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Energy saving is the one of the most critical issues in wireless sensor networks (WSNs) due to limited battery power of sensor nodes. In this paper, we propose a channel-aware type-based multiple access (TBMA) scheme for longer lifetime of WSNs. In an effort to minimize data transmission which is the most energy consuming operation in a sensor device, the proposed scheme allows a subset of sensors...
Low cost and low power Wireless Sensor Networks (WSN) with transmit-only nodes are attracting more attention due to their advantages in achieving a good balance of cost, fine-grained sensing and differentiated service for data collection applications. This work addresses the reliability and performance issues of a single-hop hybrid WSN with both transmit-only nodes and standard nodes and proposes...
Although current research focused on sensor deployment to balance the energy consumption among the sensor nodes for prolonging the lifetime of wireless sensor networks, sensor nodes with larger communication radius have to consume more energy to overcome wireless channel fading and path loss. Cooperative transmission allows nodes with single-antenna to cooperate on information transmission and/or...
This paper considers minimum-energy routing problem in Poisson random ad-hoc networks with Nakagami-m fading channels. We first formulate an analytical model for the transmission power, subject to a certain packet reception probability, under the assumption that the users employ proper power control and slotted ALOHA protocol. Based on this, we consider five routing strategies and compare their energy...
During the last decade, many works were devoted to improving the performance of relaying techniques in ad hoc networks. One promising approach consists in allowing the relay nodes to cooperate, thus using spatial diversity to increase the capacity of the system. However, this approach introduces an overhead in terms of information exchange, increasing the complexity of the receivers. A simpler way...
Cooperative transmission using space time codes can be used to reduce transmission energy consumption for long range communication in wireless sensor networks (WSN). However, differing from traditional (multi-input-multi-output) MIMO systems, distributed cooperative communication systems in WSN usually lack of perfect synchronization. For the cooperative systems using Alamouti code, the effect of...
Most of the existing MAC-layer protocols for sensor networks consider the status of wireless channel as time invariant. This assumption leads to reduced energy efficiency due to repeated transmissions particularly in nodes that experience deep channel fading. Multiple factors can be responsible for fading channels including other wireless activity in the surroundings, mobility, and geographic landscape...
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