Transmitting signals for time of arrival estimation

Pulse or digital communications – Spread spectrum

Reexamination Certificate

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C455S067110, C455S067130

Reexamination Certificate

active

07822098

ABSTRACT:
A method generates a radio signal to be used for ranging. For each of one of multiple frames to be transmitted as a ranging symbol, a first time interval and a second time interval are allocated. The ranging symbol is then transmitted as a set of pulses in each of the frames only during the first time interval, and the second time interval has a length to reduces inter-frame interference.

REFERENCES:
patent: 7340009 (2008-03-01), Giannakis et al.
patent: 7620369 (2009-11-01), Molisch et al.
patent: 2005/0123024 (2005-06-01), Santhoff et al.

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