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On the Impact of Residual Inter-Subchannel Interference for the Single-Carrier Block Transmission

Authors:
Ming-Xian Chang
Tzy-Yu Wu

Keywords: OFDM, ICI, SC-FDE

Abstract:
In the fast time-varying channel, there exists interference among subchannels for the orthogonal frequency-division multiplexing (OFDM) system. The problem of inter-subchannel interference (ICI) also appears in the single-carrier (SC) block transmission with frequency-domain equalization (FDE). There are several ICI reduction algorithms for the OFDM system, and some of these algorithms can be applied in the SC-FDE system. On the other hand, unlike the scenario of carrier-frequency offset, the ICI caused by the time-varying mobile channel cannot be completely removed, and the residual ICI exists after the ICI reduction. In this paper, we analyse the effect of residual ICI. We show that the impacts of the residual ICI on the OFDM system and the SC-FDE system are quite different. For the SC-FDE system, the residual ICI incurs the “error rising” when we detect the time-domain symbols after the frequency-domain equalization. The error-rising effect is worse than the error-floor effect. To avoid the error-rising effect caused by the residual ICI, one can apply the maximum-likelihood (ML) detection, or its complexity-reduced schemes, like the K-Best algorithm. The simulation results verify our analysis.

Pages: 35 to 39

Copyright: Copyright (c) IARIA, 2016

Publication date: November 13, 2016

Published in: conference

ISSN: 2308-4219

ISBN: 978-1-61208-514-2

Location: Barcelona, Spain

Dates: from November 13, 2016 to November 17, 2016