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US 8,276,052 B1Granted
Iterative PRBS seed recovery using soft decisions
AssigneeMarvell International Ltd.
InventorsJamal Riani, Haoli Qian
Life of this patent
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Abstract
A system and method for recovering the seed of a pseudo-random binary sequence (PRBS) using soft decisions is disclosed. In some implementations, a log-likelihood ratio is calculated to determine the certainty with which each bit in the seed has been recovered, and in some implementations, the value of the PRBS is used in the calculation of the log-likelihood ratio. In some implementations, a linear feedback shift register stores the log-likelihood ratio for each bit in the sequence.
Claims19
A system comprising
- a Pseudo Random Binary Sequence (PRBS) generator operative to generate a PRBS;
- and
- a seed recovery module operative to recover a seed of a received PRBS to synchronize the generated PRBS and the received PRBS;
- wherein said seed recovery module uses the received PRBS to iteratively determine a log-likelihood ratio that a bit of the seed has been accurately estimated and outputs the log-likelihood ratio to be stored in the PRBS generator until the seed is recovered.
1 more element
A method comprising:
- receiving a Pseudo Random Binary Sequence (PRBS) from a PRBS generator;
- generating a PRBS to be synchronized with the received PRBS by recovering a seed of the received PRBS;
- said recovering comprising determining a log-likelihood ratio that a bit of the seed has been accurately estimated and outputting the log-likelihood ratio to be stored in the PRBS generator;
- and
- continuing said recovering until the log-likelihood ratio for every bit in the generated PRBS is above a threshold.
2 more elements
Dependencies are inferred from the claim text.