User`s manual
AMBE-3000™-HDK Development Board
User’s Manual Version 1.1
Page 53
DVSI Confidential Proprietary
Section 6 – Appendix
If each of the 16 4-bit soft-decsion bits are denoted as A, B, C, D, E, F, G, H, I, J, K,
and L, then the first eight bytes of the the file could be expressed as hex AB, CD, EF, GH,
IJ, KL, MN, and OP. A through P are each 4-bit soft-decsion bits in the range from 0x0 to 0xF.
If the transmission is not ideal, then the values for each 4-bit soft-decsion bit will vary between
0x0 and 0xF depending upon the confidence of each received bit.
NOTE: Prior to HDK Release 005, the format for soft-decision bit files was different. The soft-
decision bits were not packed. Each 4-bit soft-decision value was stored in one byte. This
wasted space. Using the prior format, if the 16 bits
a, b, c, d, e f, g, h, i, j, k, l, m, n, o, p
are the first 16 bits stored in a hard-decision bit file. Then the first sixteen bytes of the converted
soft-decsion file will be binary
0000aaaa 0000bbbb 0000cccc 0000dddd 0000eeee 0000ffff 0000gggg 0000hhhh
0000iiii 0000jjjj 0000kkkk 0000llll 0000mmmm 0000nnnn 0000oooo 0000pppp
or hex
0A, 0B, 0C, 0D, 0E, 0F, 0G, 0H, 0I, 0J, 0K, 0L, 0N, 0O, 0P.