Channel diagonalization for cloud radio access

Liang Liu, Pratik Patil, Wei Yu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1 Citation (Scopus)

Abstract

The diagonalization of a conventional multiple-input multiple-output (MIMO) channel into parallel and independent subchannels via singular value decomposition (SVD) is a fundamental strategy that allows the MIMO channel capacity to be achieved using scalar channel codes. This letter establishes a similar channel diagonalization result for the uplink and the downlink of a cloud radio access network (C-RAN), in which a central processor is connected to a remote radio head (RRH) serving a single user via rate-limit digital fronthaul carrying the compressed baseband signal. Specifically, we show that the diagonalization of the MIMO channel between the RRH and the user via SVD and the subsequent independent and parallel quantization of scalar signals and channel coding in each of the subchannels is optimal. This letter establishes this fact using the majorization theory. Further, an uplink-downlink duality for the multiple-antenna C-RAN is identified for this single-user case.

Original languageEnglish
Article number8286962
Pages (from-to)622-625
Number of pages4
JournalIEEE Wireless Communications Letters
Volume7
Issue number4
DOIs
Publication statusPublished - Aug 2018
Externally publishedYes

Keywords

  • Channel decomposition
  • cloud radio-access network (C-RAN)
  • uplink-downlink duality

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering

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