Multi-Viterbi receive channel decoder
First Claim
1. A circuit comprising:
- a first Viterbi detector configured to generate a first estimate signal based on an equalized signal, wherein the first estimate signal includes preliminary non-return-to-zero data estimates;
a first filter configured to generate a first filtered signal based on a preliminary decision signal, wherein the preliminary decision signal is generated based on the first estimate signal including the preliminary non-return-to-zero data estimates; and
a second Viterbi detector in communication with the first Viterbi detector, wherein the second Viterbi detector is configured to generate a final decision signal based on a sum of (i) a delayed version of the equalized signal, and (ii) the first filtered signal, wherein the final decision signal comprises final non-return-to-zero estimates.
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Abstract
A circuit includes a first Viterbi detector configured to generate a first estimate signal based on an equalized signal. The first estimate signal includes preliminary non-return-to-zero data estimates. A first filter is configured to generate a first filtered signal based on a preliminary decision signal. The preliminary decision signal is generated based on the first estimate signal. A second Viterbi detector is in communication with the first Viterbi detector. The second Viterbi detector is configured to generate a final decision signal based on a sum of (i) a delayed version of the equalized signal, and (ii) the first filtered signal, wherein the final decision signal comprises final non-return-to-zero estimates.
7 Citations
20 Claims
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1. A circuit comprising:
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a first Viterbi detector configured to generate a first estimate signal based on an equalized signal, wherein the first estimate signal includes preliminary non-return-to-zero data estimates; a first filter configured to generate a first filtered signal based on a preliminary decision signal, wherein the preliminary decision signal is generated based on the first estimate signal including the preliminary non-return-to-zero data estimates; and a second Viterbi detector in communication with the first Viterbi detector, wherein the second Viterbi detector is configured to generate a final decision signal based on a sum of (i) a delayed version of the equalized signal, and (ii) the first filtered signal, wherein the final decision signal comprises final non-return-to-zero estimates. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A circuit comprising:
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a first Viterbi detector configured to (i) receive a first equalized signal, and (ii) generate a first estimate signal including preliminary non-return-to-zero data estimates based on the first equalized signal; a reconstruction filter configured to generate a first reconstructed data signal based on the first estimate signal; a delay circuit configured to (i) receive the first equalized signal and the first reconstructed data signal, (ii) delay the first equalized signal to generate a first delay signal, and (iii) generate a first output signal based on the first reconstructed data signal; and a second Viterbi detector in communication with the first Viterbi detector, wherein the second Viterbi detector is configured to generate, based on a second decision signal, a first decision signal including final non-return-to-zero estimates, and wherein the second decision signal is generated based on each of the first delay signal and the first output signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification