IEICE Transactions on Communications
Online ISSN : 1745-1345
Print ISSN : 0916-8516
Special Section on Wired-and-Wireless Network System Technologies in Beyond 5G Era
RF Signal Frequency Identification in a Direct RF Undersampling Multi-Band Real-Time Spectrum Monitor for Wireless IoT Usage
Tomoyuki FURUICHIMizuki MOTOYOSHISuguru KAMEDATakashi SHIBANoriharu SUEMATSU
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2022 Volume E105.B Issue 4 Pages 461-471

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Abstract

To reduce the complexity of direct radio frequency (RF) undersampling real-time spectrum monitoring in wireless Internet of Things (IoT) bands (920MHz, 2.4GHz, and 5 GHz bands), a design method of sampling frequencies is proposed in this paper. The Direct RF Undersampling receiver architecture enables the use of ADC with sampling clock lower frequency than receiving RF signal, but it needs RF signal identification signal processing from folded spectrums with multiple sampling clock frequencies. The proposed design method allows fewer sampling frequencies to be used than the conventional design method for continuous frequency range (D.C. to 5GHz-band). The proposed method reduced 2 sampling frequencies in wireless IoT bands case compared with the continuous range. The design result using the proposed method is verified by measurement.

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© 2022 The Institute of Electronics, Information and Communication Engineers
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