Entity

Time filter

Source Type

Mangalore, India

Jansi Rani S.V.,SSN College of Engineering | Narayanasamy P.,Anna UniversityTamil Nadu
International Journal of Applied Engineering Research | Year: 2016

Transmission control protocol (TCP) is implemented as a reliable data transfer protocol in wired networks which uses congestion control algorithms. Whenever there is a packet loss, it retransmits the lost packet. Packet loss is identified by two ways, on receiving three duplicate acknowledgments and on expiry of retransmission timeout. TCP is no longer reliable in wireless networks. The non-congestion retransmission timeout have been reported as one of the main problem of performance degradation of TCP in wireless network. Mainly there are two types of non-congestion retransmission timeout. They are spurious retransmission timeout due to sudden delays and random packet loss due to transmission errors. On spurious retransmission timeout, if multiple packets gets delayed continuously there occurs false fast retransmission which degrades TCP’s performance drastically. The proposed method identifies spurious retransmission timeout and improves TCP throughput. © Research India Publications. Source


Shanthi T.,Kings College | Krishnamurthi V.,Anna UniversityTamil Nadu
International Journal of Applied Engineering Research | Year: 2015

Wireless Sensor Network (WSN) is basically an energy starving network. The key issue in WSN is energy management, as these devices are battery operated devices and most of their powers are utilized in transmission and reception of radio signals. In heterogeneous environment, since each heterogeneous wireless sensor node (HWSN) has its own transmitting and receiving capability, they loss their energy faster than the homogeneous nodes. Behavior of radio conditions makes HWSN to drain their battery power which is the primary concern. Introducing Cognitive Radio Science into a heterogeneous WSN is one way to analyze the radio capability in a given area. We propose a Cognitive Radio based Heterogeneous Wireless Sensor Area Network (CoRHAN), where Cognitive radio enabled device is integrated into a Heterogeneous Wireless Sensor Network. CR device scans the radio capability of HWSNs at a given instant of time, analyze to decide which sensor node with radio capability has the maximum communication capability with reliable transmission so as to send the packet faster rather than forwarding packets to the nodes which have less radio capability. CR device analyzes radio resources collectively in-order to fully utilize the best of different wireless technologies thereby provide reliable radio services effectively and efficiently through optimal radio selection scheme. It observes radio resource utility, verify and update it‟s local detection statistics for dynamic decision making by thresholding its detection statistics. In such case, the CR becomes more efficient in data gathering and data collection. In addition, based on environmental conditions the CR is able to scan the radio parameters and collect as much as data possible avoiding multi-path congestion within the WSN. CoRHAN shares radio resources fairly and efficiently by integrating multiple networks together. CoRHAN‟s primary objective is to provide 1) Highly reliable communication whenever and wherever needed 2) Efficient utilization of the radio spectrum. Simulation and experimental analysis proves that CoRHAN improves the reliability of data transmission reducing the bit error rate and delay with optimized sensing time, maximizing spectrum utilization with minimum latency and guaranteed integrity. © Research India Publications. Source


Rajamanickam V.,Anna UniversityTamil Nadu | Marikkannan S.,Anna UniversityTamil Nadu | Rajavelu T.,Anna UniversityTamil Nadu
International Journal of Applied Engineering Research | Year: 2015

Due to the rapid growth of the multimedia service, the video compression becomes an essential process for reducing the required bandwidth for transmission and storage in many applications. In H.264 Video coding standard, Motion estimation is the very important part of video compression technique that provides improved bit rate reduction and coding efficiency when compared with the other existing standards such as H.261, H.262,H.263. Several algorithms have been developed for the process of motion estimation to improve better compression quality with less number of computational time. In this paper, a new hybrid algorithm for motion estimation process is been proposed which combines the two or more search patterns to reduce the motion estimation time and thereby reducing the number of search points. The simulation results shows that proposed motion estimation scheme achieves an reduction of motion estimation time when compared to existing algorithms. The proposed Motion estimation algorithm is developed and analyzed using MATLAB environment. © Research India Publications. Source

Discover hidden collaborations