A New Design of Polar-Cap Differential Codebook for Temporally/Spatially Correlated MISO Channels

作者：Choi Junil^*; Clerckx Bruno; Lee Namyoon; Kim Gil

来源：IEEE Transactions on Wireless Communications, 2012, 11(2): 703-711.

DOI：10.1109/TWC.2011.122211.110313

• Temporally/spatially correlated multiple-input single-output (MISO) channel
• limited feedback
• differential codebook

Accurate channel direction information is essential to achieve considerable capacity gains in multiple-input multiple-output (MIMO) wireless communication systems. Limited feedback using a polar-cap differential codebook which utilizes the temporal correlation in multiple-input single-output (MISO) channels is presented in this paper. We first describe the general properties of the polar-cap differential codebook and then explain the design methodology of the size of the polar-cap given the temporal correlation coefficient. We also propose an enhancement of the polar-cap differential codebook which is suitable for a spatially correlated channel. We compare the polar-cap differential codebook with a rotation-based differential codebook in terms of the chordal distance to demonstrate the superiority of the polar-cap differential codebook. Monte Carlo simulation results show that the polar-cap differential codebook facilitates a significant performance gain in both temporally and spatially correlated channels.

• 出版日期2012-2