Receiver with tap-coefficient adjustments
First Claim
Patent Images
1. A process comprising:
- sampling, using plural samplers, an analog data input signal to yield respective data-symbol sequences, said data-symbol sequences including an output data-symbol sequence that is output from a receiver;
identifying, by comparing symbols across said data-symbol sequences generated by said sampling, sampling events including error events in said data-symbol sequences;
adjusting tap coefficients of a decision feedback equalizer based on said error events; and
setting reference levels for said plural samplers based in part on said tap coefficients, said setting including setting a reference level used by a sampler to yield said output data-symbol sequence, the setting including,generating an equalization signal as a sum of products of the tap coefficients and data-symbol values of the data-symbol sequences; and
applying a first bias to said equalization signal to yield a first of the reference signals, and a second bias or no bias to the equalization signal to yield a second reference signal offset with respect to the first reference signal.
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Abstract
A receiver can include a sampler module for sampling a data-bearing input signal to extract data encoded in the data-bearing analog input signal. The sampling results in data-symbol sequences. The data-symbol sequences can be used to identify error events. The identified error events can be used as a basis for adjusting tap coefficients. The tap coefficients can be used in setting reference levels for the sampler module.
31 Citations
19 Claims
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1. A process comprising:
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sampling, using plural samplers, an analog data input signal to yield respective data-symbol sequences, said data-symbol sequences including an output data-symbol sequence that is output from a receiver; identifying, by comparing symbols across said data-symbol sequences generated by said sampling, sampling events including error events in said data-symbol sequences; adjusting tap coefficients of a decision feedback equalizer based on said error events; and setting reference levels for said plural samplers based in part on said tap coefficients, said setting including setting a reference level used by a sampler to yield said output data-symbol sequence, the setting including, generating an equalization signal as a sum of products of the tap coefficients and data-symbol values of the data-symbol sequences; and applying a first bias to said equalization signal to yield a first of the reference signals, and a second bias or no bias to the equalization signal to yield a second reference signal offset with respect to the first reference signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A receiver comprising:
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a sampler module to generate data-symbol sequences at least in part by sampling an input data signal, said sampler module including plural samplers for sampling said input data signal relative to respective reference levels to yield data-symbol sequences, said data-symbol sequences including an output data-symbol sequence output from said receiver; and a decision feedback equalizer to adjust said respective reference levels for said plural samplers, including a reference level used by a sampler to yield said output data-symbol sequence, based on said data-symbol sequences and tap coefficients of said decision feedback equalizer, said decision feedback equalizer including, an error-event detector to identify error events by comparing symbols across said data-symbol sequences generated by said sampling, a tap-coefficient adjuster to adjust said tap coefficients based on said error events, an equalization signal generator to generate an equalization signal as a sum of products of the tap coefficients and data-symbol values of the data-symbol sequences, and a reference signal adjuster to adjust the reference signals by applying a first bias to said equalization signal to yield a first of the reference signals, and a second bias or no bias to the equalization signal to yield a second reference signal offset with respect to the first reference signal. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A process comprising:
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amplifying a received data input signal; sampling, using plural samplers, the amplified data input signal to yield plural respective data-symbol sequences, the sampling including sampling using a data output sampler using an output reference level to yield an output data-symbol sequence that is output from a receiver including the data output sampler; identifying sampling events including error events based on the data-symbol sequences; for each combination of error and tap coefficients for a decision feedback equalizer, determining an adjustment value; accumulating adjustment values; adjusting tap coefficients according to accumulated adjustment values; and setting reference levels, including said output reference level, for samplers, based on tap coefficients and data-symbol sequences, the setting including, generating an equalization signal as a sum of products of the tap coefficients and data-symbol values of the data-symbol sequences; and applying a first bias to said equalization signal to yield a first of the reference signals, and a second bias or no bias to the equalization signal to yield a second reference signal offset with respect to the first reference signal. - View Dependent Claims (17, 18, 19)
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Specification