公开(公告)号：AT362683T

公开(公告)日：2007-06-15

申请号：AT04798923

申请日：2004-11-19

Applicant: IBM

Inventor： FURRER SIMEON ,  JELITTO JENS ,  SCHOTT WOLFGANG ,  WEISS BEAT

IPC: H04L27/26 ,  G06F17/14

Abstract: The invention relates to a method for modulating sub-carrier symbols to an intermediate-frequency OFDM signal having even and odd samples, including following steps: transforming a number N of the sub-carrier symbols to pre-processed sub-carrier symbols; performing a complex inverse discrete Fourier transformation (IDFT) on the pre-processed sub-carrier symbols to generate complex output symbols; and transforming the complex output symbols to the intermediate-frequency OFDM signal, wherein the sub-carrier symbols are transformed so that the even and odd samples of the intermediate-frequency OFDM signal are given by real and imaginary parts of the complex output symbols.

公开(公告)号：CA2197916C

公开(公告)日：2002-12-10

申请号：CA2197916

申请日：1994-09-03

Applicant: IBM

Inventor： RICHARD HEINZ ,  GFELLER FRITZ ,  WEISS BEAT

IPC: H01L33/00 ,  G02B5/02 ,  G08C19/36 ,  H04B10/114 ,  H04B10/40 ,  H04B10/10 ,  G06F3/00

Abstract: Disclosed are optical transmitter and transceiver modules for data communication. Such a transceiver module comprises an array of light emitting diodes mounted on a mounting base being arranged in a regular and symmetrical manner in a dome-shaped housing. This housing comprises diffusor means for source enlargement, In addition to the transmitter part consisting of said diodes, the transceiver module comprises a receiver. The receiver has four photodiodes arranged below the mounting base. These photodiodes are tilted and face in different directions to receive light from all around the module. The photodiodes are protected b y a thin wire mesh which serves as Faraday cage to reduce electro magnetic interference. A substrate for electronic circuitry in SMD-Technology is situated underneath the photodiodes.

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：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.