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

Author

Benkhelifa, Fouad ; Rezki, Zouheir ; Alouini, Mohamed-Slim

Author_Institution

Electr. & Math. Sci. & Eng. (CEMSE) Div., King Abdullah Univ. of Sci. & Technol. (KAUST), Thuwal, Saudi Arabia

Volume

2

Issue

2

fYear

2013

fDate

Apr-13

Firstpage

191

Lastpage

194

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.

Keywords

Rician channels; radio receivers; radio transmitters; CSI feedback; Rician fading channel; SNR regime; capacity scale; ergodic capacity; fading-channels capacity characterization; full channel state information; maximum ratio combining; on-off power control scheme; receiver; signal-to-noise ratio regime; transmitter; Fading; Receivers; Rician channels; Signal to noise ratio; Transmitters; Vectors; Wireless communication; Ergodic capacity; MRC; Rician fading channel; on-off signaling;

fLanguage

English

Journal_Title

Wireless Communications Letters, IEEE

Publisher

ieee

ISSN

2162-2337

Type

jour

DOI

10.1109/WCL.2013.011713.120821

Filename

6415959