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文中针对放大转发双向中继系统,研究了物理层安全约束下的波束赋形方案设计及其安全容量问题。在假设已知完全信道状态信息的条件下,本文尝试通过在中继节点处采用波束赋形来使两个源节点的和安全容量最大化。由于对此问题难以求出闭式解,故而提出另一次优方案,并给出了相应波束赋形因子的闭式表达式。该方案虽不能最大化和安全容量,但却能显著提升和安全容量。最后对理论推导进行了仿真验证,理论分析与仿真结果证明了所提方案的有效性。
In this paper, aiming at the amplification and forwarding two-way relay system, the beamforming scheme design and its security capacity under physical layer security constraints are studied. Under the condition of knowing the complete channel state information, this paper attempts to maximize the sum security capacity of the two source nodes by using beamforming at the relay node. Since it is difficult to find the closed solution to this problem, another optimal solution is proposed and the closed-form expression of the corresponding beamforming factor is given. Although this solution can not maximize and secure capacity, it can significantly improve and secure capacity. Finally, the theoretical derivation is verified by simulation. The theoretical analysis and simulation results prove the effectiveness of the proposed scheme.