Novel feedback bit allocation methods for multi-cell joint processing systems

Seungpyo Yu, Han Bae Kong, Young Tae Kim, Seok Hwan Park, Inkyu Lee

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

In this letter, we study multiple-input single-output joint processing (JP) systems with limited feedback where base stations exchange both channel state information and their data via ideal backhaul links. In order to optimize the sum-rate performance of the JP system, we propose a new feedback bit allocation scheme which maximizes quantization accuracy in the presence of pathloss. The quantization accuracy is formulated by the expectation of the inner product between the actual channel vector and the quantized channel vector. First, we derive the quantization accuracy as a closed form, which compensates the phase difference of two channels. Then, the maximum quantization accuracy is achieved by searching possible bit combinations. Simulation results show that the sum rate of our proposed feedback bit allocation strategy is more than twice compared to the conventional equal bit allocation method in the three cell case.

Original languageEnglish
Article number6226314
Pages (from-to)3030-3036
Number of pages7
JournalIEEE Transactions on Wireless Communications
Volume11
Issue number9
DOIs
Publication statusPublished - 2012 Jul 3

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Keywords

  • Multicell
  • limited feedback
  • multiple antennas

ASJC Scopus subject areas

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

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