Multiplex communications – Generalized orthogonal or special mathematical techniques
Reexamination Certificate
2004-03-29
2009-11-10
Ngo, Ricky (Department: 2416)
Multiplex communications
Generalized orthogonal or special mathematical techniques
C375S260000
Reexamination Certificate
active
07616553
ABSTRACT:
A multi-point communications system is set forth herein. The communications system comprises a transmitter for transmitting OFDM/DMT symbols over a predetermined number of bins across a transmission medium. The OFDM/DMT symbols are generated using at least one timing signal. At least one of the predetermined number of bins includes a pilot tone sub-symbol having a frequency corresponding to the clock signal. The communications system also includes a receiver for receiving the OFDM/DMT symbols from the transmission medium. The receiver demodulates the received symbols using at least one timing signal. The receiver has a first pilot tone search mode of operation in which the receiver adjusts its timing signal to scan the frequency range of the predetermined number of bins looking for the pilot tone sub-symbol and identifies the bin including the pilot tone sub-symbol. The receiver further has a subsequent second pilot tone acquisition mode in which the receiver adjusts the timing signal to receive the identified bin containing the pilot tone sub-symbol and measures phase differences between successive pilot tone sub-symbols to thereby perform a further adjustment of the timing signal so that the pilot tone sub-symbol is received within a frequency range sufficient for subsequent phase locked loop processing thereof.
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Chandran Ravi
Kapoor Samir
Marchok Daniel J.
Hamilton Brook Smith & Reynolds P.C.
Ngo Ricky
Tellabs Operations Inc.
Yuen Kan
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