Synchronization Technique Based on Adaptive Combining of Sub-correlations of Multiband Sine Phased BOC Signals

The Journal of Korea Information and Communications Society

2014

In this paper, we design a local signal to improve a tracking performance of time-multiplexed binary offset carrier (TMBOC) signal, which was adopted in modernized global positioning systems (GPS). Specifically, considering that TMBOC signal includes BOC(6,1) components, we first obtain local signal by evenly dividing sub-carrier of TMBOC(6,1,4/33) by the period of a BOC(6,1) pulse. Finally, we remove side-peaks of TMBOC(6,1,4.33) autocorrelation via combination of partial correlations given from designed local signal and solve the ambiguity problem. From numerical results, when performing signal tracking using the designed local signal, we demonstrate that the improved tracking error standard deviation (TESD) performance is offered as compared its autocorrelation and the conventional correlation functions.※ 이 논문은 정부(미래창조과학부)의 재원으로 한국연구재단의 지원(2012R1A2A2A01045887, 2014R1A5A1011478)을 받아 수행된 연구임.

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Local Signal Design for Future GPS Systems

The Journal of Korea Information and Communications Society

2014

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Cancellation of AltBOC Correlation Side-Peaks for Frequency Sharing in Satellite Communication Spectrum

The Journal of Korea Information and Communications Society

2014

Key Words : frequency share, cognitive radio (CR), alternative binary offset carrier (AltBOC), tracking error standard deviation (TESD) ABSTRACTThe alternative binary offset carrier (AltBOC) signal shares frequency spectrum with the phase shift keying (PSK) signal, enabling us to manage the satellite communication spectrum more efficiently. However, the side-peaks in the AltBOC autocorrelation pose an ambiguity in the AltBOC signal tracking, and consequently, makes the frequency sharing via the AltBOC difficult. Therefore, in this paper, we propose a cancellation scheme of the AltBOC correlation side-peaks. From the numerical results, it is confirmed that the proposed scheme removes the ambiguity in signal tracking caused by the side-peaks completely, and thus, has a much lower tracking error standard deviation (TESD) (i.e., a much better tracking performance) than the conventional scheme.

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An Unambiguous Correlation Function of TMBOC Signal for Satellite Communication of Vessels

Lee

The Journal of Korea Information and Communications Society

2014