In addition, from (21) and the algorithm solving for water level, the two water levels v1 and v2 can be unified as a single global water level and the power allocation scheme can be explained as a cooperative global WF process relative to the traditional WF power allocation.
Further, we propose a metric that gives the relative goodness of node pairs for being potential winners for power allocation from the global power optimizer.
Practically, in order to minimize the global transmission power, the optimization of the power allocation is performed between the source and the relay by using information theoretic tools.
In this case, the optimization problem turns to the joint power allocation, for which the global optimality can be guaranteed under high-SNR approximation.
Otherwise, Qian et al. [3] proposes a MAPEL (Multiplicative linear fractional programming-based power allocation) algorithm to achieve global optimality for a non-convex wireless single-antenna-based power control problem.
In summary, the (non-trivial) task of each sector controller is to find a scheduling decision (being an assignment of available resources on PRBs– to users) and a suitable power allocation, such that a global network utility function is maximized.
Power allocation: what is the optimal power allocation policy for each SU in its allocated bands?
Particularly, it was revealed that as the rate of the system is a concave function of the transmission power, a unique global maximum energy efficiency exists that can be achieved through an optimum power allocation strategy using fractional programming.
The rest of this article is structured as follows: First, the analysed system model, basic assumptions, relay protocols and a formal problem description are introduced in 2. Afterwards, optimal and near-optimal algorithms to solve the global resource allocation problem (3) as well as carrier allocation (4) and power allocation (5) subproblems are derived.
The BEP performance for the DF distributed BF scheme with equal power allocation approaches the BEP performance of the optimum power assignment under global power sum constraint.
