This paper derives equations that describe level-crossing rates and average fade durations for mobile receivers operating in spatially complicated multipath channels. The results are useful for describing fading statistics for wireless systems that operate in realistic propagation channels or employ smart antennas, adaptive arrays, or other technologies that lead to a non-omnidirectional distri...

(ABSTRACT) The increasing demand for high data rate services necessitates the adoption of very wideband waveforms. In this case, the channel is frequency-selective, that is, a large number of resolvable multipaths are present in this environment and fading is not highly correlated across the band. Orthogonal frequency division multiplexing (OFDM) is well-known to be effective against multipath ...

This contribution considers adaptive (multiple input multiple output) MIMO-diversity selection at the receiver jointly with closed-loop power control (PC) to efficiently combat fading with only few transmit (Tx) and receive (Rx) antennas. Hence we avoid resalting to antenna selection among large MIMO-arrays without PC which would be otherwise required to keep complexity low. With low Doppler cl...

We present the modelling of (self-)adaptive systems with the OSSS+R library, which is based on SystemC. Additionally, an FPGA-based reconfigurable demonstrator shows first syn-

Reconfigurable computing has grown to become an important and large field of research. It is based on using Field Programmable Gate Arrays (FPGAs). In this paper, this technology is introduced and it is shown how it can be applied for adaptive system design. There is a large range of real-world applications for such systems, including network infrastructure.

Reconfigurable hardware devices are envisioned as the proper platform to implement multimedia applications, providing both real time performance and dynamic adaptability for the application. In this paper, we discuss the issues involved in using reconfigurable hardware devices for multimedia applications. The ideas and approach are then applied to a collaborative object tracking system that has...

In this paper we introduce a new adaptive array beamformer able to work well even when the desired signal and the interference are coherent. The present adaptive beamformers fail to operate in these cases. The results of simulations support the theoretical predictions.

— when the array steering vector is known then in adaptive beam forming we can have resolution and interference rejection capability. In this paper we propose a variety of approaches like SMILSMI,Kalman based LMS and Kalman based RLS for adaptive beamforming through simulation result various adaptive beamforming algorithm can be analysed.

A general framework for adaptive and non-adaptive spacetime beampattern synthesis using quadratic beampattern constraints with minimum mean-square error (MMSE) and linearly constrained minimum variance (LCMV) beamforming is presented. Main beam and sidelobe pattern control is achieved by imposing a set of inequality constraints on the weighted mean-square error between the adaptive pattern and ...