Cognitive Radio provides enhanced wireless communication performance through context-aware sensing and adaptation. Cooperative relay enhances network connection quality and improved system throughput. Applying cooperative relay communication technique on Cognitive Radio networks enables Cognitive Radio to opportunistically exploit cooperation between network nodes. This integrated design that b...

We consider a two-way relay network, where two source nodes, S1 and S2, exchange information through a cluster of relay nodes. The relay nodes receive the sum signal from S1 and S2 in the first time slot. In the second time slot, each relay node multiplies its received signal by a complex coefficient and retransmits the signal to the two source nodes, which leads to a distributed two-way beamfo...

In this article, we study the optimal structure of the source precoding matrix and the relay amplifying matrices for multiple-input multiple-output (MIMO) relay communication systems with parallel relay nodes. Two types of receivers are considered at the destination node: (1) The linear minimal mean-squared error (MMSE) receiver; (2) The nonlinear decision feedback equalizer based on the minima...

Wireless multi-hop relay networks have become very significant technologies in mobile communications. These networks ensure data rate transfer and coverage extension with a low cost. In this study two types of relay are studied; Fixed Relay Node (FRN) and Moving Relay Node (MRN). Where system analyses for uplink and downlink transmission are derived in this study. Moreover the optimal relay loc...

Mobile Wireless Sensor Networks (MWSNs) is one of the rising technologies for numerous areas of application, such as environmental monitoring, industrial sensing and diagnostics and battlefield awareness. Such wireless sensor nodes are often deployed in remote locations. Thus, energy efficient and reliable data forwarding is important because each node has limited resources. In this paper we pr...

In this paper, non-orthogonal multiple access (NOMA) in cooperative relay system is considered, where a source node communicates with pair of energy harvesting (EH) user equipments through antennas node. A hybrid protocol adopted at the relay, which if can successfully decode signals, decode-and-forward (DF) will be to forward signals users. Otherwise, amplify-and-forward (AF) implemented. Assu...

This paper checks the correctness of our novel algorithm for secure, reliable and flexible transmission of big data in two-hop wireless networks using cooperative jamming scheme of attacker location unknown through Markovian process. Big data has to transmit in two-hop from source-to-relay and relay-to-destination node by deploying security in physical layer. Based on our novel algorithm, the n...

In Cooperative Wireless Communication, system performance decreases due to the improper estimation of the channel. We analyzed MIMO-STBC based Decode and Forward (DF) Cooperation Communication System, considering the effect of error, arises due to the improper estimation of channel. We have considered Decode Forward (DF) based MIMO Space Time Block Code (STBC) Cooperative Communication Network ...