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In this paper, a new pilot structure for LTE downlink system in SISO and MIMO cases is introduced in order to improve the channel estimation performances. The downlink reference signal structure in LTE is important for channel estimation. Pre-defined resource elements in the time and frequency domain are carrying the cell-specific reference signal sequence. However, those standard pilot scattering contains more empty resource element as the number of transmit or receiver antennas increases, leading to a decrease of the system performances.
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