【摘要】：在蜂窩移動(dòng)通信網(wǎng)絡(luò)中,公共控制信號(hào)強(qiáng)度、信干噪比均不低于門限的區(qū)域構(gòu)成了小區(qū)的實(shí)際覆蓋范圍。根據(jù)傳播環(huán)境及其變化,進(jìn)行覆蓋控制是蜂窩網(wǎng)絡(luò)設(shè)計(jì)時(shí)和運(yùn)營(yíng)中的一項(xiàng)重要任務(wù)。 本文針對(duì)蜂窩移動(dòng)通信網(wǎng)絡(luò),研究基于陣列天線波束賦形的的覆蓋控制技術(shù)。 針對(duì)網(wǎng)絡(luò)設(shè)計(jì)階段全網(wǎng)無(wú)縫覆蓋和小區(qū)間低干擾的要求,提出相應(yīng)的陣列天線激勵(lì)權(quán)值向量求解算法。我們引入弱覆蓋面積比和過(guò)覆蓋面積比這兩個(gè)覆蓋效果評(píng)價(jià)指標(biāo),將蜂窩網(wǎng)絡(luò)分為許多個(gè)扇區(qū)簇,對(duì)每個(gè)扇區(qū)簇建立以弱覆蓋面積比最小為優(yōu)化目標(biāo),過(guò)覆蓋面積比為約束條件的數(shù)學(xué)模型,通過(guò)近似、松弛等方法將其轉(zhuǎn)化為凸優(yōu)化問(wèn)題,進(jìn)而求出最優(yōu)的陣列激勵(lì)權(quán)值向量,并得出相應(yīng)的弱覆蓋面積比和過(guò)覆蓋面積比。將上述方法以扇區(qū)簇為單位推廣到全網(wǎng),即可實(shí)現(xiàn)全網(wǎng)的無(wú)縫覆蓋。仿真結(jié)果證實(shí)提出的算法可以使弱覆蓋區(qū)域最小,過(guò)覆蓋區(qū)域不存在。 針對(duì)網(wǎng)絡(luò)運(yùn)營(yíng)階段局部區(qū)域傳播環(huán)境、季節(jié)的變化導(dǎo)致的覆蓋質(zhì)量下降,提出陣列天線激勵(lì)權(quán)值向量的多扇區(qū)聯(lián)合求解算法。將覆蓋質(zhì)量下降的區(qū)域稱為待優(yōu)化區(qū)域,建立以待優(yōu)化區(qū)域最小SINR最大化為優(yōu)化目標(biāo),相鄰區(qū)域的SINR為約束條件的數(shù)學(xué)模型。為了使非凸的優(yōu)化問(wèn)題轉(zhuǎn)化為易求解的凸優(yōu)化問(wèn)題,提出迭代算法,在迭代過(guò)程中逐步提升待優(yōu)化區(qū)域內(nèi)的最小SINR。仿真結(jié)果表明提出的算法得到的覆蓋效果優(yōu)于已有的扇區(qū)覆蓋更新和聯(lián)合波束賦形算法和功率窮舉算法。 針對(duì)隨著城市中高架橋、立交橋、高層建筑的增多而出現(xiàn)的立體覆蓋需求,提出了用面陣天線波束賦形來(lái)進(jìn)行立體覆蓋控制的基本思路,重點(diǎn)闡述了天線立體方向圖的數(shù)學(xué)表達(dá)以及最小二乘法綜合天線立體方向圖原理,并結(jié)合仿真進(jìn)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.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN929.53

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