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On the Low SNR Capacity of Maximum Ratio Combining over Rician Fading Channels with Full Channel State Information

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3 Author(s)
Benkhelifa, F. ; Electr. & Math. Sci. & Eng. (CEMSE) Div., King Abdullah Univ. of Sci. & Technol. (KAUST), Thuwal, Saudi Arabia ; Rezki, Z. ; Alouini, M.-S.

In this letter, we study the ergodic capacity of a maximum ratio combining (MRC) Rician fading channel with full channel state information (CSI) at the transmitter and at the receiver. We focus on the low Signal-to-Noise Ratio (SNR) regime and we show that the capacity scales as LΩ/K+L SNR×log(1/SNR), where Ω is the expected channel gain per branch, K is the Rician fading factor, and L is the number of diversity branches. We show that one-bit CSI feedback at the transmitter is enough to achieve this capacity using an on-off power control scheme. Our framework can be seen as a generalization of recently established results regarding the fading-channels capacity characterization in the low-SNR regime.

Published in:

Wireless Communications Letters, IEEE  (Volume:2 ,  Issue: 2 )

Date of Publication:

April 2013

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