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针对多用户MIMO窃听信道,提出了在未知非法接收者任何信息的前提下,实现可信通信的基于消息块的人为干扰和预编码算法,并且在实现可信通信可信性的同时,考虑了有效性和效率问题.人为干扰仅干扰非法接收者,而不对合法接收者产生任何影响.预编码算法是已有的用于消除多用户干扰的迫零方式与基于SVD分解的线性预编码方式的结合.与基于单消息符号的预编码方式相比,提高了可信通信的效率.仿真结果表明,其进一步降低了非法接收者的SINR,并提高了多用户MIMO系统的通信容量.“,”For confidential communications in a multi-user MIMO wiretap channel,though no information regarding the illegitimate receiver was presumed at the transmitter,an artificial interference and a precoding technique based on mes-sage block were proposed.Except for confidentiality,the effectivity and efficiency of confidential communications were also taken into consideration.The artificial interference selectively degraded the passive illegitimate receiver' signal while did not effect every legitimate receiver.The precoding technique combined the existed zero-forcing method that used to eliminate the multi-user interference with singular value decomposition(SVD)-based linear precoder so that en-hances the efficiency of confidential communications.Simulation result shows that this precoding method degrades the illegitimate receiver' signal to interference plus noise ratio(SINR) even more and enhances the capacity of multi-user MIMO system compared with the precoding method based on single message symbol.