ber2snr.m

放大转发协同通信的有关仿真代码

function y = ber2snr(x);
% Calculates the SNR of the channel
%
% The SNR of the channel can be estimated/calculated when the
% BER of the channel is known.
global signal;
switch signal.modulation_type
case 'QPSK'
y = qinv(x) .^ 2;
case 'BPSK'
y = qinv(x) .^ 2 / 2;
otherwise
error(['Modulation-type unknown: ', signal.modulation_type])
end