Dual-Sideband Constant-Envelope Frequency-Hopping Binary Offset Carrier Multiplexing Modulation for Satellite Navigation

Abstract

Frequency-hopping binary offset carrier modulation improves the anti-interference performance and mitigates the autocorrelation function (ACF) ambiguity problem of binary offset carrier modulation. To save payload resources and make high-power amplifiers on satellites operate at the nonlinear saturation region, there is further demand for finding an efficient constant-envelope frequency-hopping binary offset carrier multiplexing technique to combine several signal components. Thus, we propose a dual-sideband constant-envelope multiplexing modulation, named asymmetric constant-envelope frequency-hopping binary offset carrier multiplexing (ACE-FHBOC), which is also a multicarrier constant-envelope multiplexing modulation. ACE-FHBOC provides higher design flexibility in the number of subcarrier frequencies than ACE-BOC while maintaining the same flexibility of signal design as ACE-BOC in the number of signal components and power ratio among components. We first establish the theory and give implementation methods of ACE-FHBOC. Then, we develop a software-defined receiver to simulate and analyze the performance for several specific ACE-FHBOC and ACE-BOC signals. The results show that the recommended ACE-FHBOC signals have lower ACF ambiguity, better anti-narrowband interference, and multipath performance than ACE-BOC under the same conditions. With these advantages, ACE-FHBOC is a promising solution for the signal design of new generation global navigation satellite systems.

A Channel Compensation Technique Based on Frequency-Hopping Binary Offset Carrier Modulated Signal

“…Based on BOC modulation as an extend from original spread spectrum modulation offering better performance in measurement, reference [22] proposed a combination with the introduction of a frequency-hopping technique as frequency-hopping binary offset carrier (FH-BOC) modulation to strengthen anti-interference capability, where multipath interference has also been discussed as outperforming the binary phase shift keying (BPSK) signal and BOC signal in circumstances. Subsequently, reference [23] conducted a FH-BOC signal further, converting it into an efficient constant envelope multiplexing technique for easily integrating signal components, in which the results showed it possessing lower ambiguity and better multipath performance than other BOC signals designed in a constant envelope under the same conditions. Additionally, reference [24] proposed a frequency-hopping alternated BOC (AltBOC) that inherits the low probability of interception, referring to another kind of variant BOC modulation, along with considerable anti-narrowband interference.…”