公开(公告)号：CZ9802040A3

公开(公告)日：1998-10-14

申请号：CZ204098

申请日：1996-01-03

Applicant: IBM

Inventor： DE LANGE MARTIN ,  GFELLER FRITZ RUDOLF ,  HIRT WALTER

IPC: H04B10/114 ,  H04L1/00 ,  H04L7/04 ,  H04L12/28 ,  H04B10/10

CPC classification number: H04L7/042 ,  H04B10/1141 ,  H04B10/1149 ,  H04L1/0003 ,  H04L1/0025 ,  H04L7/046 ,  Y02D50/10

Abstract: The communication system includes a robust physical layer header (RPLH) which can be understood by all participating stations. This robust header (50) at least comprises a preamble (52) consisting of frames forming a periodic sequence of pulses, the number of slots per frame and the frame content being known to all participating stations. The preamble serves for relative synchronization and carrier detection of the receiving stations. The robust header further comprises a unique synchronization word (53) which is used for absolute synchronization of the receiving stations. This synchronization word is followed by a control field (59) of fixed length and known structure. The control field informs the receiving stations of which modulation method will be used for the transmission of data. Pref. the control field also includes data for communication link and network control.

公开(公告)号：GB2314487B

公开(公告)日：2001-01-10

申请号：GB9712244

申请日：1997-06-13

Applicant: IBM

Inventor： GFELLER FRITZ RUDOLF ,  HORTENSIUS PETER DIRK ,  KAM PATRICK K ,  KERMANI PARVIZ ,  MCKAY DANNY M ,  NAGHSHINEH MAHMOUD ,  OLSEN CLAUS MICHAEL ,  REZVANI BABAK

IPC: H04L1/00 ,  H04L1/08 ,  H04L12/413

Abstract: In a wireless multi-rate communications system, a method for extending the range of communications in the system by dividing the physical layer frame into two portions: a robust header portion and a body, where the repetition rate of the data symbols in the header portion is greater than or equal to the repetition rate of the data symbols in the body of the frame. In this way the header can be received and decoded by all stations in the system with a high probability, while the body of the frame need only be received and decoded by the destination station to which the body of the frame is intended to be received and decoded.

公开(公告)号：AT239332T

公开(公告)日：2003-05-15

申请号：AT96900002

申请日：1996-01-03

Applicant: IBM

Inventor： DE LANGE MARTIN ,  GFELLER FRITZ RUDOLF ,  HIRT WALTER

IPC: H04B10/114 ,  H04L1/00 ,  H04L7/04 ,  H04L12/28 ,  H04B10/10

Abstract: The communication system includes a robust physical layer header (RPLH) which can be understood by all participating stations. This robust header (50) at least comprises a preamble (52) consisting of frames forming a periodic sequence of pulses, the number of slots per frame and the frame content being known to all participating stations. The preamble serves for relative synchronization and carrier detection of the receiving stations. The robust header further comprises a unique synchronization word (53) which is used for absolute synchronization of the receiving stations. This synchronization word is followed by a control field (59) of fixed length and known structure. The control field informs the receiving stations of which modulation method will be used for the transmission of data. Pref. the control field also includes data for communication link and network control.

公开(公告)号：CZ204098A3

公开(公告)日：1998-10-14

申请号：CZ204098

申请日：1996-01-03

Applicant: IBM

Inventor： DE LANGE MARTIN ,  GFELLER FRITZ RUDOLF ,  HIRT WALTER

IPC: H04B10/114 ,  H04L1/00 ,  H04L7/04 ,  H04L12/28 ,  H04B10/10

Abstract: The communication system includes a robust physical layer header (RPLH) which can be understood by all participating stations. This robust header (50) at least comprises a preamble (52) consisting of frames forming a periodic sequence of pulses, the number of slots per frame and the frame content being known to all participating stations. The preamble serves for relative synchronization and carrier detection of the receiving stations. The robust header further comprises a unique synchronization word (53) which is used for absolute synchronization of the receiving stations. This synchronization word is followed by a control field (59) of fixed length and known structure. The control field informs the receiving stations of which modulation method will be used for the transmission of data. Pref. the control field also includes data for communication link and network control.

公开(公告)号：DE3787427T2

公开(公告)日：1994-04-28

申请号：DE3787427

申请日：1987-07-14

Applicant: IBM

Inventor： FRANKE HILMAR ,  GFELLER FRITZ RUDOLF

IPC: G02B6/00 ,  G01J1/02 ,  G01J1/58 ,  G02B6/42 ,  H04B10/04 ,  H04B10/06 ,  H04B10/10 ,  H04B10/14 ,  H04B10/158 ,  H04B10/26 ,  H04B10/43 ,  G01J5/28 ,  H04B10/00

Abstract: A fluorescent activated light detector for detection of time modulated IR signals of preselected wavelength includes an IR light collecting member (12) made of a solid transparent core material (13) with a fluorescent light absorbing dye (15) molecularly dispersed throughout the core. Photodiodes (14) are operatively associated with the collecting member for detecting fluorescent light emitted by the collecting member upon exposure to incident IR radiation of the preselected wavelength. The light collecting member has a surface area A1 much greater than an active area A2 of the photosensing means. Use of this fluorescent activated light detector allows for increasing the effective transmission distance of infrared free space communication links without requiring an increase in transmitter radiated power.

公开(公告)号：ES2193232T3

公开(公告)日：2003-11-01

申请号：ES96900002

申请日：1996-01-03

Applicant: IBM

Inventor： DE LANGE MARTIN ,  GFELLER FRITZ RUDOLF ,  HIRT WALTER

IPC: H04B10/114 ,  H04L1/00 ,  H04L7/04 ,  H04L12/28 ,  H04B10/10

Abstract: The communication system includes a robust physical layer header (RPLH) which can be understood by all participating stations. This robust header (50) at least comprises a preamble (52) consisting of frames forming a periodic sequence of pulses, the number of slots per frame and the frame content being known to all participating stations. The preamble serves for relative synchronization and carrier detection of the receiving stations. The robust header further comprises a unique synchronization word (53) which is used for absolute synchronization of the receiving stations. This synchronization word is followed by a control field (59) of fixed length and known structure. The control field informs the receiving stations of which modulation method will be used for the transmission of data. Pref. the control field also includes data for communication link and network control.

公开(公告)号：HK1016369A1

公开(公告)日：1999-10-29

申请号：HK99101354

申请日：1999-04-07

Applicant: IBM

Inventor： LANGE MARTIN DE ,  GFELLER FRITZ RUDOLF ,  HIRT WALTER

IPC: H04B10/114 ,  H04L20060101 ,  H04L1/00 ,  H04L7/04 ,  H04L12/28

Abstract: The communication system includes a robust physical layer header (RPLH) which can be understood by all participating stations. This robust header (50) at least comprises a preamble (52) consisting of frames forming a periodic sequence of pulses, the number of slots per frame and the frame content being known to all participating stations. The preamble serves for relative synchronization and carrier detection of the receiving stations. The robust header further comprises a unique synchronization word (53) which is used for absolute synchronization of the receiving stations. This synchronization word is followed by a control field (59) of fixed length and known structure. The control field informs the receiving stations of which modulation method will be used for the transmission of data. Pref. the control field also includes data for communication link and network control.

公开(公告)号：PL327574A1

公开(公告)日：1998-12-21

申请号：PL32757496

申请日：1996-01-03

Applicant: IBM

Inventor： DE LANGE MARTIN ,  GFELLER FRITZ RUDOLF ,  HIRT WALTER

IPC: H04B10/114 ,  H04L1/00 ,  H04L7/04 ,  H04L12/28 ,  H04B10/10

Abstract: The communication system includes a robust physical layer header (RPLH) which can be understood by all participating stations. This robust header (50) at least comprises a preamble (52) consisting of frames forming a periodic sequence of pulses, the number of slots per frame and the frame content being known to all participating stations. The preamble serves for relative synchronization and carrier detection of the receiving stations. The robust header further comprises a unique synchronization word (53) which is used for absolute synchronization of the receiving stations. This synchronization word is followed by a control field (59) of fixed length and known structure. The control field informs the receiving stations of which modulation method will be used for the transmission of data. Pref. the control field also includes data for communication link and network control.

公开(公告)号：MY120295A

公开(公告)日：2005-10-31

申请号：MYPI9605415

申请日：1996-12-20

Applicant: IBM

Inventor： LANGE MARTIN DE ,  GFELLER FRITZ RUDOLF ,  HIRT WALTER

IPC: H04B7/00

Abstract: DISCLOSED IS AN OPTICAL COMMUNICATION SYSTEM ENABLING COMMUNICATION BETWEEN SEVERAL CO-EXISTING TRANSMITTING AND RECEIVING STATIONS. IN ORDER TO ALLOW COMMUNICATION BETWEEN THE CO-EXISTING STATIONS, A ROBUST PHYSICAL LAYER HEADER (RPLH; 50) IS EMPLOYED WHICH CAN BE UNDERSTOOD BY ALL PARTICIPATING STATIONS. THIS ROBUST HEADER (50) AT LEAST COMPRISES A PREAMBLE (52) CONSISTING OF FRAMES FORMING A PERIODIC SEQUENCE OF PULSES, THE NUMBER OF SLOTS PER FRAME AND THE FRAME CONTENT BEING KNOWN TO ALL PARTICIPATING STATIONS. THE PREAMBLE (52) SERVES FOR RELATIVE SYNCHRONIZATION AND CARRIER DETECTION OF THE RECEIVING STATIONS. THE ROBUST HEADER (50) FURTHER COMPRISES A UNIQUE SYNCHRONIZATION WORD (53) USED FOR ABSOLUTE SYNCHRONIZATION OF THE RECEIVING STATIONS. THIS SYNCHRONIZATION WORD (53) IS FOLLOWED BY A CONTROL FIELD (59) OF FIXED LENGTH AND KNOWN STRUCTURE. BY MEANS OF THIS CONTROL FIELD (59) THE RECEIVING STATIONS ARE INFORMED WHICH MODULATION METHOD WILL BE USED FOR THE TRANSMISSION OF DATA. UNDER CERTAIN CIRCUMSTANCES IT IS ALSO USEFUL TO PROVIDE OTHER CONTROL INFORMATION IN SAID CONTROL FIELD (59) FOR COMMUNICATION LINK AND NETWORK CONTROL. FURTHERMORE, INFORMATION MAY BE EXCHANGED TO ALLOW NEGOTIATION AND/OR ADAPTATION OF THE DATA RATE USED FOR TRANSMISSION. THIS ALLOWS TO OPTIMIZE THE THROUGHPUT DEPENDING ON THE CONDITIONS (QUALITY) ON THE CHANNEL.

公开(公告)号：CA2241937C

公开(公告)日：2004-04-27

申请号：CA2241937

申请日：1996-01-03

Applicant: IBM

Inventor： HIRT WALTER ,  DE LANGE MARTIN ,  GFELLER FRITZ RUDOLF

IPC: H04B10/114 ,  H04L1/00 ,  H04L7/04 ,  H04L12/28 ,  H04B10/04 ,  H04B10/06 ,  H04B10/10

Abstract: Disclosed is an optical communication system enabling communication between several co-existing transmitting and receiving stations. In order to allow communication between the co-existing stations, a robust physical layer header (RPLH; 50) is employed which can be understood by all participating stations. This robust header (50) at least comprises a preamble (52) consisting of frames forming a periodic sequence of pulses, the number of slots per frame and the frame content bein g known to all participating stations. The preamble (52) serves for relative synchronization and carrier detection of the receiving stations . The robust header (50) further comprises a unique synchronization word (53) used for absolute synchronization of the receiving stations. This synchronization word (53) is followed by a control field (59) of fixed length and known structure. By means of this control field (59) the receiving stations are informed which modulation method will be used for the transmission of data. Under certain circumstances it is also useful to provide other control information in said control field (59) for communication link and network control. Furthermore, information ma y be exchanged to allow negotiation and/or adaptation of the data rate used for transmission. This allows to optimize the throughput depending on the conditions (quality) on the channel.