Wireless communications systems with self threshold setting

Details Wireless communications systems with self threshold setting Wireless communications systems with self threshold setting

1997-12-24

2000-03-07

Chan, Jason

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

250214R, 250214C, 359189, 359194, H01J 4014, H04B 1006

Patent

active

06034802&

ABSTRACT:
This invention provides a solution to the problem of determining how long the peak value detected for the first pulse be kept, and when should it be updated. In infrared communication, the communication distance may vary over time during the transmission. For instance in a mobile infrared telephone the users generally are moving with respect to each other. The signal amplitude changes within a very large range over time and the receiver expected to operate in this environment must also handle a large number of different communication protocols. It uses the instant signal as a basis for adjusting the threshold. The present invention is capable of accepting a wide input dynamic range of signals up to and beyond five orders of magnitude (50 dB). This is accomplished while overcoming the difficulties presented by many communications protocols, by providing a technique in which the output pulse width of an amplified photo detector input is not strongly dependent upon the input signal amplitude.

REFERENCES:
patent: 4431916 (1984-02-01), Couch

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