| Tang Mingwei(唐名威)②,Wang Xiaoxiang.[J].高技术通讯(英文),2011,17(4):360~365 |
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| Joint subcarrier and power allocation with threshold in cooperative multiuser networks① |
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| 中文关键词: |
| 英文关键词: cooperative communication, orthogonal frequency division multiplexing access (OFDMA), resource allocation, threshold |
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| Author Name | Affiliation | | Tang Mingwei(唐名威)② | | | Wang Xiaoxiang | |
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| 英文摘要: |
| In this paper, we investigate a resource allocation issue in OFDMA-based decode-and-forward cooperative multiuser networks and propose joint subcarrier and power allocation schemes. The optimal solution of this combinable allocation shows high computational complexity, so we allocate subcarriers and power separately. At firstly, we distribute subcarriers to relays and users under the assumption of equal power distribution. Here, we propose an equal capacity increment (ECI) allocation strategy to achieve tradeoff between total throughput and fairness. To further improve the system performance, we introduce threshold into ECI strategy, named ECI strategy with threshold (ECI-T), where subcarriers with bad performance are prevented from transmitting. Subsequently, a water-filling method is adopted to distribute the power to cooperative links in order to fully utilize the limited power. Simulation results show that system performance of the proposed schemes is significantly enhanced compared with an existing resource allocation scheme. Besides, the resource allocation schemes with the water-filling method notably outperform schemes with equal power allocation. |
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