Tracing Based Method

Abstract

A fundamental step in ultrawideband (UWB) communication system design involves the characterization of the indoor propagation channel. In this paper, we show that the UWB propagation channel parameters can be accurately predicted by employing ray tracing (RT) simulation carried out at various frequencies over the signal bandwidth. It is important to note that the determination of the rays reaching a given location is made only once, as the RT algorithm is independent of frequency. A parallel ray approximation (PRA) is used to significantly improve the computational efficiency of the RT based method. Moreover the accuracy of the approximation is verified through a measurement campaign

An efficient indoor ray-tracing propagation model with a quasi-3D approach

“…This is not an issue, since narrowband analysis have been traditionally used to coverage prediction. Nevertheless, ray-tracing method can be easily used to broadband channels evaluation [15] when necessary.…”

Calibration of indoor UWB sub-band divided ray tracing using multiobjective simulated annealing

“…Then the corresponding calculation for other subbands can be derived directly according to the physical properties of the propagation mechanisms. It is worth mentioning that distinguishing how the dielectric properties vary with frequencies is very difficult, so that it is assumed that the dielectric properties ε r and σ do not depend on the frequency within the entire UWB bandwidth [4], [13]. With the complex electric field η {·} (f c,i ) of the propagation path at the center frequency f c,i of the i−th subband is obtained, the resulting complex electric field η {·} (f c,i ′ ) at all other center frequency f c,i ′ can be calculated [7].…”

On the use of ray tracing for performance prediction of UWB indoor localization systems

“…Second, together with electric properties of the building materials, the floor plan can be used for ray tracing (RT) simulations. With RT, realistic channel impulse responses can be obtained [5]. Some RT tools can also provide diffuse multipath (DM) contributions, which model the non-coherent part of the channel.…”

“…In references like [5], power delay profiles (PDPs) over some geometric areas are used. The large density of specular paths and the averaging process cause PDPs that nicely fit to measured ones.…”