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| Organized by Prof. Mario Marques da Silva (Universidade Autonoma de Lisboa)|
|The use of multiple antennas at both the transmitter and receiver aims to improve performance or to increase symbol rate of systems, but it usually requires higher implementation complexity. The antenna spacing must be larger than the coherence distance to ensure independent fading across different antennas. Multiple Input Multiple Output (MIMO) architectures can be used for combined transmit and receive diversity, for the parallel transmission of data or spatial multiplexing.
Massive MIMO (m-MIMO) schemes involving several tens or even hundreds of antenna elements are expected to be central technologies for 5G (Fifth Generation) systems, where higher capacity and spectral efficiency are required , as compared to current systems. To avoid implementation complexity, massive MIMO schemes should use simple techniques to separate data streams that avoid matrix inversions inherent to conventional MIMO receivers. Milimeter Wave (mm-Wave) communications are expected to be a crucial part of 5G systems due to their increased channel coherence bandwidth, as compared to traditional centimeter wave. The same technological approach is utilized in the ieee 802.11 standard, as in 802.11ad. However, mm-Wave transmission has important problems like high free-space path losses, very small diffraction effects, huge losses due to obstacles and implementation difficulties, namely with the power amplification. On the other hand, the small wavelength means that we can have small antennas and small-sized antenna aggregates with a large number of elements, facilitating the deployment of m-MIMO schemes.
All new ideas about how to improve performance, capacity and/or spectrum efficiency with m-MIMO (or its applications) while keeping computational cost at an acceptable level are most welcome.|
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