Rate Maximization of Decode-and-Forward Relaying Systems with RF Energy Harvesting

Zoran Hadzi-Velkov, Nikola Zlatanov, Trung Q. Duong, Robert Schober

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)


We consider a three-node decode-and-forward (DF) half-duplex relaying system, where the source first harvests RF energy from the relay, and then uses this energy to transmit information to the destination via the relay. We assume that the information transfer and wireless power transfer phases alternate over time in the same frequency band, and their time fraction (TF) may change or be fixed from one transmission epoch (fading state) to the next. For this system, we maximize the achievable average data rate. Thereby, we propose two schemes: (1) jointly optimal power and TF allocation, and (2) optimal power allocation with fixed TF. Due to the small amounts of harvested power at the source, the two schemes achieve similar information rates, but yield significant performance gains compared to a benchmark system with fixed power and fixed TF allocation.
Original languageEnglish
Pages (from-to)2290-2293
Number of pages4
JournalIEEE Communications Letters
Issue number12
Early online date09 Oct 2015
Publication statusPublished - Dec 2015


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