A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Indumathi, G.
- Cross-Layer Design and Analysis with QoS Support in WimaxNetworks
Authors
1 Department of Information and Communication Engineering, Anna University, Chennai, IN
2 Maha Barathi Engineering College, Chinnasalem, Tamilnadu, IN
Source
Wireless Communication, Vol 1, No 3 (2009), Pagination: 164-169Abstract
A cross-layer design is developed which combines the Adaptive Modulation and Coding (AMC) at the physical layer and truncated Automatic Repeat Request (ARQ) at the data link layer to maximize the spectral efficiency under prescribed error performance constraints. Depending on the error correcting capability of the truncated ARQ, which depends on the maximum allowable number of retransmissions, we design AMC transmission modes, with each mode consisting of a specific modulation and FEC code pair as in IEEE 802.16 standard, that guarantee the required performance. Numerical results reveal that retransmissions at the data link layer relieve stringent error control requirements at the physical layer and thereby enable considerable spectral efficiency gain. This gain is provided by the maximum number of retransmissions per packet which equals the diversity order. The improvement on spectral efficiency decreases when the number of retransmissions increases, suggest that a small number of retransmissions offers a desirable delay-throughput tradeoff, in practice.
Keywords
Adaptive Modulation and Coding (AMC), Automatic Repeat Request (ARQ) Protocol, Cross-Layer Design, IEEE802.16, Quality of Service (QOS), Wireless Networks.- Design and Development of Health Monitoring System
Authors
1 Department of ECE, Cambridge Institute Of Technology, K R Puram, Bangalore-560036, IN
Source
International Journal of Engineering Research, Vol 5, No SP 5 (2016), Pagination: 1062-1064Abstract
It is expected that the Internet of Things (IOT) applications for medical services can be one of the most remarkable solution for taking care of aging population which is in the rapid growth. IOT consists of communications and sensors to accomplish purpose. In the diverse kinds of networks, wireless body area network (WBAN) is a highly suitable communication tool for the medical IOT devices. There are many researches about WBAN and sensor network, which are mainly focused on energy efficiency. However, in this paper, we discuss more practical issues for implementation of WBAN to healthcare service. Therefore, we propose a multi-hop WBAN construction scheme that is consists of operations such as the clustered topology setup and mobility support. As an auxiliary benefit, the proposed scheme achieves an energy efficient feature by reducing the number of total control messages. Extensive simulation shows that the proposed scheme remarkably improves the performance of WBAN [i].Keywords
WBAN, Sensor Network, Clustered Topology, Mobility Support.- NWR: Net Weighing Based Timing Driven Routing Algorithm
Authors
1 Cambridge Institute of Technology, Krishnarajapuram − 560036, Bangalore, Karnataka, IN