Artur Nalobin

Detection of programme making and special event devices in indoor channels

This contribution deals with the detection of programme making and special event applications by spectrum sensing. In particular the effect of site specific positioning of spectrum sensors is discussed and is of interest especially to cognitive systems. The procedure of energy detection of the devices is based on a stochastic fading channel performed by ray tracing analysis within an exhibition hall of Berlin. The results of spectrum sensing show a high dependence on the distance and on the number of sensors.

Narrow-band indoor localization in cognitive radio networks using compressed sensing

This contribution deals with narrow-band target localization in cognitive radio networks. In particular the localization is of interest to narrow-band programme making and special event applications in indoor scenarios. The procedure to find the location is based on a compressed sensing approach, which allows the solution of underdetermined systems of linear equations. The algorithm uses the received signal strength, which was derived by ray tracing techniques applied to a 3D model of the fairground of Berlin. The accuracy of the proposed procedure is analytically studied through simulations.

Utilization of the array factor for narrowband direction of arrival estimation

This contribution deals with the direction of arrival estimation of narrowband signals using an antenna array. Under sparsity constraints the estimation procedure is based on compressed sensing by altering the array factor of the antenna. This approach allows to influence directly the incoherence requirement of the sensing matrix. Simulation results are provided to present the performance of the proposed method.

Development and analysis of a modified Saleh-Valenzuela channel model for the UHF band

This contribution deals with the analysis of a modified Saleh-Valenzuela channel model for the UHF band. The development of the channel model is based on indoor channel measurements within a large exhibition hall in a line-of-sight scenario in order to study new cognitive radio systems. Contrary to the conventional modeling, the path voltage gain is modeled by a Rayleigh probability density function. Due to the broad-band consideration the channel model can be used for a variety of different operating frequencies.

A system simulator including channel and frontend models for cognitive professional wireless microphones

In this paper a simulation environment for indoor transmissions in the ultra high frequency band is presented. The simulator comprises hardware as well as channel models that were derived from extensive measurement campaigns. In case of hardware modeling, nonlinear memory-polynomial models are used in order to accurately describe the intermodulation between multiple receive signals. The presented channel model is structured into three layers for indoor line of sight, non line of sight as well as outdoor to indoor transmissions. The indoor models utilize a Saleh-Valenzuela approach and a Clarkes model, while the outdoor model makes use of a Hata model.