AMP dual-turbo iterative detection and decoding for LDPC coded multibeam MSC uplink

The uplink of mobile satellite communication (MSC) system with hundreds of spot beams is essentially a multiple-input multiple-output (MIMO) channel. Dual-turbo iterative detection and decoding as a kind of MIMO receiver, which exchanges soft extrinsic information between a soft-in soft-out (SISO) detector and an SISO decoder in an iterative fashion, is an efficient method to reduce the uplink inter-beam-interference (IBI), and so the receiving bit error rate (BER). We propose to replace the linear SISO detector of traditional dual-turbo iterative detection and decoding with the AMP detector for the low-density parity-check (LDPC) coded multibeam MSC uplink. This improvement can reduce the computational complexity and achieve much lower BER.