| 量化LMS算法的自适应滤波器及其低功耗设计 |
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| 引用本文： | 刘爱林,叶凡,吴新华,任俊彦.量化LMS算法的自适应滤波器及其低功耗设计[J].复旦学报(自然科学版),2006,45(1):39-44. |
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| 作者姓名： | 刘爱林 叶凡 吴新华 任俊彦 |
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| 作者单位： | 复旦大学,专用集成电路与系统国家重点实验室,上海,200433 |
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| 基金项目： | 国家“八六三”计划资助项目(2003AA1Z1160) |
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| 摘 要： | LMS算法实现自适应滤波器,电路结构简单且能够达到满意的性能,广泛应用于以太网和802.11无线局域网中.分析了3种量化LMS算法的收敛速度和稳态误差,提出了用2-指数来量化误差信号,符号截断来量化输入序列;提出了用半加器来实现系数自适应调整,量化后的系数更新因子只有一个“1”,性能可以和传统的LMS算法媲美,硬件规模和功耗只有传统LMS算法的60%.
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| 关 键 词： | 自适应滤波 2-指数量化 符号截断量化 收敛速度 稳态误差 |
| 文章编号： | 0427-7104（2006）01-0039-06 |
| 收稿时间： | 2005-03-17 |
| 修稿时间： | 2005-03-17 |
Adaptive Filter Implemented by Quantized LMS Algorithm and Its Low Power Design |
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| LIU Ai-lin,YE Fan,WU Xin-hua,REN Jun-yan.Adaptive Filter Implemented by Quantized LMS Algorithm and Its Low Power Design[J].Journal of Fudan University(Natural Science),2006,45(1):39-44. |
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| Authors: | LIU Ai-lin YE Fan WU Xin-hua REN Jun-yan |
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| Abstract: | Adaptive filter implemented by LMS(least mean square) algorithm,which has widely applied to Ethernet and 802.11 wireless LAN widely,has a simple circuit architecture and satisfied performance.The convergence rate and steady error of three quantization LMS algorithms are analyzed.A new quantization LMS algorithm is proposed,which quantizes error with power-of-two and input with sign-clipped-data.The good performance can be compared with traditional LMS algorithm.As there is only one "1" in the update coefficient, half adder is proposed to get new coefficient,which consumes only 60% hardware and power of traditional LMS algorithm. |
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| Keywords: | adaptive filter power-of-two sign-clipped-data convergence rate steady error |
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