區(qū)域覆蓋下的最優(yōu)中繼部署與功率分配
doi: 10.11999/JEIT141444
基金項(xiàng)目:
國(guó)家自然科學(xué)基金(6117112)和國(guó)家科技重大專項(xiàng)(2013ZX 03003001-004)
Optimal Relay Deployment and Power Allocation for Extending Wireless Coverage
Funds:
The National Natural Science Foundation of China (61171112)
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摘要: 在大型建筑底層及偏遠(yuǎn)地區(qū)等，傳統(tǒng)的蜂窩網(wǎng)系統(tǒng)沒(méi)有提供可靠的無(wú)線覆蓋。該文采用中繼方式延伸基站的無(wú)線覆蓋至目標(biāo)區(qū)域。主要研究最優(yōu)的中繼部署與功率分配最小化目標(biāo)區(qū)域的最大中斷概率。功率分配是指在總功率受限的情況下，最優(yōu)化基站和中繼的發(fā)送功率。通過(guò)分析可以得到最優(yōu)的中繼部署，基站和中繼發(fā)送功率的比值不隨總功率的增加而變化。針對(duì)優(yōu)化問(wèn)題的非凸性質(zhì)，提出了一種獲得局部最優(yōu)解的算法。通過(guò)仿真可得給出算法的性能與窮搜索算法的性能基本重合。由于給出算法的復(fù)雜度較低，更適用于實(shí)際的系統(tǒng)。Abstract: 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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Key words:
- Wireless communication /
- Wireless coverage /
- Relay deployment /
- Power allocation /
- Outage probability
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