Patents Represented by Attorney Steven A. Shaw

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  • Method of synchronization for packet based, OFDM wireless systems with multiple receive chains
    Patent number: 7492843
    Abstract: A system for synchronizing a wireless receiver is provided. The system includes a first antenna (101a) and a second antenna (101b) to receive wireless signals containing data packets. The system includes one or more analyzer components (156) operable to determine correlation metrics based on at least a portion of the first received signal and a portion of the second received signal. The system further includes a synchronization component (158) operable to use the correlation metrics to determine a preferred correlation metric for synchronization by the wireless receiver of the first and second received signals to decode the data packet. A method for synchronizing a receiver of two wireless signals is also provided.
    Type: Grant
    Filed: October 27, 2004
    Date of Patent: February 17, 2009
    Assignee: Texas Instruments Incorporated
    Inventors: Michael T. DiRenzo, David P. Magee, Manish Goel
  • Noise analysis in a communication system
    Patent number: 7492703
    Abstract: A system is provided to automatically estimate performance of a receiver for receiving input signals, the input signals having a carrier frequency and a baud rate, from a channel in a communication system and the effect of highly correlated noise cancellation on performance of the receiver, while no active transmission is occurring on the channel, comprising: a digital front end in the receiver for receiving samples of the input signals; a predictor coupled to the digital front end for predicting highly correlated noise in a second sample of the input signal; and a subtraction unit coupled to the predictor for subtracting the predictor output from the second sample to determine residual noise in the second sample. Other systems and methods are disclosed.
    Type: Grant
    Filed: October 18, 2002
    Date of Patent: February 17, 2009
    Assignee: Texas Instruments Incorporated
    Inventors: Itay Lusky, Daniel Wajcer, Yosef Bendel, Yigal Bitran, Naftali Sommer, Ofir Shalvi, Zvi Reznic, Ariel Yagil, Ran Senderovitz, Eli Haim
  • Versatile system for optimizing data fragmentation in digital communications
    Patent number: 7492702
    Abstract: The present invention provides a versatile system for optimizing data fragmentation in a digital communications—particularly OFDM communications—system. A digital transmission system (100) is provided, having a PHY-level constraint. An array (104, 112) of data transmission parameters (106-110, 114-116), relating to the digital transmission system, is provided. A fragmentation construct (102) is provided, and adapted to determine a number of symbols required to transmit a given data transmission payload. The fragmentation construct calculates (118), based on the number symbols required, and on certain parameter information from the array, a number of bytes of data that must be transmitted in the given data transmission payload in order to minimize pad bits added to the data transmission payload.
    Type: Grant
    Filed: July 28, 2005
    Date of Patent: February 17, 2009
    Assignee: Texas Instruments Incorporated
    Inventors: Anuj Batra, Jin-Meng Ho, Srinivas Lingam, Jaiganesh Balakrishnan
  • System and method to facilitate time domain sampling for solid state imager
    Patent number: 7474345
    Abstract: A time domain sampling technique for a CMOS imager enables a wide dynamic range and flexibility by employing up to two-degrees of freedom during such sampling. Two degrees of freedom can be achieved by making one or both of an integration time and a reference (e.g., voltage or current) variable during sampling. The sampling (or image capture) is implemented by associating a time with when a pixel has a desired value relative to the reference in response to the pixel receiving incident light. The reference can be fixed or variable during different portions of the sampling, and further can be programmable to implement a desired sampling pattern for a given application.
    Type: Grant
    Filed: August 12, 2002
    Date of Patent: January 6, 2009
    Assignee: Texas Instruments Incorporated
    Inventors: Qiang Luo, Zhiliang Julian Chen, John G. Harris, Steve Clynes, Michael Erwin
  • Method and apparatus for channel quality metric generation within a packet-based multicarrier modulation communication system
    Patent number: 7471745
    Abstract: A communication system disclosed herein includes a channel quality estimation module that determines the channel quality metric utilizing the preamble portion of the packet only. Data, in such a communication system, is transmitted in the form of a packet over a data channel during a packet transmission, wherein each data channel includes several subchannels. The system includes a receiver having at least a baseband processor. The baseband processor couples to receive each baseband sample signal. Specifically, the baseband processor calculates the gain estimation of the each subchannel and generates a channel quality metric for each subchannel that is derived by deinterleaving the sequence of gain estimation magnitudes, convolving the deinterleaved sequence of gain estimation magnitudes with a short window index, and detecting the number of times the convolution falls beneath a predetermined threshold.
    Type: Grant
    Filed: March 24, 2003
    Date of Patent: December 30, 2008
    Assignee: Texas Instruments Incorporated
    Inventors: Kofi D. Anim-Appiah, Richard G. C. Williams, Anuj Batra
  • Method and apparatus for adaptive channel equalization using decision feedback
    Patent number: 7469003
    Abstract: The equalizer circuit (200) equalizes the channel prior to despreading thereby restoring the orthogonality of signals that typically exists in the forward link of CDMA systems and thus suppressing interference and improving the performance. The equalization method is based on the well-established normalized least-mean-squares (NLMS) algorithm. The tracking ability and the strength of the training signal of the NLMS are enhanced in the invention by using data feedback, in addition to the common pilot, to form the training signal. Based on initial data decisions, the transmitted signal can be reconstructed and included in the training signal. In cases where the transmitted signal for the receiver employs several codes as in a multicode transmission environment, the quality of the training signal can be significantly improved.
    Type: Grant
    Filed: November 22, 2002
    Date of Patent: December 23, 2008
    Assignee: Texas Instruments Incorporated
    Inventor: Aris Papasakellariou
  • Switching regulator with analog or digital control
    Patent number: 7463011
    Abstract: A switching regulator provided according to an aspect of the present invention contains uses one or more error samples from prior iterations, in addition to an error sample of the present iteration, to determine the correction for the present iteration. Due to the use of multiple samples, a switching regulator may provide a regulated signal which is at least substantially constant even in the presence of line/load variations. A controller determining the correction can be implemented either in analog or digital domain.
    Type: Grant
    Filed: April 5, 2005
    Date of Patent: December 9, 2008
    Assignee: Texas Instruments Incorporated
    Inventor: Anmol Sharma
  • Skip counter for system timer
    Patent number: 7461283
    Abstract: A skip counter timing device employing a typical hardware system timer, a skip counter with a skip count register, a signal gate and a hardware system tick counter as a single sleep mode enhancing skip counter. In an exemplary embodiment, said skip counter is operatively interconnected to a legacy operating system, with said operating system being configured for said interconnection. Use of said skip counter provides the benefits of: 1) allowing CPU shutdown during device sleep modes while 2) eliminating the need for the CPU to perform fractional mathematical calculations in recalculating accurate timer settings upon factional time-slice timer interrupt firings at CPU restarts and thus 3) avoiding overloading CPU resources at said restarts and 4) eliminating incremental and cumulative inaccuracies associated with recalculating timer settings in dynamic timer-managed systems.
    Type: Grant
    Filed: March 23, 2005
    Date of Patent: December 2, 2008
    Assignee: Texas Instruments Incorporated
    Inventor: Vitaly Andrianov
  • Bi-modal RF architecture for low power devices
    Patent number: 7460890
    Abstract: A wireless receiver is provided that includes a component and a power control logic 80. The component is operable to receive a wireless signal and process the wireless signal in at least one of a first mode and a second mode. The first mode uses less power than the second mode. The power control logic 80 is operable based on a characteristic of the wireless signal to promote processing the wireless signal by the component in the at least one of the first and second modes. A method for a wireless receiver to process the wireless signal to reduce power consumption is also provided. The method includes determining a characteristic of the wireless signal, and selecting one of a first and second modes in which to process the signal based on the characteristic of the wireless signal.
    Type: Grant
    Filed: July 28, 2005
    Date of Patent: December 2, 2008
    Assignee: Texas Instruments Incorporated
    Inventors: Jie Liang, Nathan R. Belk
  • Error free dynamic rate change in a digital subscriber line DSL with constant delay
    Patent number: 7457993
    Abstract: A method for changing the data rate over an interleaved latency path overcomes shortfalls of the ADSL2 seamless rate adaptation (SRA) and dynamic rate repartitioning (DRR). The interleaver depth is allowed to change during either a rate charge or rate repartioning so that the interleaver delay is constant before and after the change. The transmitter pauses its transmission for a time approximately equal to the delay of the interleaver so that there are approximately no errors introduced at the receiver.
    Type: Grant
    Filed: November 16, 2005
    Date of Patent: November 25, 2008
    Assignee: Texas Instruments Incorporated
    Inventor: Cory S. Modlin
  • Frequency switched preamble design to minimize channel estimation time in MIMO communications systems
    Patent number: 7457232
    Abstract: A preamble frequency switching design technique for frequency switching the training symbols within the preamble associated with a MIMO communication system ensures that data throughput is optimized.
    Type: Grant
    Filed: August 30, 2004
    Date of Patent: November 25, 2008
    Assignee: Texas Instruments Incorporated
    Inventors: David P Magee, Manish Goel, Michael T. Direnzo, Michael O. Polley
  • Scalable gain training generator, method of gain training and MIMO communication system employing the generator and method
    Patent number: 7457369
    Abstract: The present invention provides a gain training generator for use with a multiple-input, multiple-output (MIMO) transmitter employing N transmit antennas where N is at least two. In one embodiment, the gain training generator includes a fundamental training encoder configured to provide a basic gain training sequence to one of the N transmit antennas during a time interval to produce a basic gain training waveform having a basic peak-to-average ratio (PAR). Additionally, the gain training generator also includes a supplemental training encoder coupled to the fundamental training encoder and configured to further provide (N?1) supplemental gain training sequences to (N?1) remaining transmit antennas, respectively, during the time interval to produce supplemental gain training waveforms wherein each has a supplemental PAR substantially equal to the basic PAR.
    Type: Grant
    Filed: January 4, 2005
    Date of Patent: November 25, 2008
    Assignee: Texas Instruments Incorporated
    Inventors: David P. Magee, Michael T. DiRenzo, Manish Goel
  • Tunable filter to facilitate communications
    Patent number: 7457258
    Abstract: Systems and methods are described herein for changing the frequency response of a filter, such as a hybrid circuit. One or more tunable components are adjustable to provide the hybrid circuit with a frequency response corresponding to the characteristics of an associated communications network, such as a digital subscriber link.
    Type: Grant
    Filed: December 31, 2003
    Date of Patent: November 25, 2008
    Assignee: Texas Instruments Incorporated
    Inventors: Philip Sean Stetson, Richard Knight Hester
  • System and method for prioritizing data transmission and transmitting scheduled wake-up times to network stations based on downlink transmission duration
    Patent number: 7457973
    Abstract: A new system and method is described, utilizing a scheduler based on a transmission time calculation and prioritizing algorithm. The system utilizes a Schedule Information Vector (SIV) protocol for saving power in wireless local area networks. The system comprises an access point having a priority queue, one or more stations, an SIV frame comprising an association ID for identifying one of the stations and a scheduled wake-up time for the identified station. An algorithm is employed for calculating the transmission time of downlink data for the stations. The access point originates and transmits to the one or more stations the SIV frame of the scheduled wake-up times. The current data to be transmitted to each station is accessed by the algorithm to determine the total transmission time to each station.
    Type: Grant
    Filed: June 20, 2003
    Date of Patent: November 25, 2008
    Assignee: Texas Instruments Incorporated
    Inventor: Yonghe Liu
  • Interoperability of ADPCM encoded voice communications
    Patent number: 7453889
    Abstract: Providing interoperability on a voice communication network by detecting incompatible bit packing payload formats of ADPCM encoded voice data signals in an encoder/decoder. A mismatch of bit packing formats between little endian format and big endian format is determined by detecting the occurrence of ADPCM code words of interest in the decoded voice data stream out of the encoder/decoder. The invention may be applied to an ITU G.726 encoder/decoder.
    Type: Grant
    Filed: February 2, 2005
    Date of Patent: November 18, 2008
    Assignee: Texas Instruments Incorporated
    Inventors: Satish Kumar M. Mundra, Daniel C. Thomas
  • Method and system of tone ordering for discrete multi-tone systems with tone grouping
    Patent number: 7453930
    Abstract: The present disclosure describes a method and system of tone ordering for discrete multi-tone (DMT) systems with tone grouping. Some illustrative embodiments may include a method, comprising, dividing a plurality of sub-channels within a discrete multi-tone symbol into a plurality of groups, selecting each sub-channel of the plurality of sub-channels in non-sequential sub-channel order from the plurality of groups, and assigning data bits in bit order to each sub-channel in the order in which each sub-channel is selected. Each group comprises an equal number of sub-channels, and each sub-channel comprises a frequency bin with a unique center frequency.
    Type: Grant
    Filed: June 16, 2005
    Date of Patent: November 18, 2008
    Assignee: Texas Instruments Incorporated
    Inventor: Arthur J. Redfern
  • Method and apparatus for multicarrier channel estimation and synchronization using pilot sequences
    Patent number: 7450654
    Abstract: Method and apparatus for OFDM synchronization and channel estimation. In a temporal embodiment, received embedded system pilot symbols are inverse Fourier transformed at expected index locations and correlated with computed complex conjugates of inverse Fourier transforms of pilot symbols for providing a correlation function for the channel impulse response. In a frequency domain embodiment, embedded system pilot symbols are augmented with pilot-spaced inferred guard band symbols, multiplied by scaled complex conjugates of computed pilot systems, and inverse Fourier transformed into the channel impulse response. Time and frequency are synchronized in feedback loops from information in the channel impulse response. The channel impulse response is filtered, interpolated, and then Fourier transformed for determining channel estimates for equalization.
    Type: Grant
    Filed: August 15, 2006
    Date of Patent: November 11, 2008
    Assignee: Texas Instruments Incorporated
    Inventors: Manoneet Singh, Arvind Lonkar, Jerry Krinock
  • Timing recovery of PAM signals using baud rate interpolation
    Patent number: 7428282
    Abstract: A timing recovery method enables interpolation of PAM signals sampled at baud rate. The method exploits the structure of the PAM signal and also the smoothness of the channel pulse response. The resulting interpolator is an adaptive linear filter; and its taps can be adapted with the LMS algorithm. Using this interpolator enables a user to significantly reduce the complexity of the analog clock control circuit. A Gigabit Ethernet receiver that controls the A/D clock by selecting one of several evenly space clock phases, for example, reduced the required number of clock phases from 64 to 16.
    Type: Grant
    Filed: August 30, 2004
    Date of Patent: September 23, 2008
    Assignee: Texas Instruments Incorporated
    Inventor: Naftali Sommer
  • Protocol replay system
    Patent number: 7428664
    Abstract: An expert protocol analyzer, which records a protocol exchange between two or more hardware devices on a network or software modules in a multiprogramming environment. To validate a potential fix, the protocol is replayed in a simulated network environment, where a replay unit replaces the endpoint that is not available in the lab, or which in the lab operates with a different timing. The replay unit behaves like one of the two original units of the. Individual messages are adjusted for the local network parameters and are sent with precise delay or timing recorded during the original exchange. This allows the user to recreate the failure scenario in the test lab.
    Type: Grant
    Filed: January 31, 2005
    Date of Patent: September 23, 2008
    Assignee: Texas Instruments Incorporated
    Inventor: Mihai Sirbu
  • System and method of removing discrete spurious signals in cable broadband and other RF environments
    Patent number: 7428281
    Abstract: A system and method of removing discrete spurious signals in cable broadband environments as well as in other RF environments employs either non-decision directed or decision directed techniques in order to remove the discrete spurious signals. The non-decision directed technique converts the signal of interest such that the spurious signal's frequency is approximately zero, filters out the converted spurious signal, and then reconverts the signal of interest back to its original location. The decision directed technique employs a decision mechanism such as a slicer to regenerate a spurious signal that is subtracted from the signal of interest containing the actual spurious signal such that the actual spurious signal is removed from the signal of interest.
    Type: Grant
    Filed: August 31, 2004
    Date of Patent: September 23, 2008
    Assignee: Texas Instruments Incorporated
    Inventors: Nir Sasson, Raanan Yechezkel, Uri Garbi, Alon Elhanati, Naftali Sommer