Ultra Wideband Communications based on Massive MIMO and Multi-mode Antennas Suitable for Mobile Handheld Devices
Research grant by DFG (German Research Foundation) research focus area SPP 1655:
DFG MA 4981/4-1 and HO 2226/14-1
Ultra-high-speed wireless communications with peak data rates of 100 Gbps and beyond, as targeted in the DFG research focus area SPP 1655, requires an ultra-wide signal bandwidth in conjunction with suitable antennas and advanced baseband processing techniques to increase spectral efficiency and power efficiency simultaneously. In this project proposal, additional constraints arise as our focus is on low-cost low-complexity miniature consumer electronic devices, such as ultrabooks, tablet PCs or smart phones. Both downlink and uplink will be studied, and limited mobility shall be supported. Emphasis is on indoor scenarios.
In order to achieve these goals, interdisciplinary research shall be conducted in the area of antenna design and baseband processing. We concentrate on the frequency range of 6.0 - 8.5 GHz, where the spectral mask is most relaxed in Europe (-41.3 dBm/MHz EIRP). Hence, a spectral efficiency of at least 40 bps/Hz must be achieved, with is a rather challenging goal with respect to miniature devices.
There are two main key concepts to achieve this goal: A novel antenna design and an advanced signal processing concept called massive MIMO. Concerning the antenna design, the new feature is that multiple modes can be activated per antenna element. Each mode owns an individual antenna port. Hence, many antenna ports can be realized given just a few antenna elements. This concept can be integrated well into miniature devices and it is easily reconfigurable.
Concerning baseband processing, the main focus is on a transmitter design supporting the flexibility offered by the antennas, as well as an advanced, highly parallel receiver design enabling low-cost implementation. The limited EIRP, the demanding bandwidth efficiency, as well as the small size and limited computational complexity of the mobile terminal are among the biggest challenges. In massive MIMO, the access point (AP) is equipped with a vast number of antenna elements, whereas the terminal is equipped with a single antenna, preferably.
UWB massive-MIMO MB-OFDM with transmitter-side beamforming shall be addressed for the downlink. Assuming for example an array with 5 x 5 antenna elements as a design guideline, each supporting 5 modes, 125 antenna ports will result at the AP. In the uplink, UWB massive-MIMO MB-OFDM with diversity reception shall be investigated. On the terminal side, one antenna element with 5 modes will result in 5 antenna ports. In this interdisciplinary approach targeting ultra-high bandwidth efficiencies, the first three project years will focus on fundamental questions.
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