NDLI: Optimal Feedback Bits Allocation for Two-Cell Massive MIMO Downlink

Content Provider	IEEE Xplore Digital Library
Author	Guozhen Xu Wei Jiang An Liu Haige Xiang Wu Luo
Copyright Year	2013
Description	Author affiliation: State Key Lab. of Adv. Opt. Commun. Syst. & Networks, Peking Univ., Beijing, China (Guozhen Xu; Wei Jiang; Haige Xiang; Wu Luo) \|\| Dept. of Electr. & Comput. Eng., Hong Kong Univ. of Sci. & Technol., Hong Kong, China (An Liu)
Abstract	Massive multiple-input multiple-output (MIMO) is an attractive solution to achieve high data rate and tackle interference. In this paper, we study the downlink of a two-cell massive MIMO system employing coordinated zero-forcing beamforming with limited feedback, where each base station (BS) acquires both the direct link channel state information (DCSI) and the cross link CSI (CCSI) from the users through a limited feedback link. The DCSI is used to support multi-user MIMO transmission (control intra-cell interference) at each BS and the CCSI is used to control the inter- cell interference. Since the total number of feedback bits at each user is fixed, there is a tradeoff between the quantization errors of the DCSI and CCSI. We consider the allocation of the feedback bits over the DCSI and CCSI to maximize the sum-rate of the system. We obtain closed-form solution for the asymptotically optimal feedback bits allocation as the number of antennas per BS goes to infinity. The solution reveals insights on how the key system parameters such as path gains, transmit powers and the number of antennas/users affect the optimal feedback bits allocation. Numerical results validate our theoretical analysis.
Starting Page	1
Ending Page	5
File Size	299360
Page Count	5
File Format	PDF
ISBN	9781467361873
ISSN	10903038
DOI	10.1109/VTCFall.2013.6692330
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-09-02
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Interference MIMO Array signal processing Bit rate Signal to noise ratio Vectors Downlink
Content Type	Text
Resource Type	Article

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