High Data Rate Wireless Networks: A Power Efficiency Perspective

高数据速率无线网络：功率效率观点Aazhang和A.在过去的五年里，从有线内陆连接到普遍的无线信息访问，出现了文化上的转变。大多数新兴的移动的设备现在都配备了某种形式的嵌入式无线电。对高数据速率和更长电池寿命的期望给无线系统设计的各个方面带来了巨大的压力。为了应对下一代无线系统的挑战，需要对跨层设计有全新的理解，并需要利用所有可用维度进行优化的新方法。以下议程概述了我们正在追求的研究框架的关键要素，以实现更高的电源效率，同时提高系统范围的吞吐量。公平性，延迟和功率效率：传统的网络协议解决用户之间的吞吐量公平性和应用程序的延迟要求，而通信算法解决位置相关的可靠性，收发器功率和信道接入。本计画提出一个架构，系统地分析与设计高效能的存取与排程协定。使用短时间尺度信道变化沿着源突发性，最小功率机会调度器将满足延迟要求，同时保持系统范围的统计公平性。可伸缩空时码：为了实现从分组和流调度的增益，关键是物理层编码能够服务于调度的数据速率。同时，为了实现高水平的频谱和功率效率，重要的是编码方法利用尽可能多的关于发射机处的信道的可用信息。因此，本研究项目所针对的设计空间涵盖了广泛的移动的速度和信道条件。特别地，空时码被设计成在接收机处具有不精确的信道信息或没有信道信息，而在发射机处没有信息，覆盖高到中等移动的速度通信。针对低速移动台，解决了空时编码方法中有效反馈信道设计的基本问题.集成到无线研究平台：低功耗设计的强大理论创新在莱斯大学的多天线系统快速原型平台上进行了测试。 对端到端系统设计和开发进行了压力测试，并对整个系统的功率和频谱效率进行了量化。正在进行的研究为理解频谱效率、算法复杂度和功耗之间的基本关系铺平了道路，从而提高了具有无线功能的移动的设备的实用性，并直接影响其新兴市场。该项目对教育的更广泛的影响是通过在我们实验室的项目中吸引大量的本科生和研究生来确保的。

High Data Rate Wireless Networks: A Power Efficiency PerspectiveB. Aazhang and A. SabharwalDepartment of Electrical and Computer Engineering, Rice UniversityIn the last five years, there has been a cultural shift from wired landlocked connectivity to pervasive wireless information access. Most emerging mobile devices are now equipped with some form of embedded wireless radio. The expectations of high data rates and increased battery longevity have put tremendous pressure on all aspects of wireless system design. To meet the challenges of next generation wireless systems, there is a need for fundamentally new understanding in cross-layer design as well as new methods which exploit all available dimensions for optimizations. The following agenda outlines the key elements of the research framework we are pursuing to achieve increased power efficiency while simultaneously increasing system wide throughput.1. Fairness, delay and power efficiency: Traditionally network protocols address throughput fairnessamong users and delay requirement of applications while communication algorithms address location dependent reliability, transceiver power, and channel access. This project develops a framework to systematically analyze and design power efficient access and scheduling protocols. Using short time scale channel variations along with source burstiness, the minimal power opportunistic scheduler will meet delay requirements while maintaining a system wide statistical fairness.2. Scalable space-time codes: To achieve the gains from packet and flow scheduling, it is critical that the physical layer coding be able to serve the scheduled data rates. At the same time to achieve high levels of spectral and power efficiency, it is important that the coding methods exploit as much information available regarding the channel at the transmitter. Thus, the design space targeted by this research project covers a wide range of mobile speeds and channel conditions. In particular, space-time codes are designed that have either imprecise or no channel information at the receiver with no information at the transmitter, covering high to medium mobile speed communications. And for low speed mobiles, the project addresses the fundamental issues in the design of efficient feedback channels for space-time coding methods.3. Integration into wireless research platform: The strong theoretical innovations for low powerdesign are tested on the rapid prototyping platform for multiple antenna systems at Rice University. The end-to-end system design and development is stress tested, and the power and spectral efficiency of the overall system is quantified.The ongoing research paves the way to understand the fundamental relationships among spectral efficiency, algorithm complexity, and power consumption to increase the utility of wireless capable mobile devices and to directly impact their emerging market. The broader impact of the project on education is ensured by engaging a large number of undergraduate and graduate students in projects in our laboratory.