In this paper, we consider a two-way multiple input multiple output (MIMO) Amplify-and-Forward (AF) relay system, where interference is observed at the relay node during the multiple access (MAC) phase. For such a scenario, two new joint source-relay precoding algorithms with interference suppression are proposed and their performance analyzed through simulation results. These linear minimum me...

In this paper, an Alamouti-coded decode-and-forward protocol with optimum relay selection for three-user one destination cooperative communications is investigated. Particularly, we design the new protocol that allows the source node retransmitting the signal to the destination node at the same time as the relay node forwarding the received signal to the destination node with an Alamouti coding...

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...

The Delay Constrained Relay Node Placement (DCRNP) problem in Wireless Sensor Networks (WSNs) aims to deploy minimum relay nodes such that for each sensor node there is a path connecting this sensor node to the sink without violating delay constraint. As WSNs are gradually employed in time-critical applications, the importance of the DCRNP problem becomes noticeable. For the NP-hard nature of D...

–Mobile network has a highest level of vulnerability since mobile networks are liable to attack due to its transparent location. The Adhoc nature posses structure less property due to its dynamic nature which paves way for multiple ways of attacks. Implementing IDS is a tedious process and one among them is Worm Hole attack which really challenges researchers to provide solution for preventing ...

This paper introduces broadcasting relay nodes for orthogonal multiuser channels. The underlying idea is that a single relay node is shared by multiple source-destination pairs. In this scheme, the relay node receives the messages of multiple independent sources, and broadcasts a single superimposed signal to multiple destinations. Compared to dedicated relay scenarios, large gains in capacity ...

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 investigate a relaying wireless sensor network (WSN) with the non-orthogonal multiple access (NOMA) and node selection schemes over Rayleigh fading. Precisely, system consists of two clusters, sink node, an amplify-and-forward (AF) relay. These sensors applying NOMA transmit sensing data from clusters via relay to sink. We derived expressions outage probability throughput for ...

In this paper, we propose link-adaptive cooperative communication in wireless USB networks. To select the optimal relay node, we propose the RNS (Relay Node Selection) algorithm considering channel condition. Also, the proposed protocol can be directly applied with small overhead to the current wireless USB standard system. Furthermore, each device independently performs RNS algorithm by using ...