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Implementation of adaptive channel inversion in a real-time MIMO transmission system


IEEE Communications Society:
IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2004. Proceedings. Vol.4 : Barcelona, Spain, 5 - 8 September 2004, Hotel Princesa Sofia
Piscataway, NJ: IEEE, 2004
ISBN: 0-7803-8523-3
International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) <15, 2004, Barcelona>
Fraunhofer HHI ()

The implementation of adaptive channel inversion into a real-time single carrier MIMO test-bed is reported for the first time. Since no joint detection is possible at the distributed users all signal preprocessing is performed at the transmitter which adapts the trans-mission links to all mobile terminals adaptively depending on the actual channel situation. By this means the number of reliably supportable users is controlled as well as the modulation, ensuring BER targets for all users. The implemented algorithms are described and measurement results show stable sum rate throughput of several 10 Mbit/s for a MIMO base station with 4 transmit antennas which supports up to 4 mobile terminals simultaneously. Since the transmission is based on optimum feedback of the channel knowledge to the transmitter the results given here can be understood as a kind of an upper practical performance bound for the application of linear channel pre-distortion.