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Low-SNR capacity of multiple-antenna systems with statistical channel-state information

Jin, S; McKay, MR; Wong, KK; Li, X; (2010) Low-SNR capacity of multiple-antenna systems with statistical channel-state information. IEEE Transactions on Vehicular Technology , 59 (6) pp. 2874-2884. 10.1109/TVT.2010.2048047.

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Abstract

This paper investigates the capacity of double-scattering and Rician fading multiple-inputmultiple-output (MIMO) channels in the low signal-to-noise ratio (SNR) regime. We first derive analytical expressions for the two key low-SNR parametersthe minimum required $E-{b}/N-{0}$ for reliable communications and the wideband slopeassuming statistical channelstate information (CSI) at the transmitter. Based on these results, we study the effects of transmit, scatter, and receive correlation, as well as the Rician $K$ -factor. For double-scattering MIMO channels, we find that the minimum required $E-{b}/N-{0}$ improves with increasing transmit-side correlation and is independent of the scatter and receive correlation, whereas the wideband slope degrades with increasing the scatter and receive correlation and is independent of the transmit-side correlation. For Rician MIMO channels, we show that increasing the Rician $K$- factor leads to an improvement in the minimum required $E-{b}/N-{0} $ while degrading the wideband slope. We also analyze the low-SNR capacity for different levels of transmit CSI for special cases of both channels. Our results demonstrate that the additional beamforming gain due to more accurate CSI leads to a reduced minimum required $E-{b}/N-{0} $ but does not yield improvements in the wideband slope. © 2006 IEEE.

Type: Article
Title: Low-SNR capacity of multiple-antenna systems with statistical channel-state information
DOI: 10.1109/TVT.2010.2048047
UCL classification: UCL > School of BEAMS > Faculty of Engineering Science
UCL > School of BEAMS > Faculty of Engineering Science > Electronic and Electrical Engineering
URI: http://discovery.ucl.ac.uk/id/eprint/1323757
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