蜂窝网络中D2D 通信的关键技术研究

The device-to-device (D2D) communication underlaying a cellular network to share the same resources flexibly and efficiently, can increase the spectral efficiency and data rate, as well as provide cellular users with new service opportunities. As such, the advantages of D2D communications are manifold: reduced users' battery consumption, offloading the cellular network, also robustness to infrastructure failures. In this project, D2D communication as an underlay to a cellular network will be studied to develop the optimization theory and performance analysis of the distribuitive transmission including the technologies of relay-based and multi-user cooperation and multiple virtual antennas etc., which will also aim to propose the effective mechanism to coordinate interference. Some of the techniques required to enable the D2D operation are as following. In order to combat the intereference of D2D connections to the cellular networks over the shared resources, the network models according to the characteristics of the various intereference scenarios will be complemented, and then the schemes to minimize the interference will be presented by exploiting the distributed space-time coding, the power control and the multi-user diversity. Moreover, considering the complex topology comprised of multi-user and multi-relay cooperation by clustering, and under the conditions of the statistic information and mobility of the channel, the robust optimization processing algorithms will be proposed with the tradoff of the performance and the complexity. At last, the expressions in terms of the close form and tight upper or lower bound of the system performance will be derived for the present strategy under various networks and channel models to investigate the underlying operations.

终端直通（Device-to-Device，D2D）通信通过灵活有效地接入蜂窝网共享其无线资源，能提高系统频谱利用率和数据传输速率，并且为蜂窝网提供新的通信业务。D2D通信还具有减少用户功耗、减轻蜂窝网络负载，以及减少网络基础设施故障的鲁棒性等优点。本项目拟围绕蜂窝网络中的D2D 通信，深入研究其引入中继协作、多用户协作和虚拟多天线等分布式传输技术的优化理论和性能分析，并发展高效的抗干扰技术和方法。针对D2D 通信与蜂窝网之间的干扰抑制，根据不同干扰环境的本质特征合理构建干扰网络模型，提出抗干扰的分布式空时编码方案和联合功率控制的多用户干扰协调技术；针对用户成簇下多用户、多中继协作的复杂拓扑网络，考虑信道的统计信息和移动性，提出高性能与低复杂度相平衡的优化鲁棒处理算法；在不同网络模型和信道特征下根据所采取的技术方案推导其性能的闭式解和较复杂情况下紧致的上下界，对系统性能进行深入分析。

本项目以蜂窝D2D通信系统为研究对象，对该系统的干扰控制技术、协作传输技术、大规模MIMO技术和信号检测技术等重要方面进行了深入研究。.首先，针对D2D用户与蜂窝用户共享上行频谱信道的蜂窝D2D通信系统，借助协作通信、预编码等技术，根据不同干扰环境的特征合理构建系统模型，深入分析系统的干扰功率和中断性能，进而通过中继选择、功率分配、波束赋形等方法实现干扰的有效抑制，从而降低中断概率。此外，还针对基于正交频分复用多址的蜂窝D2D系统，以公平性为原则设计了和速率最大化的用户调度机制。.其次，针对中继辅助的D2D通信系统，提出了高自由度的中继转发方式，并在考虑电路模块功率消耗的前提下提出了高能效的部分中继选择方案，同时还以系统安全性为目标，分析了不同中继传输方案的安全性能，提出了高安全性的波束赋形方案和功率分配方案。.再次，针对一个具有大规模天线阵列的中继协助D2D用户对进行通信的场景，分析了系统在多径衰落、路径损耗和阴影衰落影响下的渐近容量，在相位噪声、信道老化影响下的频谱效率、中断概率等，并在此基础上研究了系统的功率缩减法则。.最后，本项目针对多天线D2D通信对的接收端，研究了干扰消除检测、线性检测等各种信号检测技术，利用置换矩阵、幺模矩阵对信号进行预处理，分析了影响检测算法差错概率与计算复杂度的各种因素，提出了降低复杂度但不降低精度以及提高精度但复杂度仍可接受的新检测算法。.本项目顺利完成了预期的研究，并取得了一系列获得国内外认可的成果，为无线通信先进技术的发展和广泛应用提供了理论依据和技术支持。

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