OFDM and FFT

nice post about OFDM .
for FFT,
here and here.

separe

cool extension from firefox.
go and get it from here.

Decibel

dB level	Ratio
−30 dB	1/1000
−20 dB	1/100
−10 dB	1/10
−3 dB	0.5 (approx.)
3 dB	2 (approx.)
10 dB	10
20 dB	100
30 dB	1000

more details can be found here

google file system

here
spread-sheet

Some Netwok processor and hardware

Blackfin processor
NIC card AN983B
AN983B - help
AN983B data-sheet