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PHY 51-3 - Realtime multi-user multi-antenna downlink measurements

: Wirth, T.; Jungnickel, V.; Forck, A.; Wahls, S.; Gäbler, H.; Haustein, T.; Eichinger, J.; Monge, D.; Schulz, E.; Juchems, C.; Luhn, F.; Zavrtak, R.


Institute of Electrical and Electronics Engineers -IEEE-:
IEEE Wireless Communications and Networking Conference, WCNC 2008. Conference proceedings : 31 March - 3. April 2007, Las Vegas, Nevada, USA
Piscataway, NJ: IEEE, 2008
ISBN: 978-1-4244-1997-5
ISBN: 978-1-4244-1996-8
Wireless Communications and Networking Conference (WCNC) <2008, Las Vegas/Nev.>
Conference Paper
Fraunhofer HHI ()
3G mobile communication; access protocols; adaptive modulation; broadband antenna; closed loop system; mobile antenna; telecommunication control; wireless channel

In this paper, we present real-time broadband multi-user multi-antenna measurements in typical indoor and outdoor scenarios. For the first time, essential frequency-selective functions of a new medium access control (MAC) layer, namely fair resource assignment to multiple users, spatial mode selection and adaptive modulation, have been implemented in real-time on standard digital signal processing hardware. The new MAC layer is steered over wireless feedback and control channels in a closed loop manner. Our implementation uses parameters close to the forthcoming long-term evolution (LTE) of the 3G air interface, thus illustrating the feasibility of the new functions in next-generation cellular radio systems. The paper describes our real-time implementation and reports several test results. Benefits of the frequency-selective multi-user MIMO MAC are validated in realistic mobile propagation environments.