Effect of Adaptive Modulation and Coding Schemes on Scheduling Algorithms for LTE Downlink

Long Term Evolution (LTE) network uses Radio Resource Management (RRM) mechanisms such as Scheduling and Adaptive Modulation and Coding (AMC) for realizing Quality of Service (QoS) requirements and optimizing system performance. Scheduling is the process of dynamically allocating physical resources to User Equipments (UEs) based on scheduling algorithms implemented at MAC sublayer of the LTE base station. Whereas AMC is Link Adaptation functionality of LTE Physical layer to enhance higher system performance. AMC scheme adopted in LTE Downlink depends on the channel quality Index (CQI) feedback from User Equipments. Hence in this paper, an attempt has been made to study and compare the performance of Blind Equal Throughput (BET), Maximum Throughput (MT) and Proportional Fair (PF) scheduling algorithms for Downlink connections with AMC (64 QAM, 16 QAM and QPSK regions) for Constant Bit Rate (CBR) traffic scenario. Performance metrics considered for simulation studies are throughput, delay, jitter and fairness. From the simulation results it is evident that the throughput, delay, jitter and fairness performances of the considered scheduling algorithms are better in 64QAM region. Also, MT scheduling algorithm achieves better throughput and BET scheduling algorithm achieves better fairness

The Study and Analysis of Effect of Multi- Antenna Techniques on LTE network with Different Bandwidth Configurations in the Downlink

Long Term Evolution (LTE) system adapts advanced Multiple Input Multiple Output (MIMO) antenna techniques on both uplink and downlink to achieve high peak data rates and higher system throughput. This enables LTE to support multimedia applications beyond web browsing and voice, which demands higher bandwidth configurations. LTE employs Orthogonal Frequency Division Multiple Access (OFDMA) in downlink to support spectrum flexibility in order to use upto 20MHz system bandwidth to improve the system throughput and robustness. Therefore the combined study of multi-antenna techniques and spectrum flexibility usage on the performance of LTE system becomes vital. Hence in this paper, an attempt has been made to evaluate the performance of different multi-antenna techniques with various system bandwidth configurations from 1.4MHz to 20MHz using QualNet 5.2 network simulator. The multi-antenna techniques considered for performance evaluation are Single Input Single Output (SISO), Multiple Input Single Output (MISO) and Multiple Input Multiple Output (MIMO). The performance metrics such as aggregate bytes received, average throughput, average delay and average jitter are considered for simulation study

he Study and Analysis of Effect of Multi-Antenna Techniques on LTE network with Different Bandwidth Configurations in the Downlink

Long Term Evolution (LTE) system adapts advanced Multiple Input Multiple Output (MIMO) antenna techniques on both uplink and downlink to achieve high peak data rates and higher system throughput. This enables LTE to support multimedia applications beyond web browsing and voice, which demands higher bandwidth configurations. LTE employs Orthogonal Frequency Division Multiple Access (OFDMA) in downlink to support spectrum flexibility in order to use upto 20MHz system bandwidth to improve the system throughput and robustness. Therefore the combined study of multi-antenna techniques and spectrum flexibility usage on the performance of LTE system becomes vital. Hence in this paper, an attempt has been made to evaluate the performance of different multi-antenna techniques with various system bandwidth configurations from 1.4MHz to 20MHz using QualNet 5.2 network simulator. The multi-antenna techniques considered for performance evaluation are Single Input Single Output (SISO), Multiple Input Single Output (MISO) and Multiple Input Multiple Output (MIMO). The performance metrics such as aggregate bytes received, average throughput, average delay and average jitter are considered for simulation study

Performance Evaluation of Mobility Effects on Various Transmission Modes in the LTE Network

Long Term Evolution (LTE) system uses Internet Protocol (IP) based network architecture and advanced multi-antenna techniques to provide higher system throughput and high user mobility, intern to support low delay multimedia services such as voice, real time video connections and effective internet connectivity without any disruption. Hence in this paper, an attempt has been made to analyze the impact of mobility on the Quality of Service (QoS) parameters such as average throughput, average jitter and average delay of a LTE network for various transmission modes such as Serial-Input Serial-Output (SISO), Transmit Diversity, Receive Diversity and Open Loop Spatial Multiplexing (OLSM)

Wireless Portable Microcontroller based Weather Monitoring Station

Weather monitoring and its forecasting has become vital part of day-to-day life because of its numerous applications in agriculture, farming, fishery, shipping and military operations. Measuring the weather using conventional or manually operated Weather Monitoring Stations requires skilled labor for operation and demands regular maintenance which invariably increases the life cycle cost of the Weather Monitoring Station. To address these issues, the authors of this paper have attempted to design and implement inexpensive Wireless Portable Weather Monitoring Station using PIC16F887 microcontroller. The implemented Weather Monitoring Station is equipped with sensors to measure weather variables such as relative humidity, atmospheric pressure, rainfall, solar radiation, wind speed, wind direction, surface and ambient temperature. Besides of these capabilities, the designed Weather Monitoring station also includes some unique features like Modbus communication protocol, which provides seamlessly communication of real time weather measurements to the base station (PC Laptop) over both wired (RS serial) and wireless (Xbee Pro modules) interfaces. Further, at the base station, the received data is logged and uploaded to an online data server to enable worldwide ubiquitous access to the weather measurements. © 2015 Elsevier Ltd. All rights reserved

Effect of Noise Factor on System Performance in LTE Networks

The 3GPP Long Term Evolution (LTE) technology provides higher system throughput over Broadband Wireless Access (BWA) telecommunication systems in order to meet the escalating demands of multimedia services. In such systems, the higher noise factor at the base station (eNB) degrades the system throughput, since the increase in noise factor at the eNB decreases the Signal to Noise Ratio (SNR) of the received signal. Thus the network deployment with lower noise factor at the eNB support higher system throughput and it is essential to provide high Quality of Services (QoS) in LTE networks. Hence in this paper, an attempt has been made to study and evaluate the effect of various noise factors at the eNB on system performance in uplink LTE network using QualNet 7.1 network simulator. The performance metrics considered for the simulation studies are spectral efficiency, system throughput, total numbers of data bytes received, total numbers of transport blocks received with errors, delay and jitter

Effect of Bandwidth Scalability on System Performance in the Downlink LTE Systems

Long Term Evolution (LTE) system employs Orthogonal Frequency Division Multiple Access (OFDMA) in downlink in order to support network deployment using various system bandwidth configurations i.e., 1.4MHz, 3MHZ, 5MHz, 10MHz, 15MHz and 20MHz. The bandwidth scalability enables operator to access multiple channels to achieve higher peak data rates. Also, the bandwidth scalability allows operators to deploy LTE network with the existing spectrum or newly licensed band. Therefore the study on performance of LTE system with different bandwidth configuration becomes vital. Hence in this paper, an attempt has been made to study and compare the performance of LTE system with different spectrum configuration i.e., 1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz and 20MHz for Constant Bit Rate (CBR) traffic scenario in the downlink. The performance metrics considered for simulation studies are aggregate bytes received, average throughput, average delay and average jitter