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Frequency offset insensitive demodulation algorithm for satellite‐based automatic identification system
Author(s) -
Zhou Haosu,
Lu Wenbin,
Lv Zhenbin,
Gu Hui,
Liu Zhenfu
Publication year - 2018
Publication title -
international journal of satellite communications and networking
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.388
H-Index - 39
eISSN - 1542-0981
pISSN - 1542-0973
DOI - 10.1002/sat.1276
Subject(s) - demodulation , computer science , synchronizer , frequency offset , algorithm , cyclic redundancy check , error detection and correction , redundancy (engineering) , doppler effect , bit error rate , network packet , communications satellite , word error rate , real time computing , offset (computer science) , decoding methods , satellite , telecommunications , speech recognition , orthogonal frequency division multiplexing , channel (broadcasting) , computer network , distributed computing , physics , astronomy , engineering , programming language , aerospace engineering , operating system
Summary The frequency offset caused by the Doppler shift and the oscillators instability degrades the performance of satellite‐based demodulators for automatic identification system (AIS) signals unless proper synchronization algorithms are used. A noncoherent demodulation algorithm (NDA) based on cyclic redundancy check (CRC) error correction is proposed in this paper, which is able to tolerate large frequency offsets, thus avoiding the use of an explicit frequency synchronizer. To reduce the complexity, the number of CRC register states for error correction can be limited. Simulation results of the proposed algorithm are presented and compared with other demodulation algorithms in the literature in terms of bit error rate (BER) and packet error rate (PER).