fft_cp_rx_blk.m

汪裕民的OFDM关键技术与应用中仿真MIMO-OFDM的源代码

function rec_symbol = fft_cp_rx_blk(ofdm_symbol,num_subc,guard_interval);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%------------------------------
% FFT和去除循环前缀
%------------------------------
%   输入：
%       ofdm_symbol     接收来自信道的OFDM符号
%       num_subc        子载波数
%       guard_interval  保护间隔
%   输出：
%       rec_symbol      移除循环前缀和经过FFT的接收信号在频域的形式
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

if(guard_interval>length(ofdm_symbol))
    error('The guard interval is greater than the ofdm symbol duration');
end

% The guard symbol(cyclic prefix) is removed from the ofdm symbol
rec_time_symbol = ofdm_symbol(guard_interval+1:end);

% The FFT of the time domain signal after the removal of cyclic prefix
rec_symbol = fft(rec_time_symbol,num_subc);