MIMO Zero-Forcing Equalizer for BFDM/OQAM Systems in Time-Frequency Dispersive Channels

  • Authors:

  • Bayarpurev Mongol;Takaya Yamazato;Hiraku Okada;Masaaki Katayama

  • Affiliations:

  • The author is with the Department of Electrical Engineering and Computer Science, Graduate School of Engineering, Nagoya University, Nagoya-shi, 464-8603 Japan. E-mail: mongol@katayama.nuee.nagoya ...;The authors are with EcoTopia Science Institute, Nagoya University, Nagoya-shi, 464-8603 Japan.,;The author is with the Center for Transdisciplinary Research, Niigata University, Niigata-shi, 950-2181 Japan.;The authors are with EcoTopia Science Institute, Nagoya University, Nagoya-shi, 464-8603 Japan.,

  • Venue:
  • IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
  • Year:
  • 2006

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Abstract

Pulse-shaping OFDM is well-known that it performs well in a mobile environment compared with conventional OFDM. However, in a 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, a 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.