Improved solutions for tomorrow's networks
The EC-funded project OBANET, studied specific coverage area management strategies and technologies in an effort to optimise performance in broadband adaptive wireless access networks. Optical beamforming architectures, based on the Butler matrices, were developed to address the complexity issue of multibeam architectures and to provide a flexible solution to network status changes. The newly developed optical-based architecture employs a photonic beamformer as opposed to the traditionally used DSP and RF/IF-based components. The clear advantage associated with this innovation is the capability to generate and steer N-beams independently, a factor of particular importance in the implementation of SDMA networks. Furthermore, the novel architecture allows for independent and concurrent control of all beams. This feature adds to the flexibility of the beamforming network, an initial step in addressing advanced network performance issues. The new optical beamforming network is based on arrayed-waveguide grating (AWG) and depressive media, thus decreasing the number of required optical components and adding further flexibility to the system. The optoelectronic approach is expected to overcome coverage area problems and performance impairment due to man-made and natural causes. The overall aim is to minimize service unavailability attributed to wireless link malfunction. The OBANET project has succeeded in developing novel beamformed-based solutions for adaptive antennas able to address performance and complexity issues in broadband multimedia environments. This technology could signal an important development towards overcoming wireless link unavailability problems, currently impeding performance.
