Interference cancellation using replica signal for HTRCI-MIMO/OFDM in time-variant large delay spread longer than guard interval

Authors:
Yuta Ida;Chang-Jun Ahn;Takeshi Kamio;Hisato Fujisaka;Kazuhisa Haeiwa
Affiliations:
Graduate School of Information Sciences, Hiroshima City University, Hiroshima, Japan;Graduate School of Engineering, Chiba University, Chiba, Japan;Graduate School of Information Sciences, Hiroshima City University, Hiroshima, Japan;Graduate School of Information Sciences, Hiroshima City University, Hiroshima, Japan;Graduate School of Information Sciences, Hiroshima City University, Hiroshima, Japan
Venue:
Journal of Electrical and Computer Engineering - Special issue on Implementations of Signal-Processing Algorithms for OFDM Systems
Year:
2012

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Abstract

Orthogonal frequency division multiplexing (OFDM) and multiple-input multiple-output (MIMO) are generally known as the effective techniques for high data rate services. In MIMO/OFDM systems, the channel estimation (CE) is very important to obtain an accurate channel state information (CSI). However, since the orthogonal pilot-based CE requires the large number of pilot symbols, the total transmission rate is degraded. To mitigate this problem, a high time resolution carrier interferometry (HTRCI) for MIMO/OFDM has been proposed. In wireless communication systems, if the maximum delay spread is longer than the guard interval (GI), the system performance is significantly degraded due to the intersymbol interference (ISI) and intercarrier interference (ICI). However, the conventional HTRCI-MIMO/OFDM does not consider the case with the time-variant large delay spread longer than the GI. In this paper, we propose the ISI and ICI compensation methods for a HTRCI-MIMO/OFDM in the time-variant large delay spread longer than the GI.