WLC01-6: MIMO Zero-forcing Equalizer for BFDM/OQAM Systems in the Highly Mobile Environments

Pulse-shaping OFDM is well-known that it performs well in a mobile environment comparing with conventional OFDM. However, in highly mobile environment intersymbol and intercarrier interferences (ISI/ICIs) increase and can no longer be neglected. These ISI/ICIs deteriorate the performance of the systems. Proper channel equalization is needed for further improvement of the systems. In this paper, more general case, namely biorthogonal frequency division system based on offset QAM (BFDM/OQAM) is considered. We propose a multi-input multi-output (MIMO) transversal filter to equalize the time- frequency dispersive channel. Tap weights are calculated using the zero-forcing (ZF) algorithm. We also propose maximum- likelihood channel estimator and its low-complexity version. The proposed system can significantly improve the performance of BFDM/OQAM systems in the highly mobile environment.