Paper Info
Title
Downlink MU-MIMO With QoS Aware Transmission: Precoder Design and Performance Analysis
Abstract
In this paper, a downlink wireless communication channel is considered. The base station (BS) has common data for all users, unicast data for a set of intended users, and transmits the superposition of these messages. This setting neither falls into the non-orthogonal multiple access (NOMA) nor into the multi-group multicasting literatures. In NOMA systems, the BS has unicast data for all users, and multiple users share the same resources. In multi-group multicasting, there are non-overlapping groups, each demanding a different multicast message. This paper studies precoder design to achieve maximum weighted sum rate (WSR). It is first shown that the precoders designed for WSR maximization and weighted minimum mean square error (WMMSE) minimization are equivalent. Second, an iterative low complexity algorithm (named WMMSE), based on WMMSE transmit precoders and receivers, is proposed. Another low-complexity precoder, the phase aligned zero forcing (PAZF) precoder, is also introduced. The results show that both algorithms converge fast. The WMMSE algorithm outperforms both PAZF and the zero-forcing (ZF) precoder for all signal-to-noise ratio ranges. It offers better interference management and high coherent combining gains for common data while PAZF finds the optimal phase rotation on the ZF precoder, and increases coherent combining gains.
Year
DOI
Venue
2019
10.1109/TWC.2018.2886903
IEEE Transactions on Wireless Communications
Keywords
Field
DocType
Unicast,Receivers,MIMO communication,NOMA,Precoding,Wireless communication
Base station,Wireless,Multi-user MIMO,Computer network,Minimum mean square error,Algorithm,Unicast,Multicast,Precoding,Mathematics,Telecommunications link
Journal
Volume
Issue
ISSN
18
2
1536-1276
Citations 
PageRank 
References 
2
0.36
0
Authors
3
Name
Order
Citations
PageRank
Ahmet Zahid Yalcin141.72
Melda Yuksel2477.46
Israfil Bahceci3273.10