Link layer transmission techniques for multiple input multiple output MIMO-based future wireless networks

多输入多输出（MIMO）是下一代无线网络的选择技术，这是被广泛接受的，因为它通过使用多个发射和接收天线来提供高频谱效率。迄今为止，MIMO研究项目主要集中在物理传输和编码技术，而MIMO系统的新的空间范例可以被利用来提高更高级别（层）的性能。缺乏适于与MIMO编码技术一起有效使用的较高层算法被认为是对无线网络中MIMO实现的限制。由MIMO引入的新的资源空间维度为重新设计用于单用户和多用户无线系统的链路级传输技术带来了新的挑战。在这项研究计划中，理论上的性能界限将进行调查和新的链路控制协议和多址接入机制适用于下一代MIMO无线网络将开发。更具体地，将探索（i）差错控制、（ii）介质访问控制、（iii）资源分配和（iv）具有呼叫准入控制和服务质量（QoS）保证的调度的功能。新的跨层信道感知QoS为基础的传输算法，旨在优化帧（链路级数据单元）级的性能，将提出和评估，分析和模拟，不同的MIMO物理编码技术。分集复用权衡的理论研究也将被执行，以考虑传输延迟的情况下，ARQ重传系统的单用户以及多用户系统的多用户分集的影响。该计划将更好地理解MIMO技术在高层的影响，并将提出理论和实际的链路控制解决方案，以提高全球系统性能。因此，它有助于解决在无线网络中实现MIMO技术的工业问题。由此产生的知识产权将转移到加拿大产业，并帮助他们处于商业MIMO无线网络产品开发的前沿。

It is widely accepted that Multiple Input Multiple Output (MIMO) is a technology of choice for next generation wireless networks as it provides high spectral efficiency by using multiple transmit and receive antennas. To date, MIMO research projects mainly focus on physical transmission and coding techniques while the new spatial paradigm of MIMO systems can be exploited to improve the performances at higher levels (layers). The lack of higher layers algorithms adapted to be efficiently used with MIMO coding techniques is considered a limitation on the implementation of MIMO in wireless networks. The new spatial dimension of resources introduced by MIMO creates new challenges for re-designing the link level transmission techniques for single-user and multi-user wireless systems. In this research program, theoretical performance bounds will be investigated and new link control protocols and multiple access mechanisms applicable to next generation MIMO wireless networks will be developed. More specifically, the functionalities of (i) error control, (ii) medium access control, (iii) resource allocations, and (iv) scheduling with call admission control and Quality of Service (QoS) guarantees providing will be explored. New cross-layer channel-aware QoS-based transmission algorithms that aim to optimize the frame (link level data unit) level performances will be proposed and evaluated, analytically and by simulations, for different MIMO physical coding techniques. The theoretical study of diversity-multiplexing trade-off will be also performed to consider the transmission delay in the context of ARQ retransmission system for single-user as well as for multi-user systems with the impact of multi-user diversity. This program will give better understanding of the impact of MIMO technology at the higher layers and will propose theoretical and practical link control solutions to improve the global system performances. Thus, it contributes to resolve the industrial problem of implementing MIMO technology in wireless networks. The resulting intellectual property will be transferred to Canadian industries and helping them to be at the front position for the development of commercial MIMO wireless networks products.