Feedback reduction schemes for MIMO broadcast channels

Adeel Razi, Jinhong Yuan

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

2 Citations (Scopus)


In this paper schemes for feedback reduction in MIMO broadcast channels are considered for a multi-user system. We consider a case where the number of single antenna users K >> M where M is the size of antenna array at the base station (BS). We consider zero-forcing beamforming system with semi-orthogonal user selection algorithm in which channel state information is splitted into channel quality information (CQI) and channel direction information (CDI). In such a user-dense multi-user system feedback channel is inundated if all the users are feedbacking even in the case where only a limited feedback is employed. In order to reduce the feedback load we propose threshold based schemes in which threshold is applied on CQI or CDI. We show that by employing proposed feedback reduction schemes feedback load can be significantly reduced without sacrificing much of the sum-capacity of the system.

Original languageEnglish
Title of host publication2008 IEEE 19th International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2008
Publication statusPublished - 2008
Externally publishedYes
EventIEEE International Symposium on Personal and Indoor Mobile Radio Conference 2008 - Palais des Festivals, Cannes, France
Duration: 15 Sep 200818 Sep 2008
Conference number: 19th (Proceedings)


ConferenceIEEE International Symposium on Personal and Indoor Mobile Radio Conference 2008
Abbreviated titlePIMRC 2008
Internet address

Cite this