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在系统总功率一定的情况下,通过在协同节点间进行优化的功率分配以改善系统的接收性能.针对单中继协同传输,推导了节点间最优功率分配因子的闭式表达式,给出了中继节点的激活条件,仅当信道的衰落特性满足该条件时,中继节点才发送信号到目的节点,否则进入空闲状态.多节点协同传输场景下,直接根据系统的输出信噪比难以得到节点间最优功率分配因子的闭式表达式.因此,推导了系统输出信噪比的上界,在此基础上,提出了一种新的功率分配方法.将整个功率分配过程分成两步,采用迭代的方法实现节点间的最优功率分配.仿真结果表明,对于单中继节点的情况,所提出的功率分配方案能够获得约1～2 dB的性能增益,随着参与协同传输的节点数的增大,迭代的功率分配可使系统获得显著的性能提升.
In the case of a certain total system power, the system’s receiving performance is improved by optimizing the power allocation among the cooperating nodes. For the single relay coordinated transmission, the closed-form expression for the optimal power allocation factor among nodes is deduced and given The relay node activation condition, only when the channel fading characteristics meet the conditions, the relay node before sending signals to the destination node, or enter the idle state.Now the multi-node collaborative transmission scenario, directly according to the system output signal to noise ratio is difficult The closed-form expression of the optimal power distribution factor between nodes is obtained.Thus, the upper bound of the output SNR of the system is deduced and a new power allocation method is proposed based on which the whole power distribution process is divided into two steps , The optimal power allocation between nodes is achieved by iterative method.The simulation results show that for the single relay node, the proposed power allocation scheme can obtain the performance gain of about 1 ~ 2 dB, and as the nodes involved in coordinated transmission Increasing the number of iterative power distribution allows the system to obtain significant performance improvements.