Pulse or digital communications – Equalizers
Reexamination Certificate
2011-07-12
2011-07-12
Bayard, Emmanuel (Department: 2611)
Pulse or digital communications
Equalizers
C375S235000
Reexamination Certificate
active
07978758
ABSTRACT:
Methods and apparatus are provided for receiving a signal transmitted with a quadrature amplitude modulation (QAM) constellation. In an embodiment of the invention, a blind equalization algorithm can be performed to equalize the signal, and a constellation recovery algorithm can be performed to identify a constellation index corresponding to the QAM constellation. The blind equalization algorithm can be altered based on the identified constellation index. The invention advantageously allows for relatively efficient and relatively reliable equalization of signals transmitted with an unknown QAM constellation.
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Al-Dhahir, Naofal et al., “Efficient Computation of the Delay-Optimized Finite-Length MMSE-DFE,”IEEE Transactions on Signal Processing, vol. 44, No. 5, May 1996, pp. 1288-1292.
Godard, Dominique N., “Self-Recovering Equalization and Carrier Tracking in Two-Dimensional Data Communication Systems,” IEEE Transactions on Communications, vol. Com-28, No. 11, Nov. 1980.
Bayard Emmanuel
Marvell International Ltd.
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