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The large-scale multiple-input multiple-output system with full-duplex relay is a promising candidate for future mobile communication systems, where accurate channel estimation is very challenging due to interference. In this paper, we address two channel estimation problems for such systems: individual estimation, where both the base station (BS) and the relay estimate their respective channels,...
Femtocells are envisioned as a key solution to embrace the ever-increasing high data rate and thus are extensively deployed. Given that numerous femtocell access points (FAPs) deployed in ultra- dense networks (UDNs) lead to significant energy consumption, boosting their energy efficiency (EE) becomes an important issue to be addressed. However, most existing works either focus on homogeneous networks...
The proliferation of data-hungry smart electronic devices, such as smartphones and intelligent vehicles, has driven the capacities of current mobile communication systems towards their limits. To tackle this formidable challenge, 3GPP Long Term Evolution has recognized network densification with low-power small cells (SCs) as a key paradigm in the upcoming 5G communication system. In this article,...
This paper introduces a novel backhaul architecture for LTE small cells, where the macro eNB transports backhaul traffic wirelessly to a small cell through a new type of backhauling component, referred to as Type-A Relay. Equipped solely with UE modules, a Type-A relay is capable of communicating simultaneously with two eNBs by leveraging the downlink resource of one as well as the uplink resource...
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