NDLI: A vector-perturbation technique for near-capacity multiantenna multiuser communication-part I: channel inversion and regularization

Content Provider	IEEE Xplore Digital Library
Author	Peel, C.B. Hochwald, B.M. Swindlehurst, A.L.
Copyright Year	1972
Abstract	Recent theoretical results describing the sum capacity when using multiple antennas to communicate with multiple users in a known rich scattering environment have not yet been followed with practical transmission schemes that achieve this capacity. We introduce a simple encoding algorithm that achieves near-capacity at sum rates of tens of bits/channel use. The algorithm is a variation on channel inversion that regularizes the inverse and uses a "sphere encoder" to perturb the data to reduce the power of the transmitted signal. This work is comprised of two parts. In this first part, we show that while the sum capacity grows linearly with the minimum of the number of antennas and users, the sum rate of channel inversion does not. This poor performance is due to the large spread in the singular values of the channel matrix. We introduce regularization to improve the condition of the inverse and maximize the signal-to-interference-plus-noise ratio at the receivers. Regularization enables linear growth and works especially well at low signal-to-noise ratios (SNRs), but as we show in the second part, an additional step is needed to achieve near-capacity performance at all SNRs.
Starting Page	195
Ending Page	202
Page Count	8
File Size	411250
File Format	PDF
ISSN	00906778
Volume Number	53
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-01-01
Publisher Place	U.S.A.
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	MIMO Receiving antennas Communication system control Transmitters Wireless LAN DSL Telephony Switches Interference channels Transmitting antennas spatial equalization Broadcast channel channel inversion multiple-antenna multiple-user wireless multiple-input multiple-output (MIMO) regularization
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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