Encyclopedia of sparse graph codes: Key to ascii files

Files created by the programs 'gallager' and 'RA'

 First, here are the column headings: 

#blks es un det valid Eb/No(dB)  x    xass   K    N biters undet det block_ep   
  u     l      bit_ep   u     l      blep_det   undet   bldetlw blep totlps lmax
 undetu undetl 

 Now here are the meanings of these columns: 

	#blks   number of block transmissions simulated
	es      number of block errors (total)
	un      number of block errors that were "undetected" errors
	det	number of block errors that were "detected" errors, also known as erasures
	valid	number of decodings that ended in a valid state corresponding to a codeword
	Eb/No(dB)   when computing this I use the "apparent rate" of the code K/N,
	                  which may be smaller than the true rate, since there may be
		          redundancy in the parity check matrix.
	x           signal to noise ratio
	xass        snr assumed by the decoder
	K
	N
	biters	total number of bit errors in all those blocks
	undet   how many of the bit errors were in undetected blocks
	det	how many of the bit errors were in detected blocks
	block_ep  maximum likelihood estimate of block error prob
	u        ] error bars on this estimate
	l	 ]
	bit_ep     estimate of bit error prob
	u        ] error bars on this estimate
	l	 ]
	blep_det   estimate of detected block error probability
	undet      estimate of undetected block error probability
	bldetlw     (ignore this)
	blep        (and this)
	totlps     total number of iterations used to decode the valid blocks
	lmax      can't remember what this is
	undetu ] error bars on undetected block error probability
	undetl ]                            

 A typical use of this file would be as follows: 
   to plot the total block error rate with error bars:

 plot "a/273.82.3.353" u 6:14:15:16 t "" w error 1 2\
	,"a/273.82.3.353" u 6:14 t "total" w linesp 1 2

   to plot the detected block error rate and undetected error rate with error bars: 
 plot "a/273.82.3.353" u 6:20 t "detected" w linesp 2 6\
	,"a/273.82.3.353" u 6:21 t "undetected" w linesp 3 3 \
	,"a/273.82.3.353" u 6:21:26:27 t "" w error 3 3