44 research outputs found
Performance Evaluation of Multi Antenna Techniques in LTE
High data rate requirements of the Long Term Evolution - Advanced (LTE-A) systems can be achieved by adopting advanced Multiple Input Multiple Output (MIMO) antenna techniques on both uplink and downlink. The LTE air-interface supports multiple-antenna transmit arrays and different modes of multiple antenna transmissions. In this paper, performance of different MIMO techniques is evaluated using QualNet network simulator. The MIMO techniques considered for performance evaluation are SingleInput/Multiple-Output (SIMO), Open Loop Spatial Multiplexing (OLSM) and Space-Frequency Block
Coding (SFBC). The performance metrics considered are throughput, delay and jitter
Performance Study of Round Robin and Proportional Fair Scheduling Algorithms by Emulation for Video Traffic in LTE Networks
Video communication over mobile broadband is gaining
popularity due to the increased demand for applications such as Video on Demand (VoD), IPTV, video conferencing etc. In order to support these video applications over mobile broadband, efficient video streaming within the limited bandwidth environment is essential. Further, Long Term Evolution (LTE) network incorporates advanced Radio
Resource Management (RRM) mechanism such as scheduling
to realize efficient video streaming over limited bandwidth arena. Scheduling does the task of dividing and allocating radio resources in order to maximize system throughput and enhance Quality of Experience (QoE) of the end user. Hence, in this paper an attempt has been made to evaluate the performance of Round Robin (RR) and Proportional Fair (PF) scheduling algorithms using EXata network emulator for real video traffic generated by Video LAN (VLC) media player. Packet Delivery Ratio (PDR) and throughput are considered as performance metrics for the emulation studies
Performance Study of Proportional Fair Scheduling Algorithm with Transmit Diversity Multi-Antenna Technique for Lte Network
Long Term Evolution (LTE) access network is based on Orthogonal Frequency Division Multiple Access (OFDMA) which provides multi user diversity gain to enhance the system throughput. However, fading of a radio channel causes inter channel interference and reduces overall system throughput. This deteriorating effect of wireless channel fading is higher for mobile users which can be reduced by channel aware scheduling algorithm and transmit diversity multi-antenna technique. Hence in this paper, an attempt has been made to evaluate the effect of mobility on the performance of Proportional Fair (PF) channel aware scheduling algorithm in conjunction with transmit diversity multi-antenna technique by considering throughput, delay and jitter as performance metrics.
NINE-PROFILE AND NINE-SEGMENT TEMPERATURE PROGRAMMER FOR MASHING APPARATUS
Mashing is a process of converting the grain starch into fermentable sugar by activating the malt enzymes using a hot-water steeping process. A microcontroller-based nine-profile, nine-segment temperature programmer and four-channel temperature and rpm (rotations per minute) display system for the mashing apparatus has been designed and implemented using a PIC 16F887 microcontroller. In this apparatus, a pulse width modulation (PWM)-based programmable AC voltage controller has been designed to vary mash tub temperature at required rate, and the resistance temperature detector (RTD) PT100 has been used to measure the temperature of the mash tub and sample. The software for the microcontroller has been developed using C language to set the end temperature and time of the nine segments of nine temperature profiles through the keypad and also to implement the proportional integral and derivative (PID) controller to control the temperature of the mash tub as per user settings
Performance Evaluation of VoIP in Mobile WiMAX; Simulation and Emulation studies
Worldwide Interoperability for Microwave Access (WiMAX) is an acronym for IEEE 802.16 family which is a leading contemporary broadband wireless Access (BWA) technology. IEEE 802.16e is intended for mobile WiMAX, which supports vehicular mobility with the stringent quality of service
(QoS) parameters for various data traffics. Voice over IP (VoIP) provides low cost, modern telephony which can become a better alternative for classical telephony; however there are some issues need to be addressed prior to the deployment of any new technology. Significance of simulation study results can be verified and assessed by emulation testbed results. It is expected that both the results should match closely with each other. This paper makes an effort to study the performance evaluation of VoIP for a mobile user and how the QoS parameters vary for different speeds. The simulation and emulation of a
mobile WiMAX system using EXata 2.0.1 are performed. The effectiveness of the comparison of results is
discussed
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
Performance Evaluation of Reactive Routing Protocols for IEEE 802.11
The progress of communication technology has made wireless devices smaller, less expensive and more powerful. This has initiated everyone to use various wireless network technologies such as 3G, 4G of cellular network, Ad-Hoc, IEEE 802.11 based Wireless Local Area Network (WLAN) and Bluetooth. The performance of the routing protocols AODV, DSR and LAR are compared using Qualnet 5.0.2.Network Simulator with the metrics like average jitter, throughput, end-to-end delay, total number of bytes received and packet delivery ratio successfully routed to their destination
MODULATION AWARE CONNECTION ADMISSION CONTROL AND UPLINK SCHEDULING ALGORITHM FOR WIMAX NETWORKS
Mobile WiMAX standard defines air interface for mobile broadband wireless access (BWA) systems and
aimed to provide high data rate with seamless mobility while maintaining the quality of service (QoS).
However, QoS of real-time applications depends on the link quality, which necessitate the channel-aware
connection admission control (CAC) and scheduling schemes. In this paper Modulation aware CAC
scheme and base station (BS) uplink scheduling algorithm are proposed to improve the system capacity and
QoS performance respectively. The proposed CAC scheme aims to increase the admission of higher priority
real time services by degrading the bandwidth of admitted lower priority connections on the basis of their
channel status without deteriorating their QoS performance much. The performances of proposed
algorithms are evaluated through simulation by considering the metrics like throughput, delay and number
of connections admitted
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 Connection Admission Control for IEEE 802.16 Networks
Quality of Service (QoS) provisioning to the various kinds of network traffic is one of the major design criteria of IEEE 802.16 WiMAX standard. The MAC and physical layers of
802.16 standards are designed to support different types of real time application by providing QoS. Scheduling, Connection Admission Control (CAC) and traffic policing are the major issues to ensure QoS. In standard, scheduling and admission control are kept as open issues. Admission control is the ability of a network to control admission of new traffic based on the availability of resources. As per the specification the CAC
considers minimum reserved rate of a connection as an
admission criterion, in which the system can admit more
connections, but packets of admitted connection may encounter large delays. In this paper average data rate (avg-rate CAC) and maximum sustained rate (max-rate CAC) of the connections are considered as admission criteria in CAC, along with minimum reserved rate (min-rate CAC). The performance of the WiMAX network is evaluated and compared for min-rate, avg-rate and max-rate CAC by considering the performance metrics such as number of connections admitted, throughput and delay using QualNet simulation tool