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
Method of enhancing corrosion resistance of hollow vessels
Local access to data while roaming with a mobile telephony device
Systems, methods and apparatus for payment processing
Power-on reset circuit
Peptide vectors
Conductive polymer and a solid electrolytic capacitor using the same as a solid electrolyte
AIN buffer N-polar GaN HEMT profile
  Randomly Featured Patents
Methods and apparatus for improving an RF excited reactive gas plasma
Semiconductor memory device and method of manufacturing for preventing bit line oxidation
Jewelry organizer
Process for preparation of 13,14-dihydro-PGF2 alpha derivatives
Stent fabrication via tubular casting processes
Delivery pressure compensation methods and apparatuses
Process for preparing high molecular weight organopolysiloxanes
Method and apparatus for making a polymeric coated fabric layer
Machine to sharpen bars to a point