MC-BOC: A New Interoperable Modulation and Performance Analysis for BeiDou B1 Signal

B1/L1/E1 frequency (1575.42 MHz) is one of the main interoperability frequency bands in the Global Navigation Satellite Systems (GNSS). The MBOC (Multiplexed BOC) modulation is adopted on this frequency by GPS and Galileo systems, which is also a candidate for BeiDou B1C signal. This paper starts with the definition of MBOC modulation, and proposes a generalized MBOC modulation, i.e. MC-BOC (Multi Carrier BOC) modulation. The MC-BOC modulation is a multi-carrier modulation, which contains four sub-carriers. Compared with the existing MBOC modulation, the proposal has independent intellectual property right. And it has superiorities in anti-multi-path and tracking, as well as in the flexibility. The study results can be regarded as a choice for the design and optimization of the BeiDou signals.