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In this paper, the authors propose to improve the performance of the channel estimation for LTE Downlink systems under the effect of the channel length. As LTE Downlink system is a MIMO-OFDMA based system, a Cyclic Prefix (CP) is inserted at the beginning of each transmitted OFDM symbol in order to mitigate both Inter-Carrier Interference (ICI) and Inter-Symbol Interference (ISI). The inserted CP is usually equal to or longer than the channel length. However, the cyclic prefix can be shorter because of some unforeseen channel behaviour.
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