Error detection/correction and fault detection/recovery – Pulse or data error handling – Digital logic testing
Reexamination Certificate
2006-02-21
2006-02-21
Tu, Christine T. (Department: 2133)
Error detection/correction and fault detection/recovery
Pulse or data error handling
Digital logic testing
C714S782000
Reexamination Certificate
active
07003708
ABSTRACT:
A method and apparatus that enable a Poisson distribution to be approximated by generating random bit sequences over a number of clock cycles. The apparatus of the present invention comprises a Poisson distribution module that includes logic configured to modulo-2 add at least two pseudo-random bit sequences (PRBSs) together to generate a number of PRBSs, which are then compared to a threshold bit sequence. The result of the comparison is a random bit sequence. Over a number of clock cycles, the random bit sequences produced approximate a Poisson distribution. The present invention can be used to evaluate the performance of communications systems by modulo-2 adding these random bit sequences with encoded data words to insert errors into the encoded data words, and then determining how well the communications system decodes and corrects the errors in the encoded data words. The present invention is particularly useful in this environment because the true distribution of errors in encoded data words transmitted over communications links generally is Poisson in nature.
REFERENCES:
patent: 3614399 (1971-10-01), Linz
patent: 6816992 (2004-11-01), Eby
patent: 6859465 (2005-02-01), Colban
Ireland Howard H.
Nichols Jeffery T.
Bernard Christopher L.
Brown Tyler S.
CIENA Corporation
Clements Dougherty
Tu Christine T.
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