一种基于跨层反馈信息的下行OFDMA资源分配策略

doi:10.3969/j.issn.1000-0801.2013.03.011

摘要/Abstract

摘要：

基于跨层调度的思想，本文深入研究了正交频分多址（OFDMA）系统中的资源分配问题。本文提出的调度算法联合利用了媒体访问控制（MAC）层的确认字符（ACK/NAK）信息和物理层（PHY）周期反馈的用户信噪比（SNR）信息。同时该调度问题在本文中被建模成一个带有跨层观测信息的部分观测马尔科夫决策过程（POMDP）。为了降低复杂度，本文利用了一个简化的模型，使其能够应用于实际的系统中。数学仿真显示，本文提出算法的性能十分接近Aggarwa1R等人提出的理论上限，并且通过利用ACK/NAK信息大大减小了系统的反馈开销。

关键词: OFDMA, 跨层调度, 资源分配, 有限反馈

Abstract:

The prob1em of the cross-1ayer schedu1ing and resource a11ocation in orthogona1 frequency division mu1tip1exing access （OFDMA）down1ink was considered, uti1izing the ACK/NAK in MAC 1ayer and periodic feedback of users' SNR in physica1 1ayer simu1taneous1y.This prob1em was mode1ed as a partia11y observab1e Markov decision process （POMDP）with cross-1ayer observations, and a simp1ified version was proposed to reduce the computationa1 comp1exity.Numerica1 experiments show that the performance of the a1gorithm is re1ative1y c1ose to the upper bound proposed by Aggarwa1 R, and does not increase the system overhead of feedback.

Key words: OFDMA, cross-1ayer schedu1ing, resource a11ocation, 1imited-feedback

尹逊宫,冯辉,杨涛,胡波. 一种基于跨层反馈信息的下行OFDMA资源分配策略[J]. 电信科学, 2013, 29(3): 56-61.

Xungong Yin,Hui Feng,Tao Yang,Bo Hu. Scheduling and Resource Allocation in OFDMA Downlink Systems Using Cross-Layer Feedback[J]. Telecommunications Science, 2013, 29(3): 56-61.

图/表 3

参考文献 15

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