NDLI: Combining Pre- and post-processing with Tomlinson-Harashima precoding in downlink MU-MIMO with each user having arbitrary number of antennas

Content Provider	IEEE Xplore Digital Library
Author	Chavali, N.K. Reddy, V.U. Kuchi, K.
Copyright Year	2014
Description	Author affiliation: Uurmi Syst. Pvt Ltd., Hyderabad, India (Chavali, N.K.) \|\| Electr. Eng. Dept., IIT Hyderabad, Hyderabad, India (Reddy, V.U.; Kuchi, K.)
Abstract	In downlink multiuser (MU) MIMO (multiple-input multiple-output) system, precoding at the transmitter should be such that the data symbols meant for $i^{th}$ user do not cause interference at $k^{th}$ user, k ≠ i, while ensuring that the transmitted power is unchanged by the precoding. Dirty paper coding (DPC) meets these conditions, but its practical implementation is very complex. Tomlinson-Harashima precoding (THP) ensures interference-free communication to the users like DPC, with very little increase in the transmitted power, and its implementation is much less complex compared to that of DPC. Block diagonalization based precoding also meets these conditions, but at the cost of increased number of antennas at the transmitter, and the increase depends on the number of antennas of the users. In the downlink MU-MIMO with THP, it is known that the transmitter with $N_{t}$ antennas can serve $N_{t}$ users, with each user having one antenna, thereby transmitting one stream of symbols (we refer to this as one layer) to each user. To the best of our knowledge, MU-MIMO with THP has not addressed the case of $N_{t}$ users, with each user having arbitrary number of antennas. In this paper, we first show that by combining pre-processing with THP at the transmitter and performing post-processing at each user, $N_{t}$ users, each with arbitrary number of antennas, can be served with one layer each. Pre-processing involves vectors, matched to the coefficients of the user channels from an a priori chosen transmitter antenna for each user, which serve as the postprocessing vectors for the users. Next, we show that if number of users, say M, is less than the number of antennas at the transmitter, then the $N_{t}$ layers can be distributed among M users, provided the total number of receiving antennas of M users is ≥ $N_{t}.$ The transmitter has to send minimal information to the users to enable decoding of their layers.
Starting Page	1
Ending Page	4
File Size	181660
Page Count	4
File Format	PDF
e-ISBN	9781479946655
DOI	10.1109/SPCOM.2014.6983976
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-07-22
Publisher Place	India
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Transmitting antennas Receiving antennas Downlink Vectors MIMO
Content Type	Text
Resource Type	Article

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