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MIMO Zero-Forcing Equalizer for BFDM/OQAM Systems in Time-Frequency Dispersive Channels Bayarpurev MONGOL Takaya YAMAZATO Hiraku OKADA Masaaki KATAYAMA Publication IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Vol.E89-A No.11 pp.3114-3122 Publication Date: 2006/11/01 Online ISSN: 1745-1337 DOI: 10.1093/ietfec/e89-a.11.3114 Print ISSN: 0916-8508 Type of Manuscript: Special Section PAPER (Special Section on Wide Band Systems) Category: Keyword: pulse-shaping OFDM, BFDM/OQAM, ISI/ICI, MIMO zero-forcing equalizer, Full Text: PDF(542.9KB)>>
Summary: 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. | ||||||||||
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