Adaptive relay transmission for ubiquitous gigabit wireless communications

虽然无线通信产业在过去的三十年里经历了一个前所未有的令人兴奋的发展时代，但提供与有线系统相同的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。超第四代（B4 G）无线系统的主要设计目标是向系统中的每一个合格用户递送每秒数吉比特量级的极高数据速率服务。拟议的研究计划将开发重要的尖端技术，使无处不在的千兆无线接入。我们将设计有效的传输方案，通过优化整合先进的点对点传输技术，如自适应传输和接收技术，多天线传输和接收（MIMO）技术和跨层调度技术，与合作/多跳中继技术。具体而言，将积极开展以下三大研究方向。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系统的高效调度和信令方案的设计和分析，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性质需要高系统效率的自适应实现。因此，我们将开发创新的中继/多跳传输链路的自适应信令方案。最后，无线系统有限资源的有效利用要求协议栈中不同层的操作要适当地协调。我们也将探讨在不同层次的各种自适应机制的最佳联合设计，以经济有效地提供所需的高质量的传输服务，在多跳无线链路。由此产生的多跳多天线自适应传输涉及多个层将提供一个有吸引力的新的解决方案，极高速率的无线传输。

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.