Open AccessJoint resource allocation with subcarrier pairing in cooperative OFDM DF multi‐relay networks
Author(s) -
Li Xueyi,
Zhang Qi,
Zhang Guangchi,
Cui Miao,
Yang Liang,
Qin Jiayin
Publication year - 2015
Publication title -
iet communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.355
H-Index - 62
eISSN - 1751-8636
pISSN - 1751-8628
DOI - 10.1049/iet-com.2014.0346
Subject(s) - relay , subcarrier , pairing , orthogonal frequency division multiplexing , joint (building) , computer science , computer network , resource allocation , telecommunications , engineering , physics , channel (broadcasting) , architectural engineering , power (physics) , superconductivity , quantum mechanics
For conventional subcarrier pairing scheme in cooperative orthogonal frequency division multiplexing decode‐and‐forward multi‐relay networks, to avoid interference, each subcarrier pair (SP) is assigned to a single relay. Over a specific subcarrier, the destination receives signals transmitted from the relay. In this study, to better exploit the degrees of spatial freedom, the authors propose to assign each SP to multiple relays. Thus, over a specific subcarrier, the destination receives signals transmitted from multiple relays. Under the total network power constraint, to maximise the sum transmission rate, they propose a joint resource allocation scheme, in which they jointly optimised the four types of resources: assisting relays selection, transmission mode selection, subcarrier pairing and power allocation. They further propose a suboptimal algorithm which can significantly reduce the computational complexity of the aforementioned optimal allocation scheme with sacrificing little on the performance. It is shown from simulation results that the author's proposed schemes have significant performance improvement over the resource allocation schemes in the literature.