Journal of Engineering Technology and Sciences

With the growing need for portable devices to have high-speed, energy-efficient, and compact systems, power optimization has recently emerged as a crucial concern. Today's portable design is still based on Complementary Metal Oxide Semiconductor (CMOS) technology because of its high integration density and low power dissipation. Although scaling is still ongoing, power consumption issues, which are usually both stationary and dynamic, must be resolved to preserve battery life and dependability in next devices.

Keywords : Low power electronics, portable devices, CMOS technology, energy-efficient design, power optimization and dynamic power dissipation, and static power reduction

Author : Venkata Ramana

Title : Power Optimization on Portable Devices CMOS/VLSI Circuit

Volume/Issue : 2025;02(02)

Page No : 01-04

LoRaWAN is expected to be one of the key elements of the Internet of Things using long range, low power wireless telecommunications. LoRaWAN enables end appliances to communicate within a single hop through a gateway to the Internet. These gateways serve to unify two end devices with a central network server which is the transparent pathway of messages from the end devices. This technology, which combines long range, low battery consumption and secure data transmission is proving to be very popular in Internet of Things networks that wireless network carriers are introducing. However, the public inventory of the technology is not as through an assessment. The main purpose of this paper is to study the influence of shadowing over LoRaWAN networks and determine the performance in terms of packet loss ratio for different physical layer configurations. This shows that the intended performance has significant performance variances that are sufficiently disruptive when shadowing is taken into consideration.

Keywords : Long range, wireless communication, low power wide area network, Internet of things

Author : Sasidhar

Title : Shadowing Impact on LoRa LPWAN Radio Links

Volume/Issue : 2025;02(02)

Page No : 05-08

Access to power at all times has become essential for a nation's sustained development in the modern era. One of the main obstacles to Bangladesh's economic growth is the power crisis. Bangladesh does not have a reserve for fossil fuels. In Bangladesh's coastal regions, the abundance of renewable energy sources, such as wind and sun, offers prospects for hybrid energy systems based on renewable energy. Energy production using a hybrid system lowers generation costs and contributes to energy cost parity. Once more, a hybrid energy system with independent renewable energy will lower grid load demand and be environmentally benign. This study suggested an affordable standalone solar-wind-diesel hybrid power system architecture for a Bangladeshi coastal region. A hybrid power system simulation was conducted while taking into account various variables for a coastal area design. A thorough economic analysis and comparison with diesel- and solar-powered energy systems make it abundantly evident that the suggested hybrid power system is a financially sensible option for Bangladesh's coastal regions.

Keywords : ind energy, solar energy, standalone energy systems, renewable energy, coastal areas, and hybrid energy systems

Author : Rehaman

Title : Coastal Areas: A Standalone Solar Wind Diesel Hybrid Energy System

Volume/Issue : 2025;02(02)

Page No : 10-12

Power plants need performance analysis on a regular basis to reach their operational maximum efficiency levels. Researchers studied the performance of a 400/220 kV 630 MVA power plant as the main subject for analysis. The research shows that the transformer station (installed station) features immense capacity in comparison to the load it distributed during its underutilized and underloaded operations. The station became less efficient in operation at the same time when the incoming voltage reached higher levels than its designed voltage limits. The dependence of power supply became at risk when one of the 400 kV inbound lines experienced trips under off-peak loading conditions. Through this examination researchers present several recommendations along with insights to improve both performance and loading pattern optimization at the power plant facility.

Keywords : Station capacity, performance analysis, energy audit, energy efficiency, and bus reactor

Author : SK Mohammad Khan

Title : Analyzing a Power Plant's Performance for Operational Improvement

Volume/Issue : 2025;02(02)

Page No : 13-15

Multiple-Input A crucial component of contemporary wireless communication systems, multiple-output (MIMO) technology improves spectrum efficiency, dependability, and data speed. MIMO uses several antennas at the transmitter and receiver to take advantage of multiplexing advantages and spatial diversity to increase system capacity and signal quality. The three main MIMO techniques—beamforming, spatial multiplexing, and spatial diversity—each address distinct performance goals. While spatial multiplexing boosts data throughput by sending separate data streams, spatial diversity reduces fading effects by sending redundant signals over many pathways. By directing signal energy towards the intended receivers in the best possible way, beamforming enhances interference suppression and the signal-to-noise ratio. MIMO is essential to modern standards like Wi-Fi, LTE, and 5G and is vital to the development of wireless communications. This study examines the fundamental ideas, advantages, difficulties, and uses of MIMO systems, emphasizing their importance in next-generation wireless networks.

Keywords : Multimedia, wireless, B-splines, Video coding, Low bit rate

Author : Syam Sundar

Title : Case Study of MIMO Concepts

Volume/Issue : 2025;02(02)

Page No : 16-18