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

Reconfigurable intelligent surface (RIS) is a promising technology to enhancethe spectral efficiency of wireless communication systems. By optimizing theRIS elements, the performance of the overall system can be improved. Yet, incontrast to single-carrier systems, in multi-carrier systems, it is notpossible to independently optimize RIS elements at each sub-carrier, which mayreduce the benefits of RIS in multi-user orthogonal frequency divisionmultiplexing (OFDM) systems. To this end, we investigate the effectiveness ofRIS in multiple-input, multiple-output (MIMO) OFDM broadcast channels (BC). Weformulate and solve a joint precoding and RIS optimization problem. We showthat RIS can significantly improve the system performance even when the numberof RIS elements per sub-band is very low.

Maximization of minimum rate in MIMO OFDM RIS-assisted Broadcast Channels