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We propose a physical layer approach to detect the relay node that injects false data or adds channel errors into the network encoder in multiple access relay networks. The misbehaving relay is detected by using the maximum a posteriori (MAP) detection rule which is optimal in the sense of minimizing the probability of incorrect decision (false alarm and miss detection). The proposed scheme does not...
This paper investigates the diversity performance of wireless cooperative networks with multiple parallel relays communicating with the destination over orthogonal channels, and focuses on the amplify-and-forward relaying protocol. The networks under consideration employ two signal-to-noise ratio (SNR) thresholds and multiple hard-decision detections (HDDs) at the destination. One SNR threshold is...
In multi-input-multi-output relay systems with amplify-and-forward protocols, the source-relay and the relay-destination links can be treated as two groups of spatial channels. In this letter, an adaptive spatial channel mapping matrix is presented to be used between the two groups. A unified framework of the spatial channel mapping matrix design is presented, which includes various relay protocols...
A new optimization criterion is proposed to minimize error probability for the proposed joint optimal power allocation (PA) of the MIMO systems enhanced by relay in this paper. It is proved that the cost function obtained is only convex with respect to (w.r.t.) the power parameters of the source or those of the relay separately, but not convex w.r.t. the whole parameters. In order to use convex optimization...
We describe an approach to improving network performance in networks with heterogeneous links - for example, a communications network constructed from satellite links, airborne relays, and line-of-site radios - using disruption tolerant networking. DTN defines an overlay network that uses storage at each hop to make end-to-end communications resilient to delay, loss, network disruption, temporary...
Reliability of radio link is limited due to path loss, shadowing and multi-path fading, thereby necessitating the use of some type of diversity. Cooperative relaying has gained considerable attention in recent years. Relays cooperates in such a way that they share their antennas and other resources to create a virtual array through distributed transmission and signal processing. Energy issue for such...
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