Abstract
Time hopping spread spectrum (THSS) system and chaotic system have been studied as candidates of the anti-jamming (AJ) systems with substantial advantages. However, THSS systems suffer from the strict synchronization prerequisite. In order to overcome the shortcomings of the THSS system and utilize the profits of the non-coherent chaotic system, we first propose a novel TH-NRDCSK system to enhance the bit error rate (BER) performance of the conventional non-coherent THSS system and relieve the strict synchronization issue of coherent THSS systems. Then, we analyze the performance of the proposed system under additive white Gaussian noise (AWGN) channel and jamming environment. Finally, we implement the simulation to demonstrate the consistency of the analysis and the simulation results and to disclose the effects of the system parameters on system's AJ performance. Moreover, the performance of the proposed system is compared to that of conventional counterparts to look at the benefits of integrating chaotic and THSS systems. The simulation results show that the proposed system significantly outperforms conventional counterparts in a practical environment.
Highlights
At bit error rate (BER) = 10−2, the proposed time hopping (TH)-NRDCSK system can obtain about 1dB SJR gain as P is doubled
Even though the jamming power is lower as Ns increases, the graph in Fig. 6 shows that the AJ performance of the TH-NRDCSK system is degraded
The AJ performance of the TH-NRDCSK system is improved as Ns decreases and Nh increases
Summary
Electronic warfare (EW) includes attacking an enemy (electronic attack, EA), protecting against enemy attacks (electronic protection, EP), and detecting/intercepting. Time hopping spread spectrum (THSS) technology is considered to be one of the most efficient AJ technologies with its powerful characteristics, such as ultra-wide band (UWB) and low transmit power density and robustness to jamming signals [3]–[6]. This system inherently offers resilience to multipath fading and multiple access capabilities. THSS systems require strict synchronization, which is why their applications are limited in reality To address this issue, non-coherent THSS systems have been proposed in [7], yet its bit error rate (BER) performance are much worse than that of the coherent ones. The simulation results of the proposed TH-NRDCSK system under several conditions, and the conclusions are presented in Section V and VI, respectively
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