author = {M. Petermann and D. W\"{u}bben and K.-D. Kammeyer},
  year = {2010},
  month = {Jan},
  title = {Evaluation of Encoded MU-MISO-OFDM Systems in TDD Mode with Non-ideal Channel Reciprocity},
  URL = {http://www.scc2010.net},
  address={Siegen, Germany},
  abstract={In multi-user orthogonal frequency division multiplexing (MU-OFDM)
systems operating in time division duplex (TDD) mode downlink
pre-equalization can be applied relying on channel state information
(CSI) from the uplink direction. Unfortunately, the prerequisite of
channel reciprocity is usually not fulfilled due to non-reciprocal
transceivers. Hence, this paper deals with a comparison of robust
pre-equalization schemes and a calibration approach to enhance the
necessary uplink-downlink "link equivalence" for MU-MISO-OFDM systems
applying linear and non-linear pre-equalization techniques and strong
forward error correction (FEC). Performance evaluations concerning
coded bit error rate results show that robust pre-equalizers
exclusively improve the performance in moderate non-reciprocity
conditions. In contrast, only calibration helps in dealing with severe
transceiver mismatch.
  booktitle={8th International ITG Conference on Source and Channel Coding (SCC 2010)}