Extension of 4-Tx Precoding Codebook to 8-Tx Downlink Closed-Loop MIMO

摘要

The codebook based precoding is an effective form of limited feedback closed-loop multiple input multiple output (MIMO) scheme. An efficient methodology to build low complexity and high performance codebook is crucial for the closed-loop MIMO precoding algorithm. In this paper, we present a simplified codebook design scheme for 8-Tx MIMO based on the 4-Tx codebook in LTE Rel-8 and Kronecker product. In additional to low complexity and good backward compatibility properties, the codebook design based on this method can inherit most of the desired properties of Rel-8 codebook.