A power-efficient ZF precoding scheme for multi-user indoor visible light communication systems

Qiong Zhao, Yangyu Fan, Lijun Deng, Bochao Kang

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

In this study, we propose a power-efficient ZF precoding scheme for visible light communication (VLC) downlink multi-user multiple-input-single-output (MU-MISO) systems, which incorporates the zero-forcing (ZF) and the characteristics of VLC systems. The main idea of this scheme is that the channel matrix used to perform pseudoinverse comes from the set of optical Access Points (APs) shared by more than one user, instead of the set of all involved serving APs as the existing ZF precoding schemes often used. By doing this, the waste of power, which is caused by the transmission of one user's data in the un-serving APs, can be avoided. In addition, the size of the channel matrix needs to perform pseudoinverse becomes smaller, which helps to reduce the computation complexity. Simulation results in two scenarios show that the proposed ZF precoding scheme has higher power efficiency, better bit error rate (BER) performance and lower computation complexity compared with traditional ZF precoding schemes.

Original languageEnglish
Pages (from-to)101-106
Number of pages6
JournalOptics Communications
Volume384
DOIs
StatePublished - 1 Feb 2017

Keywords

  • Computation complexity
  • Multi-user multiple-input single-output (MU-MISO)
  • Power efficiency
  • Precoding
  • Visible light communication (VLC)
  • Zero forcing (ZF)

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