Robust MIMO OFDM transmit beamformer design for large Doppler scenarios under partial CSIT

Kalyana Gopala; Dirk T. M. Slock

ICASSP 2017accepted0 citations

Robust MIMO OFDM transmit beamformer design for large Doppler scenarios under partial CSIT

Abstract

Performance of OFDM (Orthogonal Frequency Division Multiplexing) systems is limited by inter carrier interference (ICI) under high Doppler scenarios such as that encountered in high speed trains like TGV. The use of multiple receive antennas is known to be a very effective way to combat ICI. In a recent publication, the authors explored the use of transmit (Tx) antennas for ICI mitigation. It considered a MIMO (multiple input multiple output) scenario with perfect channel state information at transmitter (CSIT) and iteratively designed a transmit beamformer to maximize the sum capacity across all the subcarriers in the presence of ICI. In this paper, we make the design more robust by considering only partial CSIT knowledge. The beamformer is designed by optimizing the expected weighted sum rate (EWSR) under large MIMO asymptotics regime. The convergence of the beamformer follows easily from the design.

BibTeX

@inproceedings{icassp2017_robustmimoofdmtr,
  title = {Robust MIMO OFDM transmit beamformer design for large Doppler scenarios under partial CSIT},
  author = {Kalyana Gopala and Dirk T. M. Slock},
  booktitle = {ICASSP 2017},
  year = {2017}
}