TDMA无线Mesh网络中基于面积频谱效率的资源分配技术研究

发布时间：2018-07-20 16:17

【摘要】：在未来的无线通信领域中,无线网状网能够为用户提供更优质的服务。它能够动态地进行自组织、自配置,为移动的或静止的终端提供健壮的、可靠的和成本较低的网络连接,它代表着无线网络的又一大跨越,有着广阔的应用前景。然而,作为一项新的网络技术,无线网状网在实际应用中面临着很多挑战,例如能量效率较低、接口技术复杂、可扩展性和安全性存在隐患等。针对能量效率较低的问题工业界和学术界已经有很多人对此做了相关的研究。本文采用一种新的量化无线网状网能量效率的准则:面积频谱效率。用它来衡量网络高速传输数据的频谱和空间上的能耗,该准则综合考虑了影响能耗的吞吐量、功率及覆盖面积等因素。本文研究基于时分多址接入的无线网状网系统,以面积频谱效率为准则,进行了两方面的研究。首先在时分多址接入系统中,时隙只分配给一条链路,链路之间不存在相互干扰,得到调度的节点对构成了点对点信道。在此场景下,以面积频谱效率为优化目标,考虑节点的功率控制,建立优化模型。其次,在多跳网络中将时分多址接入扩展至空间时分多址接入。空间时分多址接入的显著优势在于空间距离足够远的节点能够重复利用时隙,使网络频谱的利用率有所提高。在此系统下,本文将时隙分配给两条链路,得到调度的链路对构成X信道,此时链路之间存在干扰,因此需要利用干扰模型来分配资源以达到优化面积频谱效率的目的。根据优化问题,本文在求解优化模型时,将问题分解为两部分:功率的分配和时隙的分配。在分配功率时,我们采用非线性单纯形法和内点罚函数法求解约束条件下的非线性优化问题,而在分配时隙时,我们利用分支定界法求解0-1整数规划模型。最后,本文通过仿真给出了面积频谱效率在不同仿真参数环境下的变化趋势。在空间时分多址接入的无线网状网中,利用时隙复用,可以提高面积频谱效率。为了观察噪声对面积频谱效率的影响,分别在这两种场景中对其进行了仿真,仿真结果表明,噪声的增加会降低面积频谱效率。
[Abstract]:In the future wireless communication field, wireless mesh network can provide users with better service. It can dynamically self-organize, self-configure, provide robust, reliable and low-cost network connection for mobile or static terminals. It represents another big leap of wireless network and has a broad application prospect. However, as a new network technology, wireless mesh networks are faced with many challenges in practical applications, such as low energy efficiency, complex interface technology, hidden dangers in scalability and security, and so on. There have been many researches on energy efficiency in industry and academia. In this paper, a new energy efficiency criterion for quantized wireless mesh networks, area spectrum efficiency, is adopted. It is used to measure the spectral and spatial energy consumption of high-speed data transmission in the network. This criterion takes into account the factors affecting the throughput, power and coverage area of energy consumption. In this paper, a wireless mesh network system based on time division multiple access (TDMA) is studied. In the TDMA system, the time slot is allocated to only one link, and there is no interference between the links. In this scenario, the area spectrum efficiency is taken as the optimization objective, and the power control of the node is considered, and the optimization model is established. Secondly, time division multiple access is extended to spatial time division multiple access in multi-hop networks. The significant advantage of spatial-time-division multiple access is that the nodes which are far enough in space can reuse the time slots and improve the efficiency of the network spectrum. In this system, the time slots are allocated to two links, and the scheduled link pairs constitute X channel. In this case, there is interference between the links, so the interference model is needed to allocate resources to optimize the area spectrum efficiency. According to the optimization problem, when solving the optimization model, the problem is decomposed into two parts: power allocation and slot allocation. In the case of power allocation, we use nonlinear simplex method and interior point penalty function method to solve nonlinear optimization problems under constrained conditions, while in allocating time slots, we use the branch and bound method to solve the 0-1 integer programming model. Finally, the change trend of area spectrum efficiency under different simulation parameters is given by simulation. In spatial time division multiple access (STDMA) wireless mesh networks, the area spectrum efficiency can be improved by using time slot multiplexing. In order to observe the effect of noise on the area spectrum efficiency, the two scenarios are simulated. The simulation results show that the increase of noise can reduce the area spectrum efficiency.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5

【参考文献】