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The main contribution of this paper is the design of a hardware sorter. This sorter is configured as a balanced, fixed binary tree of node units; the configuration of the sorter is independent of the length of data to be sorted. Each node unit can be realized on a single LSI chip. The logic of the hardware sorter design is heavily influenced by a specific, compressed, representation of sorted data. Using this hardware sorter and a few auxiliary functions based on the sorted property, we demonstrate the design of a relational data base machine.

There is currently much interest in the development of Optic Wireless and Visible Light Communication (VLC) systems in the ITS field. Research in VLC and boomerang systems in particular often remain at a theoretical or computer-simulated level. This paper reports the 3-stage development of a boomerang prototype communication and ranging system using visible light V2V communication via LEDs and photodiodes, with direct-sequence spread spectrum techniques. The system uses simple and widely available components aiming for a low-cost frugal innovation approach. Results show that while we have to improve the prototype distance measurement unit due to a margin of error, simultaneous communication and ranging is possible with our newly designed prototype. The benefits of further research and development of boomerang technology prototypes are confirmed.

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