I need to transmit and receive data between Rpi and Arduino, in RF (Radio Frequency).
I must say I have next to zero experience in this field. So any help, papers, documentation, book or manual would be much appreciated.
Actually I don’t have a clue where to start. I hope to get all necessary information including the following:
(1) RF communication protocol, tutorials, libraries, and demo programs,
(2) RF modules to use for my RF project.
Question
How can Rpi talk to Arduino in RF?
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Answer
For poor IoT hobbyists like me, I would suggest to start with:
(1) BLE (2.4GHz),
(2) NFC (13.56MHz), and
(3) 5G (452.5 ~ 467.5MHz, 700MHz~ 2.2GHz)
Above three are wild choices.
For newbies, I would eliminate
(1) BLE, because RPi4B buster BLE still have teething problems,
(3) 5G (LTE-M), because it might also have teething problems, when finally coming to town, hopefully in 2020April.
So I think
(2) 2.4G modules seems to be the optimum choice.
And for hobbyists, I would recommend the popular, but still cheap, US$1 module nRF24L01+. You can find loads of Arduino tutorials on this cheap module. There is also a Rpi to Arduino tutorial (Ref 2, 3).
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References
(1) Connect Your MCU – Øivind Loe, Senior Product Manager – MCU and Sensors, Silicon Labs， 2020feb
(2) Rpi SPI nRF24L01+ 2.4GHz Transceiver Module Send Message to Arduino Problem (Q&A)
(3) Rpi SPI nRF24L01+ 2.4GHz Transceiver Module Send Message to Arduino Problem (Chat Record)
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Appendices
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Figures
Fig 1
Fig 2
Fig 3
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tlfong01.blog 
certain RF modulation… that meansspecific RF modulation….. why did you not say which RF modulation you are talking about? – jsotola 4 hours ago