基于OFDMA异构网络的信道分配研究

发布时间：2019-03-13 08:48

【摘要】：异构网络能够提升通信系统的容量,改善了传统蜂窝网的一些系统性能,而且部署的经济成本低并且比较灵活,日趋成为通信网络的一种主要网络结构。OFDMA技术能够提供高速率的数据传输以及高的频谱利用率,是一种重要的多址接入技术,已经成为业界研究的重点。可靠性是衡量通信系统的一项重要指标,一直以来是该领域研究的重点与难点。无线信道的分配严重影响着通信系统的可靠性,为了提高基于OFDMA的异构网络的可靠性,本文主要研究了基于OFDMA技术的异构网络中的信道分配问题,通过设计合理的信道分配算法,提升了系统的可靠性。本论文的主要研究工作:1)首先,本文研究了单小区异构网络中信道分配的问题,并结合传统的Greedy和WSA算法的思想,提出了一种新的基于子信道的信道分配算法,即Global Greedy算法。先详细介绍了系统模型并为求解的问题建立了数学模型,然后介绍了三种传统的信道分配算法,包括传统的Greedy算法、WSA算法和Hungarian算法,接着提出了Global Greedy算法,最后通过设置不同的网络场景,借助matlab仿真平台对算法进行了验证,仿真结果表明Global Greedy算法的BER性能优于传统的Greedy算法和WSA算法,其性能曲线更接近于Hungarian算法的BER性能曲线。2)其次,研究了多小区异构网络的信道分配问题,提出了多小区信道分配算法。多小区异构网络存在的小区间干扰严重影响着通信网络的性能,本文在小区干扰的场景下,提出了基于干扰的Greedy算法,基于干扰的的WSA算法和基于干扰的Hungarian算法,然后在不同的网络场景下用matlab仿真平台进行了BER性能仿真验证,结果表明基于干扰的Hungarian算法性能最好,其次是基于干扰的WSA算法,而基于干扰的Greedy算法的性能最差。同时,也对不同算法对系统的可靠性的影响做了分析、比较与总结。
[Abstract]:Heterogeneous networks can improve the capacity of communication systems, improve some of the system performance of traditional cellular networks, and the cost of deployment is low and flexible. OFDMA technology, which can provide high-speed data transmission and high spectrum efficiency, is an important multi-access technology, which has become the focus of research in the industry. Reliability is an important index to measure the communication system, and has been the focus and difficulty in this field. The allocation of wireless channels seriously affects the reliability of communication systems. In order to improve the reliability of heterogeneous networks based on OFDMA, this paper mainly studies the problem of channel allocation in heterogeneous networks based on OFDMA technology. The reliability of the system is improved by designing a reasonable channel allocation algorithm. The main work of this thesis is as follows: 1) in this paper, the problem of channel assignment in single-cell heterogeneous networks is studied, and a new channel allocation algorithm based on subchannel is proposed based on the traditional Greedy and WSA algorithms. That is, Global Greedy algorithm. Firstly, the system model is introduced in detail and the mathematical model is established to solve the problem. Then three traditional channel allocation algorithms are introduced, including the traditional Greedy algorithm, the WSA algorithm and the Hungarian algorithm, and then the Global Greedy algorithm is proposed. Finally, by setting different network scenarios, the algorithm is verified by matlab simulation platform. The simulation results show that the BER performance of Global Greedy algorithm is better than that of traditional Greedy algorithm and WSA algorithm. Its performance curve is closer to the BER performance curve of Hungarian algorithm. 2) secondly, the problem of channel allocation for multi-cell heterogeneous networks is studied, and a multi-cell channel allocation algorithm is proposed. The performance of communication network is seriously affected by the inter-cell interference in multi-cell heterogeneous networks. In this paper, the interference-based Greedy algorithm, the interference-based WSA algorithm and the interference-based Hungarian algorithm are proposed in the context of cell interference. Then the performance of BER is verified by matlab simulation platform in different network scenarios. The results show that the performance of Hungarian algorithm based on interference is the best, the performance of WSA algorithm based on interference is the second, and the performance of Greedy algorithm based on interference is the worst. At the same time, the influence of different algorithms on the reliability of the system is analyzed, compared and summarized.
【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】：2015
【分类号】：TN929.53

【共引文献】