how can i give randn function in the argument of qammod comment

clear all
clc
close  
M =8;                          
no_of_data_points = 128;
data_source=  randn(1,4,'single');
stem(data_source); grid on; xlabel('Data Points'); ylabel('transmitted data phase representation')
title('Transmitted Data "O"')
qam_modulated_data = qammod(data_source, M);
scatterplot(qam_modulated_data);title('MODULATED TRANSMITTED DATA');

Error in qammod (line 95)

validateInput(x, M, bitInput, outputDataType);

Error in s (line 9)

qam_modulated_data = qammod(data_source, M);

how to solve this?I want to give randn as the argument of qammod function.

Answer 1

[Walter Roberson]

data_source =  abs(round(randn(1,4,'single')));

Note that most of the time the result will be 0 or 1's, because more than 68% of randn() will fall within +/- 1

qammod only accepts non-negative integers.

I would suggest to you that if you want to use a random integer distribution that is not uniformly distributed, that you consider using a poisson distribution.