Joint Time-Domain Tracking of Channel and Frequency Offsets for MIMO OFDM Systems
Wireless Personal Communications: An International Journal
EURASIP Journal on Wireless Communications and Networking - Multicarrier Systems
Space-time-coded MIMO ZP-OFDM systems: semiblind channel estimation and equalization
IEEE Transactions on Circuits and Systems Part I: Regular Papers
Space-time equalization for asynchronous multiuser bit-interleaved coded OFDM
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Joint channel estimation and ISI/ICI cancellation for MIMO OFDM systems
International Journal of Ad Hoc and Ubiquitous Computing
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This paper focuses on multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems with channel order larger than the cyclic prefix (CP) length. Writing the demodulating fast Fourier transform (FFT) as a sliding FFT followed by a downsampling operation, we show in this paper that by swapping the filtering operations of the MIMO channel and the sliding FFT, the data model for the temporally smoothened received signal of each individual tone of the MIMO OFDM system is very similar to the data model for the temporally smoothened received signal of a MIMO single-carrier (SC) system. As a result, to recover the data symbol vectors, the conventional equalization approach for MIMO SC systems can be applied to each individual tone of the MIMO OFDM system. This so-called per-tone equalization (PTEQ) approach for MIMO OFDM systems is an attractive alternative to the recently developed time-domain equalization (TEQ) approach for MIMO OFDM systems. In the second part of this paper, we focus on direct per-tone equalizer design and adapt an existing semi-blind equalizer design method for space-time block coding (STBC) SC systems to the corresponding semi-blind per-tone equalizer design method for STBC OFDM systems.