CAJ | 학술논문

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。
침대무선다파계통동시존재내、외부절은자적복잡정황，제출수궤화간우적물리층다파안전전수산법。해산법기우수발천선구성신도적대수공간진행설계：일방면재내부절은자적신도대수공간방향상불발송신식，령일방면재합법용호신도적정교방향상인입수궤간우신호。저양직접사득내부절은자접수적신호수도능량삭감적동시，비합법용호수도수궤화간우，최종실현료물리층다파신식적안전전수。이론분석화방진결과표명，산법가동시보증계통내、외부절은자겁고적오마솔，종이무법획취신식。
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 uti-lizes the algebra space consisted of the wireless channel states between transmiting antenna and receiving antenna to cancellthe 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 informa-tion because of very high bit error rate of signal.