VOLUME 8, ISSUE 1, JANUARY 2020

Abstract: In wireless communication, higher data rates can be achieved by increased or more efficient use of bandwidth and transmitting power. A key technique for spectral optimization is Orthogonal Frequency Division Multiplexing (OFDM). OFDM is a technique proposed for high-speed wireless LAN by the European Telecommunication Standards Institute and IEEE which is being considered for 4G mobile. OFDM technology is described for physical layer of ETSI’s proposed HIPERLAN standard whose data rate ranges from 6 to 54 Mbit/s depending on Quality of Service (QoS). It is designed to provide Wireless Local Loop (WLL) to core networks, e.g. Asynchronous Transfer Mode, GSM/UMTS or any IP-based multimedia network. Data rate, coding rate and modulation type are determined by the link adoption scheme automatically depending on the channel conditions. There are several ways to utilize the frequency band in a flexible way so that the available bandwidth is utilized to maximal efficiency. These access techniques uses a small portion of available energy with low power spectral density, high data transmission rates, less intercarrier interference and efficient use of bandwidth. The main cause of interference in OFDM system is channel fading, and all the errors are in transmission occurred due to effects of channel. One method that can be implemented to overcome this problem is by introducing channel coding. Channel encoding is applied by adding redundant bits to the transmitted data. The redundant bits increase raw data used in the link and therefore, increase the bandwidth requirement. So, if noise or fading occurred in the channel, some data may still be recovered at the receiver. While at the receiver, channel decoding is used to detect or correct errors that are introduced to the channel.

Keywords: HIPERLAN, OFDM, BER

Abstract: Voice recognition is a method of security that can be accessed almost by everyone. It provides those with visual impairments the same level of security as those without. Similarly, technologies that require physical interaction may prove difficult barrier that other methods of technology may carry. Voice recognition systems are typically uti- lised in contact centres where there is no other method for physical authentication. However, it can be used across a wide range of industries such as: Hospitality, Retail and Logistics, and Banking and Finance. In this research paper we will introduce a method of creating human voiceprints based on using finite impulse response filter coefficients, this linear prediction coding method will be tested, implemented using various wave signal files to prove the act of how to identify the person and how to identify the spoken word or phrase, allowing the recognition system to use a voiceprint as a password.

Keywords: Digital Signal, Voice Signal, Voiceprint, FIR, LPC, Filter Order Recognition System, Correlation, MSE

Abstract: In wireless and mobile communication, where the size of the antenna is a limitation, micro strip patch antennas are more advantageous. Due to rapid growth in the wearable communication industry, Now-a-days textile antennas are more popular. Wearable antennas are found to have more advantages due to their small size and can be integrated into a personal accessory. In this paper, we designed a narrow band textile patch antenna for an operating frequency of 2.8GHz with and without defective ground structure in the ground plane. The embedded DGS is a rectangular slot. The results are simulated using HFSS. The dimensions of the patch antenna are computed with high accuracy.

Keywords: Radiation Pattern, VSWR, Return Loss, Defective Ground Structure in Ground Plane (DGS), Gain

Abstract: Considering the current scenario of steady depletion of primary sources of energy, it is extremely critical to manage the consumption of power. Ensuring low wastage of power involves prediction of power consumption, which can enable generation of power according to the demand. This process is true for both micro-scale estimation and generation, for particular sectors in an urban or rural area, to macro-estimate of power requirements in terms of overall power consumed nationally, that can be further divided into sectors such as commercial and residential power consumption. The present work outlines a machine learning based linear spline regression-based approach to prediction of energy consumption which is an improvement on the standard spline regression based approach employed currently.

Keywords: Power Consumption, Estimation, Machine Learning, Linear Regression, Spline Regression

Abstract: Now a day’s electricity is very important part of human and technologies. Different types of electrical appliances like air conditioner, LED bulb, CLF bulb, fan, washing machine etc. are available in the market. They have different rating and energy consumption capacity. These electrical appliances divided into different categories according to power consumption, such as 1 star, 2 star, 3 star, 4 star and 5 star electrical appliances. In this paper, analysis of different electrical appliances with their energy consumption, calculate of unit’s consumption and energy cost comparison of different star rating appliances. Discussion of energy saving using different star rating appliances. Also calculate of payback period for different appliances.

Keywords: Air conditioner; LED bulb; CFL bulb

Abstract: Digital video broadcasting – Terrestrial standard as the one which actually is modifying the existing analog standards existing currently across the globe. The most important part of such standards is the retrieval of perfect signal at the receiver end excluding the effects of the channels it goes through and the noise and timing jitter. In the transmission being carried out, the data – either audio – video or any picture information or randomized data is processed for Coded Orthogonal Frequency Division Multiplexing (COFDM) before they are modulated using QAM – Quadrature Amplitude Modulation constellation and mapped in the group of blocks. After formation of the blocks, IFFT – Inverse Fourier Transform is carried out with point 2048 or 8192, which will determine bandwidth requirement and number of subcarriers. Some of these subcarriers are kept in reserve to be used for the pilot symbols – much needed for efficient reception of the signals, whereas the others are to be used for guard bands as well. Though there are many virtues of implementing DVB-T system, there are many shortcomings too of the same which cannot be neglected. The very first limitation and an important one too, is in the form of bit error rates supported by it. They are limited and not compatible with the existing and rapidly changing wireless standards. For the transmission of HDTV – high-definition television and also for accommodating more channels for broadcasting, there was a strong need of new standard. The second limitation of the DVB-T system is its hugely inferior performance with portability or mobility which restricted its usages in moving vehicles.

Keywords: DVB-T, OFDM, BER, RS