Capacity Enhancement Using MIMO Antenna Arrays in Realistic Macro-Cellular Urban Environment |
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Authors: | Pedro Vieira Paula Queluz António Rodrigues |
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Affiliation: | (1) Polytechnic University of Bucharest, Bucharest, Romania;(2) University of Agder, Grimstad, Norway |
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Abstract: | In MIMO systems the antenna array configuration in the BS and MS has a large influence on the available channel capacity.
In this paper, we first introduce a new Frequency Selective (FS) MIMO framework for macro-cells in a realistic urban environment.
The MIMO channel is built over a previously developed directional channel model, which considers the terrain and clutter information
in the cluster, line-of-sight and link loss calculations. Next, MIMO configuration characteristics are investigated in order
to maximize capacity, mainly the number of antennas, inter-antenna spacing and SNR impact. Channel and capacity simulation
results are presented for the city of Lisbon, Portugal, using different antenna configurations. Two power allocations schemes
are considered, uniform distribution and FS spatial water-filling. The results suggest optimized MIMO configurations, considering
the antenna array size limitations, specially at the MS side. |
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