Joint optimization of power allocation and relay position for lossy-forwarding relaying
Joint optimization of power allocation and relay position for lossy-forwarding relaying
复制标题
DOI：
10.1109/wcnc.2016.7565045
复制
发表时间：
2016-04
期刊：
影响因子：
--
通讯作者：
Shen Qian;M. Juntti;T. Matsumoto
中科院分区：
文献类型：
--
作者：
Shen Qian;M. Juntti;T. Matsumoto
为了使损耗转发中继的停电概率最小化，研究了功率分配和中继位置的联合优化问题。研究了固定中继位置的自适应中继器、固定中继比的自适应中继器以及总发射功率约束下的自适应中继器和自适应中继器的联合优化。在高信噪比条件下，导出了停电概率的封闭表达式。结果表明，与数值计算结果相比，封闭形式的表达式是足够精确的。然后，最优PA和最优RP可表述为一个凸优化问题。结果表明，采用自适应最优PA的系统性能优于功率分配均等的系统。自适应最优RP的停机性能优于中点RP。然而，PA和RP的联合优化优于半自适应优化算法。
Joint optimization of power allocation (PA) and relay position (RP) is investigated for a lossy-forwarding relaying in order to minimize the outage probability. We investigate adaptive PA with fixed relay position, adaptive RP with fixed PA ratio, and joint optimization of the PA and RP under total transmit power constraint. A closed-form expression of the outage probability is derived at the high signal-to-noise ratio regime. It is shown that the closed-form expression is sufficiently accurate compared to numerical calculation results. Then, the optimum PA and the optimum RP can be formulated as a convex optimization problem. It is found that the system performance with the adaptive optimum PA outperforms that with equal power allocation. The outage performance with the adaptive optimum RP outperforms that with midpoint RP. However, the joint optimization of the PA and RP is superior to the semi-adaptive optimization algorithms.