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论文:2017,Vol:35,Issue(3):393-400 |
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引用本文： |
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高翔, 李勇, 包建荣. 高速卫星两级并行CMA-LMS自适应均衡[J]. 西北工业大学学报 |
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Gao Xiang, Li Yong, Bao Jianrong. Two Stage Parallel CMA-LMS Adaptive Equalization in High Speed Satellites[J]. Northwestern polytechnical university |
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| 高速卫星两级并行CMA-LMS自适应均衡 |
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| 高翔1, 李勇1, 包建荣2 |
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1. 西北工业大学 电子信息学院, 陕西 西安 710072;
2. 杭州电子科技大学 信息工程学院, 浙江 杭州 310018 |
| 摘要: |
| 为了克服高速宽带卫星传输非线性群时延信道等导致的信号传输码间干扰问题，提出了一种收敛快且稳态误差小的部分并行两级双模结构常模-最小均方（CMA-LMS）级联自适应均衡算法。该算法利用CMA及LMS算法，建立了两极双模盲-非盲混合均衡，并在频域采用了快速傅里叶变换（FFT）的快速部分并行滤波结构，以少量训练字占用微小带宽的代价，实现了高速并行高速宽带卫星传输非线性群时延信道均衡，提高了信号频带利用率，具有较好应用价值。仿真表明了该算法具有接近理想均衡滤波的较好性能。此外，还设计了采用部分并行结构的算法框架，并分析了其复杂度，使其可在资源有限约束下，实现高速可靠卫星非线性信道的频域均衡。 |
| 关键词:
卫星通信
CMA盲均衡
BLMS均衡
群时延
代价函数
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| Two Stage Parallel CMA-LMS Adaptive Equalization in High Speed Satellites |
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| Gao Xiang1, Li Yong1, Bao Jianrong2 |
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1. School of Electronic and Information, Northwestern Polytechnical University, Xi'an 710072, China;
2. School of Communication Engineering, Hangzhou Dianzi University, Hangzhou 310018, China |
| Abstract: |
| In order to overcome the problem of inter-symbol interference in signal transmission caused by the effect of non-linear group delay in high speed broadband satellite transmissions, a partially parallel two-stage two-mode CMA-LMS adaptive equalization with fast convergence speed and small stable error is proposed in this paper. By the CMA and the LMS algorithm, a two-stage hybrid two mode blind-or-not frequency domain equalization is set up. In addition, a FFT based fast partially parallel filter structure is adopted to implement the nonlinear group delay equalization in high speed broadband satellite transmission channel at the cost of trivial bandwidth occupation of a small amount training words. So it improves the efficiency of the signal spectrum, which enable it rather good application value. Simulation results indicate that the proposed equalization algorithm possesses good performance of approaching ideal equalization. Furthermore, a algorithm framework of a partially parallel structure is designed and analyzed with the complexity. Therefore, it can realize frequency domain equalization of the high speed and reliable non-linear satellite channel on condition that limited resources are available for the satellite communication implementation. |
| Key words:
satellite communications
CMA blind equalization
BLMS equalization
group delay
cost function
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| 收稿日期: 2017-03-30
修回日期:
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| DOI: |
| 基金项目: 浙江省自然科学基金（LZ14F010003）与国家自然科学基金（61471152）资助 |
| 通讯作者:
Email： |
| 作者简介: 高翔(1975-),西北工业大学博士研究生,主要从事信号处理研究。
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| 作者相关文章 |
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| 高翔 在本刊中的所有文章 |
| 李勇 在本刊中的所有文章 |
| 包建荣 在本刊中的所有文章 |
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