Process for fast blind equalization of an adaptive equalizer
First Claim
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1. A blind equalization process for an adaptive equalizer including a plurality of taps, each having a corresponding coefficient, comprising the steps of:
- performing blind equalization on a subset of the coefficients in the adaptive equalizer, said subset comprising less than all of said coefficients;
determining if the coefficients of the subset have converged; and
if the coefficients of the subset have converged, then initiating a decision directed adaptive equalization process.
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Abstract
A blind equalization process (200) for an adaptive equalizer including a plurality of taps, each having a corresponding coefficient, is disclosed which comprises the following steps. Blind equalization (204) is performed on a subset of the coefficients in the adaptive equalizer. Then, if the coefficients have converged (206), a decision directed adaptive equalization process (220) is initiated.
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Citations
21 Claims
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1. A blind equalization process for an adaptive equalizer including a plurality of taps, each having a corresponding coefficient, comprising the steps of:
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performing blind equalization on a subset of the coefficients in the adaptive equalizer, said subset comprising less than all of said coefficients; determining if the coefficients of the subset have converged; and if the coefficients of the subset have converged, then initiating a decision directed adaptive equalization process. - View Dependent Claims (2, 3, 4)
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5. A blind equalization process for an adaptive equalizer including a plurality of taps, each having a corresponding coefficient, comprising the steps of:
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performing blind equalization on a subset of the coefficients in the adaptive equalizer; determining if the coefficients have converged; and if the coefficients have converged, then initiating a decision directed adaptive equalization process; wherein the step of performing blind equalization comprises the steps of; receiving a signal representing a received symbol; determining if the received signal is within a predetermined distance of an ideal signal representing a valid symbol; incrementing a count if the received signal is within the predetermined distance of the ideal signal; accumulating information from each symbol in response to the received signal; and repeating the receiving, determining, incrementing and accumulating steps a fixed number of times.
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6. A blind equalization process for an adaptive equalizer including a plurality of taps, each having a corresponding coefficient, comprising the steps of:
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performing blind equalization on a subset of the coefficients in the adaptive equalizer, including the steps of (a) receiving a signal representing a received symbol; (b) determining if the received signal is within a predetermined distance of an ideal signal representing a valid symbol; (c) incrementing a count if the received signal is within the predetermined distance of the ideal signal; (d) accumulating information from each symbol in response to the received signal; and (e) repeating the receiving, determining, incrementing and accumulating steps a fixed number of times; adjusting the subset of coefficients in response to the accumulated information; determining if the coefficients have converged; and if the coefficients have converged, then initiating a decision directed adaptive equalization process. - View Dependent Claims (7, 8, 9)
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10. A blind equalization process for an adaptive equalizer including a plurality of taps, each having a corresponding coefficient, comprising the steps of:
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performing blind equalization on a subset of the coefficients in the adaptive equalizer, including the steps of (a) receiving a signal representing a received symbol; (b) determining if the received signal is within a predetermined distance of an ideal representing a valid symbol; (c) incrementing a count if the received signal is within the predetermined distance of the ideal signal; (d) accumulating information from each symbol in response to the received signal; and (e) repeating the receiving, determining, incrementing and accumulating steps a fixed number of times; determining if the coefficients have converged; and if the coefficients have converged, then initiating a decision directed adaptive equalization process; wherein the receiving step comprises the step of receiving a pulse amplitude modulated signal modulated by multilevel digital symbols in the form of a constellation of valid symbols in which rows and columns are spaced apart.
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11. A blind equalization process for an adaptive equalizer including a plurality of taps, each having a corresponding coefficient, comprising the steps of:
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performing blind equalization on a subset of the coefficients in the adaptive equalizer, including the steps (a) receiving a signal representing a received symbol (b) determining if the received signal is within a predetermined distance of an ideal signal representing a valid symbol; (c) incrementing a count if the received signal is within the predetermined distance of the ideal signal; (d) accumulating information from each symbol in response to the received signal; and (e) repeating the receiving, determining, incrementing and accumulating steps a fixed number of times; determining if the coefficients have converged; and if the coefficients have converged, then initiating a decision directed adaptive equalization process; wherein the repeating step repeats the receiving, determining, incrementing and accumulating steps 512 times.
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12. A blind equalization process for an adaptive equalizer including a plurality of taps, each having a corresponding coefficient, comprising the steps of:
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performing blind equalization on a subset of the coefficients in the adaptive equalizer, including the steps of (a) receiving a signal representing a received symbol; (b) determining if the received signal is within a predetermined distance of an ideal signal representing a valid symbol; (c) incrementing a count if the received signal is within the predetermined distance of the ideal signal; (d) accumulating information from each symbol in response to the received signal; and (e) repeating the receiving, determining, incrementing and accumulating steps a fixed number of times; determining if the coefficients have converged; and
if the coefficients have converged, then initiating a decision directed adaptive equalization process;wherein the step of determining if the coefficients have converged comprises the steps of; comparing the count to a fixed predetermined threshold value; and if the count is greater than the fixed predetermined threshold value, then determining that the coefficients have converged. - View Dependent Claims (13)
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14. A blind equalization process for an adaptive equalizer including a plurality of taps, each having a corresponding coefficient, comprising the steps of:
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initializing a predetermined plurality of the coefficients to predetermined fixed values; performing blind equalization on a subset of the coefficients in the adaptive equalizer; determining if the coefficients have converged; and if the coefficients have converged, then initiating a decision directed adaptive equalization process; wherein the adaptive equalizer includes 128 taps symmetrically arranged about a middle point, and the predetermined plurality of coefficients comprises coefficients corresponding to the eight middle taps. - View Dependent Claims (15)
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16. A blind equalization process for an adaptive equalizer including a plurality of taps, each having a corresponding coefficient, comprising the steps of:
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performing blind equalization on a subset of the coefficients in the adaptive equalizer; determining if the coefficients have converged; and if the coefficients have converged, then initiating a decision directed adaptive equalization process;
whereinthe adaptive equalizer includes taps symmetrically arranged around a center point; and the step of performing blind equalization includes the step of selecting the subset of the coefficients corresponding to taps symmetrically arranged around the center point. - View Dependent Claims (17, 18)
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19. A blind equalization process for an adaptive equalizer including a plurality of taps, each having a corresponding coefficient, comprising the steps of:
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performing blind equalization on a subset of the coefficients in the adaptive equalizer; determining if the coefficients have converged; if the coefficients have converged, then initiating a decision directed adaptive equalization process; and if the coefficients have not converged, then repeating the step of performing blind equalization using a larger subset of coefficients. - View Dependent Claims (20, 21)
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Specification