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
Semiconductor device and manufacturing method thereof
Geographically self-labeling access points
Electronic device including predicted frequency error estimation of a voltage controlled oscillator and related methods
Charging current control method and charging system
Circuit for and method of enabling communication of cryptographic data
Biomedical electro-stimulator
Method and apparatus for displaying system status with a wide range of viewing angle
  Randomly Featured Patents
Modified polyester fiber and process for producing the same
Sawtooth waveform generation for a television receiver
Materials and methods for the purification of hydride gases
Apparatus, system and method for archery equipment
Zipper hand with puller fixed function
Method for manufacturing color filter
Absorbent garments with tailored stretch properties in the lateral direction
Supervised learning using multi-scale features from time series events and scale space decompositions
System for reduced peak power consumption by a cooking appliance
Reflector communications channel for automatic protection switching