Low SNR capacity of double-scattering MIMO channels with transmitter channel knowledge

Authors:
Shi Jin;Matthew R. McKay;Kai-Kit Wong;Xiao Li
Affiliations:
University College London, UK and Department of Electronic and Computer Engineering, Hong Kong University of Science and Technology, Kowloon, Hong Kong;National Mobile Communications Research Laboratory, Southeast University;University College London, UK;Department of Electronic and Computer Engineering, Hong Kong University of Science and Technology, Hong Kong
Venue:
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Year:
2009

Citing 22
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Abstract

This paper investigates the capacity of double-scattering multiple-input multiple-output (MIMO) channels in the low signal to noise ratio (SNR) regime. We first derive analytical expressions for the two key low SNR parameters; namely, the minimum required Eb/N0 and wideband slope, assuming statistical channel state information (CSI) at the transmitter. Based on these results, we investigate the effect of transmit, scatter, and receive correlation. For the case of the double-scattering MIMO keyhole channel, we then analyze the low SNR capacity for different levels of transmit CSI. We show that increased transmit CSI leads to a reduced minimum required Eb/N0.