ex-ldpc36-1000a-out

剑桥大学David J.C. MacKay 个人网站公布的2006年的代码

make-ldpc ex-ldpc36-1000a.pchk 1000 2000 1 evenboth 3 no4cycle
Eliminated 24 cycles of length four by moving checks within column
make-gen  ex-ldpc36-1000a.pchk ex-ldpc36-1000a.gen dense
Number of 1s per check in Inv(A) X B is 400.3
rand-src  ex-ldpc36-1000a.src 1 1000x100
encode    ex-ldpc36-1000a.pchk ex-ldpc36-1000a.gen ex-ldpc36-1000a.src \
          ex-ldpc36-1000a.enc
Encoded 100 blocks, source block size 1000, encoded block size 2000

# NOISE STANDARD DEVIATION 0.80, Eb/N0 = 1.94 dB

transmit ex-ldpc36-1000a.enc ex-ldpc36-1000a.rec 1 awgn 0.80
Transmitted 200000 bits
decode   ex-ldpc36-1000a.pchk ex-ldpc36-1000a.rec ex-ldpc36-1000a.dec awgn 0.80\
         prprp 250
Decoded 100 blocks, 100 valid.  Average 10.8 iterations, 11% bit changes
verify   ex-ldpc36-1000a.pchk ex-ldpc36-1000a.dec ex-ldpc36-1000a.gen \
         ex-ldpc36-1000a.src 
Block counts: tot 100, with chk errs 0, with src errs 0, both 0
Bit error rate (on message bits only): 0.000e+00

# NOISE STANDARD DEVIATION 0.85, Eb/N0 = 1.41 dB

transmit ex-ldpc36-1000a.enc ex-ldpc36-1000a.rec 1 awgn 0.85
Transmitted 200000 bits
decode   ex-ldpc36-1000a.pchk ex-ldpc36-1000a.rec ex-ldpc36-1000a.dec awgn 0.85\
         prprp 250
Decoded 100 blocks, 88 valid.  Average 52.2 iterations, 12% bit changes
verify   ex-ldpc36-1000a.pchk ex-ldpc36-1000a.dec ex-ldpc36-1000a.gen \
         ex-ldpc36-1000a.src 
Block counts: tot 100, with chk errs 12, with src errs 12, both 12
Bit error rate (on message bits only): 7.490e-03

# NOISE STANDARD DEVIATION 0.90, Eb/N0 = 0.92 dB

transmit ex-ldpc36-1000a.enc ex-ldpc36-1000a.rec 1 awgn 0.90
Transmitted 200000 bits
decode   ex-ldpc36-1000a.pchk ex-ldpc36-1000a.rec ex-ldpc36-1000a.dec awgn 0.90\
         prprp 250
Decoded 100 blocks, 19 valid.  Average 209.4 iterations, 11% bit changes
verify   ex-ldpc36-1000a.pchk ex-ldpc36-1000a.dec ex-ldpc36-1000a.gen \
         ex-ldpc36-1000a.src 
Block counts: tot 100, with chk errs 81, with src errs 81, both 81
Bit error rate (on message bits only): 6.529e-02

# NOISE STANDARD DEVIATION 0.95, Eb/N0 = 0.45 dB

transmit ex-ldpc36-1000a.enc ex-ldpc36-1000a.rec 1 awgn 0.95
Transmitted 200000 bits
decode   ex-ldpc36-1000a.pchk ex-ldpc36-1000a.rec ex-ldpc36-1000a.dec awgn 0.95\
         prprp 250
Decoded 100 blocks, 1 valid.  Average 248.0 iterations, 9% bit changes
verify   ex-ldpc36-1000a.pchk ex-ldpc36-1000a.dec ex-ldpc36-1000a.gen \
         ex-ldpc36-1000a.src
Block counts: tot 100, with chk errs 99, with src errs 99, both 99
Bit error rate (on message bits only): 1.055e-01