header_crc_code.asv

小区初搜为GSM系统中的一个关键过程

function [tx_fir] = header_crc_code(tx_block);

% tx_block = round(rand(1,193));
g = [1,0,1,0,0,1,0,0,1]; %有意思的现象，数据超过193，crc就全是0了
d = [tx_block zeros(1,8)];

[q,r] = deconv(d,g);
L = length(r);
out = abs(r(L-7:L));
for n = 1:length(out),
  if ceil(out(n)/2) ~= floor(out(n)/2)
    out(n) = 1;
  else
    out(n) = 0;
  end
end

tx_fir = [tx_block out];
u(1:6) = out(3:8);