May 20

The IUP Journal of Telecommunications

Focus

In efficient wireless networks, the interference reduction and usable spectrum efficiency enhancement have always been a concern to system developers. Theoretical modeling and experimental implementation of prototyping of Multiple-Input and Multiple-Output (MIMO) wireless systems have confirmed an order of magnitude improvement in Spectral Efficiency (SE) for a typical point-to-point communication link. Similarly, efficient modulation schemes have also become a research interest in achieving a higher data rate at a given Quality-of-Service (QoS). The emerging fifth-generation network envisages small cell network design by exploiting the potential of low power consumption and thereby realizes a green communication and energy-efficient system.

This issue contains five papers emphasizing the potential and capabilities of 5G networks adopting MIMO, OFDMA and other suitable reliability enhancement techniques. The first three papers deal with the MIMO and multicarrier-based link improvement research, while the other two are related to capacity demand and network backbone reliability. The first paper, "Challenges and Evaluation of Massive MIMO System Capacity Bounds for 5G Cellular Networks", by Amjad Quazi, Sanjeev Kumar Gupta and Paresh Rawat, studies the implementation of the massive MIMO system in the 5G cellular networks. In this paper, the lower bounds of the system capacity with respect to number of antennas have been proposed and tested. It is observed that the massive MIMO technique improves the network efficiency.

The capacity of a wireless network can be enhanced by increasing the number of transmitting and receiving antennas by mitigating the multipath fading and also incorporating the space diversity. The second paper, "Performance Evaluation of MIMO OFDM System Using Adaptive Modulation and Coding Technique", by Gyanender Kumar and Johnny Dogra, explores several techniques to capture the channel information and further discusses some policies and feasible solution to implement Adaptive Modulation Coding (AMC). The performance of AMC has been evaluated by calculating probability of Bit Error Rate (BER) under the Additive White Gaussian Noise (AWGN) wireless channel models.

The third paper, "Application of Green Communication in Energy-Saving Transmissions of OFDMA-Based Multicarrier Base Stations", by Ravi Shankar, Khushboo, Mrinal Darshan and Ritesh Kumar Mishra, discusses the green energy issues in wireless networks. The authors have proposed a new algorithm exploiting the green communication techniques to solve the power issue at the cellular base station transceiver by maintaining the QoS. The paper has considered the Orthogonal Space-Time Block Code (OSTBC) component carrier for downlink transmission of the base station.

The wireless network usability is also determined by the user density and customer demands of the coverage geographical regions involved. The fourth paper, "Estimation of Mobile Telecommunication Demand Using OLS Method with Qualitative Information to Test Economic Crashing Time", by Raufu Oluwatoyin Raheem, presents mobile consumer profile and their usable statistics based on mobile cellular monthly subscription in telecommunication industry. The results indicated that the higher the income, the higher would be the demand for mobile cellular telephone. The paper performs multiple regression and control algorithms for mobile cellular monthly subscription, GDP per capital, network investment and demand differential cost.

The last paper, "Reliability Modeling, Cost-Benefit Analysis with Inspection, Repair and Replacement Facility for Optical Fiber Network in DCRUST", by Puja Rani and Manoj Duhan, presents a survey on optical fiber network installed on a university campus and investigates its reliability , cost benefit and performance analyses. The proposed model includes an operative unit along with another standby unit as a protection link. The analysis helps in predicting profit versus failure rate, revenue/unit up time with distinct inspection rate values, failure and repair rates for future improvement of the existing system.

-V K Chaubey,
Consulting Editor

CheckOut
Article   Price (₹) Buy
Challenges and Evaluation of Massive MIMO System Capacity Bounds for 5G Cellular Networks
50
Performance Evaluation of MIMO OFDM System Using Adaptive Modulation and Coding Technique
50
Application of Green Communication in Energy-Saving Transmissions of OFDMA-Based Multicarrier Base Stations
50
Estimation of Mobile Telecommunication Demand Using OLS Method with Qualitative Information to Test Economic Crashing Time
50
Reliability Modeling, Cost-Benefit Analysis with Inspection, Repair and Replacement Facility for Optical Fiber Network in DCRUST
50
     
Contents : May 20

Challenges and Evaluation of Massive MIMO System Capacity Bounds for 5G Cellular Networks
Amjad Quazi, Sanjeev Kumar Gupta and Paresh Rawat

In the last decade, a lot of research has been done in the field for improving the Spectral Efficiency (SE) of the cellular wireless communicating channels. Multiple-Input and Multiple-Output (MIMO) technologies play a significant role in improving the overall efficiency of the system. The entire world is facing the major challenge of bandwidth crunch. Therefore, any work or contribution, which can improve the efficiency of the communication system, is a significant contribution to society. The paper presents a brief classification of the massive MIMO system designs, and the challenges are addressed. Initially, the MIMO system is introduced to increase SE by increasing the degree of freedom in space domain by multiple antennas. A large number of transmit-antennas provide more spectral and Energy Efficiency (EE) than conventional MIMO system. Then the massive MIMO system capacity bounds are evaluated considering the hardware impairment in the system. It is found that the performance of the channel estimation is essential for improving the overall efficiency of the massive MIMO system design. Mathematical modeling is given for evaluating the channel capacity; capacity is calculated and MIMO performance is evaluated.


© 2020 IUP. All Rights Reserved.

Article Price : ₹ 50

Performance Evaluation of MIMO OFDM System Using Adaptive Modulation and Coding Technique
Gyanender Kumar and Johnny Dogra

The main idea behind Adaptive Modulation Coding (AMC) is to change the Modulation and Coding Schemes (MCS) dynamically within the subsequent frame and to adopt the overall spectral efficiency to the channel condition. The selection of correct MCS is done at the receiver end on the basis of observed channel condition under the information supplied to the transmitter in every time frame. A number of significant works have been carried out on understanding the time adaptation aspect in AMC protocols, and the challenges in these methods occurred when the dynamic transmission techniques in the wireless networks are used, which have multiple signal dimensions. In this paper, the performance analysis of AMC is done using evaluation of Long-Term Evolution (LTE) and by calculating the probability of Bit Error Rate (BER) under the Additive White Gaussian Noise (AWGN) wireless channel models. AMC model is constructed in MATLAB under Gaussian (AWGN) to analyze the performance in BER, data delay and throughput.


© 2020 IUP. All Rights Reserved.

Article Price : ₹ 50

Application of Green Communication in Energy-Saving Transmissions of OFDMA-Based Multicarrier Base Stations
Ravi Shankar, Khushboo, Mrinal Darshan and Ritesh Kumar Mishra

Green communication technology provides energy-saving implementation of mobile communication network in the fast growing digital communication field. Power consumption at the cellular base station has become an important problem in mobile wireless communication. The paper proposes a new algorithm based on green communication technology for solving the power issue, power reduction at the cellular base station transceiver with consideration of Quality-of-Service (QoS) and equality conditions of each cellular subscriber. The paper uses Orthogonal Space-Time Block Code (OSTBC) component carrier for downlink transmission of the base station. The simulation results prove that the proposed scheme provides better energy-saving scheme compared to other energy-saving schemes.


© 2020 IUP. All Rights Reserved.

Article Price : ₹ 50

A Novel Technique with LoEstimation of Mobile Telecommunication Demand Using OLS Method with Qualitative Information to Test Economic Crashing Time
Raufu Oluwatoyin Raheem

Many countries have been facing the problem of how to represent the economic downtime, economic crashing or economic recession in order to make appropriate decision or policy intervention. For this purpose, the paper estimates mobile telecommunication demand for 10 years of 27 countries using Ordinary Least-Square (OLS) method with qualitative information as dummy variable. The dummy variable examines the economic crashing time in South Korea during 1997. The paper uses price of mobile (mobile cellular monthly subscription) in telecommunication industry, income of consumers and investment as three independent variables, while the number of mobile cellular telephone subscribers per 100 inhabitants is used as dependent variable. The results indicate that the higher the income, the higher would be the demand for mobile cellular telephone subscribers per 100 inhabitants and investment has no effect as t-statistic is less than 2. In the same manner, the dummy variable has no statistical significance at 5% level on the demand for mobile telecommunication during economic crashes. This implies that the effect of economic crash or economic downtime in South Korea in 1997 is statistically insignificant in relation to demand for mobile telecommunication.


© 2020 IUP. All Rights Reserved.

Article Price : ₹ 50

Reliability Modeling, Cost-Benefit Analysis with Inspection, Repair and Replacement Facility for Optical Fiber Network in DCRUST
Puja Rani and Manoj Duhan

The paper makes a survey of the optical fiber network installed at Deenbandhu Chhotu Ram University of Science and Technology (DCRUST) using reliability analysis, cost-benefit analysis and performance evaluation. Various reliability modeling-related aspects to calculate the reliability of the system have been analyzed. The proposed Markov model includes two units: one is operative unit and the other is hotstandby unit. Hotstandby unit is an optical fiber-based ring which acts as a protection ring. Operative unit is Optical Fiber Cable (OFC) of DCRUST. If working path (operative unit) fails, communication is done through protection path (hotstandby); if both units fail, then the whole system fails. Inspection, repair and replacement are done by regular repairman. The paper also includes a study of various measures of system effectiveness, different reliability parameters to evaluate profit and other measures related to the system. Graphical analysis between various system parameters has also been made.


© 2020 IUP. All Rights Reserved.

Article Price : ₹ 50

Upload Articles
Click here to upload your Articles

Journals


Magazines


Articles of the Month
ISBN: 978-81-314-2793-4
Price: ₹250
Payment by D.D. favouring
"ICFAI A/c IUP", Hyderabad

Reach us at
info@iupindia.in
Tel: +91 8498843633