Application of turbo principle to product codes [articol]

Abstract

In this paper we introduce the iterative decoding principle, “the turbo principle”, for the bidimensional Turbo Product Codes (TPC’s). The constituent codes used for encoding on rows and columns are two concatenated (7,4) Hamming block codes. Several Soft Input Soft Output (SISO) algorithms can be used for the iterative decoding process. At each iteration, the two decoders decode all rows, then all columns. For particular SISO algorithms, Maximum A Posteriori (MAP) algorithm and Soft Output Viterbi Algorithm (SOVA), the system is simulated and performances, in terms of Bit Error Rate (BER), are evaluated for an AWGN channel with BPSK modulation.