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

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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.