Whitening of data-dependent, non-stationary noise in an inter-symbol interference channel detector
First Claim
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1. A decoder comprising:
- cascaded lattice filters that receive encoded data and that include adaptive inputs and output taps;
a Viterbi path memory unit and survival register unit circuit with a Viterbi input and a Viterbi output;
a tap control coupling a selected output tap from the cascaded lattice filters to the Viterbi input; and
a noise adaptation circuit that provides an adjustment to the adaptive inputs as a function of an estimated trellis transition sequence to whiten non-stationary noise.
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Abstract
A decoder includes cascaded lattice filters that receive encoded data and include adaptive inputs and output taps. A tap control couples a selected output tap to a viterbi input as a function of a viterbi output. A noise adaptation circuit provides adjustment to the adaptive inputs as a function of the viterbi output to whiten non-stationary noise that is received with the encoded data.
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Citations
19 Claims
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1. A decoder comprising:
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cascaded lattice filters that receive encoded data and that include adaptive inputs and output taps; a Viterbi path memory unit and survival register unit circuit with a Viterbi input and a Viterbi output; a tap control coupling a selected output tap from the cascaded lattice filters to the Viterbi input; and a noise adaptation circuit that provides an adjustment to the adaptive inputs as a function of an estimated trellis transition sequence to whiten non-stationary noise. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of decoding, comprising:
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providing encoded data to cascaded lattice filters that include adaptive inputs and output taps; selecting an output tap from the cascaded lattice filters and providing the selected output tap to a Viterbi input of “
a Viterbi path memory unit and survival register unit circuit”
in order to overcome a lack of antecedent basis issue; andproviding an adjustment to the adaptive inputs as a function of an estimated trellis transition sequence to whiten non-stationary noise. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A decoder comprising:
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cascaded lattice filters that receive encoded data and that include adaptive inputs and output taps; a Viterbi path memory unit and survival register unit circuit with a Viterbi input and a Viterbi output;
means for coupling a selected output tap from the cascaded lattice filters to the Viterbi input; and
means for providing an adjustment to the adaptive inputs as a function of an estimated trellis transition sequence to whiten non-stationary noise.
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Specification