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

We consider downlink cellular multi-user communication between a base station(BS) having N antennas and M single-antenna users, i.e., an N X M GaussianBroadcast Channel (GBC). Under an average only total transmit power constraint(APC), large antenna arrays at the BS (having tens to a few hundred antennas)have been recently shown to achieve remarkable multi-user interference (MUI)suppression with simple precoding techniques. However, building large arrays inpractice, would require cheap/power-efficient Radio-Frequency(RF) electroniccomponents. The type of transmitted signal that facilitates the use of mostpower-efficient RF components is a constant envelope (CE) signal. Under certainmild channel conditions (including i.i.d. fading), we analytically show that,even under the stringent per-antenna CE transmission constraint (compared toAPC), MUI suppression can still be achieved with large antenna arrays. Ouranalysis also reveals that, with a fixed M and increasing N, the totaltransmitted power can be reduced while maintaining a constantsignal-to-interference-noise-ratio (SINR) level at each user. We also propose anovel low-complexity CE precoding scheme, using which, we confirm ouranalytical observations for the i.i.d. Rayleigh fading channel, throughMonte-Carlo simulations. Simulation of the information sum-rate under theper-antenna CE constraint, shows that, for a fixed M and a fixed desiredsum-rate, the required total transmit power decreases linearly with increasingN, i.e., an O(N) array power gain. Also, in terms of the total transmit powerrequired to achieve a fixed desired information sum-rate, despite the stringentper-antenna CE constraint, the proposed CE precoding scheme performs close tothe GBC sum-capacity (under APC) achieving scheme.

Constant Envelope Precoding for Power-Efficient Downlink Wireless Communication in Multi-User MIMO Systems Using Large Antenna Arrays