The Codebook Design for MIMO Precoding Systems in LTE and LTE-A

The codebook based precoding is a promising technology adopted by Long Term Evolution (LTE), which fixes a common codebook comprising a set of vectors and matrices at both the transmitter and the receiver. For the codebook design, it is necessary to achieve high precoding gain, lower feedback overhead and flexibility to support various antenna configurations and different numbers of data streams. The generation of codebook in LTE is illustrated in detail and while the preceding approaches provide steady improvements in wireless communications, further improvements still may be made to achieve the acquirements of LTE-Advanced (LTE-A). It is important to set some guidelines, and according to these guidelines a new 8Tx codebook design scheme is given.