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Wireless Smart Home Sensor Network (WSHSN) is a home-similar environment, where several wireless sensors can observe the home status and transmit the data streams to the Smart Home Information System (SHIS). Communication in Wireless Sensor Network (WSN) in small living environments faces noise and data transmission speed problems. Especially in the case of employing mobile agents, the WSN restructures...
In an unreliable cluster-based, broadcast-oriented vehicular network setting, we investigate the transmission reliability and throughput performance of random network coding (RNC) as a function of the packet generate rate. Our proposed model consists of a source vehicle broadcasting packets to a set of receivers (i.e. one-to-many) over independent broadcast erasure channels. The source vehicle performs...
Applying network coding (NC) into the protocol stack has been studied with much attention in order to improve Transmission Control Protocol (TCP) goodput in inherently lossy networks (e.g., wireless networks in unstable environments). TCP with network coding (TCP/NC) is expected to recover the lost packets without retransmission at the sink by sending the redundant combination packets which are encoded...
In this paper, we propose two novel physical layer aware adaptive network coding schemes for time variant channels, one aiming to maximize the energy efficiency, the other exploiting also the variable modulation order, in an adaptive way. The proposed schemes have been applied to different satellite communications scenarios with different Round Trip Times (RTT). Compared to adaptive network coding,...
Network coding can significantly enhance throughput and reliability in loss prone wireless networks. Adapting network coding redundancy is critical, since over-redundancy wastes network resources and hurts performance and under-estimated redundancy prevents decoding at destination. In this paper, we study the tradeoff between application tolerated loss rate and network overhead introduced by network...
In this paper, we propose a selective physical layer network coding (SPNC) scheme in two-way relay channel (TWRC) for binary phase shift keying (BPSK) modulation over Rayleigh fading channels. Physical layer network coding (PNC) shows average throughput gain over traditional relaying in two-way relay systems, but not in all channel conditions PNC performs better than traditional relaying. The key...
Cooperative communication system is not able fully to solve the problems all about multipath fading, there are many parameters to decrease signal level to the receiver. The author brings the solution to embedded with network coding, this paper focus to enhance research about cooperative with network coding (CNC), using transparent protocol i.e amplify-and-forward (AF) with BPSK and QPSK modulation...
Linear network coding (LNC) has great advantages in optimizing throughput, balancing network load, increasing robustness, etc. Since the coded data packets transmitted in the network are linear combinations of original data packets, the attacker cannot decode to obtain the original data when it cannot acquire enough coded data packets. Therefore, LNC can also provide efficient information security...
The issue of energy efficiency for processing multirate signal for wireless sensor network with the aim of increasing channel capacity and delay improvement is addressed. Different types of coding and modulation techniques are used to choose devices from different transmission rates. In a multichannel network the selection of link rate is difficult. In this paper we tried to focus on solution of link...
Traditional routing mode is just responsible for receiving and forwarding data packets. The proposing of network coding offers a new research direction for the development of wireless sensor networks(WSN) [1]. Preliminary theoretical studies and experiments have shown the advantages of network coding which can improve throughput and reduce energy consumption in WSN [2,3]. By linear coding operation,...
Asymmetric data transmission is a challenge factor in wireless communication channel. In this paper, we study the issue of data processing in asymmetric data transmission from different sources in wireless communication channel, and propose a Joint Hierarchical Modulation and Network Coding (JHMNC) scheme. In the proposed scheme, the procedure of JHMNC is analyzed and compared with the traditional...
In this paper, we consider a time-division multiple-access relay channel (MARC), in which two source nodes (SNs) transmit data with different data rate to a destination node (DN) with the help of a relay node (RN). To provide asymmetric data rates, we consider joint hierarchical 16QAM (HM 16QAM) and network coding. Simulations results show that the joint HM 16QAM and network coding has similar throughput...
Wireless Body Area Network (WBAN) has been considered as a revolutionary technology to address current healthcare needs. However, before the extensive deployment of WBAN, one main challenge to be met is how to balance the trade-off between data transmission rate and energy efficiency. In this paper, we utilize WBAN's spatial correlation characteristics during movement and propose an efficient cross-layer...
While feasibility and obtaining a solution of a given network coding problem are well studied, the decoding procedure and complexity have not garnered much attention. We consider the decoding problem in a network wherein the sources generate multiple messages and the sink nodes demand some or all of the source messages. We consider both linear and non-linear network codes over a finite field and propose...
Network coding offers a promising platform for multicast transmission to improve the throughput. However, the users may not collect a full set of the encoded packets to recover the useful information because of its block processing property, leading to the low throughput under wireless fading channel. While the schemes that using feedback from all the receivers to cover the problem above always causes...
Random Linear Network coding (RLNC) has emerged as a promising solution for reliable multimedia delivery over mobile cellular networks. In this paper, we deploy Application Layer-RLNC (AL-RLNC) on the top of the existing Hybrid Automatic Repeat Request (HARQ) in 4G Long Term Evolution (LTE) networks. A simple implementation scenario composed of a user equipment, an eNB and a remote host is considered...
In this paper, we propose a novel detection algorithm for random multiple access, which combines slot based decoding and frame based decoding to recover users' messages. For the slot based decoding, we exploit a linear physical-layer network coding (LPNC) algorithm to decode the linear combinations of collided packets at each slot. By designing the coefficient matrix of linear combinations, we have...
Random network coding (RNC) is an efficient coding scheme at the network layer to improve the performance of the wireless multicast networks. However, the full set of encoded packets may not be collected to correctly decode the original information in wireless fading channels, leading to the low network throughput. This issue will be more severe in multimedia transmission. On the other hand, cooperative...
Network coding improves transmission efficiency by combining packets at relay nodes and thus reduces the number of packets sent to the network. It is a network layer solution to improve network throughput and transmission efficiency. However, a coded packet must be decodable by the destination, otherwise it is a waste of resource to combine them together and to deliver the coded packet. This paper...
Network Coding is a packet encoding technique which has recently been shown to improve network performance (by reducing delays and increasing throughput) in broadcast and multicast communications. The cost for such an improvement comes in the form of increased decoding complexity (and thus delay) at the receivers end. Before delivering the file to higher layers, the receiver should first decode those...
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