NDLI: Hybrid zero-forcing for correlated and semi-orthogonal multi-user MU-MIMO channels

Content Provider	IET Digital Library
Author	Dhakal, Sunil Martin, Philippa A. Smith, Peter
Abstract	Fifth generation cellular networks must support dense user environments where close proximity users and highly correlated channels are prevalent. This study presents a novel decorrelating zero-forcing (DZF) scheme. It improves downlink zero-forcing (ZF) performance over multi-user multiple-input multiple-output channels when highly correlated users are present. DZF groups correlated users into pairs where the stronger user is labelled ‘near’ and the weaker user, ‘far’. For the far and unpaired users, the proposed design is similar to conventional ZF (CZF) in that the base station performs traditional ZF and the users employ the leading left singular vectors of the channel for processing. In contrast, the near users employ the second strongest left singular vector which decorrelates their effective channel with the paired far user. This reduces the noise inflation inherent in ZF for correlated channels. From simulations and analysis the authors demonstrate that DZF has both rate and fairness advantages over CZF when highly correlated users are present. Furthermore, they design a hybrid ZF (HZF) scheme, which harnesses the advantages of both CZF and DZF, hence providing robustness against the joint scheduling of semi-orthogonal and highly correlated users with very little additional complexity. Simulations clearly demonstrate that HZF has higher rates than CZF and DZF.
Starting Page	3575
Ending Page	3581
Page Count	7
ISSN	17518628
Volume Number	13
e-ISSN	17518636
Issue Number	Issue 20, Dec (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-com/13/20
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-com.2019.0167
Journal	IET Communications
Publisher Date	2019-10-09
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Base Station Performs Traditional ZF Cellular Radio Decorrelating Zero-forcing Dense User Environments Downlink Zero-forcing DZF Far User Highly Correlated Channel Highly Correlated User Hybrid Zero-forcing Hybrid ZF Scheme MIMO Communication Mobile Radio System Multiple-input Multiple-output Channel Multiuser Channel Paired Far User Proximity User Radio Link And Equipment Scheduling Statistics Stronger User Unpaired User Weaker User
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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