Chair of Information and Coding Theory

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.


  1. Y. Chen, R. Martens, R. Valkonen, and D. Manteuffel, "Evaluation of adaptive impedance tuning for reducing the form factor of handset antennas," IEEE Trans. Antennas Propagat., vol. 63, no. 2, pp. 703–710, Feb. 2015. DOI
  2. N. Doose and P. A. Hoeher, "Joint precoding and power control for EIRP-limited MIMO systems," submitted for publication to IEEE Trans. Wireless Comm., 2015.
  3. N. Doose, P. A. Hoeher, "Massive MIMO Ultra-Wideband Communications Using Multi-Mode Antennas," in Proc. 10th International ITG Conference on Systems, Communications and Coding (SCC), Hamburg, Germany, Feb. 2015. URL
  4. N. Doose and P. A. Hoeher, "On EIRP control in downlink precoding for massive MIMO arrays," in Proc. Int. ITG Workshop on Smart Antennas (WSA), Munich, Germany, Mar. 2016. URL
  5. M. Damrath, P. A. Hoeher, and G. J. M. Forkel, "Piecewise linear detection for direct superposition modulation," Digital Communications and Networks, 2017. DOI
  6. M. Damrath, P. A. Hoeher, and G. J. M. Forkel, "Symbol detection based on Voronoi surfaces with emphasis on superposition modulation," Digital Communications and Networks, 2017. DOI
  7. N. Doose, P. A. Hoeher, "On the Performance of High-Rate LDPC Codes with Low-Resolution Analog-to-Digital Conversion," accepted for publication in Proc. IEEE Vehicular Technology Conf. (VTC Fall), Toronto, Canada, Sep. 2017.
  8. N. Doose, "EIRP-limited beamforming for massive MIMO systems," in Proc. ITG Fachtagung Angewandte Informationstheorie, Stuttgart, Germany, Oct. 2015.
  9. P. A. Hoeher, N. Doose, "A massive MIMO terminal concept based on small-size multi-mode antennas," Trans. Emerging Telecommunications Technologies, vol. 28, no. 2, Feb. 2017, published online March 2015. DOI
  10. P. A. Hoeher, D. Manteuffel, N. Doose, N. Peitzmeier, "Ultra-Wideband Massive MIMO Communications Using Multi-Mode Antennas," Frequenz, Aug. 2017.  DOI
  11. T. Hadamik, R. Martens, and D. Manteuffel, "Systematic broadband multiport antenna design based on a characteristic mode analysis," in Proc. 6th COST IC1102 WG Meeting & Technical Workshop, Madrid, Spain, Oct. 2014.
  12. T. Hadamik, R. Martens, and D. Manteuffel, "MIMO antenna concept based on Characteristic Modes for indoor base stations," in Proc. European Conf. on Antennas Propagat. (EUCAP), Lisbon, Portugal, Apr. 2015. URL
  13. D. Manteuffel, "Characteristic mode based antenna design – a straight forward approach to small form factor antenna integration," in Proc. European Conf. on Antennas Propagat. (EUCAP), Invited Paper, Lisbon, Portugal, Apr. 2015. URL
  14. D. Manteuffel, "Compact multi mode massive MIMO antennas," in Proc. IEEE Int. Workshop on Antenna Technology (iWAT), Invited Paper, Seoul, South Korea, Mar. 2015.
  15. D. Manteuffel, N. Doose, P. A. Hoeher, "Evaluation of a Compact Antenna Concept for UWB Massive MIMO," presented at German Microwave Conference (GeMiC), Bochum, Germany, Mar. 2016.
  16. R. Martens, J. Holopainen, E. Safin, J. Ilvonen, and D. Manteuffel, "Optimal dual-antenna design in a small terminal multi-antenna system," IEEE Antennas Wireless Propagat. Lett., vol. 12, pp. 1700–1703, Dec. 2013. DOI
  17. R. Martens and D. Manteuffel, "Systematic design method of a mobile multiple antenna system using the theory of characteristic modes," IET Microwaves, Antennas & Propagation, vol. 8, pp. 887–893, Sep. 2014. DOI
  18. D. Manteuffel and R. Martens, "Compact multimode multielement antenna for indoor UWB massive MIMO," IEEE Trans. Antennas and Propagat., vol. 64, no. 7, pp. 2689–2697, Jul. 2016. DOI
  19. E. Safin and D. Manteuffel, "Reconstruction of the characteristic modes on an antenna based on the radiated far field," IEEE Trans. Antennas Propagat., vol. 61, no. 6, pp. 2964–2971, Jun. 2013.  DOI
  20. Safin, E. and Manteuffel, D., "Manipulation of characteristic wave modes by impedance loading," IEEE Trans. Antennas Propagat., vol. 63, no. 4, pp. 1756–1764, Apr. 2015. DOI