Bridging he Gap between linear and non-linear precoding in small- and large-scale MIMO downlinks

Chrisos Masouros, Mahini Sellahurai, Tharmalingam Ratnarajah

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

Abstract / Description of output

We propose a performance-complexity tradeoff for vector perturbation (VP) precoding in the downlink of multiuser multiple input multiple output (MU-MIMO) systems, that bridges the gap between linear and non-linear channel-inversion type precoding. To this end, we introduce a VP design that applies a performance-determined threshold to the desired norm of the preceded signal, to reduce the search through candidate perturbation vectors by the sphere encoder. Once this threshold is met, the search for the perturbation vectors finishes thus saving significant complexity at the transmitter. Towards future largescale MIMO systems, we test t he proposed tradeoff in systems with increasing transmit antennas is fixed physical space. While it is known that linear precoding becomes near-optimal in the massive MIMO region when ignoring transmit correlation, a) we show that t here still remains a performance gap between linear and non-linear precoding once realistic antenna array deployment is considered and b) we utilize the proposed scalable approach to bridge this gap. The presented analysis and results show that t he sum rates achieved are within 90% of those for conventional VP at less than half the computational complexity.

Original languageEnglish
Title of host publication2014 IEEE International Conference on Communications, ICC 2014
PublisherInstitute of Electrical and Electronics Engineers
Pages4483-4487
Number of pages5
ISBN (Print)9781479920037
DOIs
Publication statusPublished - 1 Jan 2014
Event2014 1st IEEE International Conference on Communications, ICC 2014 - Sydney, NSW, United Kingdom
Duration: 10 Jun 201414 Jun 2014

Conference

Conference2014 1st IEEE International Conference on Communications, ICC 2014
Country/TerritoryUnited Kingdom
CitySydney, NSW
Period10/06/1414/06/14

Keywords / Materials (for Non-textual outputs)

  • complexity reduction
  • multi-user MIMO
  • sphere encoding
  • Vector perturbation

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