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首页> 外文学位 >Adaptive multiple access and resource allocation with guaranteed QoS for broadband OFDM wireless networks.
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Adaptive multiple access and resource allocation with guaranteed QoS for broadband OFDM wireless networks.

机译：宽带OFDM无线网络中具有保证QoS的自适应多路访问和资源分配。

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摘要

The next generation wireless systems are expected to provide universal personal and multimedia communications without regard to the users' mobility and location. These services will include heterogeneous classes of traffics such as voice, file transfer, web browsing, wireless multimedia, teleconferencing, and interactive games, etc. The major challenges we are confronted with include the harsh wireless channel, scarce resources such as power and spectrum, and very diverse QoS (Quality of Services) requirements. This stimulates the development of intelligent resource management algorithms to achieve efficient utilization of radio resources, provide QoS differentiation and guarantees, and ultimately enable ubiquitous and high-rate communications over a limited frequency spectrum.; In this thesis, we will present joint MAC-PHY layer resource allocation algorithms for OFDM systems. OFDM is recently recognized as one of the leading candidates for supporting the next generation wireless communication systems. Building our work upon a multiuser OFDM architecture, we will maximize the overall power or spectral efficiency by exploiting the inherent system diversity in the frequency, time, space, and user domains through an intelligent management of bandwidth allocation, multiple access, adaptive modulation and coding, along with power allocation. Particularly, we will propose dynamic resource allocation algorithms for four multiuser OFDM systems. These are (1) uncoiled system; (2) coded system; (3) MIMO system; and (4) packet-switched system.; For the multiuser uncoded OFDM system, we propose for downlink transmission a low-complexity resource allocation algorithm that includes dynamic cell selection, adaptive modulation, and adaptive subcarrier allocation. We then extend the work to the TCM encoded OFDM system, in which the SER, BER, and BPS performance as well as the optimal switching levels are derived. For MIMO/OFDM systems, we propose for the uplink transmission three low-complexity subcarrier-bit-and-power allocation algorithms when different receiver structures are adopted at the BS. These algorithms exploit the additional space domain freedom and present intelligent SDMA solutions. Finally, we extend our work to the cross-layer design and optimization of packet-switched networks. In this algorithm, the bandwidth and power allocation in the PHY and MAC layers are designed within an integrated framework to take advantages of the inter-dependencies between the two layers. (Abstract shortened by UMI.)
机译：下一代无线系统有望提供通用的个人和多媒体通信，而无需考虑用户的移动性和位置。这些服务将包括不同种类的流量，例如语音，文件传输，Web浏览，无线多媒体，电话会议和交互式游戏等。我们面临的主要挑战包括恶劣的无线信道，稀缺的资源（例如功率和频谱），以及各种各样的QoS（服务质量）要求。这刺激了智能资源管理算法的发展，以实现无线电资源的有效利用，提供QoS区分和保证，并最终在有限的频谱上实现无处不在的高速率通信。在本文中，我们将提出用于OFDM系统的联合MAC-PHY层资源分配算法。 OFDM最近被公认为是支持下一代无线通信系统的主要候选者之一。通过在多用户OFDM体系结构上开展工作，我们将通过对带宽分配，多址，自适应调制和编码的智能管理来利用频率，时间，空间和用户域中固有的系统多样性，从而最大程度地提高整体功率或频谱效率，以及电源分配。特别是，我们将为四个多用户OFDM系统提出动态资源分配算法。这些是（1）未卷曲的系统； （2）编码系统； （3）MIMO系统； （4）分组交换系统。对于多用户未编码OFDM系统，我们为下行链路传输提出了一种低复杂度的资源分配算法，该算法包括动态小区选择，自适应调制和自适应子载波分配。然后，我们将工作扩展到TCM编码的OFDM系统，在其中得出SER，BER和BPS性能以及最佳切换级别。对于MIMO / OFDM系统，当基站采用不同的接收机结构时，我们为上行链路传输提出了三种低复杂度的子载波比特和功率分配算法。这些算法利用了额外的空间域自由度，并提出了智能SDMA解决方案。最后，我们将工作扩展到分组交换网络的跨层设计和优化。在此算法中，PHY和MAC层中的带宽和功率分配是在集成框架内设计的，以利用两层之间的相互依赖性。 （摘要由UMI缩短。）

著录项

  • 作者

    Zhang, Yingjun.;

  • 作者单位

    Hong Kong University of Science and Technology (People's Republic of China).;

  • 授予单位 Hong Kong University of Science and Technology (People's Republic of China).;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 129 p.
  • 总页数 129
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;
  • 关键词

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