高谱效高能效多用户协作通信技术的研究

Modern wireless communication networks provide pervasive information services. Cooperative communication that motivates network users to collaborate for signal transmission is a crucial technology to realize reliable and efficient communications. It is a flexible communication mechanism, creating multi-path signal transmission and hence introducing diversity gains for the communication system. It also enables the network resources to be better utilized and improves the network coverage. Therefore, it plays an important role in many areas, including commercial and military communications and disaster managements. However, multi-user cooperative communication is at the expenses of spectral efficiency, energy consumption and information routing. Aiming to solve those challenges, this project investigates the spectrum and energy efficient communication technologies for multi-user cooperative networks. This project proposes the message partitioning based cooperative communications (MPBCC) and the nonorthogonal opportunistic cooperative communications (NOCC) schemes, both of which achieve a high spectrum efficiency and alleviate the energy consumption. Information theoretic performance of the two communication schemes will be analyzed as well as their spectrum and energy efficiencies. Design of channel codes for the cooperative channels will be proposed. In order to provide reliable communications, yet maintaining high throughput and spectral efficiency, this project will also investigate the design of network-channel-coded modulation (NCCM) scheme that integrates the network coding, channel coding and coded modulation as a single entity. Its applications for multi-user cooperative networks will be further explored. This research project can provide the key technologies for realizing spectrum and energy efficient signal transmission in the next generation wireless communication networks.

现代无线通信网络提供了广泛的信息服务，要实现高效可靠的信号传输，网络用户间的协作通信是一种必要的手段。多用户协作是一种灵活的通信机制，通过用户间的协作重传，实现信号的多路径传输，带来分集增益。协作通信使网络资源得到更充分的调配与共享，有效地提高了网络覆盖率，在民用通信、军事通信和应急救灾等方面发挥着积极的作用。然而，多用户协作通信是以影响用户的频谱效率、网络能耗和信号路由等问题为代价的。针对这些挑战，本项目将研究高谱效和高能效的多用户协作通信技术。项目将提出基于信息分段的协作通信和非正交机会式协作通信两种高谱效高能效的多用户协作机制，分析其理论性能、谱效增益和能效增益，提出能充分获取信道分集的纠错编码设计方案。为了提高网络吞吐量，项目还将研究网络-信道-编码调制的联合设计，实现在网络编码协作中的高谱效传输。本项目的研究为在下一代无线通信网络中实现高谱效和高能效的信号传输提供了关键的技术。

本项目按计划完成了申请书所提出的研究内容。通过四年的研究，本项目所取得的研究成果主要包括四个方面：第一，研究了双向中继信道中迭代检测-译码及线性物理层网络编码，解决了双向中继通信中的高谱效高能效传输问题。第二，研究了Reed-Solomon (RS) 码和Algebraic-Geometric (AG) 码的低复杂度代数译码，为其工业化应用注入“催化剂”。第三，设计中短码长的Low Density Parity-Check (LDPC) 分组码，并分析其在不同信道下的性能。第四，针对空间耦合LDPC码的设计及其译码优化，提出了系统的构造方法以及更优的译码方案。这些工作都在信息编码和通信理论领域的顶级期刊或会议发表，目前该项目已发表SCI期刊文章8篇，EI文章（IEEE国际会议）13篇，申请了2项国家发明专利。项目资助参加国际会议8人次，国内学术会议15人次。项目负责人曾获得中国电子学会信息论分会信息论青年新星。另外，项目负责人多次受邀到国内外知名大学就所研究的内容做学术报告，包括美国Notre Dame大学，德国Ulm大学，清华大学，香港中文大学等。