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US 2003/0115061 A1Published application
MPSK equalizer
AssigneeBroadcom Corporation
InventorYue Chen
Life of this patent
Estimating the term…
Abstract
Methods and circuits for equalizers using a trellis having a reduced number of states and employing a partial retrace and tentative trace back procedure that simplifies the circuitry needed to perform metric calculations and to store the results. Exemplary embodiments also provide soft decisions. These soft decisions may be adaptively scaled by the estimated signal to noise ratio (SNR). Initial and final states may be programmably designated.
Claims20
A method of receiving input data comprising:
- receiving input data with an equalizer;
- performing forward metric computations using a trellis;
- performing backward metric computations using trellis,
- adding the forward metric computations to the backward metric computations to generate a joint metric;
- and
- selecting a joint metric for each symbol in the trellis.
3 more elements
A method of receiving input data comprising:
- receiving input data with an equalizer;
- determining an estimated signal to noise ratio;
- generating a soft decision indicating the reliability of a hard decision;
- and
- scaling the soft decision with the estimated signal to noise ratio.
2 more elements
An integrated circuit comprising:
- an equalizer configured to receive input data and generate hard and soft decisions;
- and
- an adaptive scaling factor circuit coupled to the equalizer,
- wherein the adaptive scaling factor circuit provides a signal related to an estimated signal to noise ratio, and wherein the equalizer scales the soft decisions based on the provided signal.
1 more element
Dependencies are inferred from the claim text.