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提出了一种新型8天线双码本设计方法,有效提高了TD-LTE-Advanced系统频谱效率.该方法根据层映射的层数对码本分组,层数为1、2及5~8时,利用R8协议中4天线码本的满秩矩阵生成码本;层数为3、4时,将离散傅里叶变换矩阵与循环延迟分集技术相结合构造新码本.与R10协议中给出的8天线双码本相比,在反馈开销相同的情况下,新码本码字间距更大.仿真结果表明,在8发2收层数为2的条件下,新码本增益提高2dB以上;当信噪比为5 dB时,新码本比现有码本的频谱效率高15%以上.
A new 8-antenna dual-codebook design method is proposed to effectively improve the spectral efficiency of TD-LTE-Advanced system. This method divides the codebook according to the layer number of layer mapping. When the number of layers is 1, 2 and 5 to 8, The codebook is generated by using the full rank matrix of the 4 antenna codebook in the R8 protocol and the new codebook is constructed by combining the discrete Fourier transform matrix with the cyclic delay diversity technique when the number of layers is 3 and 4. In combination with the R10 protocol Compared with 8-antenna dual-codebook, the new codebook code spacing is greater under the same feedback overhead.The simulation results show that the new codebook gain is increased by more than 2dB under the condition of 8-layer-2 acquisition number 2, When SNR is 5 dB, the new codebook is more than 15% more efficient than the existing codebook.