CAREER: Coded Modulation for High-Speed Wireless Communications

现代通信的主要目标之一是开发一个系统，为用户提供高速无处不在的信息访问。 这样的系统需要无线组件;然而，由于可用带宽的有限量以及由于无线环境固有的多径而引起的信号衰落，无线组件可能是系统的瓶颈。 因此，通信研究界被要求提供多径衰落信道上的带宽有效通信的重点研究，并教育学生，使他们有必要的技能，为这个和未来的系统作出贡献。 如下所述，该项目通过以下方式解决这些问题：（1）用于高速无线系统的编码调制的进展，（2）用于高速无线系统的物理层的系统架构的比较，（3）在学生教学中广泛适用的创新，和（4）通信理论本科研究计划。正在考虑的两个主要架构，为未来的高-高速无线通信系统是在接收机处采用判决反馈均衡器（DFE）的编码单载波系统和编码正交频分复用（OFDM）系统。 在本计画中，针对OFDM系统的编码调变设计问题进行了正式的研究。 通过在频域编码调制（FDCM）的更一般的框架中观察这个问题，正在开发设计规则，其导致相对于传统OFDM系统可以有效地权衡复杂度以改善误比特概率和放大器效率的系统。 此外，该项目正在分析所产生的系统作为采用DFE的编码单载波系统和编码OFDM系统之间的混合的效用;这提供了高速无线通信的最广泛考虑的系统架构的统一比较。 该项目的教育部分采用三种互补的方法，努力通过创新来促进学生的学习，补充传统的课堂教学。 第一种方法是继续引入支持传统课程主动学习的补充，例如在本科概率课上引入课程积分的机会游戏。 第二种方法将是开发一个顶点无线通信课程，使研究生和高级本科生能够在强调整体系统性能的面向团队的环境中整合他们在各种通信系统组件方面的知识。 最后，第三种方法将是继续资助本科研究计划，通过在活跃的研究环境中提供一对一的关注来帮助有前途的本科工程师。

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.