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From: birhane Alemayoh on 6 Jan 2010 08:00
Dear all
I am implementing a soft input soft output (SISO) MMSE detector and SISO decoder in an iterative fashion (turbo receiver). A de-interleaver and interleaver is used in between the detector and decoder. I am using a convolution encoder at the transmitter side. Therefore, my decoder is the Log MAP decoder.
I have computed the extrinsic information of the output of the SISO MMSE detector and those will be delivered to the Log MAP decoder.
My question is, how do I calculate the gama parameter for the decoder having the a priori information from the detector.
I know that, in normal Log MAP decoder implemented with just BPSK, the main input to the decoder is the received signal. and the gama parameter (branch metric) may be calculated by computing the correlation of the received signal and all possible coded bits with in the corresponding time intervals.
please help me.
I am waiting your valuable response.
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