Queue-based Sub-carrier Grouping For Feedback Reduction In OFDMA Systems

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Provided by: University of Texas at Arlington
Topic: Mobility
Format: PDF
Sub-carrier grouping is a popular feedback reduction approach for Orthogonal-Frequency-Division Multiple-Access (OFDMA) systems that has been adopted into fourth-generation standards such as 3GPP Long Term Evolution (LTE). Feedback reduction is motivated by the fact that the bandwidth expenditure in acquiring full information in a downlink OFDMA system scales as the product of the number of users and the number of OFDMA bands. As this is infeasible in most systems, sub-carrier grouping calls for users to report a single channel state value per pre-designated group of OFDM bands.
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