Digital receiver with tunable analog parameters and method therefor
First Claim
Patent Images
1. A method for processing a received data communication signal, said method comprising the steps of:
- extracting encoded digital data from said received data communication signal;
digitally decoding said encoded digital data;
obtaining, in response to said digitally decoding step, a present signal quality indicator and a past signal quality indicator;
comparing said present signal quality indicator to said past signal quality indicator;
generating a digital control signal in response to said comparing step; and
adjusting a tunable analog component in response to said digital control signal.
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Abstract
A digital data receiver includes tunable analog components having variable parameters that are responsive to the bit error rate (BER) of the decoded digital data. The analog components include a quadrature generator having a tunable phase shifter, an analog filter having a tunable bandwidth, a tunable magnitude equalizer circuit, a tunable group delay equalizer circuit, and an amplifier having an adjustable gain. The tunable components are controlled by tuning control signals that incorporate digitally-produced fine tuning signals. The digital tuning signals are altered in accordance with realtime changes in the BER.
76 Citations
18 Claims
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1. A method for processing a received data communication signal, said method comprising the steps of:
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extracting encoded digital data from said received data communication signal; digitally decoding said encoded digital data; obtaining, in response to said digitally decoding step, a present signal quality indicator and a past signal quality indicator; comparing said present signal quality indicator to said past signal quality indicator; generating a digital control signal in response to said comparing step; and adjusting a tunable analog component in response to said digital control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for processing a received data communication signal, said method comprising the steps of:
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conditioning said received data communication signal with an analog circuit having at least one tunable analog component; extracting encoded digital data from said received data communication signal; digitally decoding said encoded digital data; obtaining, in response to said digitally decoding step, a signal quality indicator responsive to a bit error rate, said bit error rate being generated by a maximum-likelihood digital decoder circuit; and regulating, in response to said signal quality indicator, said at least one tunable analog component.
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14. A method for processing a received data communication signal, said method comprising the steps of:
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conditioning said received data communication signal with an analog circuit having at least one tunable analog component; extracting encoded digital data from said received data communication signal; digitally decoding said encoded digital data; obtaining, in response to said digitally decoding step, a signal quality indicator that is a present signal quality indicator; comparing said present signal quality indicator to a past signal quality indicator; generating at least one digital control signal in response to said comparing step; and regulating, in response to said signal quality indicator and said at least one digital control signal, said at least one tunable analog component.
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15. A data communications receiver that processes a received data communication signal which includes an in-phase (I) component and a quadrature (Q) component, said receiver comprising:
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data extraction means for extracting encoded digital data from said received data communication signal; decoding means, coupled to said data extraction means, for digitally decoding said encoded digital data and generating a signal quality indicator; means for generating a tuning control signal in response to said signal quality indicator, said means for generating being coupled to said decoding means; and a tunable analog component having a variable parameter responsive to said tuning control signal, said tunable analog component being coupled to said means for generating, wherein said tunable analog component comprises a quadrature signal generator having a variable phase shifter, and said tuning control signal is configured to adjust said phase shifter to vary relative phase between said I and Q components.
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16. A data communications receiver that processes a received data communication signal, said receiver comprising:
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data extraction means for extracting encoded digital data from said received data communication signal; decoding means, coupled to said data extraction means, for digitally decoding said encoded digital data and generating a signal quality indicator; means for generating a tuning control signal in response to said signal quality indicator, said means for generating being coupled to said decoding means; and a tunable analog component having a variable parameter responsive to said tuning control signal, said tunable analog component being coupled to said means for generating; and an analog bandpass filter configured to filter said received data communication signal and to produce a filtered data communication signal into which magnitude distortion has been introduced by said analog bandpass filter, wherein; said tunable analog component comprises a magnitude equalizer circuit having adjustable magnitude and frequency parameters and being configured to equalize said filtered data communication signal to compensate for said magnitude distortion introduced by said analog bandpass filter and to produce an equalized data communication signal; said data extraction means extracts said encoded digital data from said equalized data communication signal; and said tuning control signal is configured to adjust said magnitude and frequency parameters of said magnitude equalizer circuit.
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17. A data communications receiver that processes a received data communication signal, said receiver comprising:
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data extraction means for extracting encoded digital data from said received data communication signal; decoding means, coupled to said data extraction means, for digitally decoding said encoded digital data and generating a signal quality indicator; means for generating a tuning control signal in response to said signal quality indicator, said means for generating being coupled to said decoding means; and a tunable analog component having a variable parameter responsive to said tuning control signal, said tunable analog component being coupled to said means for generating; and an analog bandpass filter configured to filter said received data communication signal and to produce a filtered data communication signal into which group delay has been introduced by said analog bandpass filter, wherein; said tunable analog component comprises a group delay equalizer circuit having adjustable group delay and frequency parameters and being configured to equalize said filtered data communication signal to compensate for said group delay introduced by said analog bandpass filter and to produce an equalized data communication signal; and said tuning control signal is configured to adjust group delay and frequency parameters of said group delay equalizer circuit.
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18. A data communications receiver that processes a received data communication signal, said receiver comprising:
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data extraction means for extracting encoded digital data from said received data communication signal; decoding means, coupled to said data extraction means, for digitally decoding said encoded digital data and generating a signal quality indicator; means for generating a tuning control signal in response to said signal quality indicator, said means for generating being coupled to said decoding means; a tunable analog component, coupled to said means for generating, comprising an amplifier circuit configured to amplify said received data communication signal, said tunable analog component having a variable parameter responsive to said tuning control signal, and said tuning control signal being configured to adjust a gain of said amplifier circuit; and an analog-to-digital converter circuit coupled to said amplifier circuit and having a loading factor responsive to said gain.
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Specification