Patents by Inventor Wilhelmus Josephus Diepstraten

Wilhelmus Josephus Diepstraten has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5987033
    Abstract: A receiver, and a method for operating the receiver, for a station in a wireless local area network using a common wireless communication channel and employing a CSMA/CA (carrier sense multiple access with collision avoidance) protocol includes various modes. In normal mode, the receiver follows typical states in order to detect a message and demodulate data from the message properly. Meanwhile, a process implements a message-in-message (MIM) mode when an energy increase above a specified level is detected. While in the MIM mode, if a carrier is detected, the energy increase is caused by a new message; otherwise, the energy increase is caused by an interfering station. If the carrier is detected, the receiver begins retraining so that it can start receiving the new message as soon as the first message ends. If no carrier is detected, the receiver waits a specified time to detect a carrier or for the end of the first message, after which the receiver returns to the beginning of the normal mode.
    Type: Grant
    Filed: September 8, 1997
    Date of Patent: November 16, 1999
    Assignee: Lucent Technologies, Inc.
    Inventors: Jan Boer, Hendrik van Bokhorst, Wilhelmus Josephus Diepstraten, Adriaan Kamerman, Rienk Mud, Hans van Driest, Robert John Kopmeiners
  • Patent number: 5706428
    Abstract: A wireless LAN includes first stations adapted to operate at a 1 or a 2 Mbps data rate and second stations adapted to operate at a 1,2,5 or 8 Mbps data rate. The 1 and 2 Mbps rates use DBPSK and DQPSK modulation, respectively. The 5 and 8 Mbps rates use PPM/DQPSK modulation. All four data rates use direct sequence spread spectrum (DSSS) coding. All transmitted messages start with a preamble and header at the 1 Mbps rate. The header includes fields identifying the data rate for the data portion of the message, and a length field. For a 2 Mbps transmission the length field identifies the number of bytes in the data field. For a 5 or 8 Mbps the length field identifies the number of bytes in the data field which, if transmitted at 2 Mbps, would take the same transmission time of the data field, and is thus a fraction 2/5 or 2/8 of the actual number of the bytes. With this arrangements, all the stations are interoperable in a co-existent manner in the LAN.
    Type: Grant
    Filed: March 14, 1996
    Date of Patent: January 6, 1998
    Assignee: Lucent Technologies Inc.
    Inventors: Jan Boer, Wilhelmus Josephus Diepstraten, Adriaan Kamerman, Hendrik van Bokhorst, Hans van Driest