無線寬帶定位網(wǎng)絡中的資源分配優(yōu)化研究
[Abstract]:With the rapid development of wireless communication technology, accurate location information is one of the basic conditions for modern information technology to provide services. Besides measuring environment and measuring method, it is also influenced by resource allocation scheme. In this paper, based on the resource allocation optimization in wireless wideband location networks, a joint power bandwidth allocation model (Joint Power and Bandwidth Allocation,JPBA) is established to provide guidance for resource allocation optimization in wireless location networks. Through our analysis, the joint power bandwidth optimization model is a non-convex problem, which can not be directly solved. In this paper, an approximate solution with low complexity and high accuracy is presented by optimization theory. Because the above optimal resource allocation optimization model is based on the location of the real target node, there is an error between the position of the target node measured and the real location in the actual measurement and positioning process. In this paper, a low complexity and robust resource allocation optimization method is presented, which can give robust resource allocation results when the location of the target node is uncertain. The specific research contents include the following three aspects: first, this paper is based on the theory of wireless broadband location network based on time of arrival estimation. Based on square location error bound (Square Position Error Bound,SPEB), an optimal model of joint power and bandwidth allocation in wireless wideband positioning networks is established, such as the optimal positioning accuracy model and the optimal power utilization model. Because the model of joint power and bandwidth allocation optimization is a non-convex problem, it can not be directly solved. Based on the knowledge of geometric programming in optimization theory, a low complexity approximate solution method is presented in this paper. Secondly, because of the lack of prior knowledge and measurement error, there is a deviation between the position of the target node and the real position in the actual positioning measurement. The optimization model of resource allocation based on the location of real target nodes is not robust. In this paper, a simple robustness method is proposed based on the far-field approximation condition, which can provide a robust resource allocation scheme when the location of the target node is uncertain. Thirdly, we have carried out a lot of numerical simulation. Through the simulation results, we find that the JPBA method is much better than the simple power allocation optimization and uniform allocation in location performance and power resource efficiency. It verifies our previous inferences and assumptions. At the same time, we find that with the increase of the uncertainty of the target node position, the optimal JPBA method will lose its localization ability, but the robust JPBA can avoid the problem of the performance degradation caused by the location error. It can provide guidance for the design of the actual positioning system.
【學位授予單位】:哈爾濱工業(yè)大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:TN92
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