Viterbi Decoding Sample program

Hi,

You need to see memory contents and compare input and output values. Those are same but order is reversed.

Regards,

Hyun

 can you tell me what is the relation between the values for given terms below.

frame_word_sz  =  12.

metric_sz            =   32.

frame_bit_sz      =   189.

How do we get those values and whats the relation between them

thanks habeeb

hi,

189 : information €€€bits

12 : ceil(189/16)€€

32 : k€€€€€ 5 

regards,

hyun

Kim thanks, but i still dont understand some part of it becoz  the font doesnt show up i think.

i am going to put down what i understood, please tell me if i am right about it.

32 = 2 ^(k-1), where k = 5

12 = frame size in word = 189/16 = 11.81 = 12

how do we decide on the frame size to be 189

and am i correct on how we got the metric update number.

thanks Habeeb

hi,

16=2^(k-1),  when k=5, 16x(old+new)=32

12= ok

you can pick any frame size. This example showed 189 which is one of modem protocol.

Regards,

Hyun

Hyun,

I changed the numbers as such

 frame_word_sz     32
 frame_bit_sz         512
 metric_sz               32

I am getting numbers which do not match the input given.

Do we have to follow certain protocol when giving the size for frame_bit_sz or is it becoz in the SPRA 776A the numbers of butterflies written have been defined for 189 bits only so on increasing the the frame_bit_sz  we also need to write more butterflies.

Thanks, Habeeb

sorry forgot the screen shot here

attached is the screen shot

thanks Hyun, do we have the viterbi decoder in c - code wher i can try to make changes and work with it

Hi,

No, but you can google it. There are C Viterbi examples available. 

Regards,

Hyun

Hyun,

if i want to make it work for more then 189 bits in asm, can you tell me wher can i start to make the changes, orare the more documents available which can help me understand to work more changes in the code

habeeb

Hi,

That is the only documents on that assembly code. You need to go through and understand it first.

After that, you can modify it. I know it's not simple.

Regards,

Hyun