【摘要】 电力系统通信网是确保电网安全、稳定、经济运行的重要组成部分。电力专网中主要采用光纤传输系统，尽管该系统能提供较大的传输带宽，但仍存在信噪比提升的瓶颈。基于此，提出一种数字模拟混合交织调制的传输方案，在发射端，将原始波形拆分成离散的数字部分和连续的模拟部分，并进行复用传输。在接收端，通过取整运算移除数字部分的链路噪声，同时利用模拟部分的线性组合提升频谱效率。在此基础上，通过同相和正交分量的时域交织降低峰均功率比，从而在峰值功率受限的条件下提升有效信噪比。在直接检测系统实验中，经过1 km标准单模光纤直接检测传输后，68 GBd数字模拟混合交织调制信号的恢复信噪比能够达到33.0 dB，可支持17 GHz带宽的1 024进制正交幅度调制（1 024-ary quadrature amplitude modulation,1 024-QAM）信号接入，实现170 Gbit/s的比特率，以及1 Tbit/s的通用公共射频接口等效速率。仿真和实验结果表明，与传统调制方案相比，所提出的交织型数字模拟混合方案具有信噪比增益，为低成本、大带宽、高保真的电力专网提供了一个可行的解决方案。更多还原

【Abstract】 Power communication network is an important part to ensure the safe, stable, and economical operation of power grid. The optical fiber transmission system is widely used in the power communication network to provide wide bandwidth. However, there is a signal-to-noise ratio obstacle for high-fidelity transmission. Based on this, an interleaved digital-analog hybrid modulation scheme was proposed. At the transmitter, the original waveform was divided into a discrete digital part and a continuous analog part. At the receiver, the link noise in the digital part was removed by rounding operation, and the spectral efficiency was improved by the linear combination of analog part. Besides, the time-domain interleaving of in-phase and quadrature components reduced the peak-to-average power ratio,and enhanced the effective signal-to-noise ratio under the peak power constraint. In the direct detection-based experiment, after 1 km standard single-mode fiber transmission, the recovered signal-to-noise ratio of 68 GBd signal with interleaved digital-analog modulation could achieve 33.0 dB, which supports the 1 024-ary quadrature amplitude modulation(1 024-QAM) signal with 17 GHz bandwidth. The corresponding bitrate was 170 Gbit/s, and the common public radio interface-equivalent rate was 1 Tbit/s. Both simulation and experimental results indicate that the interleaved digital-analog modulation scheme exhibits a signal-to-noise ratio gain compared with the conventional modulation scheme, and offers a feasible scheme for low-cost, high-bandwidth and high-fidelity power communication network.更多还原