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

Question

Dipsikha Roy 2020-11-28

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/667013-how-can-i-give-randn-function-in-the-argument-of-qammod-comment

回答： Walter Roberson 2020-11-28

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.

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Answer 1

Walter Roberson 2020-11-28

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/667013-how-can-i-give-randn-function-in-the-argument-of-qammod-comment#answer_558833

在 MATLAB Online 中打开

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.