Since the future mobile networks will require significantly higher data
throughput, and the Long-Term Evolution (LTE) licensed bands are already
occupied, the frequency band extension and the data rate increase may be
achieved by using some of the available unlicensed bands. The most
appropriate unlicensed band for this purpose lies in 5 GHz frequency range.
However, this unlicensed band is already occupied by WiFi networks and a
special attention has to be paid to coordinate these two different networks
in the shared spectrum usage. Therefore, this paper considers the shared
access co-existence in 5 GHz unlicensed band between uncoordinated LTE and
WiFi networks. More precisely, it considers the influence of the LTE downlink
transmission on the performance of the WiFi networks. The experimental
results show that the LTE significantly degrades the WiFi network
performance, which means that some of the coordination algorithms have to be
employed.
In this paper an approach to efficient computation of radiation pattern in FDTD simulation environment is presented. A necessary large distance from the radiating object is achieved by multigrid space discretization with unilaterally connected subdomains. A numerical dispersion is reduced using more general complex-envelope finite difference time domain (CE-FDTD) formulation and high order accuracy FDTD schemes where possible. In order to examine how much the introduced algorithm complexity and increased demands concerning computational power and memory are justified by the gain in accuracy, several different scenarios were considered.
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