Precoder Design For Multi-Group Multicasting With a Common Message

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2019-10-01

Author

Yalcin, Ahmet Zahid
Yüksel Turgut, Ayşe Melda

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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.

Subject Keywords

Common and private data transmission, multicast transmission, multiple input multiple output, physical layer precoding, superposition coding, SUM-RATE MAXIMIZATION, MIMO BROADCAST, CHANNEL

URI

https://hdl.handle.net/11511/96672

Journal

IEEE TRANSACTIONS ON COMMUNICATIONS

DOI

https://doi.org/10.1109/tcomm.2019.2931580

Collections

Department of Electrical and Electronics Engineering, Article

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Citation Formats

A. Z. Yalcin and A. M. Yüksel Turgut, “Precoder Design For Multi-Group Multicasting With a Common Message,” IEEE TRANSACTIONS ON COMMUNICATIONS, vol. 67, no. 10, pp. 7302–7315, 2019, Accessed: 00, 2022. [Online]. Available: https://hdl.handle.net/11511/96672.