| 摘要: |
| 四维天线阵能够在保持瞬时方向性不变的情况下使得仅侧射方向合法接收机能够准确接收完整信号，而位于非侧射方向的不期望接收机不能准确接收完整信号。这一保密通信功能的实现不需要引入新的天线结构，也无需使用传统阵列中移相器、衰减器，但是其误码率波束宽度等性能较传统天线阵有所牺牲。提出了一种改进时间序列的四维天线阵方向调制技术。通过合理地设计时间序列，该四维天线阵在实现保密通信的同时，相较于传统天线阵还具有更窄的误码率波束宽度、更高的误码率副瓣、更强的不期望方向混叠效应。此外，引入优化时间序列的四维天线阵还具备结构简单、设计灵活的优势，在保密通信等应用中前景良好。 |
| 关键词: 保密通信 四维天线阵 方向调制 时间序列 |
| DOI：10.20079/j.issn.1001-893x.230102001 |
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| 基金项目: |
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| A directional modulation technique based on four-dimensional antenna array with an improved time sequence |
| SUN Chao |
| (Southwest China Institute of Electronic Technology,Chengdu 610036，China) |
| Abstract: |
| The four-dimensional antenna array can keep the instantaneous directivity unchanged,and only the legitimate receivers in the broadside direction can accurately recover the complete signal,while the undesired receivers located in the non-broadside direction cannot accurately receive the complete signal.The realization of this secure communication function does not require the introduction of new antenna structures,nor does it require the use of phase shifters and attenuators in traditional arrays.However,its performance such as bit error rate(BER) and beam width is sacrificed compared with traditional antenna arrays.A four-dimensional antenna array direction modulation technology based on improved time sequence is proposed.By designing the time sequence reasonably,the four-dimensional antenna array can realize secure communication with a narrower BER beamwidth,higher BER sidelobes,and stronger aliasing effects in undesired directions,compared with traditional antenna arrays.In addition,the four-dimensional antenna array with optimized time sequence has the advantages of simple structure and flexible design,and has broad prospects in applications such as secure communication. |
| Key words: secure communication four-dimensional antenna array direction modulation time sequence |
