公开(公告)号：PL342885A1

公开(公告)日：2001-07-16

申请号：PL34288599

申请日：1999-04-21

Applicant: IBM

Inventor： GFELLER FRITZ ,  HIRT WALTER ,  INGHAM BRIAN R

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：DE69426839D1

公开(公告)日：2001-04-12

申请号：DE69426839

申请日：1994-09-03

Applicant: IBM

Inventor： GFELLER FRITZ ,  RICHARD HEINZ ,  WEISS BEAT

IPC: H04B10/10

公开(公告)号：DE69425447D1

公开(公告)日：2000-09-07

申请号：DE69425447

申请日：1994-09-03

Applicant: IBM

Inventor： GFELLER FRITZ ,  RICHARD HEINZ ,  WEISS BEAT

IPC: H01L33/00 ,  G02B5/02 ,  G08C19/36 ,  H04B10/114 ,  H04B10/40 ,  H04B10/10

Abstract: The optical transmission module has an array of infra-red LEDs (51) arranged in a regular, and preferably symmetrical manner in the cavity formed by a dome-shaped housing (52). The housing has a diffuser for apparent source enlargement. The LEDs are either individually or commonly addressable. Pref., the LEDs of the array (11) are located on a mounting base (10) such that the main radiation axis of the diodes is approx parallel to the centre axis of the housing. Infra-red light is emitted from the array through the housing (52). There is a substrate for circuitry underneath the diodes. A transceiver for wireless data communication and for use in connection with the module is also claimed, which incorporates a receiver consisting of photodiodes.

公开(公告)号：DE69411954T2

公开(公告)日：1999-03-25

申请号：DE69411954

申请日：1994-04-18

Applicant: IBM

Inventor： GFELLER FRITZ

IPC: G06F3/00 ,  C09K3/00 ,  G06F13/00 ,  H04B10/114 ,  H04B10/10

Abstract: PCT No. PCT/EP94/01196 Sec. 371 Date Sep. 3, 1996 Sec. 102(e) Date Sep. 3, 1996 PCT Filed Apr. 18, 1994 PCT Pub. No. WO95/28777 PCT Pub. Date Oct. 26, 1995The wireless optical (in particular infrared) communication system with at least one transmitter (75) and one receiver (76) comprises control means (77, 78), which dynamically adapt the data rate and/or the optical power of the transmitter in dependence of signal-to-noise ratio of the receiver. Due to this adjustment, optimized system performance is maintained even under the influence of ambient light which statistically changes the signal-to-noise ratio of the receiver. The best compromise between data rate, bit error rate and transmission range is dynamically determined. The control function is distributed between transmitting and receiving system unit. The control information is communicated via wireless optical communication.

公开(公告)号：HUT76951A

公开(公告)日：1998-01-28

申请号：HU9700412

申请日：1994-09-03

Applicant: IBM

Inventor： GFELLER FRITZ ,  RICHARD HEINZ ,  WEISS BEAT

IPC: H01L33/00 ,  G02B5/02 ,  G08C19/36 ,  H04B10/114 ,  H04B10/40 ,  H04B10/10

Abstract: The optical transmission module has an array of infra-red LEDs (51) arranged in a regular, and preferably symmetrical manner in the cavity formed by a dome-shaped housing (52). The housing has a diffuser for apparent source enlargement. The LEDs are either individually or commonly addressable. Pref., the LEDs of the array (11) are located on a mounting base (10) such that the main radiation axis of the diodes is approx parallel to the centre axis of the housing. Infra-red light is emitted from the array through the housing (52). There is a substrate for circuitry underneath the diodes. A transceiver for wireless data communication and for use in connection with the module is also claimed, which incorporates a receiver consisting of photodiodes.

公开(公告)号：PL320018A1

公开(公告)日：1997-09-01

申请号：PL32001894

申请日：1994-09-03

Applicant: IBM DEUTSCHLAND INFORMATIONSSY

Inventor： GFELLER FRITZ ,  RICHARD HEINZ ,  WEISS BEAT

IPC: H01L33/00 ,  G02B5/02 ,  G08C19/36 ,  H04B10/114 ,  H04B10/40 ,  H04B10/10

Abstract: The optical transmission module has an array of infra-red LEDs (51) arranged in a regular, and preferably symmetrical manner in the cavity formed by a dome-shaped housing (52). The housing has a diffuser for apparent source enlargement. The LEDs are either individually or commonly addressable. Pref., the LEDs of the array (11) are located on a mounting base (10) such that the main radiation axis of the diodes is approx parallel to the centre axis of the housing. Infra-red light is emitted from the array through the housing (52). There is a substrate for circuitry underneath the diodes. A transceiver for wireless data communication and for use in connection with the module is also claimed, which incorporates a receiver consisting of photodiodes.