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

In cell-free multiple input multiple output (MIMO) networks, multiple basestations (BSs) collaborate to achieve high spectral efficiency. Nevertheless,high penetration loss due to large blockages in harsh propagation environmentsis often an issue that severely degrades communication performance. Consideringthat intelligent reflecting surface (IRS) is capable of constructing digitallycontrollable reflection links in a low-cost manner, we investigate anIRS-enhanced downlink cell-free MIMO network in this paper. We aim to maximizethe sum rate of all the users by jointly optimizing the transmit beamforming atthe BSs and the reflection coefficients at the IRS. To address the optimizationproblem, we propose a fully distributed machine learning algorithm. Differentfrom the conventional iterative optimization algorithms that require a centralprocessing at the central processing unit (CPU) and large amount of channelstate information and signaling exchange between the BSs and the CPU, in theproposed algorithm, each BS can locally design its beamforming vectors.Meanwhile, the IRS reflection coefficients are determined by one of the BSs.Simulation results show that the deployment of IRS can significantly boost thesum user rate and that the proposed algorithm can achieve a high sum user ratewith a low computational complexity.

A Distributed Machine Learning-Based Approach for IRS-Enhanced Cell-Free MIMO Networks