Outage Probability of Cognitive Relay Networks Over Generalized Fading Channels with Interference Constraints

AbstractIn this paper, we evaluate the outage probability (OP) of a cognitive relay network operating over generalized fading channels, modeled by the generalized-K and generalized-gamma distributions. In particular, secondary users, based on the underlay approach, cooperate employing decode-and-forward protocol, satisfying in any case an interference constraint on the primary destination users. The derived results include exact expressions as well as approximated ones for high values of the maximum allowed transmitted power. Numerical evaluated results show that the OP of cognitive relay networks is highly related with the fading/shadowing channel conditions as well as interfering constraints, with the latter resulting in higher OP compared to the conventional relaying systems

Operationalising Ecologically Sustainable Development at the Micro Level Pareto Optimality and the Preservation of Biologically Crucial Levels.

The concept of Ecologically Sustainable Economic Development (ESED) has led to relentlessly heated debate. Yet, it still remains without a clear operational framework. At the micro level where a multitude of projects and programmes are designed, the absence of operational principles has serious repercussions. In order to tackle this ineffectiveness, ESED may be viewed as a pattern of economic process and evolution that takes into account the constraints imposed by the natural environment. In effect, the economic process should ensure the preservation of the human race by maintaining the biological basis responsible for the healthy evolution of the race. In addition, economic development should not lead to Pareto suboptimal positions by precluding production potentials. Based on these principles, the present paper outlines an operational framework for ESED at the micro level of projects and programmes. Copyright © 2006 Inderscience Enterprises Ltd