| 摘要: |
| 为解决软件无线电（Software Defined Radio，SDR中采样后信号混叠问题，提出了一种改进的相位调整滤波算法。依托具备可调时间延迟的二阶射频带通采样前端，设计了一种支持多分点分段滤波的抗混叠滤波器,可以根据实际需求灵活设置多个频率分点，从而实现针对不同频段的精确滤波。通过在MATLAB SIMULINK中进行仿真验证，该方法相比同类方法的滤波器抑制效果更佳，达到38 dB以上，并能有效滤除所需信号而不影响其他信号的完整性，简化了接收前端，具备较强的灵活性和适应性，能够更好地支持未来的通信技术和高密度通信连接。 |
| 关键词: 软件无线电（SDR 滤波器设计 二阶带通采样 相位调整滤波 信号重构 |
| DOI：10.20079/j.issn.1001-893x.240420001 |
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| 基金项目:国家自然科学基金面上项目(62371451 |
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| Design of a Multi-band Alias Signal Receiving Filter |
| WANG Hongmei,WANG Junze,LI Shiyin,WANG Faguang,LIU Shuo |
| (School of Information and Control Engineering,China University of Mining and Technology,Xuzhou 221116,China) |
| Abstract: |
| To solve the problem of signal aliasing after sampling in software defined radio(SDR,an improved phase-adjusted filtering algorithm is proposed.Based on the second-order RF bandpass sampling front-end with adjustable time delay,an anti-aliasing filter that supports multi-segment filtering is designed,and multiple frequency segments can be flexibly set according to the actual needs,so as to achieve accurate filtering for different frequency bands.Through the simulation verification in MATLAB SIMULINK,the method has better suppression performance than similar filters(38 dB or more,and can effectively filter out the required signal without affecting the integrity of other signals,which simplifies the receiving front-end,has strong flexibility and adaptability,and can better support future communication technology and high-density communication connections. |
| Key words: software defined radio(SDR filter design second-order bandpass sampling phase-adjusted filtering signal reconstruction |
