Patents by Inventor Derek Gerlach

Derek Gerlach 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).

  • Publication number: 20160324564
    Abstract: Technologies are generally described for devices for ablation of a target material. The device may be a medical device and may have a medical tool portion and an ablative device portion. The ablative device portion has at least two independently controllable firing chambers. A source of fluid is in fluid communication each firing chamber. Each of the firing chambers is configured to propel the fluid to ablate a target material according to a programmed pattern of ablative treatment for the target material. Methods of ablation and use of the disclosed device are also described.
    Type: Application
    Filed: December 27, 2013
    Publication date: November 10, 2016
    Applicant: EMPIRE TECHNOLOGY DEVELOPMENT LLC
    Inventors: Derek Gerlach, Leslie A. Field
  • Patent number: 7180952
    Abstract: Systems and methods for precisely controlling the amount of redundancy introduced by a turbo encoding process. Bits having predetermined values are introduced into the turbo encoding input stream and then deleted from the turbo encoding output stream. At the receiver end, the bits having predetermined values are reintroduced into the encoded information stream as having been received with a maximum confidence level. Coding rate may be varied by varying the number of bits having predetermined values which are inserted at the encoder input. This scheme permits the amount of redundancy to be varied according to system requirements.
    Type: Grant
    Filed: August 7, 2003
    Date of Patent: February 20, 2007
    Assignee: Cisco Technology, Inc.
    Inventors: Derek Gerlach, James M. Gardner, Vincent K. Jones, IV
  • Patent number: 7149238
    Abstract: A discrete multitone stacked-carrier spread spectrum communication method is based on frequency domain spreading including multiplication of a baseband signal by a set of superimposed, or stacked, complex sinusoid carrier waves. In a preferred embodiment, the spreading involves energizing the bins of a large Fast Fourier transform (FFT). This provides a considerable savings in computational complexity for moderate output FFT sizes. Point-to-multipoint and multipoint-to-multipoint (nodeless) network topologies are possible. A code-nulling method is included for interference cancellation and enhanced signal separation by exploiting the spectral diversity of the various sources. The basic method may be extended to include multielement antenna array nulling methods for interference cancellation and enhanced signal separation using spatial separation. Such methods permit directive and retrodirective transmission systems that adapt or can be adapted to the radio environment.
    Type: Grant
    Filed: April 21, 2006
    Date of Patent: December 12, 2006
    Assignee: Cingular Wireless II, LLC
    Inventors: Brian G. Agee, Matthew Bromberg, Derek Gerlach, David Gibbons, James Timothy Golden, Minnic Ho, Elliott Hoole, Mary Jesse, Robert Lee Maxwell, Robert G. Mechaley, Jr., Robert Ray Naish, David J. Nix, David James Ryan, David Stephenson
  • Patent number: 7106781
    Abstract: A discrete multitone stacked-carrier spread spectrum communication method is based on frequency domain spreading including multiplication of a baseband signal by a set of superimposed, or stacked, complex sinusoid carrier waves. In a preferred embodiment, the spreading involves energizing the bins of a large Fast Fourier transform (FFT). This provides a considerable savings in computational complexity for moderate output FFT sizes. Point-to-multipoint and multipoint-to-multipoint (nodeless) network topologies are possible. A code-nulling method is included for interference cancellation and enhanced signal separation by exploiting the spectral diversity of the various sources. The basic method may be extended to include multielement antenna array nulling methods for interference cancellation and enhanced signal separation using spatial separation. Such methods permit directive and retrodirective transmission systems that adapt or can be adapted to the radio environment.
    Type: Grant
    Filed: August 3, 2001
    Date of Patent: September 12, 2006
    Assignee: Cingular Wireless II, LLC
    Inventors: Brian G. Agee, Matthew Bromberg, Derek Gerlach, David Gibbons, James Timothy Golden, Minnie Ho, Elliott Hoole, Mary Jesse, Robert Lee Maxwell, Robert G. Mechaley, Jr., Robert Ray Naish, David J. Nix, David James Ryan, David Stephenson
  • Publication number: 20060193373
    Abstract: A discrete multitone stacked-carrier spread spectrum communication method is based on frequency domain spreading including multiplication of a baseband signal by a set of superimposed, or stacked, complex sinusoid carrier waves. In a preferred embodiment, the spreading involves energizing the bins of a large Fast Fourier transform (FFT). This provides a considerable savings in computational complexity for moderate output FFT sizes. Point-to-multipoint and multipoint-to-multipoint (nodeless) network topologies are possible. A code-nulling method is included for interference cancellation and enhanced signal separation by exploiting the spectral diversity of the various sources. The basic method may be extended to include multielement antenna array nulling methods for interference cancellation and enhanced signal separation using spatial separation. Such methods permit directive and retrodirective transmission systems that adapt or can be adapted to the radio environment.
    Type: Application
    Filed: April 21, 2006
    Publication date: August 31, 2006
    Inventors: Brian Agee, Matthew Bromberg, Derek Gerlach, David Gibbons, James Golden, Minnie Ho, Elliott Hoole, Mary Jesse, Robert Maxwell, Robert Mechaley, Robert Naish, David Nix, David Ryan, David Stephenson
  • Patent number: 7095791
    Abstract: Systems and methods for optimally combining signals from multiple antennas to ameliorate the effects of noise and/or interference on OFDM communications are provided. In one embodiment, an initial spatial statistical characterization of interference and/or noise is based on training symbols received via each antenna. Because the transmitted values of the training symbols are already known, there is no need to estimate their transmitted value to form this initial statistical characterization. The data symbol values received via the multiple antennas are combined based on the initial spatial statistical characterization. The result of this combination step is then used to form a refined spatial statistical characterization of noise and/or interference. The received data symbol values are then recombined based on the refined spatial statistical characterization.
    Type: Grant
    Filed: August 5, 2005
    Date of Patent: August 22, 2006
    Assignee: Cisco Technology, Inc.
    Inventors: Vincent K. Jones, IV, Derek Gerlach, Gregory Raleigh
  • Patent number: 7046967
    Abstract: Improved adjustment of transmission power in a communication system is provided. In one embodiment, in a point to multipoint communication system, transmission power of a subscriber unit is controlled based on power measurements made at a central access point. Power measurement information based on transmissions occurring at irregular intervals may be combined in a beneficial manner to control transmission output power. In one embodiment, a power regulation process determines a series of difference values indicating the differences between desired received power level at the central access point and measured received power level. A smoothing process is applied to the difference values. One or more parameters of the smoothing process vary with elapsed time since a last available power measurement.
    Type: Grant
    Filed: May 3, 2002
    Date of Patent: May 16, 2006
    Assignee: Cisco Technology, Inc.
    Inventors: Ali Raissinia, Vincent K. Jones, IV, Derek Gerlach, Gregory G. Raleigh, Michael Pollack
  • Publication number: 20050271155
    Abstract: Systems and methods for optimally combining signals from multiple antennas to ameliorate the effects of noise and/or interference on OFDM communications are provided. In one embodiment, an initial spatial statistical characterization of interference and/or noise is based on training symbols received via each antenna. Because the transmitted values of the training symbols are already known, there is no need to estimate their transmitted value to form this initial statistical characterization. The data symbol values received via the multiple antennas are combined based on the initial spatial statistical characterization. The result of this combination step is then used to form a refined spatial statistical characterization of noise and/or interference. The received data symbol values are then recombined based on the refined spatial statistical characterization.
    Type: Application
    Filed: August 5, 2005
    Publication date: December 8, 2005
    Inventors: Vincent Jones, Derek Gerlach, Gregory Raleigh
  • Patent number: 6973134
    Abstract: Systems and methods for optimally combining signals from multiple antennas to ameliorate the effects of noise and/or interference on OFDM communications are provided. In one embodiment, an initial spatial statistical characterization of interference and/or noise is based on training symbols received via each antenna. Because the transmitted values of the training symbols are already known, there is no need to estimate their transmitted value to form this initial statistical characterization. The data symbol values received via the multiple antennas are combined based on the initial spatial statistical characterization. The result of this combination step is then used to form a refined spatial statistical characterization of noise and/or interference. The received data symbol values are then recombined based on the refined spatial statistical characterization.
    Type: Grant
    Filed: May 4, 2000
    Date of Patent: December 6, 2005
    Assignee: Cisco Technology, Inc.
    Inventors: Vincent K. Jones IV, Derek Gerlach, Gregory Raleigh
  • Patent number: 6836519
    Abstract: Improved receiver automatic gain control for OFDM-based communication systems is provided, thus realizing the full potential of OFDM systems to handle rapid variation in channel characteristics. The improved automatic gain control technique can also accommodate reception of multiple OFDM signals having disparate power levels via the same analog receiver chain and analog to digital converter while minimizing the arithmetic precision necessary for optimal digital processing. By reducing the necessary arithmetic precision, the cost of implementing the receiver with integrated circuit technology is greatly reduced.
    Type: Grant
    Filed: December 20, 2000
    Date of Patent: December 28, 2004
    Assignee: Cisco Technology, Inc.
    Inventors: Derek Gerlach, James Gardner, Vincent K. Jones, IV
  • Patent number: 6757241
    Abstract: A spatial processor that exploits signals that arrive via multiple outputs of a communication channel to provide soft decision values useful to a trellis or Viterbi decoder. A spatial processor may take into account a statistical characterization of interference as received via the multiple channel outputs. Spatial processor operation may also be optimized to operate in conjunction with orthogonal frequency division multiplexing (OFDM).
    Type: Grant
    Filed: June 28, 2002
    Date of Patent: June 29, 2004
    Assignee: Cisco Technology, Inc.
    Inventors: Vincent K. Jones, Gregory G. Raleigh, Derek Gerlach
  • Patent number: 6725411
    Abstract: Systems and methods for augmenting the performance of iterative soft decision-in soft decision-out decoding of block codes with extrinsic information based on multiple parity equations inherent to the block codes. Cyclic shifting of codewords may be applied in the context of iterative soft decision-in soft decision-out decoding to maximize the usefulness of a parity equation corresponding to any particular codeword bit. Soft decisions are determined on a bit-by-bit basis in response to multi-bit symbol measurements. This allows the use of relatively inexpensive bit-based decoders for decoding of multi-bit symbols.
    Type: Grant
    Filed: October 2, 2002
    Date of Patent: April 20, 2004
    Assignee: Cisco Technology, Inc.
    Inventors: Derek Gerlach, Richard Koralek, Vincent K. Jones, Gregory G. Raleigh
  • Patent number: 6628697
    Abstract: A chirp waveform is employed in establishing timing synchronization between nodes of a data communication network. In one embodiment, the chirp waveform is combined with a waveform modulated with data to form a synchronization waveform. The receiver of the synchronization waveform determines an alignment of the chirp waveform to a template chirp waveform to synchronize timing between nodes.
    Type: Grant
    Filed: October 21, 1999
    Date of Patent: September 30, 2003
    Assignee: Cisco Technology, Inc.
    Inventors: Bretton Douglas, Derek Gerlach, Santosh Anikhindi, Vincent K. Jones, IV
  • Patent number: 6628723
    Abstract: Systems and methods for precisely controlling the amount of redundancy introduced by a turbo encoding process. Bits having predetermined values are introduced into the turbo encoding input stream and then deleted from the turbo encoding output stream. At the receiver end, the bits having predetermined values are reintroduced into the encoded information stream as having been received with a maximum confidence level. Coding rate may be varied by varying the number of bits having predetermined values which are inserted at the encoder input. This scheme permits the amount of redundancy to be varied according to system requirements.
    Type: Grant
    Filed: October 15, 1999
    Date of Patent: September 30, 2003
    Assignee: Cisco Technology
    Inventors: Derek Gerlach, James M. Gardner, Vincent K. Jones, IV
  • Patent number: 6621851
    Abstract: A discrete multitone stacked-carrier spread spectrum communication method is based on frequency domain spreading including multiplication of a baseband signal by a set of superimposed, or stacked, complex sinusoid carrier waves. In a preferred embodiment, the spreading involves energizing the bins of a large Fast Fourier transform (FFT). This provides a considerable savings in computational complexity for moderate output FFT sizes. Point-to-multipoint and multipoint-to-multipoint (nodeless) network topologies are possible. A code-nulling method is included for interference cancellation and enhanced signal separation by exploiting the spectral diversity of the various sources. The basic method may be extended to include multielement antenna array nulling methods for interference cancellation and enhanced signal separation using spatial separation. Such methods permit directive and retrodirective transmission systems that adapt or can be adapted to the radio environment.
    Type: Grant
    Filed: November 28, 2000
    Date of Patent: September 16, 2003
    Assignee: AT&T Wireless Services, Inc.
    Inventors: Brian G. Agee, Matthew Bromberg, Derek Gerlach, David Gibbons, James Timothy Golden, Minnie Ho, Elliott Hoole, Mary Jesse, Robert Lee Maxwell, Robert G. Mechaley, Jr., Robert Ray Naish, David J. Nix, David James Ryan, David Stephenson
  • Patent number: 6499128
    Abstract: Systems and methods for augmenting the performance of iterative soft decision-in soft decision-out decoding of block codes with extrinsic information based on multiple parity equations inherent to the block codes. Cyclic shifting of codewords may be applied in the context of iterative soft decision-in soft decision-out decoding to maximize the usefulness of a parity equation corresponding to any particular codeword bit. Soft decisions are determined on a bit-by-bit basis in response to multi-bit symbol measurements. This allows the use of relatively inexpensive bit-based decoders for decoding of multi-bit symbols.
    Type: Grant
    Filed: February 18, 1999
    Date of Patent: December 24, 2002
    Assignee: Cisco Technology, Inc.
    Inventors: Derek Gerlach, Richard Koralek, Vincent K. Jones, Gregory G. Raleigh
  • Publication number: 20020159404
    Abstract: Improved adjustment of transmission power in a communication system is provided. In one embodiment, in a point to multipoint communication system, transmission power of a subscriber unit is controlled based on power measurements made at a central access point. Power measurement information based on transmissions occurring at irregular intervals may be combined in a beneficial manner to control transmission output power. In one embodiment, a power regulation process determines a series of difference values indicating the differences between desired received power level at the central access point and measured received power level. A smoothing process is applied to the difference values. One or more parameters of the smoothing process vary with elapsed time since a last available power measurement.
    Type: Application
    Filed: May 3, 2002
    Publication date: October 31, 2002
    Applicant: Cisco Technology, Inc., A CALIFORNIA CORPORATION
    Inventors: Ali Raissinia, Vincent K. Jones, Derek Gerlach, Gregory G. Raleigh, Michael Pollack
  • Publication number: 20020122465
    Abstract: A discrete multitone stacked-carrier spread spectrum communication method is based on frequency domain spreading including multiplication of a baseband signal by a set of superimposed, or stacked, complex sinusoid carrier waves. In a preferred embodiment, the spreading involves energizing the bins of a large Fast Fourier transform (FFT). This provides a considerable savings in computational complexity for moderate output FFT sizes. Point-to-multipoint and multipoint-to-multipoint (nodeless) network topologies are possible. A code-nulling method is included for interference cancellation and enhanced signal separation by exploiting the spectral diversity of the various sources. The basic method may be extended to include multielement antenna array nulling methods for interference cancellation and enhanced signal separation using spatial separation. Such methods permit directive and retrodirective transmission systems that adapt or can be adapted to the radio environment.
    Type: Application
    Filed: August 3, 2001
    Publication date: September 5, 2002
    Inventors: Brian G. Agee, Matthew Bromberg, Derek Gerlach, David Gibbons, James Timothy Golden, Minnie Ho, Elliott Hoole, Mary Jesse, Robert Lee Maxwell, Robert G. Mechaley, Robert Ray Naish, David J. Nix, David James Ryan, David Stephenson
  • Patent number: 6442130
    Abstract: A spatial processor that exploits signals that arrive via multiple outputs of a communication channel to provide soft decision values useful to a trellis or Viterbi decoder. A spatial processor may take into account a statistical characterization of interference as received via the multiple channel outputs. Spatial processor operation may also be optimized to operate in conjunction with orthogonal frequency division multiplexing (OFDM).
    Type: Grant
    Filed: January 21, 1999
    Date of Patent: August 27, 2002
    Assignee: Cisco Technology, Inc.
    Inventors: Vincent K. Jones, IV, Gregory G. Raleigh, Derek Gerlach
  • Patent number: 6408165
    Abstract: Improved adjustment of transmission power in a communication system is provided. In one embodiment, in a point to multipoint communication system, transmission power of a subscriber unit is controlled based on power measurements made at a central access point. Power measurement information based on transmissions occurring at irregular intervals may be combined in a beneficial manner to control transmission output power. In one embodiment, a power regulation process determines a series of difference values indicating the differences between desired received power level at the central access point and measured received power level. A smoothing process is applied to the difference values. One or more parameters of the smoothing process vary with elapsed time since a last available power measurement.
    Type: Grant
    Filed: July 6, 1999
    Date of Patent: June 18, 2002
    Assignee: Cisco Technology, Inc.
    Inventors: Ali Raissinia, Vincent K. Jones, IV, Derek Gerlach, Gregory G. Raleigh, Michael Pollack