Calculate the Q function values for a real-valued input vector.
x = -4:0.1:4; y = qfunc(x);
Plot the results.
Calculate the QPSK error probability at an setting of 7 dB by using the Q function.
Convert the in dB to its linear equivalent.
ebnodB = 7; ebno = 10^(ebnodB/10);
Using the Q function, calculate the QPSK error probability, .
Pb = qfunc(sqrt(2*ebno))
Pb = 7.7267e-04
Input, specified as a real-valued scalar, matrix, or array.
For a scalar x, the Q function is (1 – f), where f is the result of the cumulative distribution function of the standardized normal random variable. The Q function is defined as
The Q function is related to the complementary error function, erfc, according to