WMMSE-Based Joint Transceiver Design for Multi-RIS Assisted Cell-free Networks Using Hybrid CSI

Kaydedildi:

Detaylı Bibliyografya
Yayımlandı:	arXiv.org (Dec 4, 2024), p. n/a
Yazar:	Pan, Xuesong
Diğer Yazarlar:	Zheng, Zhong, Huang, Xueqing, Zesong Fei
Baskı/Yayın Bilgisi:	Cornell University Library, arXiv.org
Konular:	Probability theory Communications systems Central processing units > CPUs Algorithms Asymptotic properties Beamforming Operators (mathematics) Error detection Reconfigurable intelligent surfaces
Online Erişim:	Citation/Abstract Full text outside of ProQuest
Etiketler:	Etiketle Etiket eklenmemiş, İlk siz ekleyin!

Diğer Bilgiler
Özet:	In this paper, we consider cell-free communication systems with several access points (APs) serving terrestrial users (UEs) simultaneously. To enhance the uplink multi-user multiple-input multiple-output communications, we adopt a hybrid-CSI-based two-layer distributed multi-user detection scheme comprising the local minimum mean-squared error (MMSE) detection at APs and the one-shot weighted combining at the central processing unit (CPU). Furthermore, to improve the propagation environment, we introduce multiple reconfigurable intelligent surfaces (RISs) to assist the transmissions from UEs to APs. Aiming to maximize the weighted sum rate, we formulate the weighted sum-MMSE (WMMSE) problem, where the UEs' beamforming matrices, the CPU's weighted combining matrix, and the RISs' phase-shifting matrices are alternately optimized. Considering the limited fronthaul capacity constraint in cell-free networks, we resort to the operator-valued free probability theory to derive the asymptotic alternating optimization (AO) algorithm to solve the WMMSE problem, which only depends on long-term channel statistics and thus reduces the interaction overhead. Numerical results demonstrate that the asymptotic AO algorithm can achieve a high communication rate as well as reduce the interaction overhead.
ISSN:	2331-8422
Kaynak:	Engineering Database