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function [ signal, signal_i, signal_q ] = load_grcomplex(filename)
% LOAD_GRCOMPLEX Read a complex signal from a binary file containing
% complex float samples saved using GNU Radio.
%
% The data in the file is assumed to be little-endian.
%
%
% [SIGNAL, SIGNAL_I, SIGNAL_Q] = load_grcomplex(FILENAME)
%
% FILENAME is the source filename.
%
% SIGNAL is a complex signal with the real and imaginary components
% within the range [-1.0, 1.0].
%
% SIGNAL_I and SIGNAL_Q are optional return values which contain the
% real and imaginary components of SIGNAL as separate vectors.
%
[f, err_msg] = fopen(filename, 'r', 'ieee-le');
if f ~= -1
data = fread(f, Inf, 'float');
signal_i = data(1:2:end-1, :);
signal_q = data(2:2:end, :);
signal = signal_i + 1j .* signal_q;
fclose(f);
else
error(err_msg)
end
end
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