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Energy harvesting is a promising solution to prolong the lifetime of energy-constrained wireless sensor networks. In particular, scavenging energy from ambient radio frequency (RF) signals has drawn a lot of attention recently. In this paper, we apply simultaneous wireless information and power transfer (SWIPT) to a clustered sensor network such that a cluster head node harvests the wireless energy...
Energy consumption in sensor nodes and Link reliability are two of the major challenges in Wireless Sensor Networks (WSNs). The data exchanged between nodes and base station are vulnerable to corruption by errors induced by random noise, signal fading and other factors. In this regard, error control coding (ECC) is an efficient technique used to increase link reliability and to reduce the required...
Wireless Sensor Networks (WSNs) are increasingly deployed in office blocks, residential areas and also industrial locations, thanks to advantages in terms of flexibility and scalability. Nowadays available wireless fieldbuses are widely adopted for process monitoring and offer performance comparable with the wired counterparts, despite they still are more sensitive to interference from external sources...
Network coding is a communication paradigm that allows intermediate nodes to mix packets instead of simply relaying them. Motivated by applications in military tactical networks, this paper explores the use of the network coding. It has been proved that network coding has many benefits in wireless communications such as optimal capacity achievement and packet loss recovery. In this paper, we present...
This paper analyzes the block error rate (BLER) performance provided by a virtual MIMO scheme which implements a modified Alamouti Space-Frequency Block Code (SFBC) encoding-decoding algorithm using two fixed Decode &Forward relays that perform selective relaying, and single-antenna devices. It also analyzes the performance of the classical relay-based distributed Alamouti scheme with single-antenna...
In this paper, a novel video error concealment technique is presented. More specifically, for IP-based in-vehicle wireless networks, a robust video error concealment technique is proposed based on residual errors and boundary matching approach. Residual errors are used for checking reliability of motion vectors of coding units and a boundary matching algorithm is used for maintaining smoothness in...
Power consumption is the critical design goal for Wireless Sensor Networks (WSNs) that comprise large number of sensors which operate with limited power resources such as small batteries. Sensors usually follow various MAC protocols which allow accessing to wireless communication channels. However, sensors may access to wireless channels at the same time, potentially, leading to collisions among multiple...
In this work, our focus is on study and analysis of various IO standards at different temperatures. Virtex-6 is 40-nm FPGA and Kintex7 is 28-nm FPGA on which we implement our circuit to re-assure power reduction in sequential circuit. We have calculated power dissipation of different IO standards and analysed its power. The percentage of reduction in power dissipation for 28-nm FPGA is 65.56% with...
Network Coding has attracted significant attention in recent years, and it has been widely applied in broadcast, multicast and unicast. Nevertheless, the study on network coding in convergecast is still in the theoretical analysis and the simulation stage. In order to investigate the network coding gain of convergecast in realistic wireless sensor networks, a network coding-based convergecast scheme...
Since data are originated and processed by multiple agents in wireless sensor networks, data provenance plays an important role for assuring data trustworthiness. However, the size of the provenance tends to increase at a higher rate as it is transmitted from the source to the base station and is processed by many intermediate nodes. Due to bandwidth and energy limitations of wireless sensor networks,...
The quality of wireless video delivery is susceptible to wireless channel instability, including channel fading, interference, noise, and packet loss. To improve the video quality in such wireless channels, analog transmission schemes have been proposed recently. However, the existing analog schemes have two drawbacks in high energy of video signals and loss resilience. To overcome the issues, we...
In this paper we study the problem of designing a distributed data storage system using rateless codes for resource constrained systems such as Wireless Sensor Networks (WSNs). Rateless codes, e.g. LT-codes, can achieve reduced complexity of both encoding and decoding, which caters well to the nature of limited resources in such systems. However, data in WSNs is inherently decentralized and that poses...
Reed-Solomon convolutional concatenated (RSCC) codes have been widely used in wireless and space communications. Turbo decoding of the concatenated code has been recently developed and shown that the code's error-correction capability can be significantly improved. Particularly, turbo decoding of RSCC codes yields a competent performance when the codeword length is limited. This makes the code a very...
Wireless sensor networks (WSN) typically rely on application-specific tree-based communication topologies between source and sink nodes to transmit application specific messages. In this paper, the OCSSIM communication scheme is proposed to realize multicast communication for multiple applications with coinciding transmissions between any number of source and sink nodes. With often changing sink and...
This paper has explored the energy efficiency of Raptor codes; a first known class of fountain codes in an energy constrained network. Transmission power is adjusted dynamically to overcome unreliability over lossy links in wireless sensor network. One of the most felicitous key for this reliability issue is using Forward Error Correction (FEC) codes. This paper investigates the energy bagged by one...
Greendicator is an indicator system that enables wireless embedded sensing systems to output data encoded as LED pulses to be decoded and viewed on smart phones. The transmitter encodes the message to be displayed in the form of modulated light pulses emitted with an existing visible-light LED or other light-emitting devices such as IR, laser diode, or light reflector. The receiver uses a camera-equipped...
In this paper, we employ distributed jointed source-channel (DJSC) coding based on quasi-cyclic low-density parity-check (QC-LDPC) codes in our wireless sensor network (WSN) for seismic exploration. In order to reduce the latency of jointed decoding, we propose a parallel structure of jointed decoding, and decoders of multiple sources can decode simultaneously. We make use of the soft information...
Low-density generator matrix (LDGM) codes can be generated through instantaneous network topology with XOR operation at each node in original adaptive network coded cooperation (ANCC). Regular LDGM codes exhibit tradeoff nature between error floor and convergence threshold due to the low weight columns in the resulting parity check matrix. In this paper, we propose a scheme called serially-concatenated...
Reliability has become one of the most vital requirements in wireless sensor networks (WSNs). One efficient way to increase the reliability is by using erasure coding techniques such as Reed-Solomon/Cauchy Reed-Solomon. The problem is the time required for encoding and decoding the data words, especially when large amount of data need to be sent like in complex WSN applications. In this paper, we...
Distributed video coding (DVC) is a potential solution for distributed video sensors in wireless visual sensor and machine-to-machine (M2M) networks. However, the error resilience schemes have not been fully investigated in literatures. In this paper, we propose several error resilience schemes for key frame transmission of DVC, including resending, refining, and hybrid modes. The resending mode asks...
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