Power Adaptation Based on Truncated Channel Inversion for Hybrid FSO/RF Transmission With Adaptive Combining

Tamer Rakia, Hong-Chuan Yang, Fayez Gebali, Mohamed-Slim Alouini

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Hybrid free-space optical (FSO)/radio-frequency (RF) systems have emerged as a promising solution for high-data-rate wireless communications. In this paper, we consider power adaptation strategies based on truncated channel inversion for the hybrid FSO/RF system employing adaptive combining. Specifically, we adaptively set the RF link transmission power when FSO link quality is unacceptable to ensure constant combined signal-to-noise ratio (SNR) at the receiver. Two adaptation strategies are proposed. One strategy depends on the received RF SNR, whereas the other one depends on the combined SNR of both links. Analytical expressions for the outage probability of the hybrid system with and without power adaptation are obtained. Numerical examples show that the hybrid FSO/RF system with power adaptation achieves a considerable outage performance improvement over the conventional system.
Original languageEnglish (US)
Pages (from-to)1-12
Number of pages12
JournalIEEE Photonics Journal
Volume7
Issue number4
DOIs
StatePublished - Jul 23 2015

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