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
Image processing apparatus, image processing method, and program
Copolymer for positive type lithography, polymerization initiator used in production of said copolymer, and composition for semiconductor lithography
Related news articles
Electronic system auto-mute control circuit and control method thereof
Accessing device via communication protocol selection
High voltage circuit for electrical stimulation
  Randomly Featured Patents
Chain tensioner device
Fiber for reinforcing concrete or similar materials made of wire of a flat material strip and device for manufacturing such fibers
Control valve assembly
Aqueous solution for cell preservation
Wind turbine generator and yaw driving method for wind turbine generator
Community management for electronic business to business transactions
Use of 1,4-dihydropyridine derivatives and combinations thereof with calcitonins
Catalyst for use in producing acetic acid, process for producing the catalyst, and process for producing acetic acid using the catalyst
Multi-parameter integrated cuvette pool