| 摘要: |
| 针对无线多播系统同时存在内、外部窃听者的复杂情况，提出随机化干扰的物理层多播安全传输算法。该算法基于收发天线构成信道的代数空间进行设计：一方面在内部窃听者的信道代数空间方向上不发送信息，另一方面在合法用户信道的正交方向上引入随机干扰信号。这样直接使得内部窃听者接收的信号受到能量削减的同时，非合法用户受到随机化干扰，最终实现了物理层多播信息的安全传输。理论分析和仿真结果表明，算法可同时保证系统内、外部窃听者极高的误码率，从而无法获取信息。 |
| 关键词: 多播系统 物理层安全 内部窃听者 外部窃听者 随机化干扰 |
| DOI： |
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| 基金项目:国家自然科学基金资助项目（61171108） |
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| Physical layer security algorithm for multicast system preventing internal/external eavesdroppers |
| ZHANG Wen,HUANG Ji-hai,JI Jiang |
| () |
| Abstract: |
| To prevent the internal/external eavesdroppers obtaining information in multicast communication system,this paper presents a random interference algorithm applied on the physical layer.The algorithm utilizes the algebra space consisted of the wireless channel states between transmiting antenna and receiving antenna to cancel the received signal of internal eavesdropper but add random interference to the received signal of external eavesdropper so that the multicast scure transmission is realized.The theoretical analysis and simulation prove that,with this algorithm,the internal/external eavesdropper can not acquire information because of very high bit error rate of signal. |
| Key words: multicast system physical layer security internal eavesdropper external eavesdropper random interference |
