MIMOOFDM 极化码 MATLAB

function [transmit_signal training] = add_training（transmit_signalPrefixRatio...
    N_subcN_used Idx_usedcp_len N_Tx_antN_tran_sym）

% 1024点FFT的前导序列
% 多条天线的训练序列（同步帧）各两个OFDM符号
training = zeros（N_subcN_tran_symN_Tx_ant）;
% 产生伪随机序列，放在训练OFDM符号的导频位置.
PN_seq = mseq（10 [1 2 6 10] ones（110） N_Tx_ant*3）;
PN_seq = 2*PN_seq - 1;

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% 产生第1个训练OFDM符号
Repeat = 8; % 为保证在时域上重复Repeat次 在频域上两个有数据的子载波间插（Repeat-1）个零
for ant = 1:N_Tx_ant
    real_part = PN_seq（ （ant-1）*N_Tx_ant + 11:N_used/Repeat ）; % 截取PN序列
    imag_part = PN_seq（ （ant-1）*N_Tx_ant + 21:N_used/Repeat ）;
    
    tran_tmp1 =  sqrt（Repeat/2） * （ real_part + j * imag_part ）;
    tmp1 = [ tran_tmp1 ; zeros（Repeat-1N_used/Repeat） ];
    tmp2 = reshape（tmp1 N_used 1）;
    tmp3 = [ tmp2（1:N_used/2） ; flipud（tmp2（N_used/2 + 1:end））];
    training（Idx_used1ant） = tmp3;
end

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% 产生第2个训练OFDM符号 在偶数的子载波上放伪随机序列

Repeat = 2;
for ant = 1:N_Tx_ant
    tran_tmp1 = PN_seq（ 2*N_Tx_ant + ant1:N_used/Repeat ）; % 截取PN序列    
    tmp1 = [ tran_tmp1 ; zeros（Repeat-1N_used/Repeat） ];
    tmp2 = reshape（tmp1 N_used 1）;
    tmp3 = [ tmp2（1:N_used/2） ; flipud（tmp2（N_used/2 + 1:end））];
    training（Idx_used2ant） = tmp3;
end


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% 产生时域训练序列

syn_frame = sqrt（N_subc） * ifft（ fftshift（ training  1 ） ）;
cp = syn_frame（N_subc - cp_len + 1:N_subc ::）;
training_frame = [cp;syn_frame];
training_frame = reshape（training_frame[1 （N_subc + cp_len）*N_tran_sym N_Tx_ant]）;

transmit_signal = [ training_frame transmit_signal ];