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| n |
3
versions: 2 radio (typ. 2.4 GHz), 1 IR
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– |
data
rates 1 or 2 Mbit/s
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| n |
FHSS
(Frequency Hopping Spread Spectrum)
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– |
spreading,
despreading, signal strength, typ. 1 Mbit/s
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min.
2.5 frequency hops/s (USA), two-level GFSK modulation
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| n |
DSSS
(Direct Sequence Spread Spectrum)
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– |
DBPSK
modulation for 1 Mbit/s (Differential Binary Phase Shift
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Keying),
DQPSK for 2 Mbit/s (Differential Quadrature PSK)
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preamble
and header of a frame is always transmitted with 1 Mbit/s,
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rest
of transmission 1 or 2 Mbit/s
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– |
chipping
sequence: +1, -1, +1, +1, -1, +1, +1, +1, -1, -1, -1 (Barker
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code)
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max.
radiated power 1 W (USA), 100 mW (EU), min. 1mW
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| n |
Infrared
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850-950
nm, diffuse light, typ. 10 m range
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– |
carrier
detection, energy detection, synchonization
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