多用户MIMO空分多址下行链路预编码算法研究

针对多输入多输出(MIMO)空分多址下行链路,每个接收天线看成独立的用户来分配波束,联合正交随机波束成形(ORBF)和迫零波束成形(ZFBF)实现了每用户配置多天线的预编码方法。为了降低计算复杂度,提出了联合线性结合技术的RBF-ZFBF的下行链路预编码方案。该方案利用ORBF确定初选用户,每个用户利用线性结合技术获得有效SINR,所选用户将使用线性结合方法获得的信道质量信息(CQI)和信道方向信息(CDI)反馈到基站,完成用户选择、波束选择和最终预编码。实验结果表明,该算法与每用户单天线方案相比,提高了系统吞吐量,证实了所提算法的有效性。

Research on Multi-user MIMO Space Division Multi-access Downlink Precoding Algorithms

For multiple-input multiple-output (MIMO) SDMA downlink channel, each receiving antenna seemed as independent users to be distributed the beam, and the joint orthonormal random beamforming (ORBF) and forced zero beam forming (ZFBF) realized precoding for each user configuration multi antennas. In order to reduce the computational complexity, we put forward a joint linear combined technique and RBF-ZFBF downlink precoding scheme. Based on ORBF algorithm, the primary users are determined, Each user get the effective SINR by using the linear combination technology, then the selected users feedback channel quality information (CQI) and the quantized channel direction information(CDI) by using linear combination method to base station, and complete the user selection, the beam selection and eventually precoding beamforming. The experimental results proves the validity of this algorithm and improves the system throughput performance, compared to the single receive antenna per user algorithm.