  The problem of joint sub-channel, power control and antenna selection in the
uplink of OFDMA networks is investigated. The corresponding optimization
problem is a non convex mixed integer non-linear problem(MINLP). To tackle the
problem, an iterative two-step optimization problem is devised. First,~Having
fixed the selected antenna as well as the associated power of each user,~a
sub-channel assignment problem using the so-called Hungarian method is
proposed. Second, the joint power and antenna selection problem is extended
into a more elegant form through adding a penalty term to the objective
function forcing the relaxed boolean variables associated with antenna
selection problem to take binary values. To this end, the problem is restated
as a difference of two concave function (DC programming) and is effectively
solved in an iterative manner. The foregoing procedure is iteratively repeated
until approaching a fixed network throughput. Simulation results demonstrate
the superiority of the proposed method w.r.t. the exhaustive search with fixed
power control mechanism.
