Joint Power optimization of Multiple Source-Destinations in Amplify and Forward Relay Networks with Direct Links

Joint sources and relay power optimization in relay network with multiple source-destination pairs, which simultaneously using the same relays for communications, when also every source has a direct links with all the destinations, is a practical and complicated problem. When every pair of SD pair need a required quality based on SINR, the current methods, are based on exhaustive search, which become impractical in situations like increasing the numbers of users, or are based on using approximations that become inexact in some conditions. In this situation, three modified methods are proposed, increasing the older methods performance. The new methods are based on exact power equations and based on computer simulations, we showed that in High SINR and low correlation channels, the benefits are low and about few percent, but by increasing the channel/code correlations, the gain become noticeable and become multiple dB.