Performance improvement of transmit beamforming MISO system using optimum codebook indexing over feedback error channel

Jinhee Lee, Young-Chai Ko

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)


Transmit beamforming is simple method to achieve the full diversity gain that is available in multiple antenna (MIMO) wireless systems. Unfortunately, the prior condition to achieve this gain requires perfect channel knowledge at both transmitter and receiver, which is impractical on account of limited feedback link. Therefore, for the practical system, codebook based feedback scheme is often employed, where the beamforming vector is selected from the codebook to maximize the output signal-to-noise ratio (SNR) at receiver, and the receiver only sends back the index of the best beamforming vector to the transmitter. In this paper we derive analytical expression of average bit error rate (BER) for the codebook based transmit beamforming MISO system over the feedback error channel. Using this analytical result, we present optimum codebook indexing scheme to improve the performance of this system. From some selected numerical examples we show that our proposed codebook indexing scheme can provide nonnegligible performance improvements in terms of average BER over the severe feedback error channel.

Original languageEnglish
Title of host publicationIEEE International Symposium on Information Theory - Proceedings
Number of pages5
Publication statusPublished - 2008 Sep 29
Event2008 IEEE International Symposium on Information Theory, ISIT 2008 - Toronto, ON, Canada
Duration: 2008 Jul 62008 Jul 11


Other2008 IEEE International Symposium on Information Theory, ISIT 2008
CityToronto, ON


ASJC Scopus subject areas

  • Applied Mathematics
  • Modelling and Simulation
  • Theoretical Computer Science
  • Information Systems

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