何怡刚,隋永波,Farhan Ali,黄 源,程彤彤,宁署光.自适应 OFDM 系统的时域信道预测研究[J].电子测量与仪器学报,2021,35(5):100-110 |
自适应 OFDM 系统的时域信道预测研究 |
Research of the time-domain channel prediction for adaptive OFDM systems |
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DOI: |
中文关键词: 信道预测 OFDM 系统 递归量化分析 回声状态网络 |
英文关键词:channel prediction OFDM system recurrence quantification analysis echo state network |
基金项目:国家自然科学基金(51977153,51977161,51577046)、国家自然科学基金重点项目(51637004)、国家重点研发计划“重大科学仪器设备开发”项目(2016YFF0102200)、装备预先研究重点项目(41402040301)资助 |
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中文摘要: |
针对自适应 OFDM 系统,提出了一种新型时域信道预测策略。 该策略利用递归量化分析方法,量化并估计信道脉冲响
应中每个时延抽头的局部可预测性,然后利用每个时延抽头的局部可预测性筛选出信道脉冲响应中重要的时延抽头;最后,利
用基于联合回声状态网络的信道预测器实现各个重要时延抽头的信道预测。 在仿真部分,利用基于 IEEE802. 11ah 协议的
OFDM 系统来评估系统的性能。 仿真结果表明,通过递归量化分析,可以准确地筛选出信道脉冲响应中重要的时延抽头。 除此
之外,联合回声状态网络可以产生稀疏的输出权值;而且,由于具有 oracle 属性,提出的联合回声状态网络在基本的回声状态网
络的基础上有 91. 57%的预测性能提升。 |
英文摘要: |
In this paper, a novel time-domain channel prediction technique for adaptive OFDM systems is introduced. The novel timedomain channel prediction technique utilizes the RQA to quantify and estimate the local predictability of each time-delay tap in the
channel impulse response, and then based on the local predictability of each delay tap, we select those significant time-delay taps in the
channel impulse response; finally, the joint echo state network ( JESN) is utilized to predict the channel state information in each
significant time-delay tap. In the simulation part, the OFDM system based on the IEEE802. 11ah standard to evaluate the performance.
The simulation results show that by the TSS-RQA, those significant time-delay taps in the channel impulse response are accurately
selected. In addition, the JESN produces the sparse output weight matrix. Due to the oracle property, the improved prediction
performance of the JESN is approximate to 91. 75%, compared to the basic echo state network. |
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