naa a22 4500 510791727 CHVBK 20180411083322.0 cr unu---uuuuu 180411e20130801xx s 000 0 eng 10.1007/s11277-012-0894-x doi (NATIONALLICENCE)springer-10.1007/s11277-012-0894-x QoS-Driven Jointly Optimal Subcarrier Pairing and Power Allocation for Decode-and-Forward OFDM Relay Systems [Elektronische Daten] [Gaofei Huang, Liping Luo, Guangchi Zhang, Ping Yang, Dong Tang, Jiayin Qin] In this paper, we investigate the quality-of-service (QoS) driven subcarrier pairing and power allocation for two-hop decode-and-forward (DF) OFDM relay systems. By integrating the concept of effective capacity, our goal is to maximize the system throughput subject to a given delay-QoS constraint. Based on whether the destination can receive the signal transmitted by the source, we consider two scenarios, i.e. OFDM DF relay systems without diversity and OFDM DF relay systems with diversity, respectively. For OFDM DF relay systems without diversity, we demonstrate that the jointly optimal subcarrier pairing and power allocation can be implemented with two separate steps. For OFDM DF relay systems with diversity, we propose an iterative algorithm to achieve jointly optimal subcarrier pairing and power allocation. Furthermore, we find that the analytical results show different conclusions for the two types of OFDM relay systems. For OFDM relay systems without diversity, the optimal power allocation depend on not only the channel quality of subcarriers but also the delay QoS constraints, while the optimal subcarrier pairing just depends on the channel quality of subcarriers. For OFDM relay systems with diversity, both the optimal subcarrier pairing and power allocation depend on the channel quality of subcarriers and the delay QoS constraints. Simulation results show that our proposed scheme offers a superior performance over the existing schemes. Springer Science+Business Media New York, 2012 OFDM nationallicence Relay nationallicence Subcarrier pairing nationallicence Power allocation nationallicence Effective capacity nationallicence QoS nationallicence Convex optimization nationallicence Huang Gaofei School of Mechanical and Electronic Engineering, Guangzhou University, 510006, Guangzhou, Guangdong, China aut Luo Liping School of Information Science and Engineering, Guangxi University for Nationalities, 530006, Nanning, Guangxi, China aut Zhang Guangchi School of Information Science, Guangdong University, 510006, Guangzhou, Guangdong, China aut Yang Ping School of Information Science and Technology, Sun Yat-Sen University, 510006, Guangzhou, Guangdong, China aut Tang Dong School of Mechanical and Electronic Engineering, Guangzhou University, 510006, Guangzhou, Guangdong, China aut Qin Jiayin School of Information Science and Technology, Sun Yat-Sen University, 510006, Guangzhou, Guangdong, China aut Wireless Personal Communications Springer US; http://www.springer-ny.com 71/3(2013-08-01), 1597-1618 0929-6212 71:3<1597 2013 71 11277 https://doi.org/10.1007/s11277-012-0894-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11277-012-0894-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Huang Gaofei School of Mechanical and Electronic Engineering, Guangzhou University, 510006, Guangzhou, Guangdong, China aut NATIONALLICENCE 700 1- Luo Liping School of Information Science and Engineering, Guangxi University for Nationalities, 530006, Nanning, Guangxi, China aut NATIONALLICENCE 700 1- Zhang Guangchi School of Information Science, Guangdong University, 510006, Guangzhou, Guangdong, China aut NATIONALLICENCE 700 1- Yang Ping School of Information Science and Technology, Sun Yat-Sen University, 510006, Guangzhou, Guangdong, China aut NATIONALLICENCE 700 1- Tang Dong School of Mechanical and Electronic Engineering, Guangzhou University, 510006, Guangzhou, Guangdong, China aut NATIONALLICENCE 700 1- Qin Jiayin School of Information Science and Technology, Sun Yat-Sen University, 510006, Guangzhou, Guangdong, China aut NATIONALLICENCE 773 0- Wireless Personal Communications Springer US; http://www.springer-ny.com 71/3(2013-08-01), 1597-1618 0929-6212 71:3<1597 2013 71 11277 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer