摘要： 2D预编码技术通过数据处理仅能在水平方向调整波束,对于多用户系统尤其是基站边缘用户会造成严重的小区间干扰。针对该问题,在频分双工3D MIMO异构网络系统中,利用随机几何研究有限反馈机制下反馈开销对系统性能的影响。并在基站部署均匀平面阵列的基础上,提出基于水平发射角和垂直下倾角的3D MIMO多用户码本设计方案,且对所设计的码本方案进行仿真分析。结果表明,反馈开销以及微基站密度影响系统吞吐量,甚至影响到3D预编码方案的误码率。与基于2D和3D离散傅里叶变换码本的预编码方案相比,该方案大幅降低了系统的误码率,并提高了系统的吞吐量,优化了系统性能。

关键词: 3D预编码, 随机几何, 量化误差, 反馈开销, 码本, 水平发射角, 垂直下倾角

Abstract: The 2D precoding technology can only adjust the beam in the horizontal direction through data processing,and it will cause the serious inter-cell interference for the multi-user system,especially the base station edge user.Aiming at this problem,this paper studies the effect of feedback overhead on the performance of the system using stochastic geometry under limited feedback mechanism in frequency division duplex 3D MIMO heterogeneous network system.And under the deployment of uniform planar array antenna in base station,the design scheme of 3D MIMO multiuser codebook based on horizontal emission angle and vertical dip angle is proposed,and the codebook scheme is simulated and analyzed.Results show that the feedback overhead and micro base station density affects the throughput of the system,and even affects the bit error rate of 3D precoding scheme.Comparing with the 2D and 3D discrete Fourier transform codebook precoding scheme,the proposed scheme can greatly reduce the bit error rate of the system,improve the throughput of the system,and optimize the performance of the system.

Key words: 3D precoding, stochastic geometry, quantization error, feedback overhead, codebook, horizontal emission angle;vertical dip angle

中图分类号: 

• TP393