一种低复杂度基于公平性的MIMO-OFDMA资源分配方案

杜娜; 顾品标; 闵锐; 曹宁

doi:10.3724/SP.J.1146.2008.00728

一种低复杂度基于公平性的MIMO-OFDMA资源分配方案

doi: 10.3724/SP.J.1146.2008.00728

计量
- 文章访问数: 3709
- HTML全文浏览量: 93
- PDF下载量: 735
- 被引次数: 0
出版历程
- 收稿日期: 2008-06-03
- 修回日期: 2010-01-18
- 刊出日期: 2010-04-19

A Low Complexity Resource Allocation Scheme with Proportional Fairness for MIMO-OFDMA System

摘要

摘要: 该文针对MIMO-OFDMA下行链路系统，考虑在总功率和BER 以及用户数据速率成比例的约束下，以获取整个系统吞吐量极大化为准则，提出一种基于成比例公平性约束的资源分配方案。新的方案基于MIMO信道状态信息，利用特征子信道来确定子载波和功率分配，充分利用了空间域，频域以及多用户分集提高系统的频谱效率。在子载波分配时，松弛成比例约束条件，使用户数据速率近似地成比例于每个用户分配的子载波数，推导出一种线性的不需要迭代的低复杂度的功率分配方案。仿真和分析表明，整个方案在保证系统吞吐量的前提下，取得了用户间良好的速率公平性，同时又具有较低的计算复杂度。
- 无线通信; MIMO-OFDMA; 资源分配; 公平性
Abstract: This paper presents a new scheme based on proportional fairness for MIMO-OFDM downlink resource allocation to maximize the sum of user data rates, subject to constraints on total power, bit error rate, and proportionality among user data rates. This new scheme embraces the ability to simultaneously exploit space, frequency and multi-user diversity to improve spectrum efficiency. Based on MIMO channel state information, eigen-channels are intelligently used to determine subcarrier allocation and power allocation, which forms the foundation of the new scheme. A linear non-iterative power allocation method with low complexity is deduced that is made by the relaxation of strict user rate proportionality constraints. Simulation results show that this new adaptive allocation scheme can achieve good tradeoff between capacity and fairness, while requiring significantly less computation.

HTML全文

参考文献(1)

Wong K, Cheng R, and Letaief K, et al.. Adaptive antennasat the mobile and base stations in an OFDM/TDMAsystem[J].IEEE Transactions on Communications.2001,49(1):195-206[2]Stuber G L, Barry J R, and Mclaughlin S W, et al..Broadband MIMO-OFDM wireless communications[J].Proceedings of the IEEE.2004, 92(2):271-294[3]Hui J and Zhou Y. Enchanced rate adaptive resourceallocation scheme in downlink OFDMA system[C]. IEEEVTC2006-Spring, Melbourne, Australia, 2006, 5: 2464-2468.[4]Pan C K, Cai Y M, and Xu Y Y. Adaptive subcarrier andpower allocation for multiuser MIMO-OFDM systems[C].ICC2005, Seoul, 2005, 4: 2631-2635.[5]Zhang Y J and Letaief K B. An efficient resource-allocationscheme for spatial multiuser access in MIMO/OFDMsystems[J].IEEE Transactions on Communications.2005,53(1):107-116[6]Shen Z, Andrews J G, and Evans B L. Optimal powerallocation in multiuser OFDM systems[C]. IEEE Globalcommunications conference, San Francisco, 2003, 1: 337-341.[7]Brah F.[J].Louveaux J, and Vandendorpe L. Proportional fairpower allocation for OFDM-CDM systems infrequency-selective fading channel[C]. IEEE SPAWC06,Cannes.2006,:-[8]Sann M M and Iwao S. Resource allocation scheme in MIMOOFDMAsystem for users different data throughputrequirements[C]. IEEE WCNC07, Hong Kong, 2007:1706-1710.[9]Wong C Y, Cheng R S, and Lataief K B, et al.. MultiuserOFDM system with adaptive subcarrier, bit, and powerallocation[J].IEEE Journal on Selected AreasCommunications.1999, 17(10):1747-1758[10]Jang J and Lee K B. Transmit power adaptation formultiuser OFDM systems[J].IEEE Journal on Selected AreasCommunication.2003, 21(2):171-178[11]Yin H and Liu H. An efficient multiuser loading algorithm forOFDM-based broadband wireless systems[C]. IEEE GlobalTelecommunications Conference, San Francisco, 2000, 1:103-107.[12]Rhee W and Cioffi J M. Increase in capacity of multiuserOFDM system using dynamic subchannel allocation[C].IEEE Vehicular Technology Conference, Tokyo, 2000, 2:1085-1089.[13]Shen Z, Andrewss J G, and Evans B L. Adaptive resourceallocation in multiuser OFDM systems with proportional rateconstraints[J]. IEEE Transactions on WirelessCommunications, 2005, 4(6): 2726-2737.[14]Xu J, Kim J, and Paik W, et al.. Adaptive resource allocationalgorithm with fairness for MIMO-OFDM system[C]. IEEEVTC2006-Spring, Melbourne, 2006, 4: 1585-1589.[15]Seong T C and Goldsmith A J. Degrees of freedom inadaptive modulation: A unified wiew[J].IEEE Transactionson Communications.2001, 49(9):1561-1571

施引文献

资源附件(0)

访问统计