NDLI: Adjustable phase shift pilots for sparse massive MIMO-OFDM channels

Content Provider	IEEE Xplore Digital Library
Author	Li You Xiqi Gao Swindlehurst, A.L. Wen Zhong
Copyright Year	2015
Description	Author affiliation: Center for Pervasive Commun. & Comput. (CPCC), Univ. of California, Irvine, Irvine, CA, USA (Swindlehurst, A.L.) \|\| Nat. Mobile Commun. Res. Lab., Southeast Univ., Nanjing, China (Li You; Xiqi Gao; Wen Zhong)
Abstract	We propose adjustable phase shift pilots (APSPs) for wideband massive multiple-input multiple-output (MIMO) systems employing orthogonal frequency division multiplexing (OFDM) to reduce the pilot overhead. Based on a physically motivated channel model, we first establish a relationship between channel space-frequency correlations and the channel power angle-delay (AD) spectrum in the massive antenna array regime, which reveals the channel sparsity in massive MIMO-OFDM. With this channel model, we then investigate channel estimation (CE) for massive MIMO-OFDM with APSPs. We show that CE performance in terms of sum mean square error can be minimized if the user terminals' channel power distributions in the AD domain are non-overlapping with proper phase shift scheduling. The Simulation results demonstrate that the proposed APSP approach can provide substantial performance gains in terms of achievable spectral efficiency over the conventional phase shift orthogonal pilot approach in typical high mobility scenarios.
Starting Page	206
Ending Page	210
File Size	327834
Page Count	5
File Format	PDF
e-ISBN	9781479919314
DOI	10.1109/SPAWC.2015.7227029
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-06-28
Publisher Place	Sweden
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	OFDM Wireless communication MIMO Delays Channel estimation Channel models Antennas
Content Type	Text
Resource Type	Article

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