Abstract
Space laser optical communication has been widely investigated to achieve high bit rate information transmission. To enhance the information transmission security in space laser optical communication, chaos-based encryption scheme is adopted. It involves many parameters in designing a space chaotic optical communication system, which a proper tuning of them brings good communication performance. To investigate the key design parameters including the masking efficiency, transmitting optical power and mismatch coefficient, we give the calculation model of the bit error ratio (BER) based on traditional space laser optical communication system from the perspective of the authorized receiver and eavesdropper. Numerical results indicate that the BER for the eavesdropper is sensitive to the masking efficiency but not to the transmitting optical power. By contrast, the transmitting optical power plays a crucial role in the computational formula of the BER for the authorized receiver. A saturate optical power is also proposed at last which helps save the energy. These simulation results can be reference for practical system design.
Highlights
Space laser optical communication has the advantages of large capacity and good confidentiality compared with traditional space microwave communication
The phenomenon above can be explained through the signal to noise ratio (SNR), shown as below, where the numerator is the output electrical signal of at photo diode 3 (APD3) corresponding to the information signal, the first two terms in the denominator is the detector noise and the latter is chaos noise
The bit error ratio (BER) model for both the eavesdropper and the authorized receiver were given and the simulation based on them shows that the BER for the eavesdropper is sensitive to the masking efficiency but not to the transmitting optical power
Summary
Space laser optical communication has the advantages of large capacity and good confidentiality compared with traditional space microwave communication. The chaos-based encryption scheme was induced to enhance the transmission security in space laser optical communication. Rulkov report the results of an experimental analysis of the atmospheric turbulence in the channel and impact of the atmospheric turbulence on the bit-error-rate performance of chaos-based communication system [22]. A prediction algorithm of the key design parameters including the masking efficiency, the transmitting optical power and mismatch coefficient for space chaotic optical communication system has been given through the quantitative analysis. These works will be applicable for field experiment
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