A general structure of trellis-based reduced-state soft-input/soft-output (RS-SISO) algorithms for communication systems based on concatenated finite state machines (FSMs) with large memory is presented. Based on forward and backward reduced-state (RS) recursions, a particular structure for the RS-SISO algorithm can be obtained by setting suitable parameters in the general formulation. Two novel RS-SISO algorithms are proposed based on a bi-directional state reduction paradigm. To assess the performance of the proposed RS-SISO algorithms, numerical simulations are conducted for isolated long intersymbol interference with additive white Gaussian noise (ISI/AWGN) channels and a serially concatenated system given by interleaved trellis coded modulation (TCM) over an ISI/AWGN channel. Simulation results show that low-complexity RS-SISO algorithms can approach the performance of a full-state SISO algorithm. Moreover, one of the novel RS-SISO algorithms is found to be robust in all the considered cases.
Generalized trellis-based reduced-state soft-input/soft-output algorithms / P., Thiennvibon; Ferrari, Gianluigi; K. M., Chugg. - (2002), pp. 1667-1671. ((Intervento presentato al convegno IEEE International Conference on Communications (ICC'02) tenutosi a New York, NY, USA nel May [10.1109/ICC.2002.997132].
Generalized trellis-based reduced-state soft-input/soft-output algorithms
FERRARI, Gianluigi;
2002-01-01
Abstract
A general structure of trellis-based reduced-state soft-input/soft-output (RS-SISO) algorithms for communication systems based on concatenated finite state machines (FSMs) with large memory is presented. Based on forward and backward reduced-state (RS) recursions, a particular structure for the RS-SISO algorithm can be obtained by setting suitable parameters in the general formulation. Two novel RS-SISO algorithms are proposed based on a bi-directional state reduction paradigm. To assess the performance of the proposed RS-SISO algorithms, numerical simulations are conducted for isolated long intersymbol interference with additive white Gaussian noise (ISI/AWGN) channels and a serially concatenated system given by interleaved trellis coded modulation (TCM) over an ISI/AWGN channel. Simulation results show that low-complexity RS-SISO algorithms can approach the performance of a full-state SISO algorithm. Moreover, one of the novel RS-SISO algorithms is found to be robust in all the considered cases.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
