www.gusucode.com > 基于VBLAST-OFDM的MATLAB SIMULATION，图形化界面，并且给出了各仿真图 > 基于VBLAST-OFDM的MATLAB SIMULATION，图形化界面，并且给出了各仿真图/vblast-ofdm simulation/tx_add_cyclic_prefix.m

    function time_signal = tx_add_cyclic_prefix(time_syms,SimulationParameters)

num_symbols = size(time_syms, 2)/SimulationParameters.FFTPoints;
n_antennas = size(time_syms, 1);
time_signal = zeros(n_antennas, num_symbols*(16+SimulationParameters.FFTPoints));

% Add cyclic prefix for each antenna's signal
for antenna = 1:n_antennas
   symbols = reshape(time_syms(antenna,:), SimulationParameters.FFTPoints, num_symbols);
   tmp_syms = [symbols((SimulationParameters.FFTPoints-15):SimulationParameters.FFTPoints,:); symbols]; 
   time_signal(antenna,:) = tmp_syms(:).';
end