| 通用滤波多载波通信系统中干扰抑制均衡算法 |
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| 引用本文： | 路娟,何世文,黄永明,杨绿溪. 通用滤波多载波通信系统中干扰抑制均衡算法[J]. 信号处理, 2018, 34(5): 549-557. DOI: 10.16798/j.issn.1003-0530.2018.05.006 |
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| 作者姓名： | 路娟 何世文 黄永明 杨绿溪 |
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| 作者单位： | 东南大学信息科学与工程学院 |
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| 基金项目： | 国家自然科学基金(61471120,61422105,61531011) |
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| 摘 要： | 作为5G多载波技术强有力的候选对象，通用滤波多载波利用子带滤波技术抑制带外功率泄露，进而降低同步要求和获得更高的频谱效率。本文首先针对通用滤波多载波在慢时变多径信道下的性能进行了分析和研究；其次为消除多径信道所带来的干扰，提出了适用于该多载波系统的信道估计方案，该方案设计了具有重复样式的导频结构进行信道估计，复杂度低；最后针对通用滤波多载波在多径信道下容易遭受符号间干扰的问题，提出了基于干扰消除的Zero-Forcing均衡算法和基于迭代干扰消除的均衡算法，两种算法均能够在消除ISI的基础上进一步地消除ICI和IBI。仿真结果表明，本文提出的信道估计和均衡算法能有效消除通用滤波多载波技术在多径信道下所经受的ISI、ICI和IBI。
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| 关 键 词： | 5G多载波 通用滤波多载波 信道估计 信道均衡 |
| 收稿时间： | 2018-01-02 |
Equalization Algorithm of Interference Suppression for Universal-filtered Multicarrier System |
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| Affiliation: | School of Information Science and Engineering, Southeast University, Nanjing |
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| Abstract: | As a strong candidate for 5G multi-carrier technology, Universal-filtered Multi-carrier(UFMC) can suppress out-of-band power leakage through the use of sub-band filters, reducing synchronization requirements and achieving higher spectral efficiency. However, in order to improve the transmission efficiency no guard interval is inserted between adjacent symbols in UFMC system, making the receiver vulnerable to interference caused by multipath channel. In this article, the performance of UFMC under slow time-varying multipath channel was analyzed firstly. Secondly, in order to eliminate the interference caused by multipath channels, a new channel estimation scheme was proposed. This scheme designed a special pilot with repetitive patterns for channel estimation with low complexity. Finally, two new equalization algorithms were proposed to eliminate ISI、ICI and IBI caused by multipath channel, which were Zero-Forcing equalization algorithm based on interference cancellation and equalization algorithm based on Iterative Interference Cancellation. The simulation results show that the schemes proposed for channel estimation and equalization in this paper can effectively eliminate ISI、ICI and IBI suffered by UFMC system under multipath channel. |
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