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

Bibliography:

Fatma Benkhelifa, Zouheir Rezki, Mohamed-Slim Alouini, On the Low SNR Capacity of Maximum Ratio Combining over Rician Fading Channels with Full Channel State Information, IEEE Wireless Communications Letters, vol.2, no.2, pp.191,194, April 2013.

Authors:

Fatma Benkhelifa, Zouheir Rezki, Mohamed-Slim Alouini

Keywords:

Ergodic capacity, MRC, Rician fading channel, on-o ff signaling.

Year:

2013

Abstract:

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.

ISSN:

2013