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In this study, a wideband direct data domain genetic algorithm beamforming approach to adaptive processing using fast Fourier transform is presented. Received wideband signals are decomposed to a set of frequency narrow subbands using fast Fourier transform. Each subband could be treated separately after being transformed to a reference frequency using the steering vector transformation technique;...
Phased arrays are a form of steerable antenna whose architecture makes the system complex and generally expensive. Their versatility and performance motivates the development of alternative structures which allow us to obtain simplified designs as powerful as the original approach but significantly cheaper. In this paper, a novel technique which collects information only from one antenna during each...
Antenna array systems are important components of modern radar and wireless communication systems. By controlling the array through a real-time optimization process, the adaptive techniques diminish the impact of system component noise and mitigate the effects of interfering radiation to ensure the delivery of a maximum fidelity signal. This paper deals with the possibilities to cancel unwanted signals...
If the elements in an ultrasound array are damaged, the beamforming performance and imaging quality (contrast and resolution) will be significantly reduced due to the distorted beam pattern with for example, a significant increase of sidelobe level. Defective elements can be detected through either in-direct impedance measurement or direct monitoring of the acoustic output using fibre Bragg grating...
This paper proposes a genetic algorithm (GA) based beamformer to optimize speech recognition accuracy for a pretrained speech recognizer. The proposed beamformer is designed to tackle the non-differentiable and non-linear natures of speech recognition by employing the GA algorithm to search for the optimal beamformer weights. Specifically, a population of beamformer weights is reproduced by crossover...
The current antenna systems have limited capacity when it comes to the frequency usage. Smart antennas provide a smart solution to this problem by steering the beam power in the desired direction and pointing nulls in the undesired direction. Genetic Algorithm is an optimization algorithm which mimics the underlying phenomenon of evolution of natural species and genetic recombination. In this paper...
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