A highly collision-resistive RFID system multiplexes communications between thousands of tags and a single reader in combination with time-domain multiplexing code division multiple access (TDCDMA), CRC error detection, and re-transmission for error recovery. The collision probability due to a random selection of CDMA codes and TDMA channels bounds the number of IDs successfully transmitted to ...

Dedication To My Parents For their love, sacrifice, encouragement, and patience and Ajji Whose memories shall always be with me iv Acknowledgments My advisor, Prof. Tom Little, has constantly inspired me to set high goals for myself and helped me attain them. Ever since I became a member of the Multimedia Communications Laboratory, Tom has enthusiastically guided my research and was patient as ...

Due to the emergence of Internet Things, need for effective identification and traceability has increased. Radio-frequency (RFID), a simple cheap approach gathering information, therefore drawn attention research communities. However, this system suffers from problems caused by high density, such as collisions duplication. Thus, deployment RFID is more in dense environment where it may improve ...

The Electronic Braille Document Reader project was to evaluate the feasibility of a device which could read Latin text and convert it to Braille pattern which could be read through a single Braille cell. A device which mimics the advantages of an e-book reader but suited to the needs of the blind.

This paper is organized in three almost self contained sections. The first section is a popular discussion on the number of crosswords based on a remark of Shannon made in [Shannon, 1948]. Although never published, the ’back-of-the-envelope’ calculation we present is believed to be the same argument Shannon had in mind when he wrote the passage on crosswords. The second section presents the Hau...

Speeder Reader is an interactive reading station built around two primary ideas: dynamic text (especially RSVP, that is, rapid serial visual presentation), and the interface metaphor of driving. As words flash one at a time on a screen in front of the reader, he or she controls the rate of speed of the words with a gas pedal (up to 1850 words per minute in the current instance). Text stream sel...

Sensor collision (interference) is studied in a large network of low bit-rate sensors that communicate via backscatter, i.e. modulate the reflection of a common carrier transmitted by a central reader. Closed-form analysis is provided, quantifying sensor collision (interference) in high-density, backscatter sensor networks (BSN), as a function of number of tags and aggregate bandwidth. Analysis...

With the emergence of active tags and RFID technology used in the fast-moving objects, readers need urgently to read and write tags in limited time. Anticollision algorithms resolve the problem of a number of tags at the same time to communicate with the reader. Traditional anti-collision algorithm is to minimize recognition time and improve search efficiency under the conditions of maintaining...