Evaluation of Encoded MU-MISO-OFDM Systems in TDD Mode with Non-ideal Channel Reciprocity

Autoren: M. Petermann, D. Wübben, K.-D. Kammeyer
Kurzfassung: 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.
Dokumenttyp: Konferenzbeitrag
Veröffentlichung: Siegen, Deutschland, 18. - 21. Januar 2010
Konferenz: 8th International ITG Conference on Source and Channel Coding (SCC 2010)
scc2010_full_paper.pdf177 KB
Zuletzt aktualisiert am 22.01.2010 von M. Petermann
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