基于阵列天线波束赋形的蜂窝移动通信网络覆盖控制技术研究
发布时间：2019-02-22 15:25
【摘要】：在蜂窝移动通信网络中,公共控制信号强度、信干噪比均不低于门限的区域构成了小区的实际覆盖范围。根据传播环境及其变化,进行覆盖控制是蜂窝网络设计时和运营中的一项重要任务。 本文针对蜂窝移动通信网络,研究基于阵列天线波束赋形的的覆盖控制技术。 针对网络设计阶段全网无缝覆盖和小区间低干扰的要求,提出相应的阵列天线激励权值向量求解算法。我们引入弱覆盖面积比和过覆盖面积比这两个覆盖效果评价指标,将蜂窝网络分为许多个扇区簇,对每个扇区簇建立以弱覆盖面积比最小为优化目标,过覆盖面积比为约束条件的数学模型,通过近似、松弛等方法将其转化为凸优化问题,进而求出最优的阵列激励权值向量,并得出相应的弱覆盖面积比和过覆盖面积比。将上述方法以扇区簇为单位推广到全网,即可实现全网的无缝覆盖。仿真结果证实提出的算法可以使弱覆盖区域最小,过覆盖区域不存在。 针对网络运营阶段局部区域传播环境、季节的变化导致的覆盖质量下降,提出阵列天线激励权值向量的多扇区联合求解算法。将覆盖质量下降的区域称为待优化区域,建立以待优化区域最小SINR最大化为优化目标,相邻区域的SINR为约束条件的数学模型。为了使非凸的优化问题转化为易求解的凸优化问题,提出迭代算法,在迭代过程中逐步提升待优化区域内的最小SINR。仿真结果表明提出的算法得到的覆盖效果优于已有的扇区覆盖更新和联合波束赋形算法和功率穷举算法。 针对随着城市中高架桥、立交桥、高层建筑的增多而出现的立体覆盖需求,提出了用面阵天线波束赋形来进行立体覆盖控制的基本思路,重点阐述了天线立体方向图的数学表达以及最小二乘法综合天线立体方向图原理,并结合仿真进行了分析。
[Abstract]:In cellular mobile communication networks, the area where the common control signal strength and the signal-to-noise ratio are not lower than the threshold constitute the actual coverage range of the cell. According to the transmission environment and its changes, coverage control is an important task in the design and operation of cellular networks. In this paper, the coverage control technology based on array antenna beamforming is studied for cellular mobile communication networks. Aiming at the requirement of seamless coverage and low interference in the whole network during the network design phase, a corresponding algorithm for calculating the excitation weight vector of array antenna is proposed. In this paper, the weak coverage area ratio and the overcoverage area ratio are introduced to evaluate the coverage effect. The cellular network is divided into many sector clusters, and the minimum coverage area ratio is considered as the optimal target for each sector cluster. The mathematical model with overcoverage area ratio as a constraint condition is transformed into a convex optimization problem by approximate relaxation and so on. The optimal array excitation weight vector is obtained and the corresponding weak coverage area ratio and overcoverage area ratio are obtained. By extending the method to the whole network in sector cluster, the seamless coverage of the whole network can be realized. The simulation results show that the proposed algorithm can minimize the weak coverage region and overcover region does not exist. In order to reduce the coverage quality due to the seasonal variation of the local area propagation environment in the network operation phase, a multi-sector joint solution algorithm for the array antenna excitation weight vector is proposed. The region with reduced coverage quality is called the region to be optimized, and a mathematical model with minimum SINR maximization as the optimization objective and the SINR of the adjacent region as the constraint condition is established. In order to transform the non-convex optimization problem into a convex optimization problem that is easy to solve, an iterative algorithm is proposed, in which the minimum SINR. in the region to be optimized is raised step by step during the iteration process. Simulation results show that the proposed algorithm is better than the existing sector coverage updating and joint beamforming algorithm and power exhaustive algorithm. In view of the demand of stereoscopic coverage arising from the increase of viaduct, overpass and high-rise buildings in the city, the basic idea of using antenna beamforming to control stereoscopic coverage is put forward. The mathematical expression of the antenna stereoscopic pattern and the principle of the least square method for synthesizing the antenna stereoscopic pattern are described in detail, and the simulation results are analyzed.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.53
本文编号：2428353
[Abstract]:In cellular mobile communication networks, the area where the common control signal strength and the signal-to-noise ratio are not lower than the threshold constitute the actual coverage range of the cell. According to the transmission environment and its changes, coverage control is an important task in the design and operation of cellular networks. In this paper, the coverage control technology based on array antenna beamforming is studied for cellular mobile communication networks. Aiming at the requirement of seamless coverage and low interference in the whole network during the network design phase, a corresponding algorithm for calculating the excitation weight vector of array antenna is proposed. In this paper, the weak coverage area ratio and the overcoverage area ratio are introduced to evaluate the coverage effect. The cellular network is divided into many sector clusters, and the minimum coverage area ratio is considered as the optimal target for each sector cluster. The mathematical model with overcoverage area ratio as a constraint condition is transformed into a convex optimization problem by approximate relaxation and so on. The optimal array excitation weight vector is obtained and the corresponding weak coverage area ratio and overcoverage area ratio are obtained. By extending the method to the whole network in sector cluster, the seamless coverage of the whole network can be realized. The simulation results show that the proposed algorithm can minimize the weak coverage region and overcover region does not exist. In order to reduce the coverage quality due to the seasonal variation of the local area propagation environment in the network operation phase, a multi-sector joint solution algorithm for the array antenna excitation weight vector is proposed. The region with reduced coverage quality is called the region to be optimized, and a mathematical model with minimum SINR maximization as the optimization objective and the SINR of the adjacent region as the constraint condition is established. In order to transform the non-convex optimization problem into a convex optimization problem that is easy to solve, an iterative algorithm is proposed, in which the minimum SINR. in the region to be optimized is raised step by step during the iteration process. Simulation results show that the proposed algorithm is better than the existing sector coverage updating and joint beamforming algorithm and power exhaustive algorithm. In view of the demand of stereoscopic coverage arising from the increase of viaduct, overpass and high-rise buildings in the city, the basic idea of using antenna beamforming to control stereoscopic coverage is put forward. The mathematical expression of the antenna stereoscopic pattern and the principle of the least square method for synthesizing the antenna stereoscopic pattern are described in detail, and the simulation results are analyzed.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.53
【参考文献】
相关期刊论文 前9条
1 李晓明;陈新;金会彬;徐长胜;;利用智能天线广播波束赋形实现小区覆盖优化[J];电信科学;2009年06期
2 陈巍;王东明;王家恒;高飞飞;彭木根;;密集立体覆盖:未来移动通信的机遇和挑战[J];电信科学;2013年06期
3 刘鸿雁;胡春静;李远;;分层异构无线网络的协议架构和关键技术[J];电信科学;2013年06期
4 叶园;;波束赋形技术在TD-SCDMA网络优化中的应用[J];通信技术;2009年10期
5 孙娟娟;吴建威;;移动通信网络路测数据的抽样与分析方法[J];系统工程与电子技术;2009年01期
6 戈玲;邱杰;杨明帅;;GSM立体结构组网策略研究[J];移动通信;2008年21期
7 肖良勇;;TD智能天线广播波束赋形与网络优化[J];移动通信;2010年24期
8 李文利;;利用智能天线广播波束赋形实施TD网络优化[J];移动通信;2011年02期
9 韩金阳;应伟光;徐辉;;城市网络热点话务和深度覆盖解决策略[J];邮电设计技术;2008年09期
，本文编号：2428353
本文链接：https://www.wllwen.com/kejilunwen/wltx/2428353.html
