Broadcasting nature of wireless communications makes it possible to apply opportunistic network coding (OPNC) by overhearing transmitted packets from a source to sink nodes. However, it is difficult to apply network coding to the topology of multiple relay and sink nodes. We propose to use relay node selection, which finds a proper node for network coding since the OPNC alone in the topology of...

In this work, we analyze the performance of fullduplex relay selection (FDRS) in spectrum-sharing networks. Contrary to half-duplex relaying, full-duplex relaying (FDR) enables simultaneous listening/forwarding at the secondary relay(s), thereby allowing for a higher spectral efficiency. However, since the source and relay simultaneously transmit in FDR, their superimposed signal at the primary...

In cooperative communication in wireless networks, selection of best relay node is an important task. And provide secure transmission is also a challenging work. Our proposed protocol provides a new approach for relay selection and secure transmission in cooperative network for wireless network. Secure and efficient relays are selected on the basis of RPI table that maintain RPI points which is...

In this paper, we propose an improved relay selection scheme for single-relay decode-and-forward cooperative diversity systems, in which relays are selected according to instantaneous channel state information and a cooperative threshold is set up to eliminate some unsatisfying relays from the set of alternative relays and thus reduce the calculated amount. Simulation results show that the prop...

In this paper we propose two throughput-oriented relay selection rules for multi-hop relay networks. Our rules can achieve higher throughput while maintaining reliability. We also adopt the total relay transmit power constraint to utilize transmit power more efficiently.

Relay selection is an effective method to realize the cooperative diversity gain in wireless networks. In this paper, we study a threshold-based single relay selection algorithm. A reasonable threshold value is set at each relay node, and the first relay with the instantaneous channel gain larger than the threshold will be selected to cooperate with the source. The exact and closed form express...

Cooperative diversity is becoming an important means for improving link quality in relay based system. Relay selection plays a vital role in system performance. This paper investigates, the relay selection algorithm and location effect of supporting relay, on system performance. Multi-antenna can be deployed at the access point but maximum benefit is derived only under rich scattering. However,...

Recently, relay agents selection schemes were introduced to support downlink multicasting in WiMAX single frequency networks. Such schemes were devised to work cooperatively in order to facilitate reliable Multicast Broadcast Multimedia Services (MBMS) traffic delivery over wireless channels without any consideration to mobile relay agents’ battery energy levels. In this paper, we introduce a b...