宽带多制式光载无线接入系统中干扰消除及性能优化技术研究

With the diversity of users’ demands and the growth of various broadband traffic increases rapidly, the higher requirements for the bandwidth of backbone network and access network are proposed. Therefore, in this project we innovatively research on the theory and application for the key problems in the next generation access network with high capacity, low cost, multi-service and wide coverage, and propose the scheme of the interference elimination and performance optimization technology for the broadband multi-service optical carrier radio over fiber (ROF) access system. In this project, we will establish the joint channel model for the access network system using the transfer matrix method, and study the effects of the various factors on the performance of broadband multi-standard ROF access system. Based on the memory polynomial model and the adaptive algorithm, we propose the scheme of linear lifting for the multi-standard ROF access system; furthermore, we study the same frequency interference suppression technology based on the adaptive power allocation to solve interference damage problem for the multi-standard ROF broadband access system; The adaptive encoding algorithm is studied and the signal feedback scheme for dynamic access system is proposed, and the method for solving the problem of system interference is given. Finally we will combine the theoretical analysis and experimental verification to establish a set of the performance optimization and lifting scheme for the next generation broadband optical carrier wireless access system, which will provide the theoretical and technical support for future dynamic and flexible ROF access network construction with wideband, multi-service and wide coverage.

随着用户需求的多样化和各种宽带业务流量的急剧增加，这就对宽带大容量骨干网和接入网提出了更高要求。本项目围绕下一代大容量、低成本、多业务、广覆盖的接入网中的关键问题展开理论和应用的创新性研究，提出了宽带多制式光载无线（ROF）接入系统中干扰消除及性能优化技术的研究方案。本项目采用传输矩阵法建立了系统的联合信道模型，研究传输链路中的各种因素对宽带多制式ROF接入系统的影响；结合记忆多项式和自适应算法，提出了多制式ROF接入系统的线性化提升方案；研究基于功率自适应分配的同频干扰抑制技术，解决宽带多制式ROF接入系统中的干扰问题;研究自适应编码算法，创新性提出动态接入系统的信号反馈方案，并给出解决系统干扰问题的方法。最后结合理论分析和实验验证，建立一套适用于下一代宽带光载无线接入系统的性能优化及提升方案，为未来宽带多业务、广覆盖、动态灵活的光无线融合接入网络建设奠定理论和实验基础。

本项目围绕下一代大容量、低成本、多业务、广覆盖的接入网中的关键问题展开理论和技术的研究，提出了宽带多制式光载无线（ROF）接入系统中干扰消除及性能优化技术的研究方案。主要成果如下：建立多制式传输系统的信道模型，研究了非线性、光纤色散及无线信道的各种衰落效应对传输性能影响，实现了数学模型的建立。建立基于广义频分复用的宽带多制式光载射频系统模型，分析了激光器发射功率、接收机不同滤波器等因素对传输系统的影响。提出了基于广义频分复用的新型级联编码调制方案，该方案具有低复杂度并且提供高频谱效率和显著的编码增益。研究基于功率自适应分配的同频干扰抑制技术，提出基于软频率复用和基站协作的小区间干扰协调方案，实现小区间最有效的动态干扰抑制技术。研究了基于子载波分组的联合自适应调制算法，该算法在初始比特分配和后继比特调整和功率分配中以子载波组为最小单元，实现了对系统干扰抑制，降低算法的运算复杂度。提出了高编码增益速率自适应多级编码调制方案、基于GFDM-ROF系统的级联Turbo-STBC编码调制方案和灵活自适应的非均匀高阶调制方案，进一步提高了宽带多制式光载无线接入系统的传输性能。在此研究基础上，课题组发表高水平学术论文8 篇，申请发明专利4项，培养研究生5名。