A new relaying scheme for cheap wireless relay nodes

In this paper we will propose a relaying scheme for wireless multi-hop networks. It is based on collaboration of intermediate relays at network layer to forward useful side information in place of dumbly forwarding packets. In our scheme we assume that the nodes are not able to benefit from any interference cancellation mechanism. The channels from sender to relay nodes and from sender to receiver are logically separated through a temporal scheduling. This model is realistic for many practical scenarios in the context of wireless networks. We will show in this paper the information theoretic bounds and show that they are achievable using practical codes. The proposed coding scheme is simulated in realistic scenarios. The obtained results show a remarkable improvement in throughput, relay load and reliability compared to network using classical routing approach

On the capacity of erasure relay channel: Multi-relay case

We consider here a single sender-destination multirelay channel. The links connecting the nodes are supposed to be erasure where symbols are received correctly without any error, or lost. We consider that the nodes are not able to use any interference cancellation mechanism. The interference might be suppressed through using separated physical channel or thought a time-sharing mechanism. This model is realistic for many practical scenarios in the context of wireless networks. In previous works, the capacity region of broadcast erasure channels as well as the capacity of the single-sender relay channel (under degraded and non-degraded hypothesis) has been derived. This paper extends the previous results to the more general case of multi-relay channels. We derive the cut-set bound for a general (stationary ergodic) multi-relay erasure channel, and we show that it can be reached through a practical linear coding scheme based on MDS codes

A new relaying scheme for cheap wireless relay nodes

International audienceWireless networks consist of senders, receivers, and intermediate nodes collaborating (more or less) to establish the communication paths. Most of the researches in the domain of wireless network have focused on routing based approaches. In such an approach, wireless network is reduced to a dynamic graph, and a minimum cost routing mechanism is applied. These approaches have led to several routing mechanisms as OLSR and AODV. However, the fundamental nature of wireless network is the broadcast. In the wireless network, all the tuned receivers potentially receive every transmission. This basic property is not well captured by graph-based approaches where packets follow a single path from sender to receiver. In this paper we propose a relaying scheme for wireless multi-hop networks. It is based on collaboration of intermediate relays at network layer to forward useful side information in place of forwarding packets. In our scheme we assume that the nodes are not able to benefit from any interference cancellation mechanism. The channels from sender to relay nodes and from sender to receiver are logically separated through a temporal scheduling. This model is realistic for many practical scenarios in the context of wireless networks. We show in this paper the information theoretic bounds and show that they are achievable using practical codes. The proposed coding scheme is simulated in realistic scenarios. The obtained results show a remarkable improvement in throughput, relay load and reliability compared to network using classical routing approach