Abstract
In classical MIMO systems, singular value decomposition (SVD) is adopted as a common way to decompose the MIMO channel into parallel subchannels. However, in addition to its high complexity, it is also sensitive to the ill-conditioning of the channel matrix. In this paper, we propose a channel decomposition strategy called LDLH decomposition for low complexity MIMO precoder design. We show that the computation complexity of LDLH achieves one degree of magnitude lower than that of SVD, as well as some SVD-based decomposition scheme such as geometric mean decomposition (GMD) and uniform channel decomposition (UCD). In addition, we also show that LDLH-based precoder requires less quantization effort and feedback bandwidth.