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提出了一个新的全双工光载无线通信链路模型。方案的下行链路采用两个马赫曾德尔调制器级联以产生六倍频毫米波;采用单边带调制,有效防止了码元走离现象,提高了传输距离;上行链路复用了下行链路中的一阶光边带以作为上行基带信号的载波,从而无需在基站中额外配置激光源;采用延时零拍法解调,减少了对毫米波本地振荡器的需求,降低了系统的成本。仿真结果表明,所提出的全双工模型中,仅用10 GHz频率的调制信号就能产生60 GHz的毫米波,大大降低了调制信号频率,且下行链路传输距离可达250 km,而上行链路传输距离大于300 km。
A new full-duplex optical wireless communication link model is proposed. In the scheme, two Mach-Zehnder modulators are cascaded in the downlink to generate sixfold millimeter-wave. Single-sideband modulation is adopted to effectively prevent the symbol from going away and improve the transmission distance. The downlink uses the downlink The first-order optical sideband in the link acts as a carrier for the upstream baseband signal, eliminating the need for additional laser sources in the base station. Using delayed zero-beat demodulation reduces the need for millimeter-wave local oscillators and reduces the need for system the cost of. The simulation results show that the proposed full-duplex model can generate 60 GHz millimeter wave with modulated signal of only 10 GHz, greatly reducing the frequency of modulated signal, and the downlink transmission distance can reach 250 km. The uplink Link transmission distance greater than 300 km.