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| For the multiple input multiple output-orthogonal frequency division multiplexing (MIMO-OFDM) systems in high-speed train (HST) environment, the inter-carrier interference (ICI) is caused by the non-stationary time-varying channel. In this paper, the adaptive cancellation for ICI is explored on the basis of phase rotated conjugate cancellation (PRCC) scheme. An ICI adaptive cancellation algorithm is proposed by updating the optimal phases per two OFDM symbol periods. The simulation results demonstrate that the proposed algorithm is applicable to mitigate the ICI in HST environment. It can enormously increase the carrier-to-interference ratio (CIR), which is better than the traditional ICI self-cancellation algorithm. The bit error rate (BER) decreases at the rate of 95.4%, 90.0% and 66.7%, comparing to those in standard MIMO-OFDM systems when the train runs at the speed of 300[km/h], 400[km/h] and 500[km/h], respectively. |
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| Keywords:Communication and information systems, Non-stationary time-varying channel, MIMO-OFDM systems, Inter-carrier interference, Adaptive phase rotated conjugate cancellation, Carrier-to-interference ratio |
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