OFDMA-SDMA系统下行链路的资源分配

研究了采用正交频分多址-空分多址(OFDMA-SDMA)混合多址接入系统下行链路的无线资源分配问题，综合考虑了物理层上的约束条件（用户的误比特率性能以及信道的空间正交性）和媒体接入控制层的约束条件（用户对服务质量的要求和用户之间的公平性），提出了一种简单有效的信道/比特和功率分配方案。首先为每个子载波分配一组用户；然后为每个子载波上的用户组分配传输速率和功率。仿真结果表明，新算法的实现复杂度低，在保障用户服务质量的同时提高了资源的利用效率，并且兼顾了一定的公平性。

A Resource Allocation Scheme for OFDMA-SDMA Downlink

The resource allocation problem for the downlink of orthogonal frequency division multiple access-spatial division multiple access (OFDMA-SDMA) systems is studied. A simple and efficient algorithm is proposed, it jointly takes the constraints posed by the physical layer (in terms of bit error rate (BER) performance and spatial orthogonality) and the constraints posed by the media access control layer (in terms of quality of service requirements and user fairness). The resource allocation is divided into two steps: user selection and power allocation. Simulations show that the proposal enjoys a low implementation complexity. It improves the spectral efficiency significantly while maintaining quality of service (QoS) guarantees and certain fairness.