OFDMA中继系统中基于QoS保证的资源分配算法
PDF下载 (632)赵翠茹,李有明.OFDMA中继系统中基于QoS保证的资源分配算法[J].宁波大学学报(理工版),2012,25(04):20-24.DOI:
ZHAO Cui-ru,LI You-ming.QoS Aware Resource Allocation Algorithm in OFDMA Relay Systems[J].Journal of Ningbo University(Natural Science & Engineering Edition),2012,25(04):20-24.DOI:
| Title: | QoS Aware Resource Allocation Algorithm in OFDMA Relay Systems |
| 作者: | 赵翠茹, 李有明 |
| Author(s): | ZHAO Cui-ru, LI You-ming |
| 关键词: | 中继通信技术; 中继选择; 正交频分多址接入; 服务质量; 动态资源分配 |
| Keywords: | relay communications technology; relay selection; OFDMA; QoS; dynamic resource allocation |
| 分类号: | TN92 |
| 文献标识码: | A |
| 摘要: | 研究了OFDMA中继下行链路通信系统中的动态资源分配问题, 提出了一种可以保证用户最低QoS需求的资源分配算法. 首先在简化资源优化问题的过程中, 采用等功率分配方法以降低算法复杂度, 然后通过拉格朗日松弛优化方法推导出了子载波分配和中继选择最优解, 并在此基础上引入用户速率权衡因子, 根据速率权衡因子越大的用户, 越具有选择子载波和中继的优先权这一准则进行子载波分配和中继选择. 仿真结果表明: 新算法能够获得较高的系统容量, 同时也能很好地保证不同用户的最低速率需求. |
| Abstract: | The problem of dynamic resource allocation for downlink orthogonal frequency-division multiple-access (OFDMA) relay systems is studied, and a new resource allocation with quality of service (QoS) constraints is proposed in this paper. Firstly, in order to reduce the complexity, the algorithm uses equal power allocation in the process of simplifying resources optimization problem. Then, the subcarrier allocation and relay selection scheme is derived through Lagrangian relaxation optimization method, based on which each user is assigned a weight factor. The users with higher weight are given higher priority to select their best subcarriers and relays. The simulation results demonstrate that the algorithm can not only obtain high system capacity, but also guarantee the minimum rate requirements of different users. |
| 参考文献 /References: | [1] Rappaport T S, Annamalai A, Buehrer R M, et al. Wireless communications: Past events and a future perspective[J]. IEEE Communication Magazine, 2002, 40: 148-161. [2] Genc V, Murphy S, Yu Y, et al. IEEE 802.16j relay-based wireless access networks: A novel view[J]. IEEE Wireless Comm, 2008, 15:56-65. [3] Pabst R, Walke B, Schultz D, et al. Relay-based deployment concepts for wireless and mobile broadband radio[J]. IEEE Comm Magazine, 2004, 42(9):80-89. [4] Ergen M, Coleri S, Varaiya P. QoS aware adaptive resource allocation techniques for fair scheduling in OFDMA based broadband wireless access systems[J]. IEEE Trans Broadcasting, 2003, 49(4):362-370. [5] Shen Z, Andrews J G, Evans B L. Adaptive resource allocation in multiuser OFDM systems with proportional rate constraints[J]. IEEE Trans Wireless Comm, 2005, 4(6):2726-2737. [6] Pischella M, Belfiore J C. Resource allocation for QoS- aware OFDMA using distributed network coordination[J]. IEEE Trans on Vehicular Technology, 2009, 58(4):1766- 1775. [7] Huang Lei, Rong Mengtian, Wang Lan, et al. Resource allocation for OFDMA based relay enhanced cellular networks[C]. VTC April IEEE 65th, 2007:3160-3164. [8] You Lei, Song Mei, Song Junde. Uplink resource allocation in OFDMA relay-assisted cellular network with fairness[C]. IET Conference on Mobile and Sensor Networks, 2007:24-27. |
| 备注/Memo: | 收稿日期: 2012-07-30. 基金项目: 国家自然科学基金（60772126, 61071119）; 浙江省自然科学基金（Y1091155）; 浙江省科技厅科研项目（2009C34001）. 第一作者: 赵翠茹（1989－）, 女, 山东菏泽人, 在读硕士研究生, 主要研究方向: 宽带资源分配. E-mail: pengpengyuagt@126.com *通讯作者: 李有明（1963－）, 男, 陕西扶风人, 博导/教授, 主要研究方向: 宽带接入技术. E-mail: liyouming@nbu.edu.cn 宁波大学学报（理工版）网址：http://journallg.nbu.edu.cn/ |
