Patents by Inventor Andrew Robert Nix

Andrew Robert Nix 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).

  • Signal processing apparatus and method
    Patent number: 7782981
    Abstract: A signal processing apparatus (200) comprises a plurality of receive antennas (216a-m) arranged to receive a composite signal containing a plurality of transmitted symbols. A joint detector-decoder (218) iteratively enumerates most probable symbols received at the receive antennas (216am) using an enumeration constraint. A processor (220) determines a bit stream corresponding to each most probable received symbol. A method of signal processing for MIMO systems is also disclosed.
    Type: Grant
    Filed: March 31, 2004
    Date of Patent: August 24, 2010
    Inventors: Michael Dean, Paul Nicholas Fletcher, Andrew Robert Nix, Mohamad Kamree Abdul Aziz
  • Signal Processing Apparatus and Method
    Publication number: 20080049862
    Abstract: A signal processing apparatus (200) comprises a plurality of receive antennas (216a-m) arranged to receive a composite signal containing a plurality of transmitted symbols. A joint detector-decoder (218) iteratively enumerates most probable symbols received at the receive antennas (216am) using an enumeration constraint. A processor (220) determines a bit stream corresponding to each most probable received symbol.
    Type: Application
    Filed: March 31, 2004
    Publication date: February 28, 2008
    Applicant: QINETIQ LIMITED
    Inventors: Michael Dean, Paul Nicholas Fletcher, Andrew Robert Nix, Mohamad KAmree Abdul Aziz
  • OFDM receiver with adaptive equalizer
    Patent number: 6963617
    Abstract: An OFDM receiver includes an adaptive equalizer, which acts on a received signal, after conversion to digital samples. After filtering by the equalizer, any guard interval is removed, and a Fast Fourier Transform is applied to the signal. The data signal is then estimated and the estimated data is supplied as an output. The estimated data also has any guard interval reinserted, and is applied to an Inverse Fast Fourier Transform, and is fed back to the equalizer to allow adaptation of the tap coefficients thereof.
    Type: Grant
    Filed: January 24, 2000
    Date of Patent: November 8, 2005
    Assignee: University of Bristol
    Inventors: Simon Armour, David Roger Bull, Andrew Robert Nix
  • Image-reject mixers
    Patent number: 5950119
    Abstract: An image-reject mixer includes a process for adding a signal to a RF input signal. Any imbalance in the mixer circuitry, which would lead to imperfect image suppression, is corrected by detecting any resulting local oscillator component in the mixer output signal, and adjusting the balance to minimize the size of the local oscillator component.
    Type: Grant
    Filed: September 24, 1997
    Date of Patent: September 7, 1999
    Assignee: University of Bristol
    Inventors: Joseph Peter McGeehan, Mark Anthony Beach, Andrew Robert Nix, Peter Blakeborough Kenington