Zsolt Alfred Polgar

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The paper proposes a preliminary design of cross-layer quality of service applied to congestion control in future Internet. This is an alternative solution to QoS-aware routing, whenever the infrastructure operator cannot add new resources, and/or when re-routing is not possible. Dedicated software, running in each node, collects a list of local parameters(More)
The paper analyzes the performances provided by two algorithms that combine the network and distributed channel coding in cooperative schemes with a relay-node serving two mobile stations, placed symmetrically and asymmetrically vs. the base-station. The analysis is performed in scenarios that consider error-affected mobile – relay node channels. It also(More)
The optimization of networks which implement Network Coding techniques is necessary for efficient resource utilization. If the data is encoded only in a subset of nodes, selected in the appropriate way, the complexity of the coding operations could be decreased, while ensuring the imposed performances. Finding the minimum number of encoding nodes is a(More)
One of the most appropriate techniques to increase the reliability of wireless sensor networks used in industrial environments are the network coding techniques. This paper proposes an effective, yet simple and scalable approach based on a relay-assisted cooperative scheme that uses Reed Solomon codes as network codes for such wireless sensor networks with(More)
This paper presents a protocol designed as an alternative to classical TCP for channels which experience high loss-rates. The protocol is simplified with respect to TCP by eliminating the need of retransmissions and the associated buffers. This is achieved by applying a rateless erasure correcting code to the data that is going to be transferred. A modified(More)
The paper proposes a network coded cooperation protocol for the uplink transmission of relay assisted cellular networks characterized by non-ideal source – relay links. The proposed protocol employs Reed Solomon codes as network codes in order to improve the Block Error Rate (BLER) and Bit Error Rate (BER) performance over the slow varying fading channels.(More)
This paper proposes a network coded cooperation protocol for the uplink transmission of relay enhanced cellular networks, which is intended to multiple source-multiple relay cooperative clusters. Two variants of the network coded protocol are proposed, one employing XOR-based erasure codes, which operates on the cluster cooperation graph, and one employing(More)
This paper presents a possible application of the cross-layer QoS mechanism for network coding in Future Internet. The idea is that the congestion control could be solved for core networks if a network coding-based point-to-multipoint transmission is implemented with quality of service information collected in a bottom-up approach. The implemented testbed(More)