传真(Fax)编程

开发平台：

Matlab

channel_coding.m：源码内容

							
function coded_user_bit = channel_coding( user_bit,ChCodingMethod,Dec_alg,L_total,Generator,Puncture,...
            N_iter,RateChCoding,Alpha,Turbo_frame,N_Turbo_frame,UserRS_Coding ,UserTrellis,...
            TraceBackLen,turn_on )
        
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% 根据不同用户的信道编码参数,进行信道编码
% 输入: user_bit, 用户比特
%       UserRS_Coding, 每个用户的RS码参数
%       UserTrellis,每个用户的卷积码trellis 结构体
%       TraceBackLen, 卷积码译码深度
%       turn_on, 是否打开此功能
% 输出: coded_user_bit, 已编码的用户比特
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
if turn_on
    %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    % 使用Turbo码 + 交织 
    if ChCodingMethod == 1
        % 先假设单用户情况
        bits = user_bit{1}';
        turbo_coded = zeros( 1,L_total/RateChCoding * N_Turbo_frame);
        
        for n = 1:N_Turbo_frame
            bit_frame = bits( (n-1)*Turbo_frame + 1:n*Turbo_frame );
            en_output = encoderm( bit_frame, Generator, Alpha, Puncture ); 
            turbo_coded(1, (n-1)*L_total/RateChCoding + 1:n*L_total/RateChCoding ) = en_output ;
        end
        
        coded_user_bit{1} = turbo_coded' ;
        
        
        %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    % 使用卷积 + RS + 交织    
    elseif ChCodingMethod == 2
        N_user = size( UserRS_Coding ,2);
        for u = 1:N_user
            user_rscode{u} = rsenco(user_bit{u} ,UserRS_Coding(1,u),UserRS_Coding(2,u));
            user_rscode2{u} = [ user_rscode{u} ; zeros( TraceBackLen , 1)];
            user_convcode{u} = convenc(user_rscode2{u},UserTrellis(u));
            
        end   
        coded_user_bit = user_convcode;
    end
    
else
    coded_user_bit = user_bit;
end

						