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Adaptive Resource Allocation Algorithms for Multi-user MIMO-OFDM Systems

机译：多用户MIMO-OFDM系统的自适应资源分配算法

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摘要

Radio resource allocation to the system users is the key challenge issue in multiuser orthogonal frequency division multiplexing (MU-OFDM) systems. In this paper, an efficient and low-complexity proportional rate-adaptive radio resource (sub-carrier and power) allocation algorithm for MU-OFDM is proposed to maximize the sum-rate capacity of the system and achieve acceptable users' rates fairness. Three-dimensional (spatial, frequency, and multi-user) greedy power allocation (GPA) algorithms for the MU multi-input multi-output OFDM (MU MIMO-OFDM) systems are proposed. The proposed algorithms start with spatial sub-carrier allocation followed by an optimal two-dimensional spatial-frequency GPA (SFGPA) step, which exploits both the spatial and frequency diversities. Therefore, spatial, frequency, and multi-user diversities are exploited by the proposed three-dimensional GPA algorithms. Several experiments are carried out to test the performance of the proposed three-dimensional GPA algorithms in terms of sum-rate capacity. The optimal solution is achieved by the three-dimensional dynamic sub-carrier-SFGPA with average gain (DS-SFGPA-AG) algorithm, which achieves the best sum-rate capacity performance compared with the other power allocation algorithms. The performance of the DS-SFGPA-AG algorithm is also analyzed and compared for the four OFDM-based systems; single-user (SU) OFDM, SU MIMO-OFDM, MU OFDM, and MU MIMO-OFDM. The MU MIMO-OFDM system with adaptive sub-carrier and power allocation outperforms the other systems.
机译：在多用户正交频分复用（MU-OFDM）系统中，向系统用户分配无线电资源是关键的挑战问题。本文提出了一种有效且低复杂度的比例速率自适应无线资源（子载波和功率）分配算法，用于最大化系统的总速率容量并达到可接受的用户速率公平性。提出了用于MU多输入多输出OFDM（MU MIMO-OFDM）系统的三维（空间，频率和多用户）贪婪功率分配（GPA）算法。所提出的算法从空间子载波分配开始，然后是优化的二维空间频率GPA（SFGPA）步骤，该步骤利用了空间和频率多样性。因此，提出的三维GPA算法可以利用空间，频率和多用户多样性。进行了几个实验，以求和速率容量来测试所提出的三维GPA算法的性能。带有平均增益的三维动态子载波-SFGPA（DS-SFGPA-AG）算法可实现最佳解决方案，与其他功率分配算法相比，该算法可实现最佳的总速率容量性能。还针对四种基于OFDM的系统分析和比较了DS-SFGPA-AG算法的性能;单用户（SU）OFDM，SU MIMO-OFDM，MU OFDM和MU MIMO-OFDM。具有自适应子载波和功率分配的MU MIMO-OFDM系统优于其他系统。

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