Abstract: The analysis the outage performance of suggested Cognitive Wireless Relay Network (CWRN) which consists of a source, a destination and M cognitive relay nodes and M primary user nodes. In this study, we mainly study that the cognitive relay nodes impact on the outage performance of proposed CWRN over Rayleigh channels under both the peak and average interference power constraints. Fir...

This paper proposes single antenna relay system using Denoise and forward (DNF) scheme for MIMO transmission. In this scheme, the relay node eliminates the noise by identifying constellation, and retransmits after amplification. DNF does not amplify the noise, and the channel information is unnecessary in the transmitting side. In this paper, we propose the de-noising scheme for MIMO applicatio...

Due to the necessity of saving energy cost in low-powered devices, extending the lifetime of a sensor node powered by battery in both homogeneous and heterogeneous wireless sensor networks (WSNs) is area of interest. To save battery power in sensor networks, many research works including low energy adaptive clustering hierarchy (LEACH) and its variants use clustering techniques to reduce energy...

In Wireless Sensor Networks large number of nodes and limited energy available per node calls for designing efficient transmission protocols. Cooperative transmission is one of the protocols which helps wireless nodes to achieve spatial diversity, which translates into reduction in transmission power or increase in coverage area. Cooperative protocol can be realized with or without (called conv...

Cooperative communication systems, which make use of the intermediate relays between transmitter and receiver, have been employed as an effective technique to combat channel fading enhance system performance. systems some drawbacks such high latency may diversity order not guaranteed. To alleviate negative effects these factors, relay selection protocol is in cooperative increase overall Relay ...

In this paper we adapt and evaluate the performance of two classical pilotaided channel estimation schemes designed for OFDM systems: least square and minimum mean square error, in a relay-assisted scenario. We consider the Amplifyand-Forward, which is the simplest relay protocol for cooperative systems. Also, we consider the use of a single antenna at all the terminals: base station, user term...

In this paper, we investigate achievable rates for data transmission from sources to sinks through multiple relay networks. We consider myopic coding, a constrained communication strategy in which each node has only a local view of the network, meaning that nodes can only transmit to and decode from neighboring nodes. We compare this with omniscient coding, in which every node has a global view...