Chaotic spread spectrum secure communication system based on quadrature amplitude modulation

• Main Authors: XI XIAOHU, LIN LANG, ZENG RAN, HU MIAO, TANG XIANGHONG, LI QILIANG
• Format: Patent
• Language: Chinese; English
• Published: 20.08.2021
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

According to a chaotic spread spectrum safety communication system based on quadrature amplitude modulation, a reflector is connected with a chaotic laser, and the chaotic laser drives a second chaotic laser and a third chaotic laser to enter a synchronous state; a transmitting end converts the optical chaotic signal into an electric signal, the electric signal is divided into two paths to be multiplied by two multipliers respectively, the two paths are multiplied by signals cos (omega t) and sin (omega t) respectively by the two multipliers, the two signals are added, and after a continuous laser generates continuous light waves, the signals are modulated to the light waves generated by the continuous laser by a phase modulator; a receiving end utilizes a Mach-Zehnder interferometer to convert the light wave signal into intensity modulation, divides the light signal into two paths, respectively passes through a third photoelectric detector and a fourth photoelectric detector, and respectively multiplies the