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 Tools annual

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 Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Due to the limited number of traditional orthogonal pilots, pilot collisionwill severely degrade the performance of contention-based grant-freetransmission. To alleviate the pilot collision and exploit the spatial degreeof freedom as much as possible, an extremely sparse orthogonal pilot scheme isproposed for uplink grant-free transmission. The proposed sparse pilot is usedto perform active user detection and estimate the spatial channel. Then,inter-user interference suppression is performed by spatially combining thereceived data symbols using the estimated spatial channel. After that, theestimation and compensation of wireless channel and time/frequency offset areperformed utilizing the geometric characteristics of combined data symbols. Thetask of pilot is much lightened, so that the extremely sparse orthogonal pilotcan occupy minimized resources, and the number of orthogonal pilots can beincreased significantly, which greatly reduces the probability of pilotcollision. The numerical results show that the proposed extremely sparseorthogonal pilot scheme significantly improves the performance inhigh-overloading grant-free scenario.

Contention-based Grant-free Transmission with Extremely Sparse Orthogonal Pilot Scheme