tx_add_cyclic_prefix.m

MATLAB Simulation of OFDM System

function time_signal = tx_add_cyclic_prefix(time_syms)

num_symbols = size(time_syms, 2)/64; %64个子载波
n_antennas = size(time_syms, 1);
time_signal = zeros(n_antennas, num_symbols*80); %循环前缀的长度为80－64＝16。

for antenna = 1:n_antennas
   symbols = reshape(time_syms(antenna,:), 64, num_symbols);
   tmp_syms = [symbols(49:64,:); symbols];  %添加循环前缀
   time_signal(antenna,:) = tmp_syms(:).';%按列（即一个包含循环前缀的OFDM符合）转换为一维的向量。
end