Channel Estimation Filter Normalization
AssigneeBroadcom Corporation
InventorsHari Moorthy, Wei Luo
Life of this patent
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Abstract
Disclosed are various embodiments providing processing circuitry for selecting a channel estimation filter from a plurality of channel estimation filters based on a channel quality metric, the selected channel estimation filter being associated with an intrinsic coefficient. The processing circuitry may then determine a scaled coefficient, the scale coefficient being based on scaling the intrinsic coefficient with respect to a bit size constraint, the bit size constraint being determined by a bit length of a multiplication circuitry operand. Moreover, the processing circuitry may generate an output based on the scaled coefficient and an input signal.
Claims20
A method for a processing circuit comprising:
- selecting a channel estimation filter from a plurality of channel estimation filters based on a channel quality metric, the selected channel estimation filter being associated with an intrinsic coefficient;
- determining a scaled coefficient, the scale coefficient being based on scaling the intrinsic coefficient with respect to a bit size constraint, the bit size constraint being determined by a bit length of a multiplication circuitry operand;
- and
- generating an output based on the scaled coefficient and an input signal.
A system for signal processing, comprising:
- a plurality of filters, each filter associated with a respective normalized coefficient, each filter configured to generate a respective multiplication product based on a multiplication of the respective normalized coefficient and a past time sample of an input signal, the past time sample being one of a plurality of sequential time samples of the input signal;
- circuitry that selects an updated filter by selecting one of the plurality of filters based at least on a channel quality metric;
- and
- circuitry that identifies a previously selected filter when the updated filter is selected;
- and
- circuitry that initializes the updated filter with input history of the previously selected filter, the input history of the previously selected filter comprising a multiplication product of a normalized coefficient of the previously selected filter and the past time sample of the input signal.
A channel estimation filter comprising:
- circuitry that enables the channel estimation filter based on a channel quality metric;
- a plurality of coefficients that optimize the channel estimation filter to operate in communication conditions characterized by the channel quality metric;
- an input terminal that is configured to receive an input signal comprising plurality of sequential time samples;
- and
- circuitry that generates a multiplication product for each coefficient, the circuitry being configured to generate the respective multiplication product based on the respective coefficient and a respective time sample of the input signal, the circuitry being constrained by an operand bit size, each coefficient being a fixed-point number that is scaled according to the operand bit size.
Dependencies are inferred from the claim text.