L’etude realisee dans ce memoire porte sur la communication et la transmission des donnees dans le contexte des reseaux de capteurs. Pour ameliorer la fiabilite de transmission, des relais sont inseres entre les capteurs et la destination afin de pouvoir corriger les erreurs de transmissions en utilisant des codes LDPC. L’architecture est donc optimisee grâce aux codes en blocs mais aussi a l’aide des protocoles de detection d’erreurs et aussi a l’aide de la combinaison de la correction et de la detection d’erreurs. Les systemes d’antennes multiples forment egalement une option tres interessante pour l’amelioration des performances. L’efficacite energetique est etudiee dans les differents protocoles et solutions proposes. Une optimisation conjointe du codage de canal et du codage de reseau physique est egalement effectuee.

Cooperative Communications In Mobile Ad hoc NETworks

In this paper, we analyze the delay performance for a Markovian source transported over a wireless channel with time-varying error characteristics. To improve the reliability of the channel, the end points of the wireless link implement a selective-repeat (SR) ARQ error control protocol. We provide an approximate discrete-time analysis of the end-to-end mean packet delay, which consists of transport and resequencing delays. Numerical results and simulations indicate that our approximate analysis is sufficiently accurate for a wide range of parameter values.

Delay Analysis of Selective Repeat ARQ for a Markovian Source Over a Wireless Channel

Three low complexity, single-parameter, selection cooperation protocols, called P-n, P-gamma, and P-t, are introduced for dual-hop relaying networks. The protocols are based on information accumulation, and can potentially be implemented using rateless codes. The protocols have low complexity in terms of the relatively small number of signal-to-noise ratio (SNR) measurements, not requiring global channel gain information, not involving simultaneous multiple transmissions, and using a single design parameter. The expected transmission time for the three protocols is analyzed for block fading channels. As a baseline for performance comparison, a rate optimal protocol, called P-o, is proposed. In the single-relay case, all the protocols, if used with their optimized parameter, coincide with P-o. Large SNR approximations to the optimal parameters, which have good accuracy in large SNR regimes, and satisfactory accuracy for smaller values of SNR, are obtained. The dependence of the optimal parameters on the network parameters is numerically studied for Rayleigh fading. The average rate performances of the schemes are compared with other comparable previous relaying schemes through numerical examples. It is observed that the suboptimal schemes exhibit near-optimal rate performances.

Low Complexity Selection Cooperation Techniques Using Information Accumulation in Dual-Hop Relaying Networks

Machine to machine (M2M) communication is an emerging technology that enables heterogeneous devices to communicate with each other without human intervention and thus forming so-called Internet of Things (IoTs). Wireless cellular networks (WCNs) play a significant role in the successful deployment of M2M communication. Specially the ongoing massive deployment of long term evolution advanced (LTE-A) makes it possible to establish machine type communication (MTC) in most urban and remote areas, and by using LTE-A backhaul network, a seamless network communication is being established between MTC-devices and-applications. However, the extensive network coverage does not ensure a successful implementation of M2M communication in the LTE-A, and therefore there are still some challenges.

Energy efficient reliable transmission is perhaps the most compelling demand for various M2M applications. Among the factors affecting reliability of M2M communication are the high endto-end delay and high bit error rate. The objective of the thesis is to provide reliable M2M communication in LTE-A network. In this aim, to alleviate the signalling congestion on air interface and efficient data aggregation we consider a cluster based architecture where the MTC devices are grouped into number of clusters and traffics are forwarded through some special nodes called cluster heads (CHs) to the base station (BS) using single or multi-hop transmissions. In many deployment scenarios, some machines are allowed to move and change their location in the deployment area with very low mobility. In practice, the performance of data transmission often degrades with the increase of distance between neighboring CHs. CH needs to be reselected in such cases. However, frequent re-selection of CHs results in counter effect on routing and reconfiguration of resource allocation associated with CH-dependent protocols. In addition, the link quality between a CH-CH and CH-BS are very often affected by various dynamic environmental factors such as heat and humidity, obstacles and RF interferences. Since CH aggregates the traffic from all cluster members, failure of the CH means that the full cluster will fail. Many solutions have been proposed to combat with error prone wireless channel such as automatic repeat request (ARQ) and multipath routing. Though the above mentioned techniques improve the communication reliability but intervene the communication efficiency. In the former scheme, the transmitter retransmits the whole packet even though the part of the packet has been received correctly and in the later one, the receiver may receive the same information from multiple paths; thus both techniques are bandwidth and energy inefficient. In addition, with retransmission, overall end to end delay may exceed the maximum allowable delay budget.

Based on the aforementioned observations, we identify CH-to-CH channel is one of the bottlenecks to provide reliable communication in cluster based multihop M2M network and present a full solution to support fountain coded cooperative communications. Our solution covers many aspects from relay selection to cooperative formation to meet the user’s QoS requirements. In the first part of the thesis, we first design a rateless-coded-incremental-relay selection (RCIRS) algorithm based on greedy techniques to guarantee the required data rate with a minimum cost. After that, we develop fountain coded cooperative communication protocols to facilitate the data transmission between two neighbor CHs. In the second part, we propose joint network and fountain coding schemes for reliable communication. Through coupling channel coding and network coding simultaneously in the physical layer, joint network and fountain coding schemes efficiently exploit the redundancy of both codes and effectively combat the detrimental effect of fading conditions in wireless channels. In the proposed scheme, after correctly decoding the information from different sources, a relay node applies network and fountain coding on the received signals and then transmits to the destination in a single transmission. Therefore, the proposed schemes exploit the diversity and coding gain to improve the system performance. In the third part, we focus on the reliable uplink transmission between CHs and BS where CHs transmit to BS directly or with the help of the LTE-A relay nodes (RN). We investigate both type-I and type-II enhanced LTE-A networks and propose a set of joint network and fountain coding schemes to enhance the link robustness.

Finally, the proposed solutions are evaluated through extensive numerical simulations and the numerical results are presented to provide a comparison with the related works found in the literature.

Towards reliable communication in LTE-A connected heterogeneous machine to machine network

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Towards reliable communication in LTE-A connected heterogeneous machine to machine network