interencode.m

用于WCDMA的交织编解码部分

%第一次交织
function [interOutput] = interEncode(Input)
X= length(Input);
%N=每40ms对应比特数
N = 40;
%n=X/N; %n取值为1，2，4，8
n = N / 10;
C=n;
R=X/C;
matrix = zeros(R,C);
index = 1;
flag = 0;
X=R*C;

%逐行写入形成矩阵
for i = 1:R
    for j = 1:C
        matrix(i,j) = Input(index);
        index = index + 1;
        if (index > X)
            flag = 1;
            break;
        end
    end
    if (flag == 1)
        break;
    end
end

%列间交换
PATTERN_1 = [0];
PATTERN_2 = [0,1];
PATTERN_3 = [0,2,1,3];
PATTERN_4 = [0,4,2,6,1,5,3,7];
Pattern = [];
if (n==1)
    Pattern = PATTERN_1;
else
    if (n==2)
        Pattern = PATTERN_2;
    else
        if (n==4)
            Pattern = PATTERN_3;
        else
           Pattern = PATTERN_4;
        end
    end
end

%perform inter-column permutation
tempMatrix =[];
for j = 1:length(Pattern)
    tempMatrix(:, j) = matrix(:,Pattern(j)+1 );
end
matrix = tempMatrix;


%交织完成后信息输出
index = 1;
for i = 1:C 
    for j = 1:R
            interOutput(index) = matrix(j, i);        
            index = index + 1;
    end
end