Sum-Power Minimization in Multiuser Single-DF-Relay Networks with Direct Links

Abstract

Forming cooperation through relay's assistance is a promising method to realize green communication by reducing transmission power. In this paper, for multiuser single-DF-relay wireless networks with direct links, the optimal power allocation strategy that minimizes system-sum-power consumption is investigated. Based on the principle that minimizing system-sum-power consumption is equivalent to maximizing system energy efficiency, users are classified into two parts after comparing the channel gains between source-destination link and relay-destination link. The optimal power allocation strategy of one part is determined directly, and minimizing the system-sum-power consumption of the other part is converted into minimizing source-sum-power consumption, which can be solved easily through Karush-Kuhn-Tucker (KKT) condition. Through numerical simulations, we further justified the effectiveness of our scheme compared to existing works.

End-to-End Data Rate Performance of Decode-and-Forward Relaying with Different Resource Allocation Schemes

“…The performance and energy efficiency of relay enhanced networks have gained a lot of interest; see, for example, [5][6][7][8][9][10][11][12][13][14][15]. Recently the impact of buffer on the performance of DF relaying has also been investigated in references like [16].…”