Resource allocation for multiple input multiple output‐orthogonal frequency division multiplexing ‐based space division multiple access systems

Abstract

The problem of the system throughput maximisation and the fairness issue among users is considered for the downlink multiuser multiple input multiple output-orthogonal frequency division multiplexing system with MMSE precoding. Since finding the optimal solution by using the exhaustive search has very high computational burden, the authors propose a lowcomplexity user selection strategy plus the optimal power allocation in this study. With resorting to the mathematical simplification process, the proposed user selection scheme is designed to compare the related value of SINR. The power allocation is performed after the user selection. However, the power allocation is not in interference-free environment but in the presence of crosstalk, which is a nonlinear non-convex optimisation problem. In this study, the authors use an optimisation technique to obtain the optimal solution of the constrained non-convex nonlinear problem by replacing the objective function with a difference of two convex functions. A bisection-based strategy to solve this problem with interference-awareness to find local optimal solutions is presented in this study. Simulation results show that the performance of the proposed algorithm is close to that of the optimal solution. The trade-off between the system throughput and the fairness among users is also considered.

Research on real-time network data mining technology for big data

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Design and Implementation of Massive Information Management System Based on Big Data

“…More and more enterprise managers realize the importance of information management, it is necessary for enterprises to obtain competitive advantage to set up enterprise management information system by using advanced information technology. It has great significance to study the optimal design method of mass information management system, so as to optimize information management and improve big data's ability of information scheduling [2] .…”

Subcarrier and Power Allocation for Multiuser MIMO-OFDM Systems with Various Detectors

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