1 research outputs found
An Effective Limited Feedback Scheme for FD-MIMO Based on Noncoherent Detection and Kronecker Product Codebook
The low complexity quantization of channel state information (CSI) and the
utilization of vertical freedom of three dimension (3D) channels are two
critical issues in the limited feedback design of the \emph{full dimension
multi-input-multi-output} (FD-MIMO) systems. In this paper, we propose an
effective limited feedback scheme. We first employ Kronecker product based
codebook (KPC) to explore the vertical freedom of 3D channels, extending the
limited feedback from two dimension (2D) to 3D. Fruthermore, we use noncoherent
sequence detection (NCSD) to quantify the CSI which includes both the vertical
and horizontal channel information. This quantization method exploits the
duality between codebook searching and NCSD to transform the CSI quntization on
KPC to two parallel NCSD. The complexity is reduced from exponential to linear
with the number of antennas. We also show the proposed scheme does not affect
the diversity gain of the system by demonstrating the full diversity order.
Monte Carlo simulation results show that the proposed scheme provides at least
1.2dB coding gain compared with traditional 2D limited feedback schemes.
Moreover, the proposed scheme outperforms other FD/3D CSI quantization schemes
by 0.8dB coding gain with moderate complexity when the channel is highly
spatially correlated.Comment: 7 pages,conferenc