On Dec 4, 2006, at 3:31 AM, Rafael Marin Perez wrote:
Hi all,
I have saw a method for calculating bit error rates (BER) from
packet error
rates (PER) for the CC1000 radio in Mica RFM with SecDed encoding.
This isn't for the CC1000, which is part of the mica2 platform. It's
for the mica platform, which had an RFM TR1000 radio. The CC1000 is a
byte-level radio, while the TR1000 is a bit-level radio.
But I need a method for calculating bit error rates(BER) from
packet error
rates (PER) for the CC2420 radio in MicaZ or Telos with O-QPSK
encoding.
Or Forward Error Correction (FEC).
This becomes difficult because of hoe the CC2420 encodes/decodes
packets. The 802.15.4 standard uses a 32:4 DSSS chip-to-bit encoding.
Because the CC2420 uses soft chip decision, there's no real concept
of a "bit error." Instead, it effectively calculates the closeness of
each chip to 0 and 1 and then chooses the symbol sequence which is
closest to the soft chip decisions.
Phil
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