J. Pamp

Measurement results and modeling aspects for the UWB radio channel

We report on ultra-wideband (UWB) indoor channel measurements we have performed for several scenarios in an office building. Results are presented regarding the multipath decay supporting the applicability of the widely assumed exponential decay in a single cluster case, and show some results for a two-cluster situation caused by in-building back reflection. The frequency dependent decay of the channel gain with increasing frequencies is discussed in some detail regarding the competition between a power and a polynomial law. We present a power law for received power versus distance in a corridor environment and finally suggest some modifications allowing to adapt well known propagation model elements.

An ultra-wideband space-variant multipath indoor radio channel model

We present a generic ultra-wideband (UWB) multipath radio channel model that has been designed for link-level simulations and is suited for indoor environments, e.g. for WPAN applications. It covers the FCC frequency band [FCC, Feb. 2002] and is capable of producing space-variant impulse 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 model strong individual echoes. These echoes are important to obtain a realistic spatial (Doppler) behavior. The architecture of the model facilitates the application to UWB MIMO analyses. For a few scenarios (e.g., intra-office and inter-office transmission), site-specific parameter profiles are given that have been derived from measured data.

Wideband Car-to-Car Radio Channel Measurements and Model at 5.9 GHz

We present results of wideband (20 MHz) radio channel measurements at 5.9 GHz for the car-to-car channel in rural, highway, and Urban environments. Based on the measurements, corresponding path loss models for these environments are given. Power delay profiles are characterized using a simple model of a dominant path plus an exponential decay cluster, and statistics for these parameters are given. For all environments, Doppler spread statistics have been derived.

Ultra-wideband double vertical knife-edge model for obstruction of a ray by a person

We present a novel simple analytical model for the shadowing caused by a person that moves through an ultra-wideband ray. The model uses two vertical knife-edges plus phase and amplitude correction terms to determine the loss caused by the person at different perpendicular distances to the ray. In conjunction with the personpsilas trajectory the time-dependent shadowing loss can be determined, thus proving a building block for time-variant ultra-wideband channel models. The model is derived from channel measurements in the range from 4 to 10 GHz. On comparison with the measured data, we find that the proposed model provides good results in particular for low elevation angles between transmitter and receiver.

MEDIAN 60 GHz wideband indoor radio channel measurements and model

Radio channel measurements have been performed at 60 GHz carrier frequency with a bandwidth of 960 MHz in an indoor environment. We determine parameters for a multipath model based on the well-known statistical indoor channel model by Saleh et al., (1987). The model may be used to generate typical impulse responses for simulation purposes.

Locally Coherent Ultra-Wideband Radio Channel Model for Sensor Networks in Industrial Environment

We describe a new transfer function model for the static ultra-wideband (UWB) radio channel in industrial indoor environments for SPIN (sensor, positioning, and identification network) applications. The model addresses propagation between one or more transmitter and one or more receiver positions. It is locally coherent, i.e., it accounts for small scale displacements of transmitter and receiver. It is a geometry-based stochastic channel model which combines quasi-deterministic and purely stochastic components. The environment is represented by a set of scatterers which describe the interior structure of the building. Modelled quantities are the transfer functions pertaining to transmission between the transmitter and receiver positions, the corresponding set of paths, including directions of arrival at the receiver, individual path gains and delays. Parameters derived from 3-11 GHz measurements in an industry-type hall are given

Comparison of two generations of textile MIMO antennas at IHF

A wearable textile antenna is a field of big interest and is getting more market [2]. Despite the simple idea and structure of such technology, some chapters are still open for further research, e.g. substrates, feeding, washing ability... etc. In this paper a comparison of two dual-polarized wearable textile antenna generations is introduced. Other than simulation and experimental results comparison, materials and production technology used will be also discussed, showing the advantages and disadvantages of these technologies. Both antennas have been developed to operate in the industrial, scientific and medical (ISM i.e. 2.4 GHz - 2.5 GHz) band [1]. The experimental and simulation results will be shown and compared to those achieved with an old version of this antenna.