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The behavior of radio propagation in cross-polarization (X-pol) in urban environment is studied with the aid of both MIMO measurements and ray tracing simulation. Several microcellular scenarios are considered in the paper (LOS, NLOS, street corner), and the behavior of X-pol discrimination (XPD) as a function of the distance is analyzed. Results show that typical XPD values fall between 8 and 10...
Polarization diversity gain of the X-type polarization diversity system is determined by two factors: spatial correlation and average power ratio. These two factors are affected by mutual coupling (MC) greatly. Base on the polarization diversity antenna construction, a precise expression of MC, that is, mutual impedance is derived in this document. Combined with the equivalent MC network, the effects...
It is well known that spatially separated antennas can provide uncorrelated signals in a rich scattering environment. Under suitable conditions, orthogonally polarized antennas can provide uncorrelated signals without requiring any or much spatial separation. The channel capacity gains that result from MIMO (in general) depend heavily on the scattering environment. In this paper, we are interested...
The comparison of the outage capacity for multiple-input multiple-output (MIMO) channel models that are based on different channel models is made. For this comparison, we chose the 3GPP Spatial Channel Model (SCM), a METRA Analytical Spatial Channel Model (A-SCM), and the correlation-based Long Term Evolution channel model (LTE). The effects of antenna element separation, array orientation, angle...
The need for accurately characterizing the spatial domain of the wireless channel has become increasingly important with the growing use of wireless technology. To facilitate the development of signaling strategies and Multiple-Input Multiple-Output (MIMO) system architectures, many different channel modeling strategies have been employed. When it is desirable to create many different channel matrix...
Mutual coupling is an important factor for the study of multiple-input multiple-output antenna system. A study of the effect of mutual coupling between the antenna elements of MIMO system has been performed. We focus on the userpsilas spectral efficiency and data throughput where coupling environment is present. A key contribution of this paper is a simple MIMO structure that offers higher spectral...
A hybrid method of modeling MIMO systems is presented through the combined use of full-wave electromagnetic (EM) simulations and statistical channel models. This approach consists of simulating each antenna in the antenna array to compute its embedded element pattern including all of the near-field electromagnetic and coupling effects. These embedded patterns are then uploaded into the measurement-based...
In MIMO system, the effect of mutual coupling between the antennas influences and often deteriorates the transmission capacity of the wireless communications. In this paper, band-stop filters using spur-line and CPS structures between two antennas are proposed to reduced the effect of the coupling. Simulation and measurement show that more than 20dB isolation between antennas has been obtain in a...
A theoretical model was developed to estimate effect of the mutual coupling on the energy requirement of a multiple-input multiple-output (MIMO) based wireless sensor network (WSN). Clustered channel modeling with Rician fading distribution is assumed to include the effect of the line-of-sight (LOS) ray paths. The effect of propagation environments is included in the analysis by assuming a two-slope...
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