[Tinyos-help] A question about tossim

[zhiqiang zhang]

hi,everyone:


     Recently i have read the manual "TOSSIM: A Simulator for Tinyos
Network" . In section 3.2 about Bit Error and Packet Errors,the original
text i attached below.

*The formula for calculating packet error rates (Ep) from bit error rates
(Eb) for the mica RFM 40Kb stack with SecDed encoding is:*
*Ep = 1 -(Ss · (Se)^d)
Ss = (1 -Eb)^9
Se = (1 -Eb)^8 + (8 · Eb · (1 -Eb)^12)
Ep = 1 -((1 -Eb)^9 · ((1 -Eb)^8 + (8 · Eb · (1 -Eb)12))^d)*
**
**
I have problem about these formulas.

for example ,in the formula 2, why is the exponent 9.

so can anyone give a more detailed material  to understand this formula?

thank you !

zhiqiang form PRC
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