iterative demodulation and decoding of multi-level turbo or ldpc (low - density parity - check) encoded modulationssignalen

摘要

IPHD (Iterative Parallel Hybrid Decoding) of various MLC (Multi-Level Code) signals. Various embodiments are provided by which IPHD may be performed on MLC LDPC (Multi-Level Code Low Density Parity Check) coded modulation signals mapped using a plurality of mappings. This IPHD may also be performed on MLC LDPC coded modulation signals mapped using only a single mapping as well. In addition, various embodiments are provided by which IPHD may be performed on ML TC (Multi-Level Turbo Code) signals. Based on the degree of the MLC signal, a corresponding number of parallel paths operate in cooperation to decode the various levels of the MLC signal.The bit metrics are updated during the LDPC or turbo decoding process in order to obtain a sub-optimal solution of a joint demodulation/demapping and decoding.