English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We consider an orthogonal frequency division multiple access (OFDMA)scheduling system. A scheduling unit block consists of contiguous multiplesubcarriers. Users are scheduled based on their block average throughput in aproportional fair way. The multiuser diversity gain increases with the degreeand dynamic range of channel fluctuations. %Lack of diversity in a limitedfrequency selective channel may decrease the sum rate. However, a decrease ofthe block average throughput in a too much selective channel may lessen the sumrate as well. In this paper, we first study optimal channel selectivity in viewof maximizing the maximum of the block average throughput of an arbitrary user.Based on this study, we then propose a method to determine a per-user optimalcyclic delay when cyclic delay diversity (CDD) is used to enhance the sum rateby increasing channel selectivity for a limited fluctuating channel. We showthat the proposed technique achieves better performance than a conventionalfixed cyclic delay scheme and that the throughput is very close to the optimalsum rate possible with CDD.

On the optimal frequency selectivity to maximize multiuser diversity in an OFDMA scheduling system