Dinesh Sharma

MIMO to LS-MIMO: A road to realization of 5G

MIMO means multiple inputs multiple outputs. As it refers MIMO is a RF technology used in many new technologies these days to increase link capacity and spectral efficiency. MIMO is used in Wi-Fi, LTE, 4G, 5G and other wireless technologies. This paper describes the earlier history of MIMO-OFDM and the antenna beam forming development in MIMO and types of MIMO. Also this treatise describes several decoding algorithms. The MIMO combined with OFDM increases the channel capacity. But the main problem is in estimating the transmitted signal from the received signal. So the channel knowledge is to be known in estimating the channel capacity. The advancement in MIMO-OFDM is Massive MIMO which is beneficial in providing additional data capacity in the increased traffic environment is described. In this memoir various application scenarios of LS-MIMO which increases the capacity are discussed.

A Speculative Approach to Design A Hybrid System for Green Energy

Now a days demand of energy is increasing all over the world. Because of this demand the fossils fuels are reducing day by day to meet the requirements of energy in daily life of human beings. It is necessary to balance the situation for the increasing energy demand by taking an optimistic overview about the natural renewable energy sources like sun, gust, hydro etc.,. These energy sources only can balance the situation of unbalancing between fossil fuels and increasing energy demand. Renewable energy systems are suitable for off grid services in power generation, to provide services to remote areas to build complex grid infrastructures. India has the abundant source of solar and wind energy. Individually these energy sources have some own advantages and disadvantages; to overcome the disadvantages of individual energy sources we can combine all these sources to make an efficient renewable source nothing but hybrid renewable energy source. In this paper we proposed a hybrid model which is a combination of four renewable energy sources solar, wind, RF signal and living plants to increase the energy efficiency.

Pre-Coding using Different Detection Algorithms in MIMO System

Pre-coding is a general understanding of beam-forming to achieve the transmission diversity of the signal. Basically transmitter sends the information which is already coded according to the known knowledge about the channel conditions to the receiver. The pre-coding technique leads to achieve a good performance by eliminating the degradation effects even in the correlation environment upon the channel in the communication system. In this paper, the different detection algorithms: Zero forcing (ZF), Minimum mean square error (MMSE) and Block diagonalization (BD) are used in pre-coding. Many solutions have been proposed for the Co-Channel Interference problem. The main aim of this paper is to select the most suitable Coding techniques to adopt. The analysis is carried by assuming the channel as Rayleigh and modulation scheme is QPSK with

A roadmap to the realization of wireless body area networks: A review

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Optical properties of chalcogenide glass microstructured optical fiber: An analytical field model

MIMO system.

Highly sensitive refractive index sensor based on Bragg grating in metallic-hole microstructured optical fiber

Wireless Body Area Network (WBAN) is extremely useful emerging technology having enormous utilities and benefits in everyday life not only for health care but also for athletic guidance, public protection, and end user electronics. With the arrival of less power and inexpensive wireless connectivity innovations, Body area Networks could be implemented using available complementary technology. Nonintrusive, miniature wearable sensors allow compilation of large amount of information mechanically, decreasing the cost and decreasing of regular visits to the doctor. In this paper, a comprehensive survey on the various aspects of the WBAN consisting of stand-alone sections on the standards for WBAN, Challenging issues of WBANs, key security necessities for information security and privacy furthermore different applications of WBANs are discussed.

Characteristics of square-lattice microstructured optical fibers: An analytical field approach

We study analytically the light guiding properties of the chalcogenide glass based solid core or index-guiding microstructured optical fiber with the hexagonal and the square lattice of circular voids or air-holes in the cladding. The effective index of the fundamental mode, the group velocity dispersion and the effective mode area with different configurations of MOF has been calculated. Comparisons with the numerical simulation results have been included.

A Survey on Path Loss Models Used In Wireless Communication System Design

We present a theoretical comparative study of a highly sensitive Bragg grating sensor written in a microstructured optical fiber with bare and metallic voids or holes. Based on the full vector effective index method and the coupled mode theory our simulations show that the device is maximum sensitive for small metal thickness showing nearly double sensitive at 10 nm metal thickness as compared to that for the bare hole. This highest sensitivity is comparable to the maximum sensitivity reported for the pure surface plasmon polariton based Bragg gratin sensors and, unlike the later, the modes are easy to excite for the present sensor. Owing to the reflective mode operation the device is ideally suited for highly sensitive, remote deep sea and oil well sensing applications.

Different Watermarking Techniques & its Applications: A Review

Using our earlier developed analytical field model we have studied the modal properties of index-guiding or solid-core microstructured optical fibers with square-lattice of circular voids or air-holes in the photonic crystal cladding made with high nonlinearity non-silica glass composition material as well as fused silica glass. For comparison the numerical simulation results have been included.