Optimum MBOC Realization, Power Split and Data Rate for Compass B1-C Signal

Z. Zhang, Y. Kou, J. Liu

Abstract:	According to the latest officially published Compass signal and frequency plan, the Compass B1-C signal will adopt the same Multiplexed Binary Offset Carrier (MBOC) modulation PSD (power spectrum density) as the GPS L1C and Galileo E1 open service signals. This will facilitate GNSS interoperability and compatibility, a big concern among today's GNSS community. However, the detailed parameters of the B1-C signal were still under investigation. This paper explores the issues of its MBOC implementations, optimum power sharing between data and pilot channels, data/symbol rate, and ranging code design for the Compass B1-C signal. First, seven different implementations of MBOC(6,1,1/11) are compared in terms of payload signal generation and receiver signal processing complexity. A preferred scheme similar to the GPS L1C signal with TMBOC on pilot channel and BOCS(1,1) on data channel is chosen for the following discussion. Next, the autocorrelations, code tracking noises, and multipath errors are analytically simulated with three optional configurations of the power sharing coefficients. Then, a trade-off between the power split of data/pilot channels and navigation data bit/symbol rate for the B1-C signal is proposed based on extensive simulations of the signal tracking noises and BER performances with different receiver signal tracking and data demodulation strategies. The paper also addresses the issue of ranging code design, including the code length, primary code design, and different locations of BOCs(6,1) symbols in the spreading code sequence. Finally, the preliminary design of the Compass B1-C signal is summarized. Its compatibility with other three OS signals in the same frequency band is simulated. Possible extension of this work is also proposed.
Published in:	Proceedings of the 2011 International Technical Meeting of The Institute of Navigation January 24 - 26, 2011 Catamaran Resort Hotel San Diego, CA
Pages:	1181 - 1190
Cite this article:	Zhang, Z., Kou, Y., Liu, J., "Optimum MBOC Realization, Power Split and Data Rate for Compass B1-C Signal," Proceedings of the 2011 International Technical Meeting of The Institute of Navigation, San Diego, CA, January 2011, pp. 1181-1190.
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