Adaptive relay transmission for ubiquitous gigabit wireless communications

虽然无线通信行业在过去的三十年里经历了前所未有的激动人心的发展，但最终目标是提供无处不在的多媒体服务，并具有与有线系统相同的高质量，仍然需要大量的研究工作。超第四代（B4G）无线系统的一个主要设计目标是向系统中每个符合条件的用户提供每秒数千兆比特的极高数据速率服务。拟议的研究计划将为无处不在的千兆无线接入开发重要的尖端使能技术。将先进的点对点传输技术，如自适应收发技术、多天线收发（MIMO）技术和跨层调度技术与协作/多跳中继技术相结合，设计有效的传输方案。具体而言，将积极追求以下三个广泛的研究方向。首先，由于多用户MIMO传输可以有效地探索容量增益的空间自由度，我们解决了多用户MIMO系统有效调度和信令方案的设计和分析，以最大限度地从协同中继传输中获益。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提高系统效率。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，为了有效地利用无线系统有限的资源，要求协议栈中各层的操作得到适当的协调。我们还将研究不同层的各种自适应机制的最佳联合设计，以经济有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颖解决方案。

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.