Frequency offset correcting circuit

Details Frequency offset correcting circuit Frequency offset correcting circuit

H - Electricity

03

L

329/3, 363/8

H03L 7/00 (2006.01) H04J 11/00 (2006.01) H04L 27/26 (2006.01) H04L 27/38 (2006.01)

Patent

CA 1224540

ABSTRACT "Frequency Offset Correcting Circuit" A second-order phase-locked loop (PLL) is provided following a demodulating section which is arranged to detect the baseband signals of orthogonally multiplexed QAM signals. The second-order PLL, which is supplied with a baseband signal of a pilot channel from the demodulating section, includes a first and second control loops. The first control loop is adapted to correct a static phase shift of the pilot channel signal, while the second control loop functions to correct an abrupt frequency offset of same. The second-order PLL is further utilized to correct both static phase shifts and abrupt frequency offsets of data channels (viz., channels other than the pilot channel). A third control loop is further provided which extends between the second-order PLL and the input of the demodulating section, and which has a function by which static or slowly changing frequency offsets of the channels are compensated.

461724

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