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Coherent Side-Band BOC Processing

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Binary Offset Carrier (BOC) modulated signals are characterized by multi-peaked correlation functions which may lead to false peak locks tBinary offset carrier (BOC) modulated signals are characterised by multi-peaked correlation functions which may lead to false peak locks that occur when a secondary correlation lobe is tracked instead of the main peak. To solve this problem, side-band processing (SBP) operates on the two main lobes of the BOC spectrum separately, in a binary phase shift keying like fashion. Although an unambiguous correlation function is obtained, the information provided by the BOC subcarrier is lost. This information is preserved by the double estimator and by the double phase estimator (DPE) which adopt an additional tracking loop to process the subcarrier component. In this study, the connection between SBP and independent subcarrier processing is shown and a novel SBP scheme, the coherent side-band (CSB) approach, is proposed. As in standard SBP, the two main lobes of the BOC spectrum are processed separately and upper and lower correlators are computed. These correlators are then combined to recover the subcarrier information. CSB provides subcarrier measurements and achieves the performance of the DPE. CSB tracking is thoroughly characterised and simulations and real-data processing are used to support theoretical findings. The CSB approach is an effective alternative to independent subcarrier processing.
2016-11-22
INST ENGINEERING TECHNOLOGY-IET
JRC101815
1751-8784,   
http://ieeexplore.ieee.org/document/8038294/,    https://publications.jrc.ec.europa.eu/repository/handle/JRC101815,   
10.1049/iet-rsn.2016.0245,   
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