A Filter Design Method of Direct RF Undersampling On-Board Receiver for Ka-Band HTS

Furuichi, Tomoyuki; Yang, Gangqiang; Motoyoshi, Mizuki; Kameda, Suguru; Shiba, T.; Suematsu, Noriharu

doi:10.1587/transcom.2019cbp0008

IEICE Trans. Commun.

2020

DOI: 10.1587/transcom.2019cbp0008

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A Filter Design Method of Direct RF Undersampling On-Board Receiver for Ka-Band HTS

Tomoyuki Furuichi

Gangqiang Yang

Mizuki Motoyoshi

et al.

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Cited by 3 publications

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“…shows block diagram of fabricated 28GHz-band direct digital RF receiver and measured frequency dependence on receiver Noise Figure (NF).Careful design of RF anti-aliasing filter enables wide receiver bandwidth (460 MHz) with reasonable NF (below 3.1 dB) which is almost same as theoretical limit of Nyquist frequency (487 MHz) of direct RF under sampling(Furuichi et al, 2020).…”

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Direct Digital RF Transceiver Technology for Millimeter‐Wave DBF Systems

Suematsu

2024

Radio Science

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Digital RF technology has been developed and has been applied to below 6 GHz wireless applications. By replacing the IC die consumptive RF/analog circuit blocks by digital signal processor and circuit, digital rich/small transceivers can be realized. Since the foundation of this technology is based on the Nyquist theory, the operational frequency of the circuit has been limited by the Nyquist frequency (=1/2 of sampling clock frequency). As a result, the maximum operational RF frequency of existing digital RF technology was below 6 GHz. In this paper, a new direct digital RF technology that utilizes the higher‐order Nyquist zones is introduced. This technology enables handling RF signal in beyond Nyquist frequency range which means over 6 GHz range. The results of fabricated 26/28 GHz‐band transmitter/receiver are reviewed. Since the transceiver architecture with the proposed technologies does not require an RF local oscillator and up/down converters, it is suitable for microwave/millimeter‐wave multi‐antenna systems such as next generation satellite on‐board digital beam forming and Beyond 5G fully digital Massive multiple‐input multiple‐output systems.

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confidence: 93%

Direct Digital RF Transceiver Technology for Millimeter‐Wave DBF Systems

Suematsu

2024

Radio Science

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RF Signal Frequency Identification in a Direct RF Undersampling Multi-Band Real-Time Spectrum Monitor for Wireless IoT Usage

Furuichi

Motoyoshi

Kameda

et al. 2022

IEICE Trans. Commun.

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Interaction Design Based on Big Data Community Home Care Service Demand Levels

2023

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Most of the contemporary models for meeting the majority of the needs of middle-aged and elderly people are community-based, in-home care. Therefore, this paper designs an Interaction model that can meet the need for a rich spiritual and cultural life of the elderly at home. First, the questionnaire content of the Chinese Longitudinal Healthy Longevity Survey (CLHLS) sampling method was designed based on the content of community-based home care services. Then, using the CLHLS sampling method, the survey results of the home care group were collected to form a community of big data consisting of four types of home care service needs. Finally, the Interaction book model was designed based on the hierarchy of service needs obtained from Abraham Maslow’s hierarchy of needs classification method. The experimental results showed that the mean values of the target population’s ratings for the presentation and interface aesthetics of the Interaction mode were 4.34 and 4.19, respectively, the mean value for improving the learning effectiveness of the home-bound population was 4.57, and the mean value for their overall satisfaction was 4.31. It proves that the Interaction model is ideal for practice and can meet the learning needs of the elderly, at-home population from different service demand levels, thus solving the problem of education for the elderly.

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A Filter Design Method of Direct RF Undersampling On-Board Receiver for Ka-Band HTS

Cited by 3 publications

References 14 publications

Direct Digital RF Transceiver Technology for Millimeter‐Wave DBF Systems

Direct Digital RF Transceiver Technology for Millimeter‐Wave DBF Systems

RF Signal Frequency Identification in a Direct RF Undersampling Multi-Band Real-Time Spectrum Monitor for Wireless IoT Usage

Interaction Design Based on Big Data Community Home Care Service Demand Levels

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