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中文摘要：
对MISO系统的发射功率分配和噪声形成方法进行讨论。首先建立MISO系统的人工噪声模型，将人工噪声等效为加性信道噪声，指出当人工噪声服从高斯分布是具有最大保密容量，并给出其保密容量表达式。然后在总发射功率受限的条件下，利用向量空间投影的方法推导保密容量最佳的功率分配方案。最后采用Box—Muller变换方法结合向量空间投影给出最佳功率分配方法下服从高斯分布的人工噪声生成方法。
英文摘要：
Adding artificial noise in the MISt system was an effective method to improve the security. The transmit power allocation and artificial noise generation was mainly discussed. An artificial noise model of MISt system was presented, in which the artificial noise was regarded as additive channel noise. It was proven that when the artificial noise was distributed on Gaussian distribution, the secrecy capacity of MISO system was maximized, and the expression of this secrecy capacity was deduced. Considering the transmit power constraint and using the vector space projection method, The optimum power allocation is obtained. Given a power allocation, the artificial noise is generated by Box-Muller transformation, which was distributed on Gaussian distribution. And with the vector projection method, the artificial noise meets the optimum power allocation.
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