Patents Represented by Attorney Brian R. Short
  • Patent number: 7450552
    Abstract: Methods of access point control of client roaming are disclosed. The methods can include the access point periodically transmitting requests to a client, the access point monitoring reception of response to the requests, and the access point transmitting at least one disassociation frame if a response is not received by the access point from the client. An embodiment includes the disassociation frame being suppressed if the access point receives an association response from another access point that is intended for the client. Another embodiment includes the access point transmitting a disassociation frame if a response is received from the client, and a signal quality parameter of the response is below a threshold.
    Type: Grant
    Filed: July 2, 2004
    Date of Patent: November 11, 2008
    Assignee: Tropos Networks, Inc.
    Inventor: Cyrus Behroozi
  • Patent number: 7440412
    Abstract: A method and apparatus of predicting link quality of a link is disclosed. The method includes receiving multi-carrier modulated signals over a period of time, estimating an SNR for each received sub-carrier, constructing a sequence of the SNRs, and estimating link PER based upon knowledge of encoding and/or interleaving used during transmission, and the sequence of SNRs.
    Type: Grant
    Filed: March 13, 2006
    Date of Patent: October 21, 2008
    Assignee: Tzero Technologies, Inc.
    Inventors: Dengwei Fu, Sujai Chari, Mohan Ramasudha Karnam
  • Patent number: 7437139
    Abstract: A method and apparatus of calibrating filtering of receive and transmit signals is disclosed. The method of calibrating filtering of a received signal includes injecting an LO signal. The injected LO signal is filtered by a tunable filter. The filtered signal is frequency down-converted with an equivalent LO signal. The frequency down-converted signal is sampled while tuning the filtering. A desired filter tuning is determined based upon the samples and a frequency of the LO signal. The method of calibrating filtering of a transmit signal includes injecting an LO signal to a transmitter. The LO signal is filtered by a tunable filter. The filtered signal is frequency down-converted with an equivalent LO signal. The frequency down-converted signal is sampled while tuning the filter. A desired filter tuning is determined based upon the samples and a frequency of the LO signal.
    Type: Grant
    Filed: October 26, 2005
    Date of Patent: October 14, 2008
    Assignee: Tzero Technologies, Inc.
    Inventors: Steve Lo, Isaac Sever, Thai Nguyen, Ssu-Pin Ma
  • Patent number: 7430163
    Abstract: Embodiments of transmission data stream pre-processing are disclosed. A method includes receiving the data stream for transmission, forming blocks of samples from the data stream, inverse Fourier transforming the blocks of samples forming multi-carrier signal symbols, selecting sets of k multi-carrier signal symbols and time expanding each of the sets of the k multi-carrier signal symbols into sets of n multi-carrier signal symbols, where n is greater than k, and transmitting each of the n multi-carrier signal symbols. The time expansion can be accomplished by coding the coding the sets of k multi-carrier signal symbols.
    Type: Grant
    Filed: July 19, 2004
    Date of Patent: September 30, 2008
    Assignee: Tzero Technologies, Inc.
    Inventors: Sujai Chari, Rajeev Krishnomoorthy
  • Patent number: 7430458
    Abstract: A method of method of calculating an ET value for an irrigation area is disclosed. The method includes a weather parameter measurement system collecting at least one weather parameter of a weather parameter area, the at least one weather parameter of the weather parameter area providing a representation of weather outside of the irrigation area. An irrigation area weather parameter is calculated providing a representation of the weather within the irrigation area from the at least one weather parameter of the weather parameter area. The ET value for the irrigation area is calculated from an N-dimensional continuous function using the at least one irrigation area weather parameter, wherein the N-dimensions includes at least a 3-dimensional spatial cube.
    Type: Grant
    Filed: May 2, 2007
    Date of Patent: September 30, 2008
    Assignee: HydroPoint Data Systems, Inc.
    Inventors: Dan A. Dansereau, Peter Carlson
  • Patent number: 7417500
    Abstract: A method of controlling an adjustable gain of an amplifier is disclosed. The method includes setting an output of a replica amplifier to be equivalent to a precision reference with a control loop, summing an adjustable offset voltage into the control loop, adjusting the adjustable offset voltage until an error offset voltage of the control loop is nulled, and controlling the adjustable gain of the amplifier with an output of the control loop. An apparatus for controlling an adjustable gain of an amplifier is also disclosed. The apparatus includes a control loop for setting the adjustable gain. The control loop includes an adjustable gain replica amplifier. A switch receives an output of the replica amplifier and a precision reference. An error amplifier receives outputs from the switch and generates a control voltage. The control voltage controls an adjustable gain of the replica amplifier and the adjustable gain of the amplifier.
    Type: Grant
    Filed: June 19, 2006
    Date of Patent: August 26, 2008
    Assignee: Tzero Technologies, Inc.
    Inventor: James Christopher Arnott
  • Patent number: 7397789
    Abstract: A method and apparatus for generating connectivity is described. The method includes a server broadcasting a beacon including the server's address. The method further includes each client that receives the beacon rebroadcasting the beacon. The result is that each client receiving the beacon knows a way to reach the server.
    Type: Grant
    Filed: October 25, 2003
    Date of Patent: July 8, 2008
    Assignee: Tropos Networks, Inc.
    Inventors: Amalavoyal Narasimha Chari, Devabhaktuni Srikrishna
  • Patent number: 7382778
    Abstract: An embodiment includes a network of at least one router. The network includes a data packet address translator. The data packet address translator manipulates address information of data packets routed by the network, so that a network device connected to the network perceives the network to be a bridge. One embodiment of the network includes wireless mesh network that is wirelessly connectable to a client.
    Type: Grant
    Filed: January 5, 2004
    Date of Patent: June 3, 2008
    Assignee: Tropos Networks, Inc.
    Inventors: Amalavoyal Chari, Devabhaktuni Srikrishna
  • Patent number: 7376087
    Abstract: The invention includes an apparatus and method for displaying path metrics associate with nodes and links within a network. The method includes determining path metric values associated with the network. The method further includes displaying only the path metric values that fall within a predetermined set. The predetermined set can be adjustable by a network manager. The predetermined set can include an initial default value and be additionally adjusted by a network manager. The predetermined set associated with a particular node can be based upon a redundancy of paths available to the particular node.
    Type: Grant
    Filed: August 13, 2003
    Date of Patent: May 20, 2008
    Assignee: Tropos Networks, Inc.
    Inventor: Devabhaktuni Srikrishna
  • Patent number: 7366231
    Abstract: Embodiments of an Ethernet transceiver are disclosed. The Ethernet transceiver includes a plurality of digital signal streams, at least one digital signal stream being coupled to another of the digital signal streams. A domain transformer transforms sub-blocks of each of the plurality of the digital signal streams from an original domain into a lower complexity domain. A processor joint processes the transformed sub-blocks of the digital signal streams, each joint processed digital signal stream sub-block is influenced by other digital signal streams sub-blocks. An inverse transformer inverse transforms the joint processed signal streams sub-blocks back to the original domain.
    Type: Grant
    Filed: April 1, 2004
    Date of Patent: April 29, 2008
    Assignee: Teranetics, Inc.
    Inventors: Jose Tellado, Sanjay Kasturia, Eran Cohan
  • Patent number: 7362791
    Abstract: A method and apparatus of joint processing a plurality of digital signal streams is disclosed. The method includes transforming a plurality of the digital signal streams from an original domain to a lower complexity processing domain. The transformed plurality of digital signal streams are joint processed, wherein the joint processing includes multiplying samples of the plurality of transformed digital signal streams by a processing matrix. The joint processed signal streams are inverse transformed back to the original domain. Diagonal elements of the processing matrix are adaptively selected to cancel transmission echo signals of the plurality digital signal streams introduced during transmission of the plurality digital signal streams depending upon signal coupling of the plurality of digital signal streams.
    Type: Grant
    Filed: February 5, 2007
    Date of Patent: April 22, 2008
    Assignee: Teranetics, Inc.
    Inventors: Jose Tellado, Sanjay Kasturia, Eran Cohan
  • Patent number: 7362737
    Abstract: A wireless access node includes a first radio operable to transmit/receive on one of at least N transmission channels. A second radio is operable to transmit/receive on another one of the at least N transmission channels. A first filter bank, of less than N filters, filters a first transmit/receive signal of the first radio. A second filter bank, of less than N filters, filters a second transmit/receive signal of the second radio. Generally, N is greater than 2.
    Type: Grant
    Filed: April 8, 2004
    Date of Patent: April 22, 2008
    Assignee: Tropos Networks, Inc.
    Inventor: Cyrus Behroozi
  • Patent number: 7333448
    Abstract: The invention includes a full duplex transceiver for transmitting and receiving communication signals. The transceiver includes 1 to N sample and hold circuits. Each sample and hold circuit receives a first signal that includes a far-end signal, and in some cases an echo signal, and in some cases alternatively or additionally cross-talk signals. The transceiver additionally includes a plurality of subtraction circuits. Each subtraction circuit receives an output of at least one of the sample and hold circuits. Each subtraction circuit subtracts at least a fraction of a replica signal from at least a fraction of the output of the at least one of the sample and hold circuits. The subtraction circuits generate an output that represent the far-end signal with substantially reduced echo and/or cross-talk interference, and is available for additional receiver processing.
    Type: Grant
    Filed: November 3, 2003
    Date of Patent: February 19, 2008
    Assignee: Teranetics, Inc.
    Inventors: Sandeep Kumar Gupta, Sanjay Kasturia, Jose Tellado
  • Patent number: 7324794
    Abstract: Embodiments of methods of receiving transmitted signals are disclosed. The methods include a first antenna receiving a second signal, a second antenna receiving a second signal, adjusting a phase relationship between the first signal and the second signal, combining the phase adjusted first signal and second signal, and processing the phase adjusted first signal and second signal to determine the phase adjustment for optimizing at least one of signal to noise ratio and signal to interference ratio of the combined signals.
    Type: Grant
    Filed: September 29, 2004
    Date of Patent: January 29, 2008
    Assignee: Tzero Technologies, Inc.
    Inventors: Sujai Chari, Rajeev Krishnomoorthy
  • Patent number: 7248217
    Abstract: A method of controlling multiple antenna signal transmission is disclosed. The method includes adjusting signal parameters so that transmission signals from a plurality of antennas combine to form a directional beam. A time duration in which the transmission signals are directed is controlled so that an average EIRP does not exceed a predetermined threshold.
    Type: Grant
    Filed: August 31, 2005
    Date of Patent: July 24, 2007
    Assignee: Tzero Technologies, Inc.
    Inventors: Sanjay Mani, Adam L. Schwartz
  • Patent number: 7227883
    Abstract: A transceiver is disclosed. The transceiver includes a plurality of digital signal streams, wherein at least one digital signal stream is coupled to another of the digital signal streams. A transform block transforms a plurality of the digital signal streams from an original domain into a lower complexity processing domain. A processor joint processes the transformed digital signal streams, each joint processed digital signal stream being influenced by other digital signal streams. An inverse transform block inverse transforms the joint processed signal streams back to the original domain. A method of joint processing a plurality of digital signal streams is also disclosed. A first act of the method includes transforming a plurality of the digital signal streams from an original domain into a lower complexity processing domain.
    Type: Grant
    Filed: October 28, 2003
    Date of Patent: June 5, 2007
    Assignee: Teranetics, Inc.
    Inventors: Jose Tellado, Sanjay Kasturia, Eran Cohan
  • Patent number: 7132965
    Abstract: A high-speed sampling system and an analog to digital converter are disclosed. One embodiment of a method of sampling a signal includes receiving an analog signal and generating first samples at a rate of Fs, and generating second sub-samples from the first samples at a rate of Fs/N and having a relative phase of approximately (360/N)*(i?1) degrees, where i varies from 1 to N. In a first embodiment, at most two second sub-samplers are tracking the output of the first sampler at any point in time. In a second embodiment, only one of the N second sub-samplers are tracking the output of the first sampler at any point in time. A third embodiment further includes generating third samples from the second samples at a rate of Fs/N, and having a relative phase of approximately ((360/N)*(i?1)+180) degrees. A method of interleaved analog to digital converting includes corresponding time interleaved ADCs receiving the third samples.
    Type: Grant
    Filed: November 21, 2005
    Date of Patent: November 7, 2006
    Assignee: Teranetics, Inc.
    Inventors: Sandeep Kumar Gupta, Oleksly Zabroda
  • Patent number: 7075471
    Abstract: An apparatus and method for high-speed analog to digital conversion are disclosed. An ADC system includes a plurality of N/2 sub-ADCs, each sub-ADC receiving an analog signal and a clock signal and generating two digital samples at a rate of Fs/N. The two digital samples are generated with approximately 180 degree phase relationship relative to a frequency of Fs/N. The plurality of N/2 sub-ADCs of the time-interleaved ADC system, generate combined output samples at a rate of Fs. An ADC method includes a plurality of N/2 sub-ADCs receiving the analog signal, clocking each sub-ADC at a rate of FS/N. Each sub-ADC generates two digital samples at a rate of FS/(2N), the two digital samples being generated with approximately 180 degree phase relationship relative to a frequency of Fs/N. Outputs of the sub-ADCs are combined to generate digital samples at a rate of Fs.
    Type: Grant
    Filed: February 11, 2005
    Date of Patent: July 11, 2006
    Assignee: Teranetics, Inc.
    Inventor: Sandeep Kumar Gupta
  • Patent number: 7058021
    Abstract: The invention includes an apparatus and method for determining an optimal route based upon path quality of routes to an access node of a wireless mesh network. The method includes receiving routing packets at the access node through at least one wireless route. Each routing packet includes route information that identifies the wireless route of the routing packet. A success ratio of a number of successfully received routing packets versus a number of transmitted routing packets is determined over a period of time T1, for each wireless route. The wireless route having a greatest success ratio is first selected, as are other wireless routes that have success ratios within a predetermined amount of the greatest success ratio.
    Type: Grant
    Filed: January 27, 2005
    Date of Patent: June 6, 2006
    Assignee: Tropos Networks, Inc.
    Inventors: Devabhaktuni Srikrishna, Amalavoyal Chari
  • Patent number: 7015842
    Abstract: A high-speed sampling system and an analog to digital converter are disclosed. One embodiment of a method of sampling a signal includes receiving an analog signal and generating first samples at a rate of Fs, and generating second sub-samples from the first samples at a rate of Fs/N and having a relative phase of approximately (360/N)*(i?1) degrees, where i varies from 1 to N. In a first embodiment, at most two second sub-samplers are tracking the output of the first sampler at any point in time. In a second embodiment, only one of the N second sub-samplers are tracking the output of the first sampler at any point in time. A third embodiment further includes generating third samples from the second samples at a rate of Fs/N, and having a relative phase of approximately ((360/N)*(i?1)+180) degrees. A method of interleaved analog to digital converting includes corresponding time interleaved ADCs receiving the third samples.
    Type: Grant
    Filed: January 12, 2005
    Date of Patent: March 21, 2006
    Assignee: Teranetics, Inc.
    Inventors: Sandeep Kumar Gupta, Oleksiy Zabroda