FSK and MSK mod

Hello, i have a question about fskmod and mskmod, when I tried to use these functions, it can only run when my bipolar bitstream. When I use unipolar, then the code can't compile.

ms = 2*randi([0 1],1000,1) -1;
msk = mskmod(ms,8,[],pi/2);

Answer 1

[Walter Roberson]

 >> help mskmod
 [...] The elements of X must be 0 or 1.

 >> help fskmod
 [...] M is the alphabet size and must be an integer power of 2. The message signal must consist of integers between 0 and M-1.

Your ms is -1 and +1, which is against the requirement that the values must be 0 or 1. Neither function accepts bipolar signals.

[Kanard]

thanks for your answer, then is anyway to create FSK signal for a bipolar signal without using fskmod function?

[Walter Roberson]

Sorry, I do not know.

You can convert the bipolar to unipolar as (ms > 0)