Performance of Cross-layer Design with Multiple Outdated Estimates in Multiuser MIMO System
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Date
2014-09
Authors
Yu, Xiangbin
Liu, Yan
Li, Yang
Zhu, Qiuming
Yin, Xin
Qln, Kecang
ORCID
Advisor
Referee
Mark
Journal Title
Journal ISSN
Volume Title
Publisher
Společnost pro radioelektronické inženýrství
Abstract
By combining adaptive modulation (AM) and automatic repeat request (ARQ) protocol as well as user scheduling, the cross-layer design scheme of multiuser MIMO system with imperfect feedback is presented, and multiple outdated estimates method is proposed to improve the system performance. Based on this method and imperfect feedback information, the closed-form expressions of spectral efficiency (SE) and packet error rate (PER) of the system subject to the target PER constraint are respectively derived. With these expressions, the system performance can be effectively evaluated. To mitigate the effect of delayed feedback, the variable thresholds (VTs) are also derived by means of the maximum a posteriori method, and these VTs include the conventional fixed thresholds (FTs) as special cases. Simulation results show that the theoretical SE and PER are in good agreement with the corresponding simulation. The proposed CLD scheme with multiple estimates can obtain higher SE than the existing CLD scheme with single estimate, especially for large delay. Moreover, the CLD scheme with VTs outperforms that with conventional FTs.
Description
Citation
Radioengineering. 2014, vol. 23, č. 3, s. 863-871. ISSN 1210-2512
http://www.radioeng.cz/fulltexts/2014/14_03_0863_0871.pdf
http://www.radioeng.cz/fulltexts/2014/14_03_0863_0871.pdf
Document type
Peer-reviewed
Document version
Published version
Date of access to the full text
Language of document
en