end\r
\r
\r
-function sim_out = run_sim(HRA, Ntrials, Esvec, genie_Es, packet_size, golay = 0)\r
+function sim_out = run_sim(sim_in, HRA, Ntrials)\r
\r
- if golay\r
+ genie_Es = sim_in.genie_Es;\r
+ packet_size = sim_in.packet_size;\r
+ code = sim_in.code;\r
+ hf_en = sim_in.hf_en;\r
+ diversity = sim_in.diversity;\r
+ Esvec = sim_in.Esvec;\r
+\r
+ if strcmp(code, 'golay')\r
rate = 0.5;\r
code_param.data_bits_per_frame = 12;\r
framesize = 24;\r
- else\r
- % LDPC code\r
-\r
+ end\r
+ if strcmp(code, 'ldpc')\r
[Nr Nc] = size(HRA); \r
rate = (Nc-Nr)/Nc;\r
framesize = Nc;\r
code_param.P_matrix = [];\r
code_param.data_bits_per_frame = length(code_param.H_cols) - length( code_param.P_matrix ); \r
end\r
+ if strcmp(code, 'diversity')\r
+ rate = 0.5;\r
+ code_param.data_bits_per_frame = 7;\r
+ framesize = 14;\r
+ end\r
\r
mod_order = 2; \r
bps = code_param.bits_per_symbol = log2(mod_order);\r
\r
+ % init HF model\r
+\r
+ if hf_en\r
+\r
+ % some typical values\r
+\r
+ Rs = 50; dopplerSpreadHz = 1.0; path_delay = 1E-3*Rs;\r
+\r
+ nsymb = Ntrials*framesize*bps;\r
+ spread1 = doppler_spread(dopplerSpreadHz, Rs, nsymb);\r
+ spread2 = doppler_spread(dopplerSpreadHz, Rs, nsymb);\r
+ hf_gain = 1.0/sqrt(var(spread1)+var(spread2));\r
+ % printf("nsymb: %d lspread1: %d\n", nsymb, length(spread1));\r
+ end\r
+\r
% loop around each Esvec point\r
\r
for ne = 1:length(Esvec)\r
\r
Terrs = 0; Tbits = 0; Ferrs = 0; \r
tx_bits = rx_bits = [];\r
+ hfi = 1;\r
\r
for nn = 1: Ntrials \r
data = round( rand( 1, code_param.data_bits_per_frame ) );\r
tx_bits = [tx_bits data];\r
- if golay\r
+ if strcmp(code, 'golay')\r
codeword = egolayenc(data);\r
- else\r
+ end\r
+ if strcmp(code, 'ldpc')\r
codeword = LdpcEncode( data, code_param.H_rows, code_param.P_matrix );\r
end\r
+ if strcmp(code, 'diversity')\r
+ codeword = [data data];\r
+ end\r
+\r
code_param.code_bits_per_frame = length( codeword );\r
Nsymb = code_param.code_bits_per_frame/bps; \r
\r
% modulate\r
+\r
s = 1 - 2 * codeword; \r
code_param.symbols_per_frame = length( s );\r
\r
+ if hf_en\r
+\r
+ % simplified rate Rs simulation model that doesn't include\r
+ % ISI, just freq filtering. We assume perfect phase estimation\r
+ % so it's just amplitude distortion.\r
+\r
+ for i=1:length(s)\r
+\r
+ % 1.5*Rs carrier spacing, symbols mapped to 14 carriers\r
+ % OK we'd probably use QPSK in practice but meh a few approximations....\r
+\r
+ w = 1.5*mod(i,14)*2*pi; \r
+ hf_model(i) = hf_gain*(spread1(hfi) + exp(-j*w*path_delay)*spread2(hfi));\r
+ s(i) *= abs(hf_model(i));\r
+ hfi++;\r
+ end\r
+ end\r
+\r
variance = 1/(2*EsNo);\r
noise = sqrt(variance)* randn(1,code_param.symbols_per_frame); \r
r = s + noise;\r
\r
Nr = length(r); \r
\r
- if golay\r
+ if strcmp(code, 'golay')\r
detected_data = egolaydec(r < 0);\r
detected_data = detected_data(code_param.data_bits_per_frame+1:framesize);\r
- else\r
+ end\r
+\r
+ if strcmp(code, 'ldpc')\r
\r
% in the binary case the LLRs are just a scaled version of the rx samples ...\r
% if the EsNo is known -- use the following \r
detected_data = detected_data(1:code_param.data_bits_per_frame);\r
end\r
\r
+ if strcmp(code, 'diversity')\r
+ detected_data = (r(1:7) + r(8:14)) < 0;\r
+ end\r
+\r
rx_bits = [rx_bits detected_data];\r
\r
error_positions = xor( detected_data, data );\r
% one big string of bits lets us account for cases were FEC framesize\r
% is less than packet size\r
\r
+ error_positions = xor(tx_bits, rx_bits);\r
Perrs = 0; Tpackets = 0;\r
for i=1:packet_size:length(tx_bits)-packet_size\r
- error_positions = xor( tx_bits(i:i+packet_size-1), rx_bits(i:i+packet_size-1));\r
- Nerrs = sum(error_positions);\r
+ Nerrs = sum(error_positions(i:i+packet_size-1));\r
if Nerrs>0, Perrs = Perrs +1; end\r
Tpackets++;\r
end\r
sim_out.FERvec = FERvec;\r
sim_out.TERvec = TERvec;\r
sim_out.framesize = framesize;\r
+ sim_out.error_positions = error_positions;\r
+ end\r
+endfunction\r
+\r
+\r
+function plot_curves(hf_en)\r
+\r
+ Ntrials = 500;\r
+\r
+ sim_in.genie_Es = 1;\r
+ sim_in.packet_size = 28;\r
+ sim_in.code = 'ldpc';\r
+ sim_in.hf_en = hf_en;\r
+ sim_in.diversity = 0;\r
+\r
+ if hf_en\r
+ Esvec = -3:0.5:6; \r
+ else\r
+ Esvec = 0:0.5:6; \r
+ end\r
+ sim_in.Esvec = Esvec;\r
+\r
+ load HRA_112_112.txt\r
+ load HRA_112_56.txt\r
+ load HRA_56_56.txt\r
+ load HRA_56_28.txt\r
+\r
+ sim_out1 = run_sim(sim_in, HRA_112_112, Ntrials);\r
+ sim_out2 = run_sim(sim_in, HRA_112_56 , Ntrials);\r
+ sim_out3 = run_sim(sim_in, HRA_56_56 , Ntrials*2);\r
+ sim_out4 = run_sim(sim_in, HRA_56_28 , Ntrials*2);\r
+ sim_in.code = 'golay';\r
+ sim_out5 = run_sim(sim_in, [], Ntrials*10);\r
+ sim_in.code = 'diversity';\r
+ sim_out6 = run_sim(sim_in, [], Ntrials*10);\r
+\r
+ if hf_en\r
+ Ebvec_theory = 0.5:9;\r
+ EbNoLin = 10.^(Ebvec_theory/10);\r
+ uncoded_BER_theory = 0.5.*(1-sqrt(EbNoLin./(EbNoLin+1)));\r
+ else\r
+ Ebvec_theory = -2:0.5:6;\r
+ uncoded_BER_theory = 0.5*erfc(sqrt(10.^(Ebvec_theory/10)));\r
end\r
+\r
+ % need standard packet size to compare\r
+ % packet error if bit 0, or bit 1, or bit 2 .....\r
+ % or bit 0 and bit 1\r
+ % no packet error if all bits ok (1-p(0))*(1-p(1))\r
+ % P(packet error) = p(0)+p(1)+....\r
+\r
+ uncoded_PER_theory = 1 - (1-uncoded_BER_theory).^sim_in.packet_size;\r
+\r
+ figure(1); clf;\r
+ semilogy(Ebvec_theory, uncoded_BER_theory, 'b+-;BPSK theory;','markersize', 10, 'linewidth', 2)\r
+ hold on;\r
+ semilogy(sim_out1.Ebvec, sim_out1.BERvec, 'g+-;rate 1/2 HRA 112 112;','markersize', 10, 'linewidth', 2)\r
+ semilogy(sim_out2.Ebvec, sim_out2.BERvec, 'r+-;rate 2/3 HRA 112 56;','markersize', 10, 'linewidth', 2)\r
+ semilogy(sim_out3.Ebvec, sim_out3.BERvec, 'c+-;rate 1/2 HRA 56 56;','markersize', 10, 'linewidth', 2)\r
+ semilogy(sim_out4.Ebvec, sim_out4.BERvec, 'k+-;rate 2/3 HRA 56 28;','markersize', 10, 'linewidth', 2)\r
+ semilogy(sim_out5.Ebvec, sim_out5.BERvec, 'm+-;rate 1/2 Golay (24,12);','markersize', 10, 'linewidth', 2)\r
+ semilogy(sim_out6.Ebvec, sim_out6.BERvec, 'bo-;rate 1/2 Diversity;','markersize', 10, 'linewidth', 2)\r
+ hold off;\r
+ xlabel('Eb/No')\r
+ ylabel('BER')\r
+ grid\r
+ legend("boxoff");\r
+\r
+ figure(2); clf;\r
+ semilogy(Ebvec_theory, uncoded_PER_theory, 'b+-;BPSK theory;','markersize', 10, 'linewidth', 2)\r
+ hold on;\r
+ semilogy(sim_out1.Ebvec, sim_out1.PERvec, 'g+-;rate 1/2 HRA 112 112;','markersize', 10, 'linewidth', 2)\r
+ semilogy(sim_out2.Ebvec, sim_out2.PERvec, 'r+-;rate 2/3 HRA 112 56;','markersize', 10, 'linewidth', 2)\r
+ semilogy(sim_out3.Ebvec, sim_out3.PERvec, 'c+-;rate 1/2 HRA 56 56;','markersize', 10, 'linewidth', 2)\r
+ semilogy(sim_out4.Ebvec, sim_out4.PERvec, 'k+-;rate 2/3 HRA 56 28;','markersize', 10, 'linewidth', 2)\r
+ semilogy(sim_out5.Ebvec, sim_out5.PERvec, 'm+-;rate 1/2 Golay (24,12);','markersize', 10, 'linewidth', 2)\r
+ semilogy(sim_out6.Ebvec, sim_out6.PERvec, 'bo-;rate 1/2 Diversity;','markersize', 10, 'linewidth', 2)\r
+ hold off;\r
+ xlabel('Eb/No')\r
+ ylabel('PER')\r
+ grid\r
+ legend("boxoff");\r
endfunction\r
\r
% Start simulation here ----------------------------------------------\r
format;\r
init_cml;\r
\r
-Ntrials = 500;\r
-Esvec = -3:0.5:3; \r
-packet_size = 28;\r
-\r
-\r
-load HRA_112_112.txt\r
-load HRA_112_56.txt\r
-load HRA_56_56.txt\r
-load HRA_56_28.txt\r
-\r
-sim_out1 = run_sim(HRA_112_112, Ntrials, Esvec, 1, packet_size);\r
-sim_out2 = run_sim(HRA_112_56 , Ntrials, Esvec, 1, packet_size);\r
-sim_out3 = run_sim(HRA_56_56 , Ntrials*2, Esvec, 1, packet_size);\r
-sim_out4 = run_sim(HRA_56_28 , Ntrials*2, Esvec, 1, packet_size);\r
-sim_out5 = run_sim([], Ntrials*10, Esvec, 1, packet_size, 1);\r
-\r
-Ebvec_theory = -2:0.5:6;\r
-uncoded_BER_theory = 0.5*erfc(sqrt(10.^(Ebvec_theory/10)));\r
-\r
-% need standard packet size to compare\r
-% packet error if bit 0, or bit 1, or bit 2 .....\r
-% or bit 0 and bit 1\r
-% no packet error if all bits ok (1-p(0))*(1-p(1))\r
-% P(packet error) = p(0)+p(1)+....\r
-\r
-uncoded_PER_theory = 1 - (1-uncoded_BER_theory).^packet_size;\r
-\r
-figure(1); clf;\r
-semilogy(Ebvec_theory, uncoded_BER_theory, 'b+-;BPSK theory;','markersize', 10, 'linewidth', 2)\r
-hold on;\r
-semilogy(sim_out1.Ebvec, sim_out1.BERvec, 'g+-;rate 1/2 HRA 112 112;','markersize', 10, 'linewidth', 2)\r
-semilogy(sim_out2.Ebvec, sim_out2.BERvec, 'r+-;rate 2/3 HRA 112 56;','markersize', 10, 'linewidth', 2)\r
-semilogy(sim_out3.Ebvec, sim_out3.BERvec, 'c+-;rate 1/2 HRA 56 56;','markersize', 10, 'linewidth', 2)\r
-semilogy(sim_out4.Ebvec, sim_out4.BERvec, 'k+-;rate 2/3 HRA 56 28;','markersize', 10, 'linewidth', 2)\r
-semilogy(sim_out5.Ebvec, sim_out5.BERvec, 'm+-;rate 1/2 Golay (24,12);','markersize', 10, 'linewidth', 2)\r
-hold off;\r
-xlabel('Eb/No')\r
-ylabel('BER')\r
-grid\r
-legend("boxoff");\r
-\r
-\r
-figure(2); clf;\r
-semilogy(Ebvec_theory, uncoded_PER_theory, 'b+-;BPSK theory;','markersize', 10, 'linewidth', 2)\r
-hold on;\r
-semilogy(sim_out1.Ebvec, sim_out1.PERvec, 'g+-;rate 1/2 HRA 112 112;','markersize', 10, 'linewidth', 2)\r
-semilogy(sim_out2.Ebvec, sim_out2.PERvec, 'r+-;rate 2/3 HRA 112 56;','markersize', 10, 'linewidth', 2)\r
-semilogy(sim_out3.Ebvec, sim_out3.PERvec, 'c+-;rate 1/2 HRA 56 56;','markersize', 10, 'linewidth', 2)\r
-semilogy(sim_out4.Ebvec, sim_out4.PERvec, 'k+-;rate 2/3 HRA 56 28;','markersize', 10, 'linewidth', 2)\r
-semilogy(sim_out5.Ebvec, sim_out5.PERvec, 'm+-;rate 1/2 Golay (24,12);','markersize', 10, 'linewidth', 2)\r
-hold off;\r
-xlabel('Eb/No')\r
-ylabel('PER')\r
-grid\r
-legend("boxoff");\r
-\r
+plot_curves('hf');\r
\r
\r
projects / freetel-svn-tracking.git / commitdiff