Patents by Inventor Hendrik van Bokhorst
Hendrik van Bokhorst 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).
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Patent number: 7421038Abstract: In one embodiment, a method of transmitting data from a transmitter in a wireless local area network (WLAN), where the transmitter has a timer and a modem. The transmitter periodically transmits a transmission signal that includes a timestamp field that includes a timestamp for synchronizing a receiver timer in a receiver of the WLAN. The timestamp, which represents a value within the count sequence of the transmitter timer, accounts for delays in the modem.Type: GrantFiled: March 23, 2007Date of Patent: September 2, 2008Assignee: Agere Systems Inc.Inventors: Wilhelmus J. M. Diepstraten, Hendrik van Bokhorst, Hans van Driest
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Publication number: 20080037467Abstract: A wireless local area network apparatus includes a transmitter and a receiver in which operation of the receiver is accurately synchronized with periodic signals from the transmitter. The periodic signals contain timing data indicating the state of a timer in the transmitter at the time the signal containing that data was transmitted and this timing data is retrieved from the signal when received by the receiver and loaded in a timer for controlling operation of the receiver.Type: ApplicationFiled: July 11, 2007Publication date: February 14, 2008Applicant: AGERE SYSTEMS INC.Inventors: Wilhelmus Diepstraten, Hendrik van Bokhorst, Hans van Driest
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Patent number: 7289578Abstract: A wireless local area network apparatus includes a transmitter and a receiver in which operation of the receiver is accurately synchronized with periodic signals from the transmitter. The periodic signals contain timing data indicating the state of a timer in the transmitter at the time the signal containing that data was transmitted and this timing data is retrieved from the signal when received by the receiver and loaded in a timer for controlling operation of the receiver.Type: GrantFiled: January 13, 2006Date of Patent: October 30, 2007Assignee: Agere Systems Inc.Inventors: Wilhelmus J. M. Diepstraten, Hendrik van Bokhorst, Hans van Driest
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Patent number: 7010058Abstract: A wireless local area network apparatus includes a transmitter and a receiver in which operation of the receiver is accurately synchronized with periodic signals from the transmitter. The periodic signals contain timing data indicating the state of a timer in the transmitter at the time the signal containing that data was transmitted and this timing data is retrieved from the signal when received by the receiver and loaded in a timer for controlling operation of the receiver.Type: GrantFiled: October 9, 2003Date of Patent: March 7, 2006Assignee: Agere Systems Inc.Inventors: Wilhelmus J. M. Diepstraten, Hendrik van Bokhorst, Hans van Driest
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Publication number: 20040071246Abstract: A wireless local area network apparatus includes a transmitter and a receiver in which operation of the receiver is accurately synchronized with periodic signals from the transmitter. The periodic signals contain timing data indicating the state of a timer in the transmitter at the time the signal containing that data was transmitted and this timing data is retrieved from the signal when received by the receiver and loaded in a timer for controlling operation of the receiver.Type: ApplicationFiled: October 9, 2003Publication date: April 15, 2004Inventors: Wilhelmus J. M. Diepstraten, Hendrik van Bokhorst, Hans van Driest
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Patent number: 6707867Abstract: A wireless local area network apparatus includes a transmitter and a receiver in which operation of the receiver is accurately synchronized with periodic signals from the transmitter. The periodic signals contain timing data indicating the state of a timer in the transmitter at the time the signal containing that data was transmitted and this timing data is retrieved from the signal when received by the receiver and loaded in a timer for controlling operation of the receiver.Type: GrantFiled: March 7, 2002Date of Patent: March 16, 2004Assignee: Agere Systems, Inc.Inventors: Wilhelmus J. M. Diepstraten, Hendrik van Bokhorst, Hans van Driest
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Publication number: 20020131484Abstract: A wireless local area network apparatus includes a transmitter and a receiver in which operation of the receiver is accurately synchronized with periodic signals from the transmitter. The periodic signals contain timing data indicating the state of a timer in the transmitter at the time the signal containing that data was transmitted and this timing data is retrieved from the signal when received by the receiver and loaded in a timer for controlling operation of the receiver.Type: ApplicationFiled: March 7, 2002Publication date: September 19, 2002Inventors: Wilhelmus J. M. Diepstraten, Hendrik van Bokhorst, Hans van Driest
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Patent number: 6192230Abstract: A wireless data communication system is operable in a power saving mode wherein stations are synchronized to be in an awake state to receive synchronizing messages (TIM, PSYNC) and traffic indicator information and are changed to a doze state if they are not to receive data messages. In one embodiment all stations (20) communicate via a base station access point (16), which broadcasts synchronizing messages (TIM) at regular intervals identifying stations (20) that are to receive data messages. In another embodiment all stations (220) communicate directly with one another, one station assumes the role of a master station and broadcasts synchronizing messages (PSYNC), and stations (220) desiring to transmit data messages transmit traffic indicator messages (PTIM) to the appropriate destination stations (220), in a synchronized awake period just before the next synchronizing message (PSYNC) is expected to arrive.Type: GrantFiled: September 27, 1993Date of Patent: February 20, 2001Assignee: Lucent Technologies, Inc.Inventors: Hendrik van Bokhorst, Albertus M. G. Claessen, Wilhelmus J. M. Diepstraten, Johannes P. N. Haagh, Hendrik Moelard, Leo Monteban, Rienk Mud
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Patent number: 5987033Abstract: 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: GrantFiled: September 8, 1997Date of Patent: November 16, 1999Assignee: Lucent Technologies, Inc.Inventors: Jan Boer, Hendrik van Bokhorst, Wilhelmus Josephus Diepstraten, Adriaan Kamerman, Rienk Mud, Hans van Driest, Robert John Kopmeiners
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Patent number: 5706428Abstract: 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: GrantFiled: March 14, 1996Date of Patent: January 6, 1998Assignee: Lucent Technologies Inc.Inventors: Jan Boer, Wilhelmus Josephus Diepstraten, Adriaan Kamerman, Hendrik van Bokhorst, Hans van Driest
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Patent number: 5422887Abstract: A station which broadcasts a frame of information over a wireless local area network, waits a predetermined time calculated to allow other stations to gain access to the network, and thereafter broadcasts another frame of information. A method is provided which improves access fairness while reducing the collision probability, thereby increasing data throughput in the network.Type: GrantFiled: June 9, 1994Date of Patent: June 6, 1995Assignee: NCR CorporationInventors: Wilhelmus J. M. Diepstraten, Hendrik van Bokhorst
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Patent number: 5369639Abstract: A local area network station (12) includes a transceiver (20) adapted to transmit and receive signals over a wireless communications link. The transceiver (20) is coupled to a CSMA/CD LAN controller device (22) and to a signal generator circuit (40) which is also coupled to the LAN controller device (22). If the station (12) desires to transmit a data frame but a carrier sense signal (CRS) indicates that the link is busy, transmission of the data frame is deferred, and after the carrier sense signal (CRS) becomes inactive, a collision is simulated by the signal generator circuit (40) providing a CDT signal to the LAN controller device (22) which goes into a backoff mode and attempts to retransmit the frame after a random backoff time. Thus, commercially available CSMA/CD chips can be utilized in a single wireless channel LAN environment using a CSMA/CA protocol, with a low risk of collisions.Type: GrantFiled: December 24, 1990Date of Patent: November 29, 1994Assignee: NCR CorporationInventors: Adriaan Kamerman, Hendrik van Bokhorst
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Patent number: 5329531Abstract: A method of accessing a communication medium allows for isochronous and asynchronous communication traffic to share the same medium and the same transceivers of a plurality of communication stations that communicate by way of a base station. The base station controls the communication between communication stations and generates regular timing periods in which isochronous traffic is sent to the stations with a higher priority than any asynchronous traffic pending at the beginning of each timing period. Once the initial isochronous traffic has accessed the medium, any further isochronous traffic retains access to the medium so that the asynchronous traffic can only occur in that part of the frame period remaining after the isochronous traffic has accessed the medium.Type: GrantFiled: June 18, 1993Date of Patent: July 12, 1994Assignee: NCR CorporationInventors: Wilhelmus J. M. Diepstraten, Hendrik van Bokhorst
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Patent number: 5049766Abstract: In a delay measuring circuit (10), an input clock signal (13) is applied to a multitapped delay line (14), the output taps of which are connected to a switch (26) which selects one of the switch inputs for connection to a phase comparator (34) which compares the input clock signal (13), delayed in a delay device (38) to compensate for the delay inherent in the switch (26), with the output of the switch (26). The input clock signal is also applied to a counter (22), and when the phase comparator (34) detects a phase match, the counter value is stored in a latch (32), the counter (22) is reset to a predetermined value, and the counting procedure resumed. The latch (32) thus always stores a value dependent on the delay of an individual delay cell (16-l to 16-N). This stored value can be applied to various uses, such as in a timing watchdog circuit or for generating accurate delays.Type: GrantFiled: March 15, 1990Date of Patent: September 17, 1991Assignee: NCR CorporationInventors: Hans van Driest, Hendrik van Bokhorst, Richard Kruithof
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Patent number: 5003562Abstract: A digital phase lock loop decoder for use in decoding Manchester encoded data operates at an internal clock speed having a speed equal to the data rate of the encoded data. The decoder includes a first sampling circuit for providing signals based on the clock speed of the encoded data, a delay circuit for generating delayed clock signals relative to the clock speed of the encoded data, a second sampling circuit for sampling the encoded data based on the delayed clock signals, a feedback circuit for generating clock signals whose phase corresponds with the phase of the delayed clock signals and a storage for outputting decoded data signals corresponding to the encoded data utilizing the delayed clock signals.Type: GrantFiled: March 14, 1990Date of Patent: March 26, 1991Assignee: NCR CorporationInventors: Hans van Driest, Hendrik van Bokhorst, Richard Kruithof
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Patent number: 4610010Abstract: In a local area network having a plurality of stations coupled to a transmission line over which signals are being simultaneously transmitted and received and wherein each station includes a station controller, a transmitter, a receiver and an adaptive hybrid circuit coupled to the transmission line and between the transmitter and the receiver for adaptively cancelling crosstalk from the transmitter to the receiver, a control circuit in each station for controlling the operation of the adaptive hybrid circuit in the station. In a first embodiment of the invention the control circuit includes a first circuit responsive to a request-to-send signal from the station controller for generating a first signal to enable a signal to be transmitted by the transmitter, and a second circuit responsive to the first signal for enabling the adaptive hybrid circuit to adaptively cancel crosstalk from the transmitter to the receiver after a preselected period of time after the start of each transmission.Type: GrantFiled: December 10, 1984Date of Patent: September 2, 1986Assignee: NCR CorporationInventors: Albertus M. G. Claessen, Hendrik van Bokhorst
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Patent number: RE40032Abstract: A wireless data communication system is operable in a power saving mode wherein stations are synchronized to be in an awake state to receive synchronizing messages (TIM, PSYNC) and traffic indicator information and are changed to a doze state if they are not to receive data messages. In one embodiment all stations (20) communicate via a base station access point (16), which broadcasts synchronizing messages (TIM) at regular intervals identifying stations (20) that are to receive data messages. In another embodiment all stations (220) communicate directly with one another, one station assumes the role of a master station and broadcasts synchronizing messages (PSYNC), and stations (220) desiring to transmit data messages transmit traffic indicator messages (PTIM) to the appropriate destination stations (220), in a synchronized awake period just before the next synchronizing message (PSYNC) is expected to arrive.Type: GrantFiled: February 19, 2003Date of Patent: January 22, 2008Assignee: Agere Systems Inc.Inventors: Hendrik van Bokhorst, Albertus M. G. Claessen, Wilhelmus J. M. Diepstraten, Johannes P. N. Haagh, Hendrik Moelard, Leo Monteban, Rienk Mud