多用户MIMO-OFDM系统基于QoE效用函数的跨层资源分配

doi:10.3969/j.issn.1000-436x.2014.09.018

摘要/Abstract

摘要：

对多用户MIMO-OFDM系统下行链路的资源分配问题进行了研究。依据实时（RT,real-time）和非实时（NRT，non real-time）业务的不同特点分别设计了QoE效用函数，并提出一种基于RT &NRT QoE效用函数的跨层资源分配算法。该算法利用所设计的效用函数计算用户分得资源所贡献的QoE增量，并根据由QoE增量确定的用户优先级完成时频资源块的分配，进而通过“拟注水”方式对功率分配进行优化。仿真结果表明，该算法相比已有算法在用户平均QoE、实时业务平均分组时延、非实时业务平均分组丢失率以及系统和吞吐量方面的性能均得到了明显改善。

关键词: 多用户, 多入多出正交频分复用, 资源分配, 跨层, 用户感受质量效用函数

Abstract:

Resource allocation problem was investigated for downlink multi-user MIMO-OFDM systems.A QoE (quality of experience) utility function was given according to the characteristics of real-time (RT) and non real-time (NRT) ser-vices,and then a RT & NRT QoE utility function-based cross-layer resource allocation algorithm was proposed.The al-gorithm firstly used the designed utility function to calculate the delta QoE,which was offered by users got resource.Secondly,it classified users according to their delta QoE and then allocated time-frequency blocks.Thirdly,it optimized the power allocation result by implementing pseudo water flooding power allocation.Simulation results show that com-pared with the existing algorithm,the proposed algorithm is better in the user average QoE,average packet delay to real time services,average packet lost rate to non real time services as well as sum throughput of system.

Key words: multi-user, MIMO-OFDM, resource allocation, cross-layer, QoE utility function

王大鸣,陈松,崔维嘉,王强. 多用户MIMO-OFDM系统基于QoE效用函数的跨层资源分配[J]. 通信学报, 2014, 35(9): 175-183.

Da-ming WANG,Song CHEN,Wei-jia CUI,Qiang WANG. QoE utility function-based cross-layer resource allocation in multi-user MIMO-OFDM systems[J]. Journal on Communications, 2014, 35(9): 175-183.

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MOS区间	用户感受
1,2)	几乎所有用户不满意
2,3)	多数用户不满意
3,4)	部分用户不满意
4,5]	几乎所有用户满意

T_r/ms	R
25	92
75	90
125	86
175	80
225	74
275	68

T₁	MOS
0.05	4.38
0.15	4.34
0.25	4.22
0.35	4.02
0.45	3.78
0.55	3.50

类型	数据分组大小/kB	平均到达数/(个·s^?1)	业务速率/(kB·s^?1)
VoIP	0.512	20	10
Video	1	20	20