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A MIMO system with reciprocal transceivers for the time-division duplex mode

: Jungnickel, V.; Krüger, U.; Istoc, G.; Haustein, T.; Helmolt, C. von

IEEE Antennas and Propagation Society; International Union of Radio Science -URSI-, US National Committee:
IEEE Antennas and Propagation Society International Symposium 2004. Digest. Vol.2 : June 20 - 25, 2004, Monterey, California; Held in conjunction with USNC/URSI National Radio Science Meeting
Piscataway, NJ: IEEE Operations Center, 2004
ISBN: 0-7803-8302-8
National Radio Science Meeting <2004, Monterey/Calif.>
IEEE Antennas and Propagation Society (International Symposium) <2004, Monterey/Calif.>
Fraunhofer HHI ()

For the application of advanced smart antenna and MIMO techniques as joint transmission, channel inversion and Tomlinson-Harashima pre-coding in future radio systems, channel side information is required at the transmitter. In the time-division duplex mode, the reciprocal channel coefficients estimated in the up-link may in principle be reused in the down-link. In practice, the reciprocity must not be limited to the radio frequency channel between the antennas but it should be available also at the transceiver interfaces to the baseband signal processing. Here we propose a new transceiver design suitable for the application of these advanced techniques.