A study on iterative decoding techniques applied to GSM full-rate channels

In this paper, we discuss applying iterative decoding algorithms (turbo-equalizer) to GSM speech channels. Although the turbo-equalizer under realistic time-variant channel scenarios has a high potential, we only get a minor performance gain when compared to soft-decision algorithms. Certain constraints of the GSM coding scheme prevent better results. In this paper, we discuss the transition from a very simple data transmission model to a full GSM-compatible system and compare the resulting bit-error-rates (BER).