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针对瑞利双向中继信道,首先研究了满足总功率受限条件下使双向通信中断概率最小化的功率分配问题;然后推导出了最优功率分配的闭式解,指出最优功率分配方案总是将一半总功率分配给中继节点;最后研究了最佳中继节点位置选择问题,指出最佳中继节点位置位于2个用户之间连线的中点.结果表明,采用最优功率分配的双向中继传输相对于2个用户之间的直接传输,可以获得更低的中断概率.
For the Rayleigh two-way relay channel, the power distribution problem that minimizes the interruption probability of bidirectional communication under the condition of total power constraint is firstly studied. Then the closed-form solution of the optimal power distribution is deduced, and the optimal power allocation scheme Is to allocate half of the total power to the relay node.Finally, we study the best choice of relay node location and point out that the best relay node is located at the midpoint of the connection between two users.The results show that the optimal power allocation Of the two-way relay transmission relative to the direct transmission between two users, you can get lower interrupt probability.