Low Complexity Resource Allocation for Multiuser Uplink Communication Systems

In this paper, we address a practical and large-dimensional problem of joint design of modulation and coding scheme (MCS) and transmit power allocation for an uplink massive multi-antenna system serving multiple users. We propose to jointly optimize the MCS and the transmit power for all the active users in a centralized approach. For this purpose, we formulate a joint MCS and power allocation problem as a multi-dimensional discrete optimization problem and develop a successive coordinate search (SCS) algorithm to obtain optimal solution while yielding low computational complexity. Compared to the brute-force exhaustive search procedure that incurs prohibitively high computational complexity, our proposed approach is shown to solve the problem with much lower computational complexity. Simulation results reveal that our developed SCS algorithm performs very close to the optimal solution for different number of users and antenna configurations.