Resources Contact Us Home
OFDM pilot tone tracking for wireless LAN

Image Number 5 for United States Patent #7551677.

A pilot phase tracking loop for an OFDM receiver including a phase rotator receiving an incoming signal, a fast Fourier transform coupled to a phase rotator output, and a pilot phase error metric including a discrete Fourier transform portion coupled to the phase rotator output. The pilot phase error metric determines a phase error estimate associated with a received OFDM symbol, e.g., a data symbol, from the phase rotator output. A loop filter is coupled to the pilot phase error metric output and an oscillator is coupled to the loop filter output. The oscillator output is coupled to the phase rotator to adjust the phase of subsequent OFDM symbols of the incoming signal. Phase noise introduced by a radio portion of the OFDM receiver and OFDM transmitter is reduced by the baseband portion of the OFDM receiver improving OFDM signal tracking under poor SNR conditions.

  Recently Added Patents
Beverage container lid
Printing apparatus and method of operation of a printing apparatus
Playlist search device, playlist search method and program
Method for restricting the use of an application program, system for authenticating the user of a measuring apparatus, authentication server, client apparatus and storage medium
Surface-emitting laser light source using two-dimensional photonic crystal
Advanced CAPTCHA using images in sequence
Method to alter silicide properties using GCIB treatment
  Randomly Featured Patents
Providing privacy settings for applications associated with a user profile
Rotary polygonal mirror and method of making the same
Vivaldi antenna
Method of manufacturing DNA chip
Drive mechanism for dough shaping apparatus
Lighted product dispenser
Vehicle engine mount
System, method, and computer program product for conveying a status of a plurality of security applications
Apparatus for introducing stacks of paper layers into cartons
Motor oil change kit and catch pan for use in changing automotive motor oil