Explicit vs. implicit feedback for SU and MU-MIMO

Bruno Clercks, Gil Kim, Junil Choi, Young Jun Hong

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

12 Citations (Scopus)

Abstract

SU and MU-MIMO performance relies on accurate link adaptation in order to benefit from multi-user scheduling, beamforming, adaptive coding and modulation. Such accuracy highly depends on the type of the channel state information feedback. LTE-Advanced has defined two major types of feedback, i.e. implicit and explicit feedback. Implicit feedback makes some assumptions on the transmit precoding and receiver processing at the time of CSI and CQI feedback. The CSI is expressed in terms of a recommended precoder, commonly denoted as PMI. Explicit feedback refers to the feedback of channel information without making any assumption on the transmit and receiver processing. In this paper, we discuss pros and cons of such feedback mechanisms for both SU and MU-MIMO and compare performance of both approaches using system level simulations compliant with LTE-A system. It is shown that implicit feedback is the preferred feedback framework for both SU and MU-MIMO.

Original languageEnglish
Title of host publication2010 IEEE Global Telecommunications Conference, GLOBECOM 2010
DOIs
Publication statusPublished - 2010
Externally publishedYes
Event53rd IEEE Global Communications Conference, GLOBECOM 2010 - Miami, FL, United States
Duration: 2010 Dec 62010 Dec 10

Other

Other53rd IEEE Global Communications Conference, GLOBECOM 2010
CountryUnited States
CityMiami, FL
Period10/12/610/12/10

Fingerprint

MIMO systems
Feedback
Channel state information
Beamforming
Processing
Scheduling
Modulation

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Clercks, B., Kim, G., Choi, J., & Hong, Y. J. (2010). Explicit vs. implicit feedback for SU and MU-MIMO. In 2010 IEEE Global Telecommunications Conference, GLOBECOM 2010 [5683816] https://doi.org/10.1109/GLOCOM.2010.5683816

Explicit vs. implicit feedback for SU and MU-MIMO. / Clercks, Bruno; Kim, Gil; Choi, Junil; Hong, Young Jun.

2010 IEEE Global Telecommunications Conference, GLOBECOM 2010. 2010. 5683816.

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

Clercks, B, Kim, G, Choi, J & Hong, YJ 2010, Explicit vs. implicit feedback for SU and MU-MIMO. in 2010 IEEE Global Telecommunications Conference, GLOBECOM 2010., 5683816, 53rd IEEE Global Communications Conference, GLOBECOM 2010, Miami, FL, United States, 10/12/6. https://doi.org/10.1109/GLOCOM.2010.5683816
Clercks B, Kim G, Choi J, Hong YJ. Explicit vs. implicit feedback for SU and MU-MIMO. In 2010 IEEE Global Telecommunications Conference, GLOBECOM 2010. 2010. 5683816 https://doi.org/10.1109/GLOCOM.2010.5683816
Clercks, Bruno ; Kim, Gil ; Choi, Junil ; Hong, Young Jun. / Explicit vs. implicit feedback for SU and MU-MIMO. 2010 IEEE Global Telecommunications Conference, GLOBECOM 2010. 2010.
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