Characteristics of the Hexapolarized MIMO Channel over Free-Space and Three Non-Free-Space Scenarios

IEEE Trans. Antennas Propagat.

Guo

et al. 2015

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In this paper, a co-located tri-polarized loop (TPL) antenna is proposed and a co-located tri-polarized dipole (TPD) antenna is also designed for multiple-input multiple-output (MIMO) performance comparison. Both antennas have satisfactory performances of impedance bandwidth and isolation. The channel measurements are conducted in a non-lossy reverberation chamber (RC), a lossy RC, a corridor and an office room. For both antennas, the measured average correlation coefficients (CCs) in the non-lossy RC are the smallest, close to 0.1, in the lossy RC are the largest, 0.3-0.5, and in the two indoor scenarios are slightly larger than that in the non-lossy RC. Except for the signal correlation, the relative path loss (RPL) should also be included to fairly compare the channel capacities. If the RPL is considered, a strong dependence of the channel capacity on the propagation properties can be seen. For both antennas, the channel capacities in the two indoor scenarios are 20%-30% smaller than that in the non-lossy RC. Interestingly, both antennas have similar condition numbers (CNs) in all the four scenarios, whose PDFs are close to that of the independent identically distributed (i.i.d) complex Gaussian channel, which reveals that both antennas can obtain nearly three independent parallel subchannels and good multiplexing performance.Index Terms-Tri-polarized loop (TPL), tri-polarized dipole (TPD), multiple-input multiple-output (MIMO), measurement. 0018-926X (c)

Section: Comparison With the Results From Image Theorymentioning

confidence: 99%

“…However, the co-located and orthogonal HP vector antenna is hard to realize, due to the constrains of feeding and mutual coupling. Most of the performance evaluations of the HP MIMO system are based on theoretical analysis or numerical simulations [1]- [5].…”

Section: Introductionmentioning

confidence: 99%

Measurement-Based Performance Comparison of Colocated Tripolarized Loop and Dipole Antennas

IEEE Trans. Antennas Propagat.

Guo

et al. 2015

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“…Recently, multiple-input multiple-output (MIMO) systems composed of colocated orthogonal multipolarized antennas have drawn a lot of research interests [1]- [3], thanks to its potential in the dense antenna array MIMO applications. The measurement results by a tri-polarized dipole antenna in the rich multipath indoor environment verify a threefold capacity increase over the one polarized antenna system [4]- [6].…”

Section: Introductionmentioning

confidence: 99%

Measured MIMO channel capacity of a virtual colocated tri-polarized loop antenna

2015 IEEE International Symposium on Antennas and Propagation &Amp; USNC/URSI National Radio Science Meeting

Zhang

et al. 2015

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The channel matrix of a MIMO (multiple-input multiple-output) system composed of a virtual colocated tripolarized loop (TPL) antenna is measured in an anechoic chamber and an office room. Results show that in both scenarios, the TPL antenna can obtain a nearly 3 fold capacity increase over the one-polarized loop (OPL) antenna, and can obtain a nearly 1.5 fold capacity increase over the dual-polarized loop (DPL) antenna. Furthermore, in both scenarios, using the TPL antenna can obtain 3 nonzero eigenvalues, which indicates that three effective parallel channels can be generated. Numerical computations are also conducted by commercial software Ansoft HFSS, the simulated capacity results agree basically with the measured results.

“…Multipolarized antenna can be used to detect vector electromagnetic field components, which is very attractive to wireless communication, localization, and navigation. The potential of utilizing all the three electric dipoles and three magnetic dipoles for communication which are colocated and orthogonal has been theoretically evaluated in [1][2][3][4][5]. To obtain high polarization degrees of freedom with the colocated multipolarized antennas, high port isolations between the antennas are generally required.…”

Section: Introductionmentioning

confidence: 99%

Study of the Colocated Dual-Polarized MIMO Capacity Composed of Dipole and Loop Antennas

Jia

International Journal of Antennas and Propagation

et al. 2015

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The colocated dual-polarized dipole (DPD) and dual-polarized loop (DPL) MIMO channel performances are compared. Computation results show that, for the ideal electric and magnetic dipoles, the dual-polarized MIMO systems have identical channel capacity. But the contour plots of the capacity gain of the realistic DPD and DPL are different, due to the difference in antenna patterns. The cumulative distribution function (CDF) of the capacity gain in the two-mirror (TM) channel shows that, for small distance, the capacity gain obtained by the DPD is obviously smaller than that of the DPL, but, with the increase of the distance, the difference gets smaller. A DPL with low mutual coupling is fabricated. Measured results show that high MIMO capacities can be obtained by this DPL in both the anechoic chamber (AC) and the realistic office room. The capacity gain of the DPL antenna is 1.5–1.99, which basically coincides with the theoretical and numerical results. Furthermore, the capacity of the virtual DPL antenna with no mutual couplings is also investigated. It is shown that, in the AC, the mutual coupling will generally decrease the dual-polarized MIMO capacity; however, in the office room, the effect of mutual coupling is not always negative.