userseq_gen2.m

运用群操作进行多用户检测

function [user_seq max_corr] = userseq_gen2(user_num)
N = 31;
goldseq = zeros(33,31);
for i = 1:33,
    goldseq(i,:) = goldseq_gen1(i);
    goldseqbal(i) = sum(goldseq(i,:)*2-1);
end
goldseq_index = find(goldseqbal == 1);
goldseq_length = length(goldseq_index);

% 任意取Nu个
Nu = user_num;
for i=1:Nu
    user_seq(i,:) = goldseq(i,[i+1:N 1:i]);
end
max_c = 0;
for i = 1:Nu,
    for j = i+1:Nu,
        a = 2*user_seq(i,:)-1;
        b = 2*user_seq(j,:)-1;
        for p = 1:N,
            c = [a(1+p:N) a(1:p)];
            v(p) = c*b';
        end
        if (max(v)>max_c)
            max_c = max(v);
        end
    end
end
max_corr = max_c;