qfunc

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James
James 2011-10-10
回答： Eslam Omari 2024-5-20
I can not get the qfucn to work in my student version of matlab 2007 I keep getting this error "Undefined function or method 'qfunc' for input arguments of type 'double'. can any one help?

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回答（3 个）

Jan
Jan 2011-10-10
Have you installed this function? Is the parent folder included in the path? See pathtool and addpath.
Walter Roberson
Walter Roberson 2011-10-10
The routine did exist in R2007a; it is part of the Communications Toolbox; see http://www.mathworks.com/help/releases/R2007a/toolbox/comm/ug/qfunc.html. The Communications Toolbox is not, however, one of the toolboxes that is included with the Student Version, and must be purchased as an add-on. (I don't know whether it is still possible to get the student version of that toolbox for the R2007a release.)
Eslam Omari
Eslam Omari 2024-5-20
M_values = [1, 2, 4, 8]; average_SNR = 10;
for M = M_values
gamma_z = linspace(5, 220, 1000);
P_e = 2 *
qfunc(sqrt(2 * gamma_z *
sin(pi/8) / M));
plot(gamma_z, P_e);
hold on;
end
xlabel('Average Branch SNR (dB)'); ylabel('P_e'); title('Probability of Error for 8-PSK with MRC'); legend(arrayfun(@(M) sprintf('M=%d', M), M_values, 'UniformOutput', false)); grid on;
hold off;

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