Pseudo-random bit streams
A PRBS (Pseudo-Random Bit Sequence) is a binary waveform
with a sequence that is almost impossible to predict.
PRBS waveforms are used within secure communications
A PRBS is generated by a linear-feedback shift register
with taps that generate a feedback signal via an
exclusive-OR gate. The number of stages determines the
sequence length (2N-1) whilst the clock frequency
determines the bit rate. The stage length can be set to
7, 9, 11, 15, 20, or 23, resulting in sequence lengths
from 127 to 8,388,607 bits at rates between 1µbps to
50Mbps (1µbps to 25Mbps on the TG251xA).
The PRBS waveform can be used as both a carrier and a