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Low-Complexity Channelizer Based on FRM for Passive Radar Multi-channel Wideband Receiver

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Abstract

The low-complexity channelizer is essential in passive radar multi-channel wideband receiver using array antennas. The digital filter bank is usually used to realize the channelizer. In the paper, a low-complexity channelizer based on frequency response masking (FRM) is proposed to reduce the high computational complexity of the narrow transition bandwidth filter bank. A half-band filter is used to design the prototype filter of the proposed low-complexity channelizer based on FRM. Compared to the maximally decimated filter bank, the decimation coefficient of the non-maximally decimated filter bank can be different from the number of channels, which makes the low-complexity channelizer more flexible. The low-complexity channelizer based on FRM can be directly applied to a wideband receiver without the limit of the sampling rate. The simulation and complexity analysis results show that the proposed low-complexity channelizer is correct and significantly reduces computational and hardware complexities. The proposed low-complexity channelizer makes it possible to implement passive radar multi-channel wideband receiver on a single hardware processor; thus, it is suitable to applied in passive radar multi-channel wideband receiver using array antennas.

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Acknowledgements

This work was supported in part by the National Natural Science Foundation of China under Grant 61571146 and in part by the Foundation of Key Laboratory of Dynamic Cognitive System of Electromagnetic Spectrum Space (Nanjing Univ. Aeronaut. Astronaut.), Ministry of Industry and Information Technology, Nanjing, 211106, China, under Grant KF20181904.

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Authors and Affiliations

  1. College of Information and Communication Engineering, Harbin Engineering University, Harbin, People’s Republic of China

    Wenxu Zhang, Chunguang Zhang, Zhongkai Zhao & Tao Chen

  2. Electrical Engineering, Wright State University, Dayton, USA

    Feiran Liu

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  1. Wenxu Zhang
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  2. Chunguang Zhang
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  3. Zhongkai Zhao
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  4. Feiran Liu
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  5. Tao Chen
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Correspondence to Zhongkai Zhao.

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Zhang, W., Zhang, C., Zhao, Z. et al. Low-Complexity Channelizer Based on FRM for Passive Radar Multi-channel Wideband Receiver. Circuits Syst Signal Process 39, 420–438 (2020). https://doi.org/10.1007/s00034-019-01192-0

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