【摘要】 大规模MIMO系统中的预编码技术是5G网络中的关键技术之一。针对大规模MIMO通信系统中旋转离散傅里叶变换(DFT)码本的用户端码字搜索问题,提出了一种低复杂度的码本搜索方法。该方法根据旋转DFT码本相同列的弦距离最小,且弦距离越小的预编码向量其相关性越强的特点,将所有水平维码本和垂直维码本分别进行分组,得到信道增益最大的水平维最优码字和垂直维最优码字,以构成3D预编码码本。仿真结果表明所提出的搜索方法在保证了系统性能的同时显著降低了搜索复杂度,并且随着天线数目的增加优势更加明显。更多还原

【Abstract】 In Massive MIMO systems for 5G networks,precoding technology is one of the key technologies.Aiming at user side codebook search method of the discrete Fourier transform(DFT) rotation codebook,a low complexity search algorithm was proposed.In this algorithm,all horizontal and vertical codebooks were grouped separately according to the characteristics that the precoding vectors with the same column of DFT rotation codebooks had the smallest chordal distance and the smaller chordal distance have the stronger correlation,and then the optimal horizontal and vertical codewords with maximum channel gain were obtained to form 3D precoding code-books.The simulation results indicate that the searching complexity of the proposed method is significantly reduced under conditions of insuring the system performance,moreover,this advantage becomes greater with the number of antennas increasing.更多还原