Abstract
Considering that modernized GPS L1C signal utilizes random constructed LDPC as the FEC coding scheme, it’s a waste of storage resources because of the irregularity of the parity-check matrix, though owning superb error-control performance. This paper proposed a constructing algorithm for Quasi-Cyclic LDPC code which is suitable for GNSS signal, it avoids the existence of short cycle with the length of 4 in the Tanner graph from the beginning, by limiting the cross-correlation values of sparse sequences. Better performance can be achieved by making the parity-check matrix sparser. Using 802.11n protocol as a reference, parity-check part is double diagonal, which makes the encoding process possible directly with parity-check matrix. Simulation results show this LDPS code performs slightly better than what GPS L1C uses, lower encoding and decoding complexity makes it more suitable for GNSS.
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Yang, Y., Liu, C., Zhang, X. (2013). A Quasi-Cyclic LDPC Code for GNSS Signal. In: Sun, J., Jiao, W., Wu, H., Shi, C. (eds) China Satellite Navigation Conference (CSNC) 2013 Proceedings. Lecture Notes in Electrical Engineering, vol 244. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-37404-3_2
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DOI: https://doi.org/10.1007/978-3-642-37404-3_2
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