Performance Analysis of Adaptive Power Technique for Cooperative Diversity Communications

Abstract

Abstract-Cooperative diversity is a promising technique for use in wireless networks because it can provide diversity gain without the need to install multiple antennas at the source or destination. This paper is concerned with the performance analysis of a dual-hop random access network employed adaptive power technique (APT) relay in cooperative diversity networks. The network considered uses amplify-and-forward relaying, and is the only mean to connect source to its destination. This scheme is compared with such popular schemes as the orthogonal scheme, best relay selection, maximal ratio transmission (MRT) and the optimum combining scheme. A new unified mathematical method is developed, which leads to the derivation of new analytical expressions for the overall spectral-efficiency of the dual-hop random access network over Rayleigh fading channels. Numerical results show that the APT can benefit from an increase in the number of relays and reduction of the noise power at the relay and destination. The results also show that the performance of the APT is comparable to the other cooperative schemes, except the MRT. Furthermore, the new mathematical results obtained for APT have been confirmed by Monte Carlo simulation.

Performance Analysis of Cooperative Diversity in Multi-user Environments

“…This kind of cooperative technology has attracted the researchers' attention due to the dramatic performance gains that can be achieved in the case of the unavailability of the other types of diversity and when users share antennas and other resources to exchange channel information and transmitted symbols [1]. Transmission in wireless communication is mostly affected by shadowing, fading and distance between the source and the end-users, particularly when the communication is taking place between multiple-source nodes and multiple-destinations.…”