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In this paper, we study the achievable multiplexing gain of millimeter wave (MMW) line-of-sight (LoS) multiple-input multiple-output (MIMO) channels with non-uniform linear antenna arrays (NULAs) at both the transmitter and receiver. We first present an analytical characterization for the asymptotic channel eigenvalues with arbitrarily deployed NULAs. Then, aiming at achieving an effective multiplexing...
Massive multiple input and multiple output (MIMO) systems can increase the spectrum and energy efficiency of existing cells, and because of this, massive MIMO has been considered as a potential technique for next generation wireless communication networks. Since a thorough knowledge of the propagation channel is a prerequisite of reliable communication systems, massive MIMO channels are of great current...
Multiple-input multiple output (MIMO) has been adopted by long term evolution (LTE) and its updated version LTE-Advanced (LTE-A) to increase system spectrum efficiency. However, the benefits of multi-user (MU) MIMO highly rely on an accurate channel knowledge at the transmitter. So proper codebook design is a key problem for LTE-A FDD downlink system. In this paper, the channel characteristic specific...
In this paper a spatially and temporally clustered channel model is proposed to be applicable to Wireless Local Area Network (WLAN) MIMO systems based on circular antenna arrays (UCA). Properties of multipath taps along with angular and power values of clusters are included in this model to consider wideband signal with frequency selective fading channels. Link performance of systems that utilize...
A new wideband compact slot antenna array with cavity back for indoor wireless local area network (WLAN) access points (AP) is described, covering several wireless communication services from 2.4 to 4.8 GHz, that is especially designed to enhance multiple-input-multiple-output (MIMO) system performance. Despite very close packing of the array elements, these exhibit very low mutual coupling (<;-60;-23...
The bandwidth efficiency of Multiple Input - Multiple Output (MIMO) channels with different antenna arrays is analyzed. MIMO channels with a strong and unobstructed line-of-sight (LOS) signal component are considered, as it is the case in indoor in-room scenarios. The bandwidth efficiency of such channels is strongly dependent upon the applied antenna array and its orientation. Simulations of the...
The beampattern of MIMO (Multiple-input Multiple-output) radar is the product of transmitter and receiver beam pattern. Exploiting uniform linear array, the beampattern has no grating lode when a certain relation between the space of transmitter element and receiver element is met. Moreover, this kind of collocation takes on maximum virtual array aperture. Exploiting non-uniform linear array, the...
This paper presents a novel technique to enhance the link performance in satellite network. The technique exploits the location diversity of terminals in the ground segment (stations) and the Multiple Input Multiple Output (MIMO) mathematical frames (also known as `Network MIMO'). In this technique these diverse terminals are linked to a control unit (e.g. the hub) to coordinate the joint transmission\...
This paper reports the performance of Block Diagonalization (BD) scheme for different array antenna structures used in a multiuser Multiple Input Multiple Output (MIMO) system. The assessment is performed in terms of sum rate capacity. Theoretical analysis as well as computer simulations shows that the spatial correlation downgrades downlink performance of BD. The simulations also reveal that the...
In this paper, a compact dual-band microstrip patch array antenna for both the MIMO 4G LTE and the WLAN systems is developed. Design simulation and optimization processes are carried out with the aid of the Advanced Design System (ADS) electromagnetic simulator that uses the full-wave Method of Moment (MoM) numerical technique. The losses that are caused by both the substrate and metallization are...
The paper reports on the performances of training-based channel estimation methods in a multiple input multiple output (MIMO) communication system with transmitter equipped with a uniform linear array (ULA) and receiver equipped with either uniform circular array (UCA) or uniform linear array (ULA). In the undertaken investigations, the receiver is assumed to be free from any obstacles while the transmitter...
In this paper, we focus on communication from airplanes to air traffic control (ATC) towers at airports, employing multiple antennas at the ATC. The whole air-to-ground communication system can then be modeled as a MIMO MAC channel with mobile users. The main aim is to demonstrate that multiuser MIMO systems can be useful for achieving spectrally efficient aeronautical communications, to quantify...
In the paper, performance of multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) eigenbeam-space division multiplexing (E-SDM) systems using uniform circular antenna arrays is evaluated. We conducted a MIMO channel measurement campaign at a 5.2 GHz frequency band in an indoor fading environment. Simulation results based on the measured data have shown that differently...
This paper investigates the impact of multiple antenna design on UWB spatial multiplexing performance. Different antenna designs have been tested in linear array configuration. The performance evaluation is based on a UWB MIMO channel measurement campaign in the 2-10 GHz band in indoor scenarios.
For a cellular system with a fixed number of transmit antennas at each base station, we investigate how the system-level performance varies as a function of the geometry of the transmit array used at each base station. Our results show that the system-level performance of a cellular system can be significantly improved by using transmit antenna geometries other than the uniform linear arrays that...
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