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Absfrucf-We present a generic ultra-wideband (LWB) of a room is such that echoes caused by certain paths may multipath radio channel model that has been designed for he appreciably distinguishable from each other. This aplink-level simulations and is suited for indoor environments, plies dee.g. for WPAN aPP1ications. It lays. For example, in LOS conditions, the direct path may responses (IR) and transfer functions. The model is of a hybrid type and combines a statistical approach to model dense multipath and a simple quasi-deterministic method to these echoes. model strong individual echoes. These echoes are important with increasing the Probability for Paths to obtain a realistic spatial (Doppler) behavior. The archi-increases because the corresponding Path distances get tecture of the model facilitates the application to U W B longer, which in turn increases the probability of interac-MIMO analyses. For a few scenarios (e.g.. intra-omce and tions with the environment. Consequently, the onset of inter-office transmission), site-specific parameter profiles the inevitable dense multipath regime is shifted towards are given that have been derived from measured data.larger delays. For medium to large excess delays, the average power delay profile (APDP) fits quite well into the exponential decay scheme that has been observed for A distinguishing feature of the UWB indoor radio wideband channels (cf. e. g. [3]). For small excess delays, channel is that certain individual paths are recognizable however, UWB APDP's tend to have a more spiky apand resolvable in the measurements. In contrast to dense pearance caused by individual echoes. Yet the first path multipath contributions, these paths exist individually corresponding to LOS conditions may be followed by over distances larger than a wavelength. In this document some trailing multipath contributions caused e.g. by the we give a self-contained specification of a multipath ra-mechanical antenna support. Depending on the environdio channel model that has been designed to incorporate ment and Tx-Rx distance, the direct path, floor, ceiling this property, i.e., the delay and amplitude changes of and wall reflections may be recognizable. individual echoes corresponding to different positions of An example for a LOS UWB channel AE'DP illustratthe transmitter or receiver are accounted for to produce a ing these points is given in Fig. 1. Fig. 2 shows 150 adjadecent Doppler behavior. cent color-coded power delay profiles for the same chan-The model is based on measurement data (cf.[ 2 ] ) that ne1 obtained by displacing one antenna over a linear diswere obtained in office environments with line-of-sight, tance of 150 cm. The individual echoes and the dependnon-line-of-sight, and intermediate conditions, and a dis-ence of the corresponding delays from the spatial positance between transmitter (Tx) and receiver (Rx) below tion (including a slight curvature of the LOS trace due to 10 m for a frequency range from 1 to 11 GHz.an appreciable change of the Tx-Rx distance over the ...

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