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

Directional transmission patterns (a.k.a. narrow beams) are the key towireless communications in millimeter wave (mmWave) frequency bands whichsuffer from high path loss and severe shadowing. In addition, the propagationchannel in mmWave frequencies incorporates only a few number of spatialclusters requiring a procedure to align the corresponding narrow beams with theangle of departure (AoD) of the channel clusters. The objective of thisprocedure, called beam alignment (BA) is to increase the beamforming gain forsubsequent data communication. Several prior studies consider optimizing BAprocedure to achieve various objectives such as reducing the BA overhead,increasing throughput, and reducing power consumption. While these studiesmostly provide optimized BA schemes for scenarios with a single active user,there are often multiple active users in practical networks. Consequently, itis more efficient in terms of BA overhead and delay to design multi-user BAschemes which can perform beam management for multiple users collectively. Thispaper considers a class of multi-user BA schemes where the base stationperforms a one shot scan of the angular domain to simultaneously localizemultiple users. The objective is to minimize the average of expected width ofremaining uncertainty regions (UR) on the AoDs after receiving users'feedbacks. Fundamental bounds on the optimal performance are analyzed usinginformation theoretic tools. Furthermore, a beam design optimization problem isformulated and a practical BA scheme, which provides significant gains comparedto the beam sweeping used in 5G standard is proposed.

On Optimal Multi-user Beam Alignment in Millimeter Wave Wireless Systems