Pseudo-Random Binary Sequence (System Identification Toolkit)
A Pseudo-Random Binary Sequence, also known as Maximal Length Sequence (MLS), is a periodic, deterministic signal with properties similar to white noise. You often generate a pseudo-random binary sequence using an n-bit shift register with feedback through an exclusive or (XOR) function. While appearing random, the sequence actually repeats every 2n–1 values.
When using a whole period, the pseudo-random binary sequence has special mathematical advantages that make it attractive as a stimulus signal. In particular, you can attribute variations in response signals between two periods of the stimulus to noise due to the periodic nature of the signal. Also, like the white random binary noise, the pseudo-random binary sequence has a low crest factor Cf. You can use the SI Generate Pseudo-Random Binary Sequence VI to generate a Pseudo-Random Binary Sequence.
The following figure shows an example of a pseudo-random binary sequence.
