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By exploiting superimposed signals at relays, physicallayer network coding (PNC) could significantly improve the throughput of wireless communications systems. However, it is challenging to achieve perfect synchronization between superimposed signals at the relay. In this paper, we propose an approach to resolve the issue of frame-misalignment in PNC using type-I Euclidean geometry low-density parity-check...
In this paper, we consider a simple two-relay wireless sensor network with packet retransmission where transmission energy and network geometry can be adjusted to improve the energy efficiency of the whole network. We model the energy states of the system as a Markov chain. With both analytical and numerical methods, we investigate how total energy consumption per packet and system throughput are...
In this work we consider a relay assisted CDMA network with a large number of sources and half duplex relays and a unique destination. We propose two relaying protocols called direct relaying (DR) and full relaying (FR). By dividing the relays in groups and adopting different forwarding delays for each group both protocols introduce diversity which depends on the number of groups and on the protocol...
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