STTC_simulation.m

% STTC_simulation.m
% To simulate the STTC (Space-Time Trellis Coding) scheme

%MIMO-OFDM Wireless Communications with MATLAB¢ç   Yong Soo Cho, Jaekwon Kim, Won Young Yang and Chung G. Kang
%2010 John Wiley & Sons (Asia) Pte Ltd

clear, clf
N_frame=130; N_Packets=1000; N_Packets=100;  %state='8_State_4PSK';
NT=2;  NR=2;  zf=3;  SNRdBs=5:2:11; %SNRdBs=5:5:11;
for iter=1:4
   if iter==1, state='4_State_4PSK'; gs='-ko';
    elseif iter==2, state='8_State_4PSK'; gs='-ks';
    elseif iter==3, state='16_State_4PSK'; gs='-k+';
    else   state='32_State_4PSK'; gs='-kx';
   end
   [dlt,slt,M] = STTC_stage_modulator(state,NR);
   data_source = data_generator(N_frame,N_Packets,M,zf); 
   data_encoded = trellis_encoder(data_source,dlt,slt);    
   mod_sig = STTC_modulator(data_encoded,M); 
   for i_SNR=1:length(SNRdBs)
      [signal,ch_coefs] = channel1(mod_sig,SNRdBs(i_SNR),NR);
      [data_est,state_est] = STTC_detector(signal,dlt,slt,ch_coefs);
      [N_frame1,space_dim,N_packets] = size(data_est);
      FER(i_SNR) = sum(sum(data_source~=data_est)>0)/N_packets;
   end
   semilogy(SNRdBs,FER,gs), hold on
end
title('BER of STTC coding')