Phase-compensating constant modulus algorithm
AssigneeAgere Systems Inc.
InventorsPatrik Larsson, Jean-Jacques Werner, Jian Yang
Life of this patent
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Abstract
A receiver, comprising an adaptive filter, performs blind equalization using a modified form of the constant modulus algorithm (CMA). This modified form of CMA is referred to as phase compensating CMA (PC-CMA). PC-CMA includes a phase-compensating term in the tap updating algorithm of the equalizer such that convergence to a straight constellation is achieved without the need of a rotator.
Claims22
A method for use in a communications receiver, the method comprising the steps of:
- equalizing a signal with an adaptive filter;
- and
- blindly converging at least one of N tap coefficient vectors of the adaptive filter by using a modified form of a constant modulus based algorithm that uses a tap updating algorithm that includes a phase compensation term.
Apparatus for use in a receiver, the apparatus comprising:
- an adaptive filter having associated N tap coefficient vectors;
- and
- circuitry for adapting at least one of the N tap coefficient vectors by using a modified form of a constant modulus based algorithm that uses a tap updating algorithm that includes a phase compensation term.
Apparatus for use in performing blind equalization in a receiver, the apparatus comprising:
- a memory for storing N tap coefficient vectors;
- and
- a processor for adapting at least one of the N tap coefficient vectors by using a modified form of a constant modulus based algorithm that uses a tap updating algorithm that includes a phase compensation term.
Dependencies are inferred from the claim text.