Title :
Capacity Evaluation of MIMO Antenna Systems Using Spherical Harmonics Expansion
Author :
Ximenes, Leandro R. ; De Almeida, André L F
Author_Institution :
Wireless Telecom Res. Group - GTEL, Fed. Univ. of Ceara - UFC, Fortaleza, Brazil
Abstract :
Multiple input multiple output (MIMO) wireless communication systems have been intensely investigated in the past years. In order to understand the fundamental limitations of antennas and propagation models on the performance of MIMO systems, the use of spherical harmonics theory allows to decouple the effects of the antennas and the propagation medium. In this work, we make use of spherical harmonics expansion to perform a spherical mode analysis of MIMO systems including the effect of different transmit/receive antennas. Two antenna models are used for evaluating the capacity behavior as a function of their associated spherical harmonics expansion. The first antenna is a theoretical dipole antenna, whose spherical harmonics coefficients have uniform distribution. The second is a a real-world patch antenna, whose coefficients were obtained from practical RF measurements. Both antennas are simulated in a rich-scattering propagation scenario (i.i.d. channel). Our results illustrate how channel capacity is dependent on the number and distribution of the antennas´ spherical modes.
Keywords :
MIMO communication; antenna arrays; broadband networks; DOA distribution; Kista; MIMO antenna array configurations; MIMO channel characterization; MIMO wireless channel characterization; Stockholm; Sweden; capacity evaluation; outdoor environment; polarization diversity; wideband channel measurement campaigns; Antenna arrays; Antenna radiation patterns; Antenna theory; Harmonic analysis; MIMO; Receiving antennas;
Conference_Titel :
Vehicular Technology Conference Fall (VTC 2010-Fall), 2010 IEEE 72nd
Conference_Location :
Ottawa, ON
Print_ISBN :
978-1-4244-3573-9
Electronic_ISBN :
1090-3038
DOI :
10.1109/VETECF.2010.5594365