CQI feedback reduction based on spatial correlation in OFDMA system

Woongsup Lee, Dong Ho Cho

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

15 Citations (Scopus)


In OFDMA systems, channel quality information (CQI) feedback is used to determine the modulation and coding level of a mobile station (MS). When the MS uses diversity, it transmits the CQI feedback information which contains channel condition which is averaged over all the sub-bands allocated to itself. In conventional CQI feedback scheme, every MS should send its own CQI feedback. So, as the number of MSs in the system increases, the amount of CQI feedbacks increases too, and it results in the reduction of system throughput. To solve this problem, we have proposed a new CQI feedback scheme. In our CQI feedback scheme, MSs which are close each other make a CQI feedback group. And only one representative CQI feedback per one CQI feedback group is transmitted because MSs which are in the same CQI feedback group have similar channel condition. In this paper, we also have derived the PER equation of MSs when the MSs use a representative CQI feedback. And also, through simulations and numerical results, we have shown that by using our proposed scheme, CQI feedbacks can be reduced.

Original languageEnglish
Title of host publicationThe 68th IEEE Vehicular Technology Conference, VTC 2008-Fall
Publication statusPublished - 2008
Event68th Semi-Annual IEEE Vehicular Technology, VTC 2008-Fall, Conference - Calgary, AB, Canada
Duration: 2008 Sept 212008 Sept 24

Publication series

NameIEEE Vehicular Technology Conference
ISSN (Print)1550-2252


Other68th Semi-Annual IEEE Vehicular Technology, VTC 2008-Fall, Conference
CityCalgary, AB

All Science Journal Classification (ASJC) codes

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics


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