公开(公告)号：CA2322685C

公开(公告)日：2004-10-26

申请号：CA2322685

申请日：1999-04-21

Applicant: IBM

Inventor： GFELLER FRITZ ,  HIRT WALTER ,  INGHAM BRIAN RICHARD

IPC: H04B10/11 ,  H04L25/02 ,  H04B10/10

Abstract: The present invention provides an apparatus and a method for improved connectivity in wireless optical networks. Therefore at least two or more receiving units are used which receive an infrared signal and convert it to a digital signal. The digital signals represent data in the form of frames whereby each frame comprises at least a data field and a header field containing a preamble. A selector determines a measure related to the signal-to-noise ratio of the preamble and compares the measures in order to select the best suited signal for further processing.

公开(公告)号：CA2322685A1

公开(公告)日：2000-07-20

申请号：CA2322685

申请日：1999-04-21

Applicant: IBM

Inventor： HIRT WALTER ,  GFELLER FRITZ ,  INGHAM BRIAN RICHARD

IPC: H04B10/11 ,  H04L25/02 ,  H04B10/10

Abstract: The present invention provides an apparatus and a method for improved connectivity in wireless optical networks. Therefore at least two or more receiving units are used which receive an infrared signal and convert it to a digital signal. The digital signals represent data in the form of frames whereby each frame comprises at least a data field and a header field containing a preamble. A selector determines a measure related to the signalto-noise ratio of the preamble and compares the measures in order to select the best suited signal for further processing.

公开(公告)号：CA2166255A1

公开(公告)日：1997-06-29

申请号：CA2166255

申请日：1995-12-28

Applicant: IBM CANADA

Inventor： TAGLIONE JOHN V ,  INGHAM BRIAN RICHARD

IPC: H04B10/40 ,  H04L12/413 ,  H04B10/28

Abstract: A data transceiver employing optical radiation comprises transmitter assembly with an optical emitter operable in a first band and an optical emitter in a second band and a receiver assembly with a wide band optical detector which can receive signals transmitted via both the first and second band. In a second embodiment, the receiver includes both a wide band optical detector and a second optical detector which is operable in only one of the first and second bands, the receiver subtracting signals received at the second optical detector from those received at the wide band detector to separate signals received via the first and second bands. In a preferred aspect, the optical radiation employed is infrared radiation and the first and second bands are near and medium infrared bands.