Some new LDPC-coded orthogonal modulation schemes for high data rate transmissions in navigation satellite systems

Abstract

In this paper, we design some new LDPC-coded orthogonal modulation (OM) schemes for high data rate transmissions (HDRT) in the navigation satellite systems. We analyze their error-performance utilizing soft-decision bit metrics and compare them with those of L61 and L62 signals in the quasi-zenith satellite system (QZSS) for centimeter-level augmentation services (CLAS). Compare to the L62 signals of QZSS, both schemes have higher data rates (14.6% increase) and essentially the better error performance at high SNR region. At the region where frame error rate (FER) =10−3, one of the proposed schemes has better error performance of 1.4 dB in terms of carrier-to-noise ratio (C/N0).