| 摘要: |
| 本文讨论了软件无线电接收机中数字下变频处理的高效算法和结构，其目的是在DSP中用软件完成数字下变频处理，这样可省去专用数字下变频器（DDC）硬件集成电路，并增强中频处理的灵活性，适应性，文中指出将混频、抽取、滤波结合在一起完成将大大减少运算量，并分析了将CIC滤波器与内插的二阶多项式滤波器组合进行有效抽取滤波的设计方案，仿真结果表明该方案有效可行。 |
| 关键词: 软件无线电 数字下变频器 内插二阶多项式 算法 接收机 |
| DOI：10.3969/j.issn.1001-893X. |
| 修订日期：2002-04-23 |
| 基金项目:华北航天工业学院科研基金资助项目 |
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| Software Implementation Technology in Digital Down Converting Process |
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| Abstract: |
| The main purpose of this paper is to analyze the efficient algorithm of DDC, so that the DDC process can be implemented in software on general purpose DSP and can afford greater flexibility. Combining mixing with decimating and filting can greatly reduce the amount of operations. A decimation filter for DDC is proposed and proved to be effective by simulation. The proposed decimation filter is a cascade of a CIC filter, an ISOP(Interpolated second-order polynomials), and an FIR filter. |
| Key words: Software radio,Digital down converter,ISOP(Interpolated Second-Order Polynomials),Algorithm, |
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