Resources Contact Us Home
OFDM pilot tone tracking for wireless LAN

Image Number 12 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
Data consumption framework for semantic objects
Secondary battery pack including insulative mounting member into which PCM is inserted in lateral direction
Estimating optical characteristics of a camera component using sharpness sweep data
Method for inhibiting thermal run-away
Protocol delay measuring device and protocol delay measuring method
Hydrostatic pad pressure modulation in a simultaneous double side wafer grinder
Motor with power-generation coil module
  Randomly Featured Patents
Method for creating defect management information in an recording medium, and apparatus and medium based on said method
Wheel mounted decorative member
Aseptic structural rib for plastic containers
Preparation of substituted 1,2,4-triazolo[1,4-a]pyrimidine-2-sulfonanilides
Method for connection establishment in a radio system relaying packet-switched traffic
Spread spectrum spectral density techniques
Advanced patient management for defining, identifying and using predetermined health-related events
Catalytic cracking riser reactor
Ink jet print heads and methos for preparing them
Sealant for one-drop fill process