Jan'19

The IUP Journal of Electrical and Electronics Engineering

Focus

Centralized version controls like subversion are used by programmers to manage the changes to their software when checking or debugging. Software development is changing from Centralized Version Control Systems (CVCSs) to Decentralized Version Control Systems (DVCSs) like Git due to a number of reasons like time, space, branching, merging, etc. The paper, “The Transition from Centralized (Subversion) VCS to Decentralized (Git) VCS: A Holistic Approach”, by Vinay Singh, Alok Aggarwal, Adarsh Kumar and Shailendra Sanwal, investigates the transition process from subversion VCS to Git VCS. Capabilities essential for a complete migration from subversion to Git are identified.

In the wireless communication systems, data is sent in the form of codes and decoded at the receiver side. Convolution codes—recursive or non-recursive—are widely used for coding the input data and correcting the errors at the receiver side. The paper, “Two Efficient Schemes for Providing Feedback Connection to Recursive Convolution Encoder”, by Simmi Garg, Anuj Kumar Sharma and Anand Kumar Tyagi, analyzes the recursive encoder which is obtained from non-recursive encoder using feedback. Different feedback schemes are studied using Quadrature Amplitude Modulator (QAM) and Phase Shift Keying (PSK) modulations.

Large-Scale Multiuser Multiple Input Multiple Output (LS-MU-MIMO) wireless communication systems provide increased data rate by spatial multiplexing in cellular communication systems. In the paper, “Large-Scale MU-MIMO for Future Generation Wireless Communication Systems: Benefits and Research Issues”, by Jagtar Singh and Deepak Kedia, the performances of Zero Forcing (ZF) and Maximum Ratio Transmission (MRT) are analyzed. Linear precoding technique using ZF is found to be optimum for achieving required sum rate as compared to MRT precoding technique. The performance of MU-MIMO system in terms of spectrum and power efficiencies by varying antennas at Base Station (BS) is also studied.

The switch mode DC-DC converters are used in computer power supplies, servo motor drives, medical equipments, etc. Luo converter is a recently developed DC-DC converter. The paper, “Simulation and Experimental Validation of Intelligent Controllers for Negative Output Triple Lift-Luo Converter”, by N Dhanasekar, C R Balamurugan and S Soundarya, deals with the Triple-Lift Luo Converter (TLLC) used for controlling DC output voltage. The authors present implementation of PI, fuzzy and neuro controllers using TMS320C242 Digital Signal Processor (DSP). The experimental results confirm that neuro control gives output voltage regulation for both line and load disturbances with less settling time and less peak overshoot.

- MSR Murty
Consulting Editor

CheckOut
Article   Price (₹) Buy
The Transition from Centralized (Subversion) VCS to Decentralized (Git) VCS: A Holistic Approach
50
Two Efficient Schemes for Providing Feedback Connection to Recursive Convolution Encoder
50
Large-Scale MU-MIMO for Future Generation Wireless Communication Systems: Benefits and Research Issues
50
Simulation and Experimental Validation of Intelligent Controllers for Negative Output Triple Lift-Luo Converter
50
       
Contents : (Jan'19)

The Transition from Centralized (Subversion) VCS to Decentralized (Git) VCS: A Holistic Approach
Vinay Singh, Alok Aggarwal, Adarsh Kumar and Shailendra Sanwal

In recent years, software development in software industries has witnessed a transition from Centralized Version Control Systems (CVCSs) to Decentralized Version Control Systems (DVCSs) due to a number of reasons like time, space, branching, merging, offline commits and builds and repository. Both centralized VCSs like subversion, mercurial, perforce, CVS, etc. and distributed VCSs like Git have gone through ample investigations in the recent past, but individually from the software developer’s point of view in a large commercial software industry. There has not been much focus on the transition across Git and Subversion. Git has a share of more than three-fourths of total VCS and Subversion has a share of 13.5%. The paper investigates the transition process from Subversion VCS to Git VCS. Two major tools, Svn2Git and SubGit, used for transition from Subversion to Git, have been explored in terms of cost, support, resources, safety, dependence, rework, data loss etc. None of the available migration tools, including Svn2Git and SubGit, has three capabilities, namely, pre-migration, during migration and post-migration capabilities, which are essential for a complete migration from Subversion to Git. All three capabilities are explored along with the research areas in Subversion and Git migration.


© 2019 IUP. All Rights Reserved.

Article Price : Rs.50

Two Efficient Schemes for Providing Feedback Connection to Recursive Convolution Encoder
Simmi Garg, Anuj Kumar Sharma and Anand Kumar Tyagi

Convolution codes are widely used error correction codes in wireless communication systems. In recursive non-systematic codes, the output of the encoder is more dependent on the previous input bits. Hence, the weight factor of the coded data increases that lead to improvement in the performance of the transmission system. The paper proposes two schemes for making the feedback connections to the recursive convolution encoder. Using these schemes, different feedback connections can be provided to the encoder for improving the performance of the system. The first scheme implements a tri-state buffer with synchronous counters in the feedback connection, and in the second scheme, a negative feedback is provided to the encoder using a NOT gate. Simulations are done using MATLAB software. The two schemes are studied using 16, 32 QAM and 16 PSK modulation schemes over AWGN channel. The results show that the first scheme leads to decrease in the Bit Error Rate (BER) as compared to conventional scheme, and the second scheme has been able to achieve the performance of conventional system.


© 2019 IUP. All Rights Reserved.

Article Price : Rs.50

Large-Scale MU-MIMO for Future Generation Wireless Communication Systems: Benefits and Research Issues
Jagtar Singh and Deepak Kedia

The last decade witnessed an escalating growth in wireless devices. Because of the development of smart devices like mobiles, tablets and other data-intensive applications, wireless data traffic grows exponentially. In the present scenario and in the future, the wireless and fixed devices require high data throughput to support data-intensive applications such as video streaming to play online games, movies and real-time videos. The requirement of wireless throughput and number of wireless devices will be growing more in the near future. Moreover, the power consumption at Base Stations (BSs) is a growing concern for wireless communication systems. So the future wireless communication system has to fulfill the requirements of high throughput, less power consumption and serving many users simultaneously. To overcome the problems of increased data rates and power consumption at BSs, Large-Scale Multiuser Multiple Input Multiple Output (LS-MU-MIMO) is one of the solutions. LS-MIMO is new technology and has attracted considerable research attention recently. The paper provides information about theoretic concepts of MIMO starting from Single User MIMO (SU-MIMO) to LS-MU-MIMO. It also discusses the benefits, survey of precoding and detection techniques and research issues and analyzes the LS-MU-MIMO system in terms of spectrum and power efficiencies by varying antennas at BS.


© 2019 IUP. All Rights Reserved.

Article Price : Rs.50

Simulation and Experimental Validation of Intelligent Controllers for Negative Output Triple Lift-Luo Converter
N Dhanasekar, C R Balamurugan and S Soundarya

Triple-Lift Luo circuit is derived from elementary Luo converter by adding the lift circuit three times. Negative Output Triple-Lift Luo Converter (NOTLLC) performs the conversion of positive input to negative output DC-DC voltage with high power density, high efficiency and cheap topology in simple structure. Due to time variation and switching nature of the Luo converters, their dynamic behavior becomes highly nonlinear. The classical control methods employed to design the controllers for Luo converters depend on the operating point so that it is very difficult to select control parameters because of time varying loads and variable supply voltages. Conventional controllers require a good knowledge of the system and accurate tuning in order to obtain the desired performances. Hence, in this paper, intelligent controllers are designed and hardware implementation has been carried out using TMS320C242 Digital Signal Processor (DSP) for NOTLLC. The experimental results are analyzed under supply and load disturbances.


© 2019 IUP. All Rights Reserved.

Article Price : Rs.50

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