A Novel Unambiguous CBOC Correlation Function With an Improved Main-Peak

摘要

Conventionally, the design of a correlation function for unambiguous tracking of composite binary offset carrier (CBOC) signals has focused on only the elimination of the side-peaks causing the ambiguity in tracking without considering the loss in height and sharpness of the main-peak during the elimination process, thus resulting in a worse tracking performance compared with that corresponding to the CBOC-autocorrelation function. In this paper, we propose a novel correlation function with no side-peaks and a main-peak that is higher and sharper than those of the conventional correlation functions including the CBOC-autocorrelation function, thus enabling us to have not only unambiguity in tracking but also a better tracking performance over that of the CBOC-autocorrelation function. We first split the CBOC sub-carrier into multiple partial sub-carriers and correlate each of them with the received signal, yielding partial correlations. Then, we combine the partial correlations in a specialized way, where the side-peaks are canceled out and the main-peak becomes higher and sharper than that of the CBOC-autocorrelation function. Finally, the proposed correlation function is shown to have no side-peaks and to provide a better tracking performance than those of the conventional correlation functions including the CBOC-autocorrelation function.