Adaptive relay transmission for ubiquitous gigabit wireless communications

虽然无线通信行业在过去30年中经历了一个前所未有的令人兴奋的发展时代，但提供与有线系统一样高质量的无处不在的多媒体服务的最终目标仍然需要更多的研究工作。Beyond第四代(B4G)无线系统的主要设计目标是向系统中每个符合条件的用户提供数千兆比特每秒的极高数据速率服务。拟议的研究计划将为无所不在的千兆无线接入开发重要的尖端使能技术。我们将通过将先进的点对点传输技术，如自适应发送和接收技术、多天线发送和接收(MIMO)技术和跨层调度技术，与协作/多跳中继技术最佳地结合起来，设计出有效的传输方案。具体来说，将积极开展以下三个大的研究方向。首先，由于多用户MIMO传输可以有效地探索空间自由度以获得容量增益，因此我们致力于设计和分析多用户MIMO系统的高效调度和信令方案，以最大限度地受益于协作中继传输。其次，无线传播信道和用户业务模式的时变特性需要自适应实现以获得高系统效率。因此，我们将为中继/多跳传输链路开发创新的自适应信令方案。最后，为了有效利用无线系统有限的资源，协议栈中不同层的操作必须得到适当的协调。我们还将研究不同层中各种自适应机制的最优联合设计，以经济高效地在多跳无线链路上提供所需的高质量传输服务。由此产生的涉及多层的多跳多天线自适应传输将为极高速率的无线传输提供一种有吸引力的新解决方案。

While the wireless communication industry has witnessed an unpreceded era of exciting developments over the last three decades, the ultimate goal of delivering ubiquitous multimedia services with the same high quality as wire-line systems still requires significant more research efforts. A major design objective of beyond fourth-generation (B4G) wireless systems is the delivery of extremely high data rate services, in the order of multiple gigabits per second, to every eligible users in the system. The proposed research program will develop important cutting-edge enabling techniques for ubiquitous gigabit wireless access. We will devise effective transmission schemes by optimally integrating advanced point-to-point transmission techniques, such as adaptive transmission and reception technique, multiple antenna transmission and reception (MIMO) technique and cross-layer scheduling technique, with cooperative/multihop relaying techniques. Specifically, the following three broad research directions will be actively pursued. First, as multiuser MIMO transmission can effectively explore the spatial degree of freedom for capacity gain, we address the design and analysis of efficient scheduling and signaling schemes for multiuser MIMO systems to maximally benefit from collaborative relay transmission. Secondly, the time varying nature of the wireless propagation channels and user traffic patterns entail an adaptive implementation for high system efficiency. As such, we will develop innovative adaptive signaling schemes for relay/multihop transmission links. Finally, the efficient utilization of the limited resource of wireless systems mandates the operations of different layers in the protocol stack be properly coordinated. We will also investigate the optimal joint design of various adaptive mechanisms in different layers to cost-effectively provide the desired high quality transmission service over multihop wireless links. The resulting multihop multi-antenna adaptive transmission involving multiple layers will provide an attractive novel solution for extremely high rate wireless transmission.