Time Domain Signal Detection for MIMO OFDM

The MIMO techniques with OFDM is regarded as a promising solution for increasing data rates, for wireless access qualities of future wireless local area networks, fourth generation wireless communication systems, and for high capacity, as well as better performance. Hence as part of continued research, in this paper an attempt is made to carry out modelling, analysis, channel matrix estimation, synchronization and simulation of MIMO-OFDM system. A time domain signal detection algorithm can be based on Second Order Statistics (SOS) proposed for MIMO-OFDM system over frequency selective fading channels. In this algorithm, an equalizer is first inserted to reduce the MIMO channels to ones with channel length shorter than or equal to the Cyclic Prefix (CP) length. A system model in which the ith received OFDM block left shifted by j samples introduced. MIMO OFDM system model which uses the equalizer can be designed using SOS of the received signal vector to cancel the most of the Inter Symbol Interference (ISI). The transmitted signals are then detected from the equalizer output. In the proposed algorithm, only 2P (P transmitted antennas / users in the MIMO-OFDM system) columns of the channel matrix need to be estimated and channel length estimation is unnecessary, which is an advantage over an existing algorithms. In addition, the proposed algorithm is applicable for irrespective of whether the channel length is shorter than, equal to or longer than the CP length. Simulation results verify the effectiveness of the proposed algorithm and shows that it out performs the existing one in all cases

THE INFLUENCE OF MOMENTUM AND CONCENTRATION SLIP BOUNDARY CONDITIONS ON A FERROMAGNETIC DIPOLE WITH RADIATION, THERMOPHORESIS, AND BROWNIAN MOTION

A magnetic dipole effects nonlinear thermal radiation from ferromagnetic liquid when stretched provinces are analyzed numerically utilizing various parameters pertinent to the problem. Ferrofluid will undergo a phase shift and become magnetic when it is in a magnetic field. This technique is useful in various fields, including electronics, loudspeakers, and materials research. This research aimed to gain further knowledge about the one-of-a-kind continual flow of ferrofluids via permeable medium, including Brownian and thermophoresis influences. Ordinary differential equations may be generated using the appropriate similarity transformation. After that, the equations are solved by using the approach known as bvp4c. Calculations are carried out to obtain the results of physical parameters with non-dimension quantities. The effects of velocity, temperature, and concentration, as well as the applications of these factors, are shown graphically. The velocity is affected in various ways by two factors, namely, the ferromagnetic parameter and the distance. The concentration is increased due to both the thermophoretic and Brownian variables. The frictional force rises as the ferromagnetic and Brownian motion parameters increase, yet the Sherwood and Nusselt numbers decrease throughout this process

Time Domain Signal Detection for MIMO OFDM

The MIMO techniques with OFDM is regarded as a promising solution for increasing data rates, for wireless access qualities of future wireless local area networks, fourth generation wireless communication systems, and for high capacity, as well as better performance. Hence as part of continued research, in this paper an attempt is made to carry out modelling, analysis, channel matrix estimation, synchronization and simulation of MIMO-OFDM system. A time domain signal detection algorithm can be based on Second Order Statistics (SOS) proposed for MIMO-OFDM system over frequency selective fading channels. In this algorithm, an equalizer is first inserted to reduce the MIMO channels to ones with channel length shorter than or equal to the Cyclic Prefix (CP) length. A system model in which the ith received OFDM block left shifted by j samples introduced. MIMO OFDM system model which uses the equalizer can be designed using SOS of the received signal vector to cancel the most of the Inter Symbol Interference (ISI). The transmitted signals are then detected from the equalizer output. In the proposed algorithm, only 2P (P transmitted antennas / users in the MIMO-OFDM system) columns of the channel matrix need to be estimated and channel length estimation is unnecessary, which is an advantage over an existing algorithms. In addition, the proposed algorithm is applicable for irrespective of whether the channel length is shorter than, equal to or longer than the CP length. Simulation results verify the effectiveness of the proposed algorithm and shows that it out performs the existing one in all cases.</jats:p

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Not AvailableThe protective efficacy of a DNA construct containing extra small virus antisense (XSVAS) gene of nodavirus encapsulated with chitosan nanoparticles (NPs) was investigated in giant freshwater prawn Macrobrachium rosenbergii (De Man, 1879). The delivery was carried out using oral and immersion methods. A plasmid concentration of 100 ng μL(-1) when conjugated with chitosan NPs was found to be more effective in increasing the survivability of the infected prawn. The particle mean size, zeta potential and loading efficiency percentage were 297 nm, 27 mV and 85%, respectively. The ability of the chitosan to form a complex with the plasmid was studied by agarose gel electrophoresis. The NPs were characterized by atomic force microscopy (AFM). Persistence study showed the presence of the DNA construct up to 30th day post-treatment. The oral treatment was found to be better than the immersion treatment for delivery of the chitosan-conjugated DNA construct. This is probably the first report on the delivery of nanoconjugated DNA construct in M. rosenbergii, against nodavirus.Not Availabl

Intelligent OFDM Telecommunication Systems Based on Many-Parameter Complex or Quaternion Fourier Transforms

In this paper, we propose novel Intelligent quaternion OFDM-telecommunication systems based on many-parameter complex and quaternion transform (MPFT). The new systems use inverse MPFT (IMPFT) for modulation at the transmitter and direct MPFT (DMPFT) for demodulation at the receiver. The purpose of employing the MPFT is to improve: (1) the PHY-LS of wireless transmissions against to the wide-band anti-jamming and anti-eavesdropping communication; (2) the bit error rate (BER) performance with respect to the conventional OFDM-TCS; (3) the peak to average power ratio (PAPR). Each MPFT depends on finite set of independent parameters (angles). When parameters are changed, many-parametric transform is also changed taking form of different quaternion orthogonal transforms. For this reason, the concrete values of parameters are specific “key” for entry into OFDM-TCS. Vector of parameters belong to multi-dimension torus space. Scanning of this space for find out the “key” (the concrete values of parameters) is hard problem. © 2020, The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Switzerland AG.Russian Foundation for Basic Researc

Many-Parameter Quaternion Fourier Transforms for Intelligent OFDM Telecommunication System

In this paper, we aim to investigate the superiority and practicability of many-parameter quaternion Fourier transforms (MPQFT) from the physical layer security (PHY-LS) perspective. We propose novel Intelligent OFDM-telecommunication system (Intelligent-OFDM-TCS), based on MPFT. New system uses inverse MPQFT for modulation at the transmitter and direct MPQFT for demodulation at the receiver. The purpose of employing the MPFTs is to improve the PHY-LS of wireless transmissions against to the wide-band anti-jamming communication. Each MPQFT depends on finite set of independent parameters (angles), which could be changed independently one from another. When parameters are changed, multi-parametric transform is also changed taking form of a set known (and unknown) orthogonal (or unitary) transforms. We implement the following performances as bit error rate (BER), symbol error rate (SER), the Shannon-Wyner secrecy capacity (SWSC) for novel Intelligent-MPWT-OFDM-TCS. Simulation results show that the proposed Intelligent OFDM-TCS have better performances than the conventional OFDM system based on DFT against eavesdropping. © 2020, The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Switzerland AG.Russian Foundation for Basic Researc