'Institute of Electrical and Electronics Engineers (IEEE)'
Doi
Abstract
Distributed antenna systems (DAS) have been shown
to considerably outperform conventional cellular systems in terms
of capacity improvement and interference resilience. However,
the influence of frequency reuse planning on the performance
of DAS remains relatively unknown. To partially fill this gap,
this paper presents a comparative analysis of the down-link
of DAS versus conventional cellular systems using different
values of frequency reuse factor. The analysis assumes Rayleigh
fading channels and it also considers maximum-ratio-combining
(MRC) receivers at the user terminals to exploit diversity both
in the transmission and reception links. Numerical evaluation
of the analytical expressions shows that, in general, for most
of the cases DAS can achieve better performance figures than
conventional cellular systems using considerably smaller values of
frequency reuse factor. Conversely, DAS can significantly improve
the throughput (2x-3x) and power consumption (6-10 dB) of
conventional systems when using the same frequency reuse factor.
An interesting result shows that in some particular cases DAS
outperform conventional cellular systems no matter the frequency
reuse factor used by the latter one, which indicates an effective
capacity gain provided by the combined operation of DAS and
MRC receivers
