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Access technologies: multiple access, multiple users, multiple distributed antenna systems (AM3) (»Add to Infobox)

Research Leader: Lars Jonsson

Electromagnetic Engineering

A joint effort by the Electrical Engineering departments of KTH/LU and our Chinese partners of BUAA/TU/HUST in the area of multiple access, multiple users, multiple distributed antenna systems. Our part under this project is to study the antennas in the IMT advanced and beyond access technologies. This includes the fundamental limitations of the array antennas in such an environment.
Multiple-Input Multiple-Output (MIMO) technology has great potential for future wireless communications in achieving high throughput and reliable transmission to multiple users utilising limited frequency spectrum resources. Existing MIMO techniques may be directly applied for cellular systems with intra-cell and inter-cell interference suppressed by frequency partition and orthogonal multiple access, not optimal in general cases. In fact, a system of multiple antennas has the capability of suppressing both the inter-cell and intra-cell interference.

Nevertheless, much research work still remains to fully exploit the freedom provided by systems of multiple antennas. An important bottleneck exists at a user terminal with multiple antennas, which is required to be simple and of small size. Consequently, the strong electromagnetic coupling and signal correlation that result from the close proximity of the multiple antennas in a small confined volume inevitably reduce the information-carrying capability of the MIMO channel. Another bottleneck is the interference which will lead to considerable performance loss. In future cellular systems, the channel quality may be hard to predict due to the bursty nature of the interference caused by packet switched data, link adaptation, varying channels, and opportunistic scheduling. This will lead to a new challenge for resource allocation and interference suppression. It is very important to develop a smart MIMO antenna system which adapts to the propagation environment and gives maximal channel quality. The spatial resources obtained by such smart systems of multiple antennas should be simultaneously designed and optimised with suitable signal processing algorithms to achieve the best overall system performance.

Future mobile systems being considered in International Mobile Communications Advanced (IMT-Advanced) require more and better use of the spatial domain, MIMO and multiple antenna solutions. The present programme deals with several aspects of MIMO access technologies for future mobile/wireless communication systems, such as multiple-antenna precoding, resource allocation, switchable multi-mode smart antenna systems, receiver processing, and optimal systems of small antennas. We will design and set up our MIMO antenna systems and propose optimal MIMO transmission strategies to fully exploit the spatial resources provided by the systems of multiple antennas. The programme consists of the following three parts:
Project 1. MIMO Transmission Strategies,
Project 2. Switchable Multi-mode Smart Antenna System,
Project 3. Optimal Antenna Systems for Small Terminals

Period: 2008-07-01 - 2011-06-30

MIMO technology, MIMO transmission strategies, Smart multiple antenna systems


VINNOVA (The Swedish Agency for Innovation Systems)


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