Anya Apavatjrut

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The recent advances in information theory and networking have significantly modified the way to disseminate data in wireless sensor networks (WSNs): aggregation, network coding or rateless codes. These new paradigms of dissemination create new threats for security such as pollution attacks. These attacks exploit the difficulty to protect data integrity in(More)
This paper tackles the problem of providing end to end reliable transmissions in a randomly deployed wireless sensor network. To this aim, we investigate the simultaneous use of gradient broadcast routing (for its inherent adaptability to any network topology and its changes), fountain codes (for their universal property) and intra-flow network coding (to(More)
Indoor WIFI localization is challenging especially when deployed over wireless device with limited system resource. Although GPS can give approximate position of the mobile users, it is usually limited indoor due to the degradation of signals by the building structures. While various alternative WIFI localization techniques have been proposed for indoor(More)
Diversity is a powerful means to increase the transmission performance of wireless communications. For the case of fountain codes relaying, it has been shown previously that introducing diversity is also beneficial since it counteracts transmission losses on the channel. Instead of simply hop-by-hop forwarding information, each sensor node diversifies the(More)
This paper concentrates on the proper use of fountain codes for the transmission of sporadic data in a wireless sensor network (WSN). Fountain codes offer great perspectives for the self-organization of WSNs: they self adapt to the channel error rate without control packets. Deploying fountain codes in a WSN raises two problems. First, the size of the data(More)
The gradient broadcast routing protocol is one of the most promising routing solution for a large scale wireless sensor network as it provides robust data delivery to error prone wireless channels. Occasionally, the broadcast nature of this protocol may incur high power consumption which is a critical issue of sensor nodes. In this paper, several energy(More)
One of the most powerful ways to achieve transmission reliability over wireless links is to employ efficient coding techniques. This paper investigates the performance of a transmission over a relay channel where information is protected by two layers of coding. In the first layer, transmission reliability is ensured by fountain coding at the source. The(More)