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
Home appreciation participation notes
Vehicle motion control device
Profile-based user access to a network management system
Data architecture and user interface for plasma processing related software applications
Agents for preventing and treating disorders involving modulation of the ryanodine receptors
Electronic device including predicted frequency error estimation of a voltage controlled oscillator and related methods
Collaborative computing community role mapping system and method
  Randomly Featured Patents
Method and apparatus for communication within an integrated circuit
Cage position display apparatus for an elevator
High temperature electrochemical cell with molten alkali metal anode
Holder for a towel or similar article
Image recording apparatus with drum balancing
Stylet-free epidural catheter and thread assist device
Variable gain logic for a GPS based automatic steering system
Automobile tire
Package with lock mechanism