need MATLAB m-file on Generate pseudo-random binary sequence

prbs generator matlab

mlbs

Generate maximum length binary sequence (pseudo-random binary sequence).

Syntax

bitseries = mlbs(log2N)
[bitseries,nextstnum] = mlbs(log2N,bitno,startnum)

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Is there a Pseudo-Random Binary Sequence (PRBS) generator in MATLAB?

There is a PRBS generating M-file in the new Frequency Domain System Identification Toolbox, for lengths 2^2-1 to 2^30-1. Its name is mlbs (for Maximum Length Binary Sequence). Also, the idinput function in the System Identification Toolbox (version 4.0) contains a PRBS generator.

generate m sequence

you can try LFSR, the diagram and its C code can be found in

https://en.wikipedia.org/wiki/Linear_feedback_shift_register

mlbs matlab

This is the Linear Feedback shift register implemented directly out of Skolnik's Intro to Radar Systems

clear

%Bit length of the shiftRegister
shiftRegLength = 7;

%Start value of the shiftReg
shiftReg = round(rand(1,shiftRegLength));

%Generate output

%Note that this only has length 2^n-1 before it starts repeating
for i = 1:2^shiftRegLength-1

%Pull the output of the register (the last bit)
outputSeq(i)= shiftReg(shiftRegLength);

%Feedback (modulo 2) as implemented on pg 351 of Skolnik
c = xor(shiftReg(shiftRegLength),shiftReg(shiftRegLength-1));

%Insert that value in the beginning and shift the rest to the right
shiftReg = [c shiftReg(1:shiftRegLength-1)];
end

%Check to see how uncorrelated the output is.
plot(xcorr(outputSeq,outputSeq))