In resent years, significant progress have been made in Free-Space Optical communication.
近年来,自由空间光通信技术取得了很大的发展。
参考来源 - 激光无线通信系统的DSP实现及仿真研究·2,447,543篇论文数据,部分数据来源于NoteExpress
N a region that has no gravitational and electromagnetic fields: used as an absolute standard 自由空间; 没有重力场和电磁场的区域,被用作绝对标准 (Also called (no longer in technical usage) vacuum)
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