untitled2.m

小区初搜为GSM系统中的一个关键过程

Tb = 3.6920*10^-6;

Lh = 3;

M = 16;     % M>=16 and mod(M,4)==0 

OSR = 4;

Lburst = 148;

Lburst_guard = Lburst+8;%156

TRAINING = [1, 0, 1, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0,...

    1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 0, 0,...

    1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 1, 1];

T_SEQ = T_SEQ_gen(TRAINING);

[ SYMBOLS , PREVIOUS , NEXT , START , STOPS ] = viterbi_init(Lh);

          

N = textread('12.dat','%s'); % [A,B,C,D] = textread('1.dat','%n%s%n%s');

N = ((hex2dec(N)-512)/512).';

 

R = zeros(1,length(N)/2);

R= N(1:2:length(N))*j + N(2:2:length(N));

r = R(1:OSR:length(R));

 

[ peakIndex, qualityMetric, frequencyError ] = FB_detector_corrector(r, Tb, M);   

  

fprintf('\nThe beginning of FB is %d in received sample.\n',(peakIndex-1)*OSR+1);

r = R(peakIndex+5000:peakIndex+5000+599);

 

  % RUN THE MATCHED FILTER, IT IS RESPONSIBLE FOR FILTERING SYNCRONIZATION 

    % AND RETRIEVAL OF THE CHANNEL CHARACTERISTICS.

    [Y, Rhh] = mafi(r,Lh,T_SEQ,OSR);

        

    % HAVING PREPARED THE PRECALCULATABLE PART OF THE VITERBI

    % ALGORITHM, IT IS CALLED PASSING THE OBTAINED INFORMATION ALONG WITH

    % THE RECEIVED SIGNAL, AND THE ESTIMATED AUTOCORRELATION FUNCTION.

    %

    rx_burst = viterbi_detector(SYMBOLS,NEXT,PREVIOUS,START,STOPS,Y,Rhh);

    

    % RUN THE DeMUX

    %

    rx_data=DeMUX(rx_burst);

    

    [rx_block,FLAG_SS,PARITY_CHK] = channel_dec(rx_enc)