Performance of Downlink Spatial-Multiplexing in Realistic Urban Multi-User MIMO Channels

• Published in: IEEE Vehicular Technology Conference pp. 1 - 5
• Main Authors: Fugen, T., Porebska, M., Wiesbeck, W.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01.09.2006
• Subjects: Array signal processing; Cities and towns; Costs; Downlink; Frequency division multiaccess; MIMO; Multiaccess communication; Power system modeling; Ray tracing; Time division multiple access
• ISBN: 9781424400621; 1424400627
• ISSN: 1090-3038; 2577-2465
• DOI: 10.1109/VTCF.2006.91

In this paper the performance of user specific beamforming, waterfilling, block diagonalization, and successive optimization is compared to the performance of a conventional SISO reference system in a single cell with a sectorized BS and several MTs. Whereas in the SISO reference system as well as in the beamforming and waterfilling algorithm the MTs are multiplexed by a conventional multiplexing method (TDMA, FDMA, CDMA) the two multi-user MIMO algorithms allow users to share the same spectrum by multiplexing them in space. Several multi-user scenarios are generated by means of a realistic urban channel model. The channel model incorporates a model of the city of Karlsruhe, a mobility model as well as a ray-tracing based wave propagation model. Simulation results show clearly the potential of downlink spatial-multiplexing to improve the system capacity, to reduce the exposure (power density) and to reduce the transmit power and therefore the operating costs in future cellular mobile radio systems.