LTE-A系统下码本的设计，此为一种分层扰动码本，主码本为kerdock码本，辅码本为酉矩阵，分层码本的设计更加优化了系统的预编码性能。-LTE-A system, a codebook design, this is a layered the disturbance codebook, the master codebook the kerdock codebook auxiliary codebook for the unitary matrix, the hierarchical cod