| Chen Dan(陈丹),Ji Hong,Li Xi,Luo Changqing.[J].高技术通讯(英文),2011,17(3):305~310 |
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| Optimal joint relay selection and resource allocation with QoS constraints in multiuser OFDM-based cellular networks |
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| DOI： |
| 中文关键词: |
| 英文关键词: cooperative diversity, relay selection, resource allocation, Lagrangian dual-primal decomposition |
| 基金项目: |
| Author Name | Affiliation | | Chen Dan(陈丹) | | | Ji Hong | | | Li Xi | | | Luo Changqing | |
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| 中文摘要: |
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| 英文摘要: |
| This paper investigates the relay selection and resource allocation problem in multiuser orthogonal frequency division multiplexing (OFDM) based cooperative cellular networks, in which user nodes could relay information for each other using the decode-and-forward (DF) protocol to achieve spatial diversity gain. Specifically, the paper proposes an optimal joint relay selection and resource allocation (ORSRA) algorithm whose objective is to maximize system total achievable data rate with the constraints of each user’s individual quality of service (QoS) requirement and transmission power. Due to being a mixed binary integer programming (MBIP) problem, a novel two-level Lagrangian dual-primal decomposition and subgradient projection approach is proposed to not only select the appropriate cooperative relay nodes, but also allocate subcarries and power optimally. Simulation results demonstrate that our proposed scheme can efficiently enhance overall system data rate and guarantee each user’s QoS requirement. Meanwhile, the fairness among users can be improved dramatically. |
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