The performance degradation in traditional adaptive beamformers can be attributed to the imprecise knowledge of the array steering vector and inaccurate estimation of the covariance matrix. The inaccurate estimation of the covariance matrix is due to the limited data samples and presence of desired signal components in the training data. The mismatch between the actual and presumed steering vec...

This paper investigates uplink pattern optimisation algorithms with and without power control for a smart antenna system operating in an infrastructure Wireless Local Area Network (WLAN) following IEEE802.11a or HIPERLAN/2 standards. An indoor infrastructure WLAN scenario with multiple users communicating with an access point is modelled using a deterministic ray-tracing tool. The WLAN access p...

In this paper, we propose an adaptive non-intrusive cognitive radio network based on smart antenna technologies. The cognitive transmitter (CT), which is equipped with antenna array, first estimates and tracks the composite steering vectors of each primary (licensed) user. In what follows, CT forms transmit beamforming to place nulls to primary receivers (PR) based on the estimated spatial sign...

One area of active interest in the GNSS community is determining the vulnerability of multi-antenna signal processing algorithms given calibration errors in antennas and analog front-end hardware. Errors introduced by the antennas or by the analog hardware that are not completely mitigated by software or calibration may lead to degradation in steering-vector accuracy. Of interest are the charac...

The ight control system of migratory locusts is able to adapt its steering behaviour to varying conditions in its motor system or in the animals' immediate environment. A connectionist simulation model based on a Kohonen network extended by multi-dimensional output signals was employed to reproduce the adaptive control performances. For the output signals of the network a trial and error learni...

EyeSim is a multi-robot, multi-tasking simulation system that allows realistic simulation of mobile robots with either differential drive, Ackermann steering, or omni-directional Mechanum wheel drive. The software development kit (SDK) for EyeSim is identical to the RoBIOS operating system for the real EyeBot robots, including a virtual camera system. A realistic error model for sensors and act...

Robust Adaptive Beam forming algorithms face many insidious issues such as array steering vector errors which can significantly alter the array gain expected through beam forming. Other issues include coherent signal and interferers, problems like small sample size broadband interferences and so on. Therefore, there is a need to explore and investigate such beam forming methods that solve such ...

A robust Capon beamformer (RCB) against the uncertainty of nominal array steering vector (ASV) is formulated in this paper. The RCB, which can be categorized as diagonal loading approach, is obtained by maximizing the output power of the standard Capon beamformer (SCB) subject to an uncertainty constraint on the nominal ASV. The bound of its output signal-to-interference-plusnoise ratio (SINR) ...

In this paper, the effects of roll center height of McPherson suspension mechanism on dynamic behaviour of a vehicle are first studied, and then the optimum location of roll center of this suspension system is determined for a conceptual Class A vehicle. ADAMS/Car software was used for the analysis of vehicle dynamic behaviour in different positions of suspension roll center. Next, optimization...