Convex separable problems with linear and box constraints
  In this work, we focus on separable convex optimization problems with linear and box constraints and compute the solution in closed-form as a function of some Lagrange multipliers that can be easily computed in a finite number of iterations. This allows us to bridge the gap between a wide family of power allocation problems of practical interest in signal processing and communications and their efficient implementation in practice. 
Antonio A. D'Amico and Luca Sanguinetti and Daniel P. Palomar
cs.IT math.IT