5,309 research outputs found
On the Area Energy Efficiency of Multiple Transmit Antenna Small Base Stations
We analyze the area energy efficiency (AEE) of
spatial multiplexing (SM) and transmit antenna selection (TAS),
considering a realistic power consumption model for small base
stations (BSs), which includes the power consumed by the
backhaul as well as different interference attenuation levels. Our
results show an optimum number of BSs for each technique that
maximizes the AEE. Moreover, we also show that TAS has a
larger AEE than SM when the demand for system capacity is
low, while SM becomes more energy efficient when the demanded
capacity is larger. Additionally, when the capacity demand and
the area to be covered are fixed, the number of BSs needed to
be deployed is smaller for SM than for the other techniques.
Finally, the system performance in terms of AEE is shown to be
strongly dependent on the amount of interference, which in turn
depends on the employed interference-mitigation scheme, and on
the employed power consumption model
Wearable Communications in 5G: Challenges and Enabling Technologies
As wearable devices become more ingrained in our daily lives, traditional
communication networks primarily designed for human being-oriented applications
are facing tremendous challenges. The upcoming 5G wireless system aims to
support unprecedented high capacity, low latency, and massive connectivity. In
this article, we evaluate key challenges in wearable communications. A
cloud/edge communication architecture that integrates the cloud radio access
network, software defined network, device to device communications, and
cloud/edge technologies is presented. Computation offloading enabled by this
multi-layer communications architecture can offload computation-excessive and
latency-stringent applications to nearby devices through device to device
communications or to nearby edge nodes through cellular or other wireless
technologies. Critical issues faced by wearable communications such as short
battery life, limited computing capability, and stringent latency can be
greatly alleviated by this cloud/edge architecture. Together with the presented
architecture, current transmission and networking technologies, including
non-orthogonal multiple access, mobile edge computing, and energy harvesting,
can greatly enhance the performance of wearable communication in terms of
spectral efficiency, energy efficiency, latency, and connectivity.Comment: This work has been accepted by IEEE Vehicular Technology Magazin
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