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Acoustic communications in underwater environment are considerably influenced by the physical characteristics of the medium. This is even more true in the polar regions where the presence of icebergs and icy water layers represent an additional dependence to the signal propagation. Considering a MIMO scenario, we investigate how the channels spatial correlation is conditioned in the case of both frozen...
Evaporation duct has strong impacts on the performance of marine radar and communication systems. Evaporation duct channel is a promising channel for marine high capacity data transmission. Wave propagation models and evaporation duct models are well studied, and statistical features of duct channel has been observed. However, the work on the physical model of small-scale characteristics of evaporation...
Multi Input Multi Output Constant Envelope Modulation (MIMO-CEM) system is introduced as an alternative candidate for the commonly used MIMO Orthogonal Frequency Division Multiplexing (MIMO-OFDM) system due to its efficient power and complexity capabilities. MIMO-CEM has a transmitter system with an efficient non-linear power amplifier and a receiver system with a 1-bit Analog to Digital Converter...
In this work, we study the performance of a single relay Multiple Input Multiple Output (MIMO) cooperative communication system based on Decode and Forward (DF) relaying protocol for two strategies using transmit antenna selection at the source. The first strategy uses one antenna between the relay and the destination, and the second strategy uses Space Time Block Coding (STBC). All channels follow...
Updated nonlinearity models for solid-state power amplifiers (SSPAs) include both amplitude and phase distortions, and thus being the same as nonlinearities in traveling-wave tube amplifiers (TWTAs), resulting in detrimental effects for multiple-input multiple-output space-time block code (MIMO-STBC) systems with nonlinear amplifications. This work presents a thorough investigation for the performance...
In this paper, self-interference (SI) cancellation algorithm based on Space Projection Algorithm (SPA) is proposed for Full-Duplex (FD) Multiple-Input Multiple-Output (MIMO) relays in an indoor wireless communication system. The simultaneous transmission and reception of the same radio signal imply a SI around the relay transceiver. The principal challenge of implementing the FD-MIMO relay is to this...
A possible scenario for the evolution of Television Broadcast is the adoption of 8 K resolution video broadcasting. To achieve the required bit-rates MIMO technologies are an actual candidate. In this scenario, this paper collected electric field levels from a MIMO experimental system for TV broadcasting to tune the parameters of the ITU-R P.1546 propagation model, which has been employed to model...
This paper propose a method of suppressing inter-user interference in the in-band full duplex communication. In this method, an interference compress technique is used for eliminating the interference at the receiving terminal. Also, we evaluated the achievable transmission rate of the proposed method by using channel state information (CSI) measured by the outdoor field experiment.
In this paper, we investigate feasibility of orbital angular momentum (OAM) based analog transmission method. The method uses analog discrete Fourier transform (DFT) feed networks for mode generation as well as circular array antenna with right-hand and left-hand circular polarizations. The simulation revealed the designed array antennas enhance the capacity up to double of the single polarization...
Multivariable processes are frequently found in continuously operated plants as in chemical, pulp or metallurgical industry. These processes are frequently operated in closed-loop to achieve a secure operation and/or to meet production objectives. Hence, for reasons of plant safety and in order not to violate product quality performing experiments for system identification can be forbidden in the...
In large power electronic systems like a wind farm, the mutual interactions between the control systems of the power converters can lead to various stability and power quality problems. In order to predict the system dynamic behavior, this paper presents an approach to model a wind farm as a Multi-Input Multi-Output (MIMO) dynamic system, where the current control loops with Phase-Locked Loops (PLLs)...
This paper presents a 28–32 GHz transceiver chip architecture in SiGe BiCMOS to meet the requirements of 5G phased-array communication links. An asymmetric design is employed for the transmit and receive paths to deliver an output P1dB of 8 dBm in TX mode and to achieve an input P1dB of 0 dBm in RX mode. The chip can operate with an external LO at 10–16 GHz and 20–28 GHz with the use of an on-chip...
Massive multiuser multi-input multi-output (MU-MIMO) system adopting large amount of antennas is a promising technique to improve spectral efficiency and energy efficiency for next generation wireless communication systems. In practice, the channels composed of pairs of transmit and receive antennas are often correlated and computational complexity is one of the critical concern in implementation...
To improve the spectrum efficiency in wireless communication systems, multiple-input multiple-output (MIMO) technology uses multiple antennas and allows several users to share the same spectrum and antennas by using precoding technique. In the leakage-based precoding technique, generalized eigenvalue decomposition (GEVD) must generate many precoding matrices for all users in the base station to avoid...
We present a novel angle based indoor localization approach which exploits the directivity property of the smart antenna array at both transmitter and receiver sides. In contrast to conventional AOA based localization approaches, our system combines using beam steering transmitting and receiving approach to mitigate the effect of indoor multipath propagation. By setting the receiver beamforming weights,...
High fluctuation of signal strength is evident in wireless channel under mobile environment. IEEE 802.11n and IEEE 802.11ac based wireless technologies experience a challenge for selecting link configuration parameters, like number of spatial streams, channel bonding, advanced modulation and coding schemes, frame aggregation etc., dynamically under mobility. Selection of the best possible data rate...
The authors have been researching a 4×4 SVD-MIMO-OFDM system that adaptively changes transmitter weights and modulation schemes in accordance with feedback information received by a TDD. This report presents our evaluation of the effects of feedback delays due to the TDD on the BER performance of the proposed system. The computer simulation results revealed that the required normalized SNR of a system...
A non-isothermal Continuous Stirred Tank Reactor (CSTR) is the most important element of chemical industrial equipment which exhibits a highly nonlinear behavior. It is one of multi-input multi-output (MIMO) nonlinear systems affected by disturbances. The operation of the non-isothermal CSTR is disturbed by external factors such as changes in the inlet concentration and temperature. Therefore, the...
ITU-R M.1842-1, which is one of the renowned specification for VHF data exchange system (VDES) devoted to maritime mobile applications, has been standardized wireless transmission protocols according to the peculiar characteristics of a maritime communications scenario. Generally, in the Annex-4 of ITU-R M.1842-1, the VHF data link protocols for maritime mobile services are described along with a...
This paper considers a frequency-division-duplexing (FDD) massive multiple-input multiple-output (MIMO) system that operates with two-stage beamforming based on user grouping. In this system, we propose a first stage beamformer and a user grouping method for the two-stage beamforming. The proposed first stage beamformer maximizes an approximate sum rate calculated from the second-order statistic of...
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