In this paper a relay selection scheme for amplify and forward relaying is proposed to select one relay from multi-relay networks. The selected relay by the proposed algorithm cooperates only if the signal to noise ratio (SNR) of the source-relay-destination link is greater than the SNR of the source-destination link. A theoretical bit error rate performance of the proposed scheme is derived. C...

In this paper, we present performance analysis for underlay cognitive decode-and-forward relay networks with the N th best relay selection scheme over Nakagami-m fading channels. Both the maximum tolerated interference power constraint and the maximum transmit power limit are considered. Specifically, exact and asymptotic closed-form expressions are derived for the outage probability of the sec...

Author considered a wireless sensor network (WSN) with identically distributed nodes, and a two phase cooperative protocol where the source transmits and is overheard by multiple relays which in turn transmit to the destination or fusion center (FC). The Author introduces a selection scheme that will pick a subset of the relays that overhear the message and transmit to the FC. This scheme will ...

Author considered a wireless sensor network (WSN) with identically distributed nodes, and a two phase cooperative protocol where the source transmits and is overheard by multiple relays which in turn transmit to the destination or fusion center (FC). The Author introduces a selection scheme that will pick a subset of the relays that overhear the message and transmit to the FC. This scheme will ...

In this paper, we study the physical layer security (PLS) of opportunistic scheduling for uplink scenarios of multiuser multirelay cooperative networks. To this end, we propose a low-complexity, yet comparable secrecy performance source relay selection scheme, called the proposed source relay selection (PSRS) scheme. Specifically, the PSRS scheme first selects the least vulnerable source and th...

Network deployment problem is one of the major issues when base stations and relay stations are jointly deployed. Deploying relay station at suitable position covers throughput enhancement and coverage extension problem in IEEE 802.16j MMR networks. In this paper we have proposed a new adaptive model for throughput enhancement and optimal relay selection in IEEE 802.16j MMR networks and studied...

Cooperative diversity uses relays which assist source destination transmissions to reduce link outage rates in multipath fading environments. In this paper, an Amplify-and-Forward (AAF) cooperative communication system over Nakagami-m fading channel is considered where a source node communicates with a destination node directly and indirectly (through multiple relays). Nakagami-m fading channel...

We study the diversity multiplexing tradeoff in cooperative diversity systems involving multiple relays. We show that distributed space time codes are not always fundamentally necessary in realizing the potential gains in these systems. In particular, under a wide variety of scenarios, we show that a smart relay selection algorithm in conjunction with conventional protocols for the three node s...

Abstract—This work considers secure transmission protocol for flexible load-balance control in two-hop relay wireless networks without the information of both eavesdropper channels and locations. The available secure transmission protocols via relay cooperation in physical layer secrecy framework cannot provide a flexible load-balance control, which may significantly limit their application sco...