| 引用本文: | 刘永进,陈西宏,赵宇.OFDM/OQAM系统信道估计改进方法.[J].国防科技大学学报,2021,43(1):72-78.[点击复制] |
| LIU Yongjin,CHEN Xihong,ZHAO Yu.Improved channel estimation method for OFDM/OQAM system[J].Journal of National University of Defense Technology,2021,43(1):72-78[点击复制] |
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| OFDM/OQAM系统信道估计改进方法 |
| 刘永进,陈西宏,赵宇 |
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(空军工程大学 防空反导学院, 陕西 西安 710051)
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| 摘要: |
| 在基于导频的信道估计方法中,伪导频的功率决定了该信道估计方法的性能。为了提高OFDM/OQAM系统的信道估计精度,提高频谱效率,提出一种基于改进导频结构的信道估计方法。在原有导频结构的基础上,对其中功率最高的导频结构进行改进,并给出对应的信道估计方法。由于缺乏足够的接收信号先验知识,无法直接对信道进行估计。为了解决这一问题,提出一种预判决方法对接收信号进行估计, 并通过迭代减小预判决引入的误差,提高估计精度。仿真结果表明,本文提出的导频结构具有更高的频谱效率和更好的信道估计性能。 |
| 关键词: 信道估计 频谱效率 伪导频功率 预判决 |
| DOI：10.11887/j.cn.202101010 |
| 投稿日期：2019-09-09 |
| 基金项目:国家自然科学基金资助项目(61671468) |
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| Improved channel estimation method for OFDM/OQAM system |
| LIU Yongjin, CHEN Xihong, ZHAO Yu |
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(Air and Missile Defense College, Air Force Engineering University, Xi′an 710051, China)
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| Abstract: |
| In the OFDM/OQAM system, higher pseudo pilot power means more accurate channel estimation. According to this principle, an effective channel estimation method based on the improved preamble structure with higher pseudo pilot power was proposed. On the basis of the previous preamble structure, the preamble structure with highest power was improved and its channel estimation method was proposed. Because of the lack of enough prior knowledge of receipt signal, the channel is unable to be estimated. The pre-decision method was utilized to solve this problem. The error caused by the pre-decision was reduced through iteration, thus the estimation accuracy was improved. Simulation results prove that the proposed preamble structure shows better channel estimation performance and higher spectral efficiency. |
| Keywords: channel estimation spectral efficiency pseudo pilot power pre-decision |
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