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

Abstract

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)

Experimental Evaluation of the Tri-Polarized MIMO Channel Properties Based on a Compact Multimode Antenna

“…Thus, it provides us a very suitable laboratory-produced environment to measure the performance of a MIMO system. The RC used in the measurement has a volume of 1.1 × 0.7 × 0.6 m 3 with two metal stirrers [8], which is depicted in Fig. 2.…”

“…As can be seen from (8), the value of ES is 0 if one of the eigenvalues is zero, which means the multipath is not sufficiently rich to support M parallel modes of communication and the channel is rank deficient. If all eigenvalues are equal, ES = 1.…”

“…demonstrated, using tri-polarized antenna containing one loop and two dipoles at 2.25 GHz [4], 3 dipoles at 3.85 GHz [6], 3 dipoles and 3 slots at 2.55 GHz [7], and a dual-polarized patch and a monopole at 2.2 GHz [11]. The MIMO performances were also compared between a tripolarized loop and a tri-polarized dipole at 2.45 GHz [8] in the reverberation chamber (RC) and some indoor environments.…”

Measured Performance Comparisons between Spatial Multiplexing and Beamforming Arrays in the 28 GHz Band

“…It is well known that, besides SNR, the MIMO capacity also depends heavily on correlation properties of the channel matrix, which is decided by the complex interaction between antenna radiation characteristic and the surrounding environment. A MIMO system can only perform well if the channel elements are statistically independent [20]. In Figure 9, the Rx correlation coefficients (CCs) with respect to Tx port 1 of the SM array are described, and the results corresponding to other Tx ports are similar.…”

Manifold ambiguity and performance analysis for electric‐measurement‐only polarisation sensitive arrays

“…(ii) Spatially‐spread PSA (SS‐PSA) : As the name suggests, any two dipoles/loops in such arrays are spatially non‐collocated [8, 9]. As expected, SS‐PSAs are free from the high cost and difficulty for designing multi‐port antennas with high isolation and low mutual coupling [10]. Therefore, more practical applications can be found in existing radar and communication systems [11].…”