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 this paper, for a single-input multiple-output (SIMO) system aided by apassive reconfigurable intelligent surface (RIS), the joint transmissionaccomplished by the single transmit antenna and the RIS with multiplecontrollable reflective elements is considered. Relying on a general capacityupper bound derived by a maximum-trace argument, we respectively characterizethe capacity of such \rev{a} channel in the low-SNR or the rank-one regimes, inwhich the optimal configuration of the RIS is proved to be beamforming withcarefully-chosen phase shifts. To exploit the potential of modulating extrainformation on the RIS, based on the QR decomposition, successive interferencecancellation, and a strategy named \textit{partially beamforming and partiallyinformation-carrying}, we propose a novel transceiver architecture with only asingle RF front end at the transmitter, by which the considered channel can beregarded as a concatenation of a vector Gaussian channel and severalphase-modulated channels. Especially, we investigate a class of vector Gaussianchannels with a hypersphere input support constraint, and not only generalizethe existing result to arbitrary-dimensional real spaces but also present itshigh-order capacity asymptotics, by which both capacities ofhypersphere-constrained channels and achievable rates of the proposedtransceiver with two different signaling schemes can be well-approximated.Information-theoretic analyses show that the transceiver architecture designedfor the SIMO channel has a boosted multiplexing gain, rather than one for theconventionally-used optimized beamforming scheme.Numerical results verify ourderived asymptotics and show notable superiority of the proposed transceiver.

On RIS-Aided SIMO Gaussian Channels: Towards A Single-RF MIMO Transceiver Architecture