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A LDPC convolutional code optimization method for FTN systems

Next-generation satellite communication requires high transmission efficiency and high reliability to provide subscribers with various services. To satisfy these requirements, we optimize low-density parity-check convolutional codes (LDPC CC) for faster-than-Nyquist (FTN) systems with good degree distributions, girth profile (GP) as well as good sliding-window girth (SWG). In this paper, we mainly investigate the time-invariant LDPC CC which can be a parent code of a low-density parity-check block code (LDPC BC). A comprehensive set of LDPC CC optimization algorithm for FTN systems is presented and the optimized LDPC CC for FTN system can achieve about 2.9dB gain compared with the LDPC BC from WiMAX standard.