在大型建筑底层及偏远地区等，传统的蜂窝网系统没有提供可靠的无线覆盖。该文采用中继方式延伸基站的无线覆盖至目标区域。主要研究最优的中继部署与功率分配最小化目标区域的最大中断概率。功率分配是指在总功率受限的情况下，最优化基站和中继的发送功率。通过分析可以得到最优的中继部署，基站和中继发送功率的比值不随总功率的增加而变化。针对优化问题的非凸性质，提出了一种获得局部最优解的算法。通过仿真可得给出算法的性能与穷搜索算法的性能基本重合。由于给出算法的复杂度较低，更适用于实际的系统。%There is often no cellular connection in the basement level of large buildings and in remote unpopulated areas. In this paper, a relay is deployed to extend the wireless coverage of a base station to a target area. Models, analytical results, and algorithms are proposed to study the optimal relay position and power allocation for minimizing the maximum outage probability over the entire area. Based on the analysis, as the total transmit power of the base station and relay increases, the optimal relay position and the transmit power ratio of the base station and relay remain the same. The complexity of the proposed algorithm is much lower than, but it achieves almost the same performance as that of the exhaustive searching method based on numerical simulations, which is more suitable for the practical system.
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