a) Optical
transceivers require only simple baseband analog and digital circuitry;
no modulators, active bandpass filters or demodulators are needed.
b) The
short wavelength of visible or near-infrared light (of the order of 1
micron) makes it possible for a millimeter-scale device to emit a narrow
beam (i.e., high antenna gain can be achieved).
c) A
base-station transceiver (BTS) equipped with a compact imaging receiver
can decode the simultaneous transmissions from a large number of dust
motes at different locations within the receiver field of view, which is
a form of space-division multiplexing.
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