get_agc_seq.m

OFDM

%
%   subcarrier number is 256, total bandwidth is 4MHz
%   subcarrier bandwidth is 19.54
%   used subcarrier number is 190, the center three subcarriers is left blank
%   used bandwidth is 3.77MHz
%

function [long_pre, seq1, seq2] = get_agc_seq()
pilot_symbol = [1-j, 1-j, -1-j, 1+j, 1-j, 1-j, -1+j, 1-j, 1-j, 1-j, 1+j, -1-j, 1+j, 1+j, -1-j, 1+j, -1-j, -1-j, 1-j, -1+j, 1-j, 1-j, -1-j, 1+j, 1-j, 1-j, -1+j, 1-j, 1-j, 1-j, 1+j, -1-j, 1+j, 1+j, -1-j, 1+j, -1-j, -1-j, 1-j, -1+j, 1-j, 1-j, -1-j, 1+j, 1-j, 1-j, -1+j, 1-j, 1-j, 1-j, 1+j, -1-j, 1+j, 1+j, -1-j, 1+j, -1-j, -1-j, 1-j, -1+j, 1+j, 1+j, 1-j, -1+j, 1+j, 1+j, -1-j, 1+j, 1+j, 1+j, -1+j, 1-j, -1+j, -1+j, 1-j, -1+j, 1-j, 1-j,1+j, -1-j, -1-j, -1-j, -1+j, 1-j, -1-j, -1-j, 1+j, -1-j, -1-j, -1-j, 1-j, -1+j, 1-j, 1-j, -1+j, 1-j, -1+j,-1+j, -1-j, 1+j, -1-j, 1+j, -1+j, -1+j, -1-j, 1+j, 1+j, 1+j, -1-j, 1+j, 1-j, 1-j, 1-j, -1+j, -1+j, -1+j, -1+j, 1-j, -1-j, -1-j, -1+j, 1-j, 1+j, 1+j, -1+j, 1-j, 1-j, 1-j, -1+j, 1-j, -1-j, -1-j, -1-j, 1+j,1+j, 1+j, 1+j, -1-j, -1+j, -1+j, 1+j, -1-j, 1-j, 1-j, 1+j, -1-j, -1-j, -1-j, 1+j, -1-j, -1+j, -1+j, -1+j, 1-j, 1-j, 1-j, 1-j, -1+j, 1+j, 1+j, -1-j, 1+j, -1+j, -1+j, -1-j, 1+j, 1+j, 1+j, -1-j, 1+j, 1-j, 1-j, 1-j, -1+j, -1+j, -1+j, -1+j, 1-j, -1-j, -1-j, 1-j, -1+j, -1-j, -1-j, 1-j, -1+j, -1+j, -1+j, 1-j, -1+j,1+j, 1+j, 1+j, -1-j, -1-j, -1-j, -1-j, 1+j, 1-j, 1-j];
pilot_symbol = pilot_symbol(1:192);

mapped_sym = zeros(1,256);
mapped_sym(3:97) = pilot_symbol(1:95);
mapped_sym(161:255) = pilot_symbol(96:190);
long_pre = ifft(mapped_sym);
long_pre = long_pre/max(max(abs(real(long_pre))),max(abs(imag(long_pre))));

mapped_sym = zeros(1,256);
mapped_sym(5:4:97) = pilot_symbol(4:4:96);
mapped_sym(161:4:255) = pilot_symbol(100:4:192);
short_pre1 = ifft(mapped_sym);
seq1 = short_pre1(1:64);
seq1 = seq1/max(max(abs(real(seq1))),max(abs(imag(seq1))));

fd_symbol = [1 - 1*i,	1 - 1*i,	-1 + 1*i,	1 - 1*i,	1 - 1*i,	1 + 1*i,	1 + 1*i,	1 - 1*i,	-1 + 1*i,	-1 - 1*i,	1 - 1*i,	-1 - 1*i,	-1 + 1*i,	1 + 1*i,	1 - 1*i,	1 - 1*i,	-1 + 1*i,	1 - 1*i,	-1 - 1*i,	-1 - 1*i,	1 + 1*i,	-1 - 1*i,	-1 + 1*i,	-1 - 1*i,	-1 - 1*i,	-1 - 1*i,	1 - 1*i,	-1 - 1*i,	1 - 1*i,	-1 - 1*i,	1 + 1*i,	1 + 1*i,	1 - 1*i,	-1 - 1*i,	1 + 1*i,	-1 - 1*i,	1 + 1*i,	-1 - 1*i,	1 + 1*i,	-1 + 1*i,	-1 + 1*i,	1 + 1*i,	-1 - 1*i,	1 - 1*i,	-1 + 1*i,	1 + 1*i,	-1 - 1*i,	1 + 1*i,	1 - 1*i,	1 - 1*i,	1 - 1*i,	-1 + 1*i,	-1 - 1*i,	-1 - 1*i,	1 - 1*i,	-1 + 1*i,	1 - 1*i,	1 + 1*i,	1 + 1*i,	1 + 1*i,	1 - 1*i,	1 + 1*i,	1 + 1*i,	-1 - 1*i,	1 + 1*i,	1 - 1*i,	-1 + 1*i,	1 + 1*i,	1 + 1*i,	-1 - 1*i,	1 - 1*i,	1 + 1*i,	1 - 1*i,	-1 - 1*i,	1 - 1*i,	-1 - 1*i,	1 - 1*i,	-1 - 1*i,	1 + 1*i,	1 - 1*i,	1 + 1*i,	1 + 1*i,	-1 - 1*i,	-1 - 1*i,	-1 - 1*i,	-1 - 1*i,	-1 + 1*i,	1 + 1*i,	1 + 1*i,	-1 - 1*i,	1 + 1*i,	1 + 1*i,	1 + 1*i,	1 - 1*i,	1 + 1*i,	-1 - 1*i,	1 - 1*i,	1 + 1*i,	1 - 1*i,	-1 + 1*i,	1 + 1*i,	1 - 1*i,	1 - 1*i,	1 + 1*i,	1 - 1*i,	-1 + 1*i,	1 + 1*i,	1 - 1*i,	-1 + 1*i,	-1 + 1*i,	-1 - 1*i,	-1 + 1*i,	-1 - 1*i,	-1 + 1*i,	1 + 1*i,	1 - 1*i,	1 + 1*i,	1 + 1*i,	-1 + 1*i,	-1 - 1*i,	1 - 1*i,	1 - 1*i,	1 - 1*i,	-1 - 1*i,	1 + 1*i,	-1 + 1*i,	1 + 1*i,	-1 - 1*i,	1 - 1*i,	-1 + 1*i,	-1 - 1*i,	1 - 1*i,	1 + 1*i,	1 + 1*i,	-1 + 1*i,	1 - 1*i,	-1 - 1*i,	1 - 1*i,	-1 - 1*i,	-1 + 1*i,	-1 + 1*i,	1 + 1*i,	1 + 1*i,	-1 + 1*i,	-1 - 1*i,	1 + 1*i,	-1 + 1*i,	1 - 1*i,	1 - 1*i,	1 - 1*i,	1 - 1*i,	-1 - 1*i,	-1 - 1*i,	1 - 1*i,	-1 + 1*i,	1 + 1*i,	-1 - 1*i,	1 + 1*i,	1 - 1*i,	1 - 1*i,	-1 - 1*i,	-1 - 1*i,	1 + 1*i,	-1 + 1*i,	-1 + 1*i,	-1 - 1*i,	1 + 1*i,	1 - 1*i,	1 - 1*i,	-1 + 1*i,	1 + 1*i,	-1 - 1*i,	-1 + 1*i,	1 - 1*i,	1 + 1*i,	-1 - 1*i,	-1 + 1*i,	-1 + 1*i,	1 + 1*i,	-1 - 1*i,	-1 + 1*i,	-1 - 1*i,	1 - 1*i,	1 + 1*i,	1 - 1*i,	1 - 1*i,	1 - 1*i,	1 - 1*i,	-1 - 1*i,	-1 + 1*i,	-1 - 1*i,	1 - 1*i];
mapped_sym = zeros(1,256);
mapped_sym(5:4:97) = fd_symbol(2:4:96);
mapped_sym(161:4:255) = fd_symbol(97:4:192);
short_pre2 = ifft(mapped_sym);
seq2 = short_pre2(1:64);
seq2 = seq2/max(max(abs(real(seq2))),max(abs(imag(seq2))));