Massive multiple-input multiple-output (MIMO) is
one of the promising technologies to be used in the future fifth
generation (5G) wireless networks for its capability to increase
the system throughput, improve spectral efficiency and energy
efficiency. To achieve these benefits of the massive MIMO, there
are many challenges that need to be handled. One of these
challenges is the pilot contamination problem that arises from
reusing pilot sequences among the system cells. Since this problem
is considered as a bottleneck of the system performance, it
attracted many researchers who proposed schemes to solve it.
In this paper, we propose a new scheme that mitigates its effect
by adopting both asynchronous pilot transmission (APT) and
fractional pilot reuse (FPR). We compare the performance of our
proposed scheme with other schemes using computer simulations
and show that our proposed scheme enhances the performance of
the time division duplex (TDD) multi-cell massive MIMO systems
in terms of the signal to interference and noise ratio (SINR) and
capacity. |
