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Cross Layered MAC Design for RF Energy Harvesting Sensor Network
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作者 Thangavelu Sasikala Veerasamy Jawahar Senthil Kumar 《Circuits and Systems》 2016年第9期2676-2688,共13页
The main research objective in wireless sensor networks (WSN) domain is to develop algorithms and protocols to ensure minimal energy consumption with maximum network lifetime. In this paper, we propose a novel design ... The main research objective in wireless sensor networks (WSN) domain is to develop algorithms and protocols to ensure minimal energy consumption with maximum network lifetime. In this paper, we propose a novel design for energy harvesting sensor node and cross-layered MAC protocol using three adjacent layers (Physical, MAC and Network) to economize energy for WSN. The basic idea behind our protocol is to re-energize the neighboring nodes using the radio frequency (RF) energy transmitted by the active nodes. This can be achieved by designing new energy harvesting sensor node and redesigning the MAC protocol. The results show that the proposed cross layer CL_EHSN improves the life time of the WSN by 40%. 展开更多
关键词 Wireless Sensor Network cross Layer design RF Energy Harvesting Lifetime Enhancement
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Proposal for a cross layer scheme for real-time wireless video
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作者 JEYARAJ Arulsaravana CHENG Liang EL ZARKI Magda 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2006年第10期1690-1694,共5页
This paper focuses on the design of the cross layer between the video application layer and the MIMO physical layer. MIMO physical layer research has promised an enormous increase in the capacity of wireless communica... This paper focuses on the design of the cross layer between the video application layer and the MIMO physical layer. MIMO physical layer research has promised an enormous increase in the capacity of wireless communication systems. Also MIMO wireless systems operate under fading conditions where the channel faces arbitrary fluctuations. Since the wireless channel changes over each coherence period, the capacity of the wireless channel, given the power constraints, changes. Hence to make efficient use of the available capacity one needs to adapt the video bit rate. However it is impossible to adapt at the application layer as changing the parameters of the video takes more time than the coherence period of the channel. In this paper we address this problem through a novel solution and also investigate its performance through a simulation study. 展开更多
关键词 MIMO V-BLAST Adaptive modulation Diversity Constant bit rate (CBR) cross layer design Power control Fine granular scalability (FGS)
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Energy Efficient and QoS Aware Framework for Video Transmission over Wireless Sensor Networks
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作者 Mohammed Ezz El Dien Aliaa A. A. Youssif Atef Zaki Ghalwash 《Wireless Sensor Network》 2016年第3期25-36,共12页
Wireless Multimedia Sensor Networks (WMSNs), is a network of sensors, which are limited in terms of memory, computing, bandwidth, and battery lifetime. Multimedia transmission over WSN requires certain QoS guarantees ... Wireless Multimedia Sensor Networks (WMSNs), is a network of sensors, which are limited in terms of memory, computing, bandwidth, and battery lifetime. Multimedia transmission over WSN requires certain QoS guarantees such as huge amount of bandwidth, strict delay and lower loss ratio that makes transmitting multimedia is a complicated task. However, adopting cross-layer approach in WMSNs improves quality of service of WSN under different environmental conditions. In this work, an energy efficient and QoS aware framework for transmitting multimedia content over WSN (EQWSN) is presented, where packet, queue and path scheduling were introduced. It adapts the application layer parameter of video encoder to current wireless channel state, and drops less important packets in case of network congestion according to packet type. Finally, the path scheduling differentiates packets types/priority and route them through different paths with different QoS considering network lifetime. Simulation results show that the new scheme EQWSN transmits video quality with QoS guarantees in addition to prolonging network lifetime. 展开更多
关键词 Wireless Multimedia Sensor Networks cross Layer design GOP Structure Analysis Packet Scheduling Queue Scheduling Path Scheduling
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Optimal Scheduling Method in MIMO WLAN with Distributed Coordination Function 被引量:1
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作者 饶毓 陈盛博 +1 位作者 陈巍 刘序明 《Tsinghua Science and Technology》 SCIE EI CAS 2010年第2期246-250,共5页
This paper addresses the optimal number of simultaneous data transmissions that maximize the system throughput in an MIMO WLAN. To facilitate simultaneous packet transmissions, both transceivers have to exchange pream... This paper addresses the optimal number of simultaneous data transmissions that maximize the system throughput in an MIMO WLAN. To facilitate simultaneous packet transmissions, both transceivers have to exchange preambles to calculate the channel state information. This exchange is combined with the RTS (request to send)/CTS (clear to send) handshake which is used to contend for the channel in WLANs. This study presents an expression for the optimal number of simultaneous data transmissions under the distributed coordinate function mechanism derived using the Markov chain model, as well as an analytical formula for the optimal system throughput given the length of the contention window and the number of nodes in the network. The analytical results show that the system throughput cannot be enhanced by simply increasing the numoer of simultaneous data transmissions. 展开更多
关键词 multiple input multiple output (MIMO) distributed coordination function (DCF) media access control (MAC) cross layer design protocol optimization
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