Intellectual Ventures I LLC

Globespan Virata Corporation

Conexant, Inc.

Daniel Davidson MacFarlane Shearer, Iii

Michael J Seals

A carrier tracking circuit includes a first phase adjustment circuit coupled to an input of a delay element and a second phase adjustment circuit coupled to an output of the delay element. A phase correction circuit is coupled to output of the delay element is operable to generate a phase adjustment value based upon a data symbol output from the delay element. The phase correction circuit includes a double phase correction circuit to prevent double application of the same phase adjustment value to a symbol by both the first and second phase adjustment circuits. The carrier tracking circuit may be used in OFDM communications systems with each data symbol being an OFDM symbol and with the delay element being an FFT. The carrier tracker circuit also may include a feed forward circuit for correcting the phase error of a given data symbol using a phase error generated from that symbol.

Carrier tracking circuit and method including dual numerically controlled oscillators and feedforward phase correction coefficient

A radar detector ( ) includes a first period detector ( ), a second period detector ( ) and a third period detector ( ) within a multi-period periodicity validator . The first period detector ( ) detects radar pulses exhibiting one-half of an expected pulse period ( ), the second period detector ( ) detects radar pulses exhibiting the expected pulse period ( ), and the third period detector ( ) detects radar pulses exhibiting twice the expected pulse period ( ). A plurality of pulse-train records ( ) can simultaneously track a plurality of possible pulse trains. A control element ( ) accounts for missing pulses and corrects the expected pulse period when missing pulses have caused the expected pulse period to be inaccurate.

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Scottsdale, AZ, United States of America

Daniel Davidson MacFarlane Shearer, Iii