A new design of polar-cap differential codebook for temporally/spatially correlated MISO channels

Junil Choi, Bruno Clerckx, Namyoon Lee, Gil Kim

Research output: Contribution to journalArticlepeer-review

59 Citations (Scopus)


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.

Original languageEnglish
Article number6117043
Pages (from-to)703-711
Number of pages9
JournalIEEE Transactions on Wireless Communications
Issue number2
Publication statusPublished - 2012 Feb


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

ASJC Scopus subject areas

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics


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