ex-wrong-model

剑桥大学David J.C. MacKay 个人网站公布的2006年的代码

#!/bin/sh

# These tests investigate what happens when the wrong model is used for
# decoding.  A (1800,1000) LDPC code with 3 check per bit is used.
# Testing is done by transmitting random messages.  Decoding is done using 
# a maximum of 100 iterations of probability propagation.
#
# The first set of tests compares decoding of messages sent through an 
# AWGN channel using the correct AWGN model with sigma=0.90 to decoding 
# using AWGN models with incorrect values for sigma and to decoding 
# using AWLN models with varying width parameters for the logistic noise
# distribution.  
#
# A second set of tests compares decoding of messages sent through an
# AWLN channel using the correct AWLN model with width=0.50 to decoding
# using AWLN models with incorrect values for width and to decoding 
# using AWGN models with varying sigma parameters.

set -e  # Stop if an error occurs
set -v  # Echo commands as they are read

make-ldpc ex-wrong-model.pchk 1000 1800 1 evenboth 3 no4cycle
make-gen  ex-wrong-model.pchk ex-wrong-model.gen dense
rand-src  ex-wrong-model.src 1 800x1000
encode    ex-wrong-model.pchk ex-wrong-model.gen ex-wrong-model.src \
          ex-wrong-model.enc

# FIRST SET OF TESTS, TRANSMITTING THROUGH AWGN CHANNEL WITH SIGMA=0.90

transmit  ex-wrong-model.enc ex-wrong-model.rec 1 awgn 0.90

# DECODING WITH CORRECT AWGN NOISE MODEL, SIGMA=0.90

decode    ex-wrong-model.pchk ex-wrong-model.rec - awgn 0.90 prprp 100 \
 | verify ex-wrong-model.pchk - ex-wrong-model.gen ex-wrong-model.src 

# DECODING WITH AWGN NOISE MODEL, SIGMA=0.95

decode    ex-wrong-model.pchk ex-wrong-model.rec - awgn 0.95 prprp 100 \
 | verify ex-wrong-model.pchk - ex-wrong-model.gen ex-wrong-model.src 

# DECODING WITH AWGN NOISE MODEL, SIGMA=0.85

decode    ex-wrong-model.pchk ex-wrong-model.rec - awgn 0.85 prprp 100 \
 | verify ex-wrong-model.pchk - ex-wrong-model.gen ex-wrong-model.src 

# DECODING WITH AWLN NOISE MODEL, WIDTH=0.40

decode    ex-wrong-model.pchk ex-wrong-model.rec - awln 0.40 prprp 100 \
 | verify ex-wrong-model.pchk - ex-wrong-model.gen ex-wrong-model.src 

# DECODING WITH AWLN NOISE MODEL, WIDTH=0.45

decode    ex-wrong-model.pchk ex-wrong-model.rec - awln 0.45 prprp 100 \
 | verify ex-wrong-model.pchk - ex-wrong-model.gen ex-wrong-model.src 

# DECODING WITH AWLN NOISE MODEL, WIDTH=0.50

decode    ex-wrong-model.pchk ex-wrong-model.rec - awln 0.50 prprp 100 \
 | verify ex-wrong-model.pchk - ex-wrong-model.gen ex-wrong-model.src 

# DECODING WITH AWLN NOISE MODEL, WIDTH=0.55

decode    ex-wrong-model.pchk ex-wrong-model.rec - awln 0.55 prprp 100 \
 | verify ex-wrong-model.pchk - ex-wrong-model.gen ex-wrong-model.src 

# DECODING WITH AWLN NOISE MODEL, WIDTH=0.60

decode    ex-wrong-model.pchk ex-wrong-model.rec - awln 0.60 prprp 100 \
 | verify ex-wrong-model.pchk - ex-wrong-model.gen ex-wrong-model.src 

# DECODING WITH AWLN NOISE MODEL, WIDTH=0.65

decode    ex-wrong-model.pchk ex-wrong-model.rec - awln 0.65 prprp 100 \
 | verify ex-wrong-model.pchk - ex-wrong-model.gen ex-wrong-model.src 

# SECOND SET OF TESTS, TRANSMITTING THROUGH AWLN CHANNEL WITH WIDTH=0.50

transmit  ex-wrong-model.enc ex-wrong-model.rec 1 awln 0.50

# DECODING WITH CORRECT AWLN NOISE MODEL, WIDTH=0.50

decode    ex-wrong-model.pchk ex-wrong-model.rec - awln 0.50 prprp 100 \
 | verify ex-wrong-model.pchk - ex-wrong-model.gen ex-wrong-model.src 

# DECODING WITH AWLN NOISE MODEL, WIDTH=0.55

decode    ex-wrong-model.pchk ex-wrong-model.rec - awln 0.55 prprp 100 \
 | verify ex-wrong-model.pchk - ex-wrong-model.gen ex-wrong-model.src 

# DECODING WITH AWLN NOISE MODEL, WIDTH=0.45

decode    ex-wrong-model.pchk ex-wrong-model.rec - awln 0.45 prprp 100 \
 | verify ex-wrong-model.pchk - ex-wrong-model.gen ex-wrong-model.src 

# DECODING WITH AWGN NOISE MODEL, SIGMA=0.80

decode    ex-wrong-model.pchk ex-wrong-model.rec - awgn 0.80 prprp 100 \
 | verify ex-wrong-model.pchk - ex-wrong-model.gen ex-wrong-model.src 

# DECODING WITH AWGN NOISE MODEL, SIGMA=0.85

decode    ex-wrong-model.pchk ex-wrong-model.rec - awgn 0.85 prprp 100 \
 | verify ex-wrong-model.pchk - ex-wrong-model.gen ex-wrong-model.src 

# DECODING WITH AWGN NOISE MODEL, SIGMA=0.90

decode    ex-wrong-model.pchk ex-wrong-model.rec - awgn 0.90 prprp 100 \
 | verify ex-wrong-model.pchk - ex-wrong-model.gen ex-wrong-model.src 

# DECODING WITH AWGN NOISE MODEL, SIGMA=0.95

decode    ex-wrong-model.pchk ex-wrong-model.rec - awgn 0.95 prprp 100 \
 | verify ex-wrong-model.pchk - ex-wrong-model.gen ex-wrong-model.src 

# DECODING WITH AWGN NOISE MODEL, SIGMA=1.00

decode    ex-wrong-model.pchk ex-wrong-model.rec - awgn 1.00 prprp 100 \
 | verify ex-wrong-model.pchk - ex-wrong-model.gen ex-wrong-model.src 

# DECODING WITH AWGN NOISE MODEL, SIGMA=1.05

decode    ex-wrong-model.pchk ex-wrong-model.rec - awgn 1.05 prprp 100 \
 | verify ex-wrong-model.pchk - ex-wrong-model.gen ex-wrong-model.src