Iterative decoding of GMSK modulated convolutional code with multiple differential detection

A novel receiver architecture for the serial concatenation system of a conv olutional code and a Gaussian minimum shift keying (GMSK) modulator is prop osed. A maximum a pasteriori probability algorithm for the multiple differe ntial detection (MDD) of GMSK signals, which accepts a priori information a nd provides a soft-output for the subsequent convolutional decoder, is deri ved. The soft-output of the decoder is fed back to the MDD receiver for fur ther improvement thus resulting in an iterative decoding structure.