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
Nuclear fuel assembly bottom nozzle
Arcuate motion control in electrostatic actuators
Methods and apparatuses for configuring and operating graphics processing units
System and method for efficient resource management of a signal flow programmed digital signal processor code
Mobile communication apparatus
System for hot-start amplification via a multiple emulsion
Network based technique for obtaining operator identifier for mobile devices
  Randomly Featured Patents
Method and apparatus for adaptive filtering by counting acoustic sample zeroes in ultrasound imaging
Curable fluoropolyether composition and integral molded resin/rubber articles
Area-efficient low-power bipolar current-mode logic
Single-crystal-like materials
Flow control apparatus and method
Image processing apparatus, processing method performed in image processing apparatus, and computer program product
Lift/tilt-bed trailer
Lingerie hanging device
Reinforced composite sandwich panel
Solvatochromatic bacterial detection