NDLI: A Modified Iterative Water-filling Algorithm with Per-iteration Power Normalization in Multiuser MMSE-Precoded MIMO Systems

Content Provider	IEEE Xplore Digital Library
Author	Min Lee Seong Keun Oh
Copyright Year	2008
Description	Author affiliation: Sch. of Electr. & Comput. Eng., Ajou Univ., Seoul (Min Lee; Seong Keun Oh)
Abstract	In this paper, we deal with an optimum per-user power allocation problem in terms of the sum capacity in multiuser multiple input multiple output (MU-MIMO) downlink systems when the minimum mean square error (MMSE) scheme has been used for multiuser preceding. However, MMSE preceding allows some inter-user interference. In this paper, we propose a modified iterative water-filling (MIWF) algorithm with per-iteration power normalization (PIPN) in multiuser MMSE-precoded MIMO systems. In the proposed algorithm, power levels for respectacle users are re-adjusted prior to the consecutive iteration, so that the total transmit power constraint should be satisfied. This normalization can reduce greatly the number of iterations for the iterative water-filling process since the inter-user interference terms at every iteration can be computed more accurately without performance degradation. From computer simulations and complexity analyses, we see that the proposed algorithm has lower complexity but with the same capacity as compared with the original MIWF algorithm.
Starting Page	372
Ending Page	376
File Size	2127654
Page Count	5
File Format	PDF
ISBN	9788955191363
ISSN	17389445
DOI	10.1109/ICACT.2008.4493781
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-02-17
Publisher Place	South Korea
Access Restriction	Subscribed
Rights Holder	ETRI, NIA
Subject Keyword	Iterative algorithms MIMO Signal processing algorithms Downlink Receiving antennas Interference constraints Multiaccess communication Transmitters Transmitting antennas Power engineering computing Modified iterative water-filling Multiuser MIMO MMSE precoding
Content Type	Text
Resource Type	Article

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