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
Process for making diethyl ether from acetic acid
Information processing apparatus, information outputting method and computer program storage device
Method of treating lung cancer
Look up table (LUT) structure supporting exclusive OR (XOR) circuitry configured to allow for generation of a result using quaternary adders
Process of preparing functionalized polymers via enzymatic catalysis
Functionalized main chain polymers
Methods and apparatuses for configuring and operating graphics processing units
  Randomly Featured Patents
Telescopic turntable
Brake system of vehicle for simultaneous execution of driver's braking and automatic behavior control
Closable knife with opening mechanism
EEPROM cell using P-well for tunneling across a channel
Table game
Multi-layer release films
Swirl generator with axial vanes
Measuring device for determining a thread length of a fastener
Push switch
System for real-time control of semiconductor wafer polishing