dc_var6

快速傅立叶变换程序代码,学信号的同学,可要注意了

# dc variables
#
# file to be read by commander.p
# each line is turned into a structure entry   	(str)
#     	a default-setting entry			(def)
#     	a usage-printing entry			(usg)
# 	and a command line reading entry	(clr)
# of these, the S, U and C can be disabled by >No S, etc.
# and the D can be disabled by -.
#
# variable    		type deflt flag  short_name extra_action long_name
#
dc->afile		s	- -afile afile	 dc->reada=2;	file with alist in it.
>No CU
dc->reada		d	1 - - -	whether to use default name; 2 = user-defined.
dc->noisy		d	0 - - -	whether a noisy y vector is involved
dc->rate		f	0 - - - rate achieved by this MN system
dc->Rate		f	0 - - - rate achieved by this G system
dc->capacity		f	0 - - - capacity of equivalent channel
dc->rho			f	0 - - - effective value of rho
dc->h2fs		f	0 - - - binary entropy of source
dc->h2fn		f	0 - - - binary entropy of noise
>CU
dc->notabovecap		d	1 -nac 0/1 - whether not to allow communication attempts above capacity. If 1, then such attempts are disallowed.
dc->use_fe              d       0 -fe use_fe            - use fe_min
dc->fe			d	0 -fe fe - whether to use femin?
dc->use_bnd             d       1 -bnd use_bnd          - use bnd
dc->error_log           d       0 -el log               - whether to record decoding errors
dc->error_logfile       s       - -elfile elfile dc->error_log=2; file for errors
dc->noise_sum           d       0 -nsum log    - whether to tot up noise patterns that cause decoding errors
dc->noise_sumfile       s       - -nsumfile nsumfile dc->noise_sum=2; file for noisesums
dc->maxcount            d       5 -maxcount maxcount  - max number of bit errors to report; -1=all
dc->skip		d	0 -skip number		- number of random vectors to generate before starting
# the big picture 
dc->MNC			d	4 -mnc MNC	- which code to use: 1,2,3,4 = MNC 1-4	 if MNC = 0 then an M*N code as in MacKay 1995 is defined. Only mnc=4 supported by mnc6
dc->N		d	20 -n N - length of the unknown original vector s 
dc->M		d	0  -m M - length of the transmitted vector t if not N
dc->trueM	d	0  -truem trueM - actual number of constraints satisfied
dc->trueN	d	0  -truen trueN - actual number of transmitted bits (see CYCLICU)
# new in 2000: (see also dc->ns below)
dc->nsfrom	d	1  -nsfrom nsfrom -  whether index of first state bit is 1(1) or N-ns (0)
#      the medium picture
# new in mnc7  4th nov 95.
dc->gc		d	1	-gc gc - Use Gaussian channel
dc->gcx		f	1.0	-gcx gcx - Signal to noise ratio of gaussian channel
dc->fs		f	0.5  -fs fs - fraction in s
dc->fn		f	0.05 -fn fn - error probability on channel
dc->ns		d	0    -ns ns - if !0, number of signal bits (state bits) in constant weight
dc->nn		d	0    -nn nn - if !0, number of noise bits in constant weight
dc->nsn		d	0    -nsn nsn - if !0, number of signal+noise bits in constant weight
# this was not enabled ^ until 1997 02
# similar feature for Gaussian channel: 
dc->fgcx	f	1.0	-fgcx fgcx dc->fgc=1; fix signal to noise ratio exactly to this by normalizing the noise
dc->fgcnf	f	1.0	-fgcnf fgcnf dc->fgc=1; fixed gaussian channel noise factor (factor by which to scale the noise)
>No CU
dc->NN		d	0	- - - Actual number of transmitted bits (Tue 11/6/02)UGLY!
dc->gcxact	f	1.0	- -  - actual Signal to noise ratio of gaussian channel this time
dc->fgc		d  	0 -fgc fgc - fix fix signal to noise ratio exactly by normalizing the noise
dc->true_fs	f	0 -tfs tfs - actual fraction in s
dc->true_fn	f	0 -tfn tfn - actual error fraction on channel
dc->tr		d	8 -    	-  - typical number in row and column of code
dc->fte		f	0 - 	-  - ?
>CU
dc->tc		d	4 -t t 	-  number per column (useful for automated production of afile name)
dc->verbose	d	0 -dv dv - verbosity
#     the details 
dc->mseed	ld	1234 -mseed mseed - seed for matrices in the code
dc->vseed	ld	9876 -vseed vseed - seed for vectors
#     customer relations
>No CU
dc->message	d	0 - - - which message we are on 
>CU
dc->MESSAGE	d	1 -mess mess - how many messages to send
dc->DEMO	d	0 -demo demo - -
>No CU
dc->failcount	d	0 - - -  number of failed messages 
#
# the following are in gallager.c only, based on RA.c
#
dc->lowweight	d 	100 - - - definition of a low weight error
dc->totloops	d 	0 - - - tot number of loops done in successful transmissions
dc->blocks	d 	0 - - - number of blocks transmitted
dc->block_valid	d	0 - - -  number of blocks reaching valid decoding
dc->block_det	d	0 - - -  number of detected failures
dc->block_undet	d	0 - - -  number of undetected failures
dc->block_detlw	d	0 - - -  number of detected in which error is low weight
dc->bit_errs	d	0 - - -  number of bit errs
dc->bit_undet	d	0 - - -  number of bits in undetected errs
dc->bit_det	d	0 - - -  number of bits in detected errs
dc->bep		f	0 - - -  block error probability
dc->bep_u	f	0 - - -  block error probability
dc->bep_l	f	0 - - -  block error probability
dc->bitep	f	0 - - -  block error probability
dc->bitep_u	f	0 - - -  block error probability
dc->bitep_l	f	0 - - -  block error probability
dc->bep_det	f	0 - - -  block error probability
dc->bep_detlw	f	0 - - -  block error probability
dc->bep_undet	f	0 - - -  block error probability
dc->ebno	f	1.0 - - - eb/no
>CU
dc->zscore	f	1.0 -zscore z - number of sd's to use in error bars
dc->failures	d	5 -failures failures -  number of failed messages to stop after 
>No CU
dc->pheading_count  d	-1	- - - -
>CU
dc->pheading_period d	20	-pheading period - -
dc->big_write_period d	100	-pbw period - how often to write a ton of summary stuff
dc->coset	d	0 -coset coset - whether to decode a second coset code (gallagerS02 only)