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SOVA for QPSK symbols.

Started by Karthik Iyer September 17, 2005
Hi All,
I am new member of this group and I need a method to compute the soft decisions using SOVA for QPSK symbols. I am using a rate 1/2 systematic convolutional  code with following trellis structure:
 
trellis = poly2trellis ( 3, [5 7], 5 );
 
Please suggest me a way to compute the soft values for the code bits.
 
Thanks in advance,
Karthik Iyer.