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
Charged particle beam apparatus
Computer systems and methods for the query and visualization of multidimensional databases
Single integrated circuit configured to operate both a capacitive proximity sensor device and a resistive pointing stick
Synergistic preparations based on mixtures of glycerol ether with aromatic alcohol for controlling mycobacteria
Bitter taste receptors
Controlling a video window position relative to a video camera position
Method of patterning color conversion layer and method of manufacturing organic EL display using the patterning method
  Randomly Featured Patents
9-ketospinosyn derivatives
Method of and apparatus for optimizing transference of supplementary paper money in automatic teller machine by monitoring the paper money processing operation
Shared processor data entry system
Process and apparatus for detecting vehicle impact
Method of controlling a frequency converter of a reluctance machine
Thin film transistor array panel and method for manufacturing the same
Data compression/decompression apparatus and method
Thread loop taker device of a zigzag sewing machine
System for measuring non-volatile residue in ultra pure water
Methods for manufacturing articles of manufacture from hydraulically settable mixtures