Abstract:
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Current state-of-the-art approaches are evaluated for the downlink (DL) of an LTE-based wireless network when multiple Small-Cells (SC) eNBs coexist in the same area. With
the aim of increasing data-rate performance of users, we consider that all SCeNBs reuse the same resources. In this situation, inter-cell interference (ICI) becomes the main impairment in the communication. One of the solution may be the use of time domain eICIC (TDM muting), allowing to avoid the ICI. An alternative strategy is to employ multiple-input multiple-output (MIMO) techniques if channel state information (CSI) at the transmitter (CSIT) can be exploited. Nevertheless, CSI reported by User Equipments (UEs) may suffer large delays, even higher than the channel coherence time, and non-perfect accuracy, where
the errors are due to the adopted feedback schemes: digital or analog. In this context, the approach in [1] for the interference channel (IC), and assuming imperfect delayed CSIT is considered, getting insight into the benefits of the MIMO-based over the eICIC-based schemes. |