As a new type of modern modulation technology, much attention has been attached to binary offset carrier (BOC) modulation due to its characteristics of band sharing and spectrum separation for military and civilian signals. Basically, it is essential to investigate BOC modulation with jamming to defend various types of jamming which guarantee the safety and reliability of the satellite navigation system. In this paper, the transmitter and receiver of BOC modulation is given, and we propose a mathematical model for BOC modulation and demodulation. In addition, the error probability is derived for BOC modulation with jamming in AWGN channel. Furthermore, the mathematical analysis is verified by simulation results for non-jamming situations. In jamming cases, the single-tone jamming and the multi-tone jamming are considered.
KEYWORDS: Demodulation, Binary data, Frequency shift keying, Bandpass filters, Transceivers, Modulation, Signal to noise ratio, Linear filtering, Signal processing, Receivers
Compared with the superheterodyne transceivers, zero-intermediate frequency (IF) transceivers have simpler structure and lower power consumption. Moreover, communication signals can be processed digitally with a sampling rate equaling to the signal bandwidth before transmission or reception. Binary frequency shift keying (2FSK), as a type of binary single-carrier modulation with excellent anti-interference performance, can also be transmitted or received via a zero-IF structure. Therefore, broadband or frequency hopping 2FSK transceivers can be realized easily in baseband. The traditional zero-IF 2FSK signal demodulation-phase demodulation has a simple structure, but its anti-noise performance is poor due to the unused priori information. In this paper, both coherent and non-coherent demodulation schemes are proposed for zero-IF 2FSK. Mathematical derivations and numerical simulation results show the bit error rate (BER) performance of coherent demodulation of zero-IF 2FSK is 3dB better than that of bandpass 2FSK.
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