US Patent 7317876 Medium access control for retro-reflectors

Patent 7317876 was granted and assigned to Bbn Technologies on January, 2008 by the United States Patent and Trademark Office.

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Brig Barnum Elliott0

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Patent abstract

A method, a device and a system for communications to and from a retro-reflector device (302) is provided. The retro-reflector device (302) receives a first frame (400) encoded in an input beam (106). The retro-reflector device (302) creates and sends a second frame (420) in a first reflected beam (108) formed by the retro-reflector device (302) reflecting the input beam (106) along a path closely aligned with a path of the input beam. At least one of the first frame (400) and the second frame (420) includes medium access control information. In some implementations, the first frame (400) may include a data throughput rate (404, 406), a preamble (402) and an error correction code (412).

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