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From: Amin on 17 Jul 2010 13:08
Hi dears

we are working on LDPC error correcting codes . modulation which we used in our channel , is OQPSK . at this way we faced to a problem : LLR ouput doesn't supported in OQPSK demodulation block . so we decided to simulate OQPSK block like "OQPSK Floating Point Signal Flow Diagram" in : " http://www.mathworks.com/access/helpdesk/help/toolbox/commblks/ref/oqpskdemodulatorbaseband.html " and use QPSK block in this diagram which support LLR ouput .
in this diagram one part has ambiguity for us : block which is a circle with plus symbol in it .
at first we assumed that it is " xor block " , and used it in our OQPSK demodulator . but "xor block" doesn't support "double complex" input .
so we used "adder block" in that place . but it results wrong ouput .
have someone any idea for solving this problem ?

thanks a lot about your attention !

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