宽带电力线自适应OFDM资源分配研究

发布时间：2018-03-14 15:21

本文选题：电力线通信　切入点：OFDM　出处：《华北电力大学(北京)》2014年硕士论文　论文类型：学位论文

【摘要】：电力线载波通信技术存在已久,其为接入网的实现提供了一个非常有效的解决平台。它通过配电网低压线路传输语音、图像、高速数据等多媒体业务信号,具有分布广、不需要重新布线等优点。但是电力线信道多径效应、衰减、时变等缺点成为了“最后一公里”数据高速传输的瓶颈。因此正交频分复用技术(OFDM, Orthogonal Frequency Division Multiplexing)的出现无疑是雪中送炭,它既有抗多种干扰的能力,又可以提高频谱的利用率,在实现电力线载波通信上越来越受到重视。论文首先介绍了宽带电力线通信技术的背景及发展现状,研究了OFDM自适应技术的系统模型、实现该系统的技术前提以及自适应资源分配的算法分类。针对宽带电力线系统单用户资源分配计算复杂性问题,提出了一种自适应批量加载比特的快速分配算法,分为信道质量等级划分、选择子载波集、通过阈值判断加载门限等六个步骤,过程简单,在达到逐比特位添加算法分配效果的同时,大幅度降低了计算复杂度。然后在单用户比特分配的基础上研究了宽带电力线多用户的自适应资源分配,针对其多目标、多用户分配问题,建立了多用户自适应资源分配数学模型,通过子载波和比特分步走的分配方式,提出一种行列消除子载波动态资源分配算法,算法以速率自适应为基本准则,在保证每个用户的固定速率的同时,最大化系统吞吐量。通过在典型电力线信道环境下仿真实验,实验结果符合理论预期,提高了电力线系统资源分配的性能。
[Abstract]:Power line carrier communication technology has existed for a long time, which provides a very effective solution platform for the realization of access network. It transmits multimedia service signals such as voice, image, high-speed data and so on through low voltage lines of distribution network. However, the disadvantages of multipath effect, attenuation and time-varying of power line channel become the bottleneck of "last kilometer" high-speed data transmission. Therefore, the emergence of OFDM (Orthogonal Frequency Division Multiplexing) is undoubtedly a snow-in-transit. It not only has the ability to resist many kinds of interference, but also can improve the efficiency of spectrum. It is paid more and more attention to realize the power line carrier communication. Firstly, this paper introduces the background and development status of broadband power line communication technology. This paper studies the system model of OFDM adaptive technology, the technical premise of the system and the algorithm classification of adaptive resource allocation. In this paper, a fast allocation algorithm of adaptive batch loading bits is proposed, which is divided into six steps: channel quality level partition, subcarrier set selection, loading threshold judging by threshold, etc. The procedure is simple. At the same time, the computational complexity is greatly reduced. Then, the adaptive resource allocation of broadband power line multi-user is studied on the basis of single user bit allocation, aiming at its multi-objective. In this paper, a mathematical model of multi-user adaptive resource allocation is established. By means of sub-carrier and bit step allocation, a dynamic resource allocation algorithm for eliminating subcarriers is proposed. The algorithm is based on rate adaptation. At the same time, the system throughput is maximized while the fixed rate of each user is guaranteed. The simulation results in typical power line channel environment show that the experimental results meet the theoretical expectations and improve the performance of power line system resource allocation.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN913.6

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