preamble_s_siso_20.m

A SISO 20M OFDM system based on IEEE802.11n standard, using Matlab.

%Short Preamble Generator:Programmed by Yoshiki Kami
function r_e=preamble_s_siso_20();

%僾儕傾儞僽儖傪IFFT偺input弴偵暲傋懼偊傞(s_a)
%    0 1                                                               26
s_a=[0,0,0,0,-1-j,0,0,0,-1-j,0,0,0,1+j,0,0,0,1+j,0,0,0,1+j,0,0,0,1+j,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1+j,0,0,0,-1-j,0,0,0,1+j,0,0,0,-1-j,0,0,0,-1-j,0,0,0,1+j,0,0,0];
delta_f = 3.2*10^(-6);
N_st = 52;

%OFDM僔儞儃儖偺暯嬒揹椡偱normalize
s=s_a*sqrt(7/3);

%IFFT偟偰帪宯楍偵偡傞
r_j = ifft(s);
% t = [1 : 8*10^(-6)/160 : 8*10^(-6)];

%嵟弶偺16僒儞僾儖傪10夞孞傝曉偟偰160僒儞僾儖(+1)傪嶌傞
r_c = [];
for ia = 1:10
    r_c = [r_c r_j(1,1:16)];
end
r_k = r_c;

%window_function
r_e = [r_k(1,1)*0.5 r_k(1,2:159) r_k(1,160)*0.5];