Authors: |
M. Petermann, D. Wübben, K.-D. Kammeyer |
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.
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Document type: |
Conference Paper |
Publication: |
Siegen, Germany, 18. - 21. January 2010 |
Conference: |
8th International ITG Conference on Source and Channel Coding (SCC 2010) |
Files: |
BibTEX
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