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中文摘要：
针对现有安全编码设计方法对信道条件依赖性强、收发无法共享随机性等问题,该文提出了一种多天线信道特征投影物理层安全编码算法。在满足信道互易性的时分双工系统中,多天线发射机根据单天线接收机发送的训练符号估计信道得到授权信道特征,利用信道特征投影生成投影矢量对,发射每个符号时随机选择投影矢量作为发射权重矢量,窃听接收机由于还原码字的汉明距离发生随机置乱而无法正确译码,从而实现安全传输。仿真结果表明：该算法使窃听者的误比特率接近0.5,授权接收机的误比特率较已有多天线物理层安全传输方法低一个数量级。
英文摘要：
This paper proposed a physical layer secrecy coding algorithm using multi-antenna channel characteristics projection in consideration of the existing secrecy coding＇s problems, such as channel condition dependence and random sharing. In channel reciprocal Time-Division-Duplex （TDD） system, multi-antenna transmitter estimates the authorized channel characteristics according to the training symbols transmitted by the single-antenna receiver, and then generates the pair of projected vectors through multi-antenna channel characteristics projection.While transmitting weighted vector is randomly selected from the pair of projected vectors symbol-by-symbol, the Hamming distances of wiretapper＇s demodulated codewords are radomly confused so that it is hard to decode normally and secure transmission is qualified, Simulation results show that the scheme makes the wiretapper＇s BER near approximately 0.5 and the authorized receiver＇s BER a level lower than the existing methods of multi-antenna physical layer secure transmission.
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