gmc_8psk_tc20.m

B3g_phase2_C语言_Matlab程序及说明

                    Tmp_s=reshape((Walsh*reshape(x,Code_channel,Symbol_number_slot))',1,SlotData_length).*PN;                  % spread spectrum modulation and interleving
                    %                Tmp_s=reshape((Walsh*reshape(x,Code_channel,Symbol_number_slot)),1,SlotData_length).*PN;                  % spread spectrum modulation without interleving
                    
                    Index_s=0;                                                                                                 % Insert pilot and gaurd 
                    for kk=1:Subslot_number
                        tmp=Tmp_s(Index_s+(1:SubslotData_length));
                        tmp=[Gaurd_Pilot tmp]; 
                        s=[s tmp];
                        Index_s=Index_s+SubslotData_length;
                    end
                    s=[s Gaurd_Pilot];
                    sb(nc,:)=s;              
                end
                
                % Transmiter:Combine subcarrier baseband signals into multicarrier baseband signal
                st=mc_sfb(sb,Slot_length,prototype_filter,Carrier_number,SubCarrier_first,SubCarrier_last,Sampling_factor,Filter_length);
                
                % Channel
                Signal_length=Sampling_factor*(Slot_length-1)+Filter_length+delay(Path_number_mc);                                 % Length of multicarrier baseband signal 
                
                for p=1:Path_number_mc
                    ss(p,:)=[zeros(1,delay(p)) st zeros(1,delay(Path_number_mc)-delay(p))];                            
                end
                
                for na=1:Antenna_number
                    CH_Data = MultiCHannel(Path_Gain,Fc,V,Tc,Signal_length,Time_Begin,Phase(na,:));
                    %                     CH_Data(1,:)=1;
                    %                     CH_Data(2:end,:)=0;
                    Sm(na,:)=sum(ss.*CH_Data);                                                     % The transmitted signal is passed through multipath channel 
                end 
                
                
                
                Time_Begin = Time_Begin+Signal_length; 
                
                %    Add Gauss noise
                Rm=awgn(Sm,SNR);%-10*log10(Spread_factor/Code_channel)-10*log10(Sampling_factor/Carrier_number_used),'measured');
                
                %                  Rm=Sm;
                %                 
                %                                  SNR_tmp=10*log10(sum(sum(abs(Rm.^2)))/sum(sum(abs((Rm-Sm).^2))))
                % 
                %                 plot(20*log10(abs(fft(Sm(1,:)))))
                %                 pause
                
                %    Receiver
                %    Receiver:Separate the received mulicarrier signal into subcarrier signals
                for na=1:Antenna_number
                    %                     rs(na,:,:)=mc_afb(Rm(na,:),Slot_length,prototype_filter,Carrier_number,SubCarrier_first,SubCarrier_last,Sampling_factor,Oversampling_factor,Filter_length);
                    tmp=mc_afb(Rm(na,:),Slot_length,prototype_filter,Carrier_number,SubCarrier_first,SubCarrier_last,Sampling_factor,Oversampling_factor,Filter_length);
                    rs(na,:,:)=SC_sync(tmp,Slot_length,Subslot_length,Subslot_number,Gaurd_Pilot1,Interp_factor,rcflt,Path_number);             
                end 
                %    pause
                %    Receiver: Process each subcarrier separately
                
                for nc=1:Carrier_number_used
                    R=reshape(rs(:,nc,:),Antenna_number,length(rs(:,nc,:))); 
                    
                    %                      plot(20*log10(abs(fft(tmp))))
                    
                    %                     R=SC_sync(tmp,Slot_length, Subslot_length,Subslot_number,Gaurd_Pilot,Interp_factor,rcflt,Path_number);
                    
                    %    Receiver: Channel estimation 
                    Index_R=Gaurd_length;Fades=zeros(Antenna_number,Path_number*(Subslot_number+1));Index_Fades=0;
                    for kk=1:Subslot_number+1
                        Tmp_RP=R(:,Index_R+(1:Pilot_length));
                        Tmp_Fades=Tmp_RP*Pilot_matrix'/Pilot_length;
                        Fades(:,Index_Fades+(1:Path_number))=Tmp_Fades;
                        Index_R=Index_R+Subslot_length;
                        Index_Fades=Index_Fades+Path_number;
                    end
                    
                    for p=1:Path_number
                        tmp_Fades=Fades(:,p:Path_number:end);
                        for na=1:Antenna_number
                            %tmp_FadesP(na,:)=interp(tmp_Fades(na,:),2);
                            [Coefficients,Structure]=polyfit(0:Subslot_number,tmp_Fades(na,:),2);
                            [tmp_FadesP(na,:),delta]=polyval(Coefficients,0:0.5:Subslot_number,Structure);
                            %tmp_FadesP(na,:)=spline(0:Subslot_number,tmp_Fades(na,:),0:Subslot_number);
                        end
                        Fades(:,p:Path_number:length(Fades))=tmp_FadesP(:,1:2:end);
                        FadesI(:,p:Path_number:length(Fades)-Path_number)=tmp_FadesP(:,2:2:end);
                    end
                    
                    Index_R=Gaurd_length;Index_Fades=0;
                    for kk=1:Subslot_number+1
                        Tmp_Fades=Fades(:,Index_Fades+(1:Path_number));
                        Tmp_Noise = R(:,Index_R+(1:Pilot_length))-Tmp_Fades(:,1:Path_number)*Pilot_matrix;
                        Nv(kk)=sum(sum(abs(Tmp_Noise.*Tmp_Noise)))/Pilot_length/Antenna_number;                                    % Estimate of noise variance 
                        Index_R=Index_R+Subslot_length;
                        Index_Fades=Index_Fades+Path_number;
                    end
                    Tmp_Nv=sum(Nv)/(Subslot_number+1);
                    %        Tmn_Nv=0;
                    %    Receiver: Equalization in DFT domain
                    Index_R=Pilot_length; Index_Fades=0;R_EQ=[];
                    for kk=1:Subslot_number
                        Tmp_Fades=(FadesI(:,Index_Fades+(1:Path_number)));%+Fades(:,Index_Fades+Path_number+(1:Path_number)))/2;
                        %Tmp_Nv=(Noise_variance(kk)+Noise_variance(kk+1))/2;
                        
                        RM=R(:,Index_R+(1:Subslot_length)); 
                        R_DFT=fft(conj(RM)');
                        H_DFT=fft(conj([Tmp_Fades zeros(Antenna_number,Subslot_length-Path_number)])');
                        Tmp_R_EQ=conj(ifft(sum(R_DFT.*conj(H_DFT),2)./(sum(H_DFT.*conj(H_DFT),2)+Tmp_Nv)))';
                        R_EQ=[R_EQ Tmp_R_EQ(Gaurd_length+(1:SubslotData_length))];
                        Index_Fades=Index_Fades+Path_number;
                        Index_R=Index_R+Subslot_length;
                    end
                    RR=reshape(Walsh'*reshape(R_EQ.*conj(PN),Symbol_number_slot,Spread_factor)',1,SlotData_length);           % with interleaving  
                    
                    %RR=RR/sqrt(sum(abs(RR).^2)/length(RR));
                    
                    %RR=reshape(Walsh'*reshape(R_EQ.*conj(PN),Spread_factor,Symbol_number_slot),1,SlotData_length);             % without interleaving
                    
                    %Dem_signal(nc,sn*code_SlotL+(1:code_SlotL))=reshape([real(RR);imag(RR)],1,code_SlotL);      
                    
                    %               aa=sign(reshape([sqrt(10)*real(RR); sqrt(10)*abs(real(RR))-2;sqrt(10)*imag(RR); sqrt(10)*abs(imag(RR))-2],1,code_SlotL));
                    
                    %               x=Map_16QAM(bi2de(vec2mat(aa,4),'left-msb')'+1);
                    

                        Temp=real(Map_8PSK'*RR);
                   
                        Dem_signal(nc,sn*code_SlotL+(1:3:code_SlotL))=(max(Temp([1 3 5 7],:))-max(Temp([2 4 6 8],:)));
                        Dem_signal(nc,sn*code_SlotL+(2:3:code_SlotL))=(max(Temp([1 2 5 6],:))-max(Temp([3 4 7 8],:)));
                        Dem_signal(nc,sn*code_SlotL+(3:3:code_SlotL))=(max(Temp([1 2 3 4],:))-max(Temp([5 6 7 8],:)));
                        
                        %  Dem_signal(nc,sn*code_SlotL+(1:code_SlotL))=reshape([sqrt(10)*real(RR); sqrt(10)*abs(real(RR))-2;sqrt(10)*imag(RR); sqrt(10)*abs(imag(RR))-2],1,code_SlotL);
                        
                        
                        % Es = 1;
                        %  Dem_signal(nc,sn*code_SlotL+(1:code_SlotL)) = -get_llr(  RR , Es);
                        
                        
                        
                        % [Dem_signal(nc,sn*code_SlotL+(1:code_SlotL))] = -SoftDeMod(RR, 4);
                        
                    end   
                end
                
                Dem_signal(:,int_table)=Dem_signal;        %reshape(reshape(Dem_signal(nc,:),code_L/Intl_length,Intl_length)',1,code_L);  
                Dem_signal_p=vec2mat(reshape(Dem_signal',1,code_L*packet_N),packet_N)';
                
                
                for np=1:packet_N
                    %   [x,qcode]=quantiz(sqrt(2)*DeQpsk_signal(nc,:),[-.75 -.5 -.25 0 .25 .5 .75],[7,6,5,4,3,2,1,0]); 
                    %   decoded=vitdec(qcode,trel,tblen,'cont','soft',3);
                    
                    %                  decoded=vitdec(-Dem_signal(nc,:),trel,tblen,'cont','unquant');
                    %                 errors=errors+sum(abs(decoded(InputN*tblen+1:end)-msg(nc,1:msg_L)));
                    
                    [decoded] = TuDecSova(-Dem_signal_p(np,:), puncture, nIter, int_table0, 1, 1, poly_g1, poly_g2);
                    errors=errors+sum(abs(decoded(1:msg_L)-msg(np,1:msg_L)));
                    
                end
                errors
                ber(log2(Antenna_number)+1,SNR-SNR1+1)=errors/k/msg_L/packet_N;
                ber(log2(Antenna_number)+1,1:SNR-SNR1+1)
                
                if (errors>50 & k>10) 
                    break;
                end
            end
            
            if ber(log2(Antenna_number)+1,SNR-SNR1+1)<1.0*10^(-6)
                break;
            end
            
        end 
        save ber_16QAM200v_1 ber
    end
    semilogy(SNR1:SNR2,ber(:,1:SNR2-SNR1+1)')
    grid
    xlabel('SNR of Received Signal(in dB)')
    ylabel('Bit Error Rate')
    pause(0.2)
    save ber_16QAM200v_1 ber