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http://dx.doi.org/10.5573/ieie.2015.52.7.022

Determination and Performance Evaluation of a Codebook for MIMO Systems Utilizing Statistical Properties of The Spatial Channel Model  

Suh, Junyeub (Department of Electronic Engineering, Sogang University)
Kang, Hosik (Department of Electronic Engineering, Sogang University)
Sung, Wonjin (Department of Electronic Engineering, Sogang University)
Publication Information
Journal of the Institute of Electronics and Information Engineers / v.52, no.7, 2015 , pp. 22-30 More about this Journal
Abstract
For long-term evolution (LTE) MIMO transmission, codebooks are used to utilize the estimated channel information under the limited feedeback environment, and related study has been actively performed. Existing codebooks include codevectos constructed based on vector quantization (VQ) and discrete Fourier transform (DFT), and the LTE standard specifies codebooks modified from these examples to support up to 8 transmit antennas. As the number of antennas increases and as the spatial channel model is used as a standard environment to evaluate the LTE transmission performance, new beamforming methods as well as codebook designs are needed. In this paper, we implement the 3-dimensional spatial channel model (3D-SCM) to analyze the key statistical characteristics of the generated channel, and present efficient ways of determining corresponding codebooks. In particular, we propose a nonuniform-phase DFT-based codebook to improve the existing uniform-phase DFT-based codebook, and evaluate its performance under the given SCM transmission environment. There exists a strong tendancy in statistical distributions of the phase difference between adjacent antenna elements for the SCM, which can be appropriately exploited in codebook design to produce a performance gain over the existing design.
Keywords
MIMO; 3D-SCM; CSI; feedback; codebook; DFT; VQ;
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