Adaptive equalization of time-varying MIMO channels

Authors:
Mihai Enescu;Marius Sirbu;Visa Koivunen
Affiliations:
Signal Processing Laboratory, SMARAD CoE, Helsinki University of Technology, PO Box 3000, FIN-02015 HUT, Finland;Signal Processing Laboratory, SMARAD CoE, Helsinki University of Technology, PO Box 3000, FIN-02015 HUT, Finland;Signal Processing Laboratory, SMARAD CoE, Helsinki University of Technology, PO Box 3000, FIN-02015 HUT, Finland
Venue:
Signal Processing - Content-based image and video retrieval
Year:
2005

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Abstract

This paper addresses the problem of adaptive multiple-input multiple-output (MIMO) equalization of time-varying channels (TVC).The proposed technique is based on Kalman filtering and decision feedback equalization. The time-varying channels can be estimated and tracked using a Kalman filter type of algorithm. An equalization technique for MIMO channels is derived based on a novel decision feedback equalizer structure. Moreover, we present a method to estimate the measurement and state noise variances used by the Kalman filter because they are crucial parameters in obtaining a reliable performance.The performance of the algorithm is investigated in simulations using realistic channels generated based on the COST 207 model. The results show that the algorithm performs well even in low SNR conditions or in difficult channel conditions.