Digital receiver having adaptive carrier recovery circuit

Details Digital receiver having adaptive carrier recovery circuit Digital receiver having adaptive carrier recovery circuit

2004-01-15

2008-03-11

Fan, Chieh M. (Department: 2611)

Pulse or digital communications

Receivers

Angle modulation

C375S340000, C375S316000, C375S324000, C375S233000, C375S229000, C708S323000

Reexamination Certificate

active

07342981

ABSTRACT:
A digital receiver, that may be used to receive VSB/QAM digital television signals, includes an adaptive fine carrier recovery circuit that compensates for deviations in the carrier frequency or phase. The carrier recovery circuit de-rotates a signal including phase errors. Estimations of phase errors are filtered using a filter whose gain and bandwidth are adjusted adaptively. This allows the carrier recovery circuit to track phase/frequency offset without introducing significant jitter. In one embodiment, the receiver includes a DFE, and the adaptive carrier recovery circuit mitigates instability that might be associated with the DFE.

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Richard Citta & Gary Sgrignoli, “ATSC Transmission System: VSB Tutorial”, Zenith Electronics Corporation, Montreuz Symposium, Jun. 12, 1997.

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