A 10-GHz discrete cylindrical lens array with multiple beams is designed and characterized as a receiving angle-diversity array for wireless communications in a multipath environment. The array also has dual-orthogonal polarization and therefore built-in polarization diversity. The array is designed for wide-angle scanning between 45 and 45 and measured scanning patterns are presented. The polarization isolation between the two channels is about 30 dB at boresite and about 10 dB for a 30 scan angle. The addition of the lens array at the very front end of a link shows significant reduction of multipath fading peak-to-null ratio.
Biography Andy Davis is a Director of the global consulting engineering practice 'Hyder Consulting', and serves on the Hyder global professional board. They are headquartered in London UK, and manage about 3,000 staff in 20 offices around the world, including over 900 staff in the Persian Gulf. He is the Chief Engineer of the Hyder high-rise design 'Studio' which is now based in Dubai and is responsible for many of the high-rise projects undertaken by Hyder around the world, including the beautiful Emirates Towers in Dubai, which are the tallest buildings in the Gulf. Andy's 'Studio' currently has 7 towers between 60 levels and 160 levels under various stages of design and construction for Clients in the Gulf and around the globe. Andy is responsible for the structural design certification of the 160 level Burj Dubai Tower, currently u/c in Dubai, UAE. When completed in 2008, it will be the tallest manmade construction in the world. He is an Australian Engineer by training and passion, but also holds a PhD in Engineering and an Adjunct Chair in Architecture at the University of Sydney, and serves on several International Code Committees. He received the RW Chapman medal and Engineering Excellence Award from the Institution of Engineers for his work, and was recently cited as amongst the 100 most influential Australian Engineers.
This paper presents an X band smart antenna array in which adaptive processing of the received signals is performed by dynamic holographic optical circuitry. The optical circuitry adaptively extracts the principal component of the received signal space, that is the strongest first-order independent temporal component of the ensemble of received signals. The adaptive receiver system can be used, for example, to mitigate multipath interference effects and can separate one received signal from another even though their power spectra may entirely overlap. A prototype two-channel system is designed to fit in a standard-size briefcase and consume less than 50 W of power. The input to the system are modulated waves with a carrier in X band and the output is an electronic demodulated signal. Three major components of this system are described in detail: 1) the quasi-optical lens antenna array front end with angle-of-arrival preprocessing and downconversion, 2) the two-channel electrooptic modulation and optical carrier suppression stage, and 3) the smart optical processor (auto-tuning filter). Component and end-to-end system measurements give quantitative indicators for the usefulness of optical processing in wireless communications.
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