Precoder Design For Multi-Group Multicasting With a Common Message

This paper considers precoding for multi-group multicasting with a common message. The multiple antenna base station communicates with K clusters, each with L users. There is a common message destined to all users and a private multicast message for each cluster. We study the weighted sum rate (WSR)...

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Bibliographic Details
Published in:IEEE transactions on communications Vol. 67; no. 10; pp. 7302 - 7315
Main Authors: Yalcin, Ahmet Zahid, Yuksel, Melda
Format: Journal Article
Language:English
Published: New York IEEE 01.10.2019
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Algorithms
Antennas
Base stations
Common and private data transmission
Maximization
MIMO communication
Multicast communication
multicast transmission
Multicasting
multiple input multiple output
Optimization
physical layer precoding
Precoding
Silicon carbide
superposition coding
Unicast
ISSN:0090-6778, 1558-0857
Online Access:Get full text
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Summary:This paper considers precoding for multi-group multicasting with a common message. The multiple antenna base station communicates with K clusters, each with L users. There is a common message destined to all users and a private multicast message for each cluster. We study the weighted sum rate (WSR) maximization problem for two different schemes: 1) the base station transmits the superposition of common and multicast messages and 2) the base station concatenates the multicast message vector with the common message. We also formulate a second problem, weighted minimum mean square error (WMMSE) minimization, and prove that WSR maximization and WMMSE minimization are equivalent at the optimal solution. Inspired by the WMMSE problem, we suggest a suboptimal algorithm, based on alternating optimization. We apply this algorithm to the two transmission schemes and understand that there is a fundamental difference between the two. We compare the results with maximal ratio transmission (MRT) and zero-forcing (ZF) precoding and investigate the effects of the number of base station antennas, the number of groups, and the number of users in a group. Finally, we study imperfect successive interference cancellation (SIC) at the receivers and show that the first transmission scheme is more robust.
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ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2019.2931580