CAREER: Coded Modulation for High-Speed Wireless Communications

现代通信的主要目标之一是开发一种向用户提供高速、无处不在的信息访问的系统。这样的系统需要无线组件；然而，由于可用的带宽有限，并且由于无线环境固有的多径而导致信号衰落，无线组件可能成为系统的瓶颈。因此，通信研究界被要求对多径衰落信道上的带宽高效通信进行重点研究，并教育学生，使他们拥有为这个系统和未来系统做出贡献的必要技能。如下所述，该项目正在通过以下方式解决这些问题：(1)高速无线系统的编码调制的进展，(2)高速无线系统物理层的系统架构的比较，(3)学生教学中广泛适用的创新，以及(4)通信理论的本科生研究计划。正在考虑用于未来高速无线通信系统的两种主要架构是在接收器使用判决反馈均衡器(DFE)的编码单载波系统和编码正交频分多路复用(Ofdm)系统。在本项目中，正式开发了适用于ofdm系统的编码调制设计问题。通过在频域编码调制(FDCM)的更一般框架中看待该问题，正在开发设计规则，该设计规则导致系统能够有效地权衡复杂性，以相对于传统的ofdm系统提高误码率和放大器效率。此外，该项目正在分析所得到的系统作为采用DFE的编码单载波系统和编码ofdm系统之间的混合的效用；这为高速无线通信提供了最广泛考虑的系统架构的统一比较。这个项目的教育部分采用了三种互补的方法，努力通过创新来促进学生的学习，以补充传统的课堂教学。第一种方法将是继续在传统课程中引入支持主动学习的补充材料，例如在本科生概率类课程中引入机会游戏来获得课程点。第二种方法是开发一门顶峰无线通信课程，该课程将允许研究生和高级本科生在注重整体系统性能的团队导向环境中整合他们在各种通信系统组件方面的知识。最后，第三种方法是继续资助本科生研究计划，通过在积极的研究环境中提供一对一的关注来帮助有前途的本科生工程师。

One of the major goals of modern communications is to develop a system that provides users high-speed ubiquitous access to information. Such a system requires a wireless component; however, because of the limited amount of bandwidth available and the signal fading due to the multipath inherent to the wireless environment, the wireless component can be the bottleneck of the system. Thus, the communications research community is called upon to provide focused research on bandwidth efficient communications over multipath fading channels and to educate students so that they have thenecessary skills to contribute to this and future systems. As detailed below, this project is addressing these issues through: (1) advances in coded modulation for high-speed wireless systems, (2) a comparison of system architectures for the physical layer of high-speed wireless systems, (3) broadly applicable innovations in the instruction of students, and (4) a program of undergraduate research in communication theory.The two main architectures that are being considered for future high-speed wireless communication systems are a coded single-carrier system employing a decision feedback equalizer (DFE) at the receiver and a coded orthogonal frequency division multiplexing (OFDM) system. In this project, the problemof designing coded modulation for the OFDM system is being formally developed. By viewing this problem in the more general framework of frequency domain coded modulation (FDCM), design rules are being developed that lead to systems that can efficiently tradeoff complexity for improved bit error probability and amplifier efficiency relative to traditional OFDM systems. Furthermore, this project is analyzing the utility of the resulting systems as a hybrid between coded single-carrier systems employing a DFE and coded OFDM systems; this provides a unified comparison of the most widely considered system architectures for high-speed wireless communications. The educational portion of this project employs three complementary methods that strive to foster student learning through innovations that supplement traditional classroom instruction. The first method will be the continuation of theintroduction of supplements that support active learning in traditional courses, such as the introduction of games of chance for course points in an undergraduate probability class. The second method will be the development of a capstone wireless communications course that will allow graduate students and advanced undergraduates to integrate their knowledge in various communication system components in a team-oriented environment that stresses overall system performance. Finally, the third method will be the continuation of a funded undergraduate research program, which aids promising undergraduate engineers by providing one-on-one attention in an active research environment.