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Abstract:
This transcript covers the Open Research Institute (ORI) projects meetup on May 13, 2025. The meeting featured updates from various project teams. Michelle provided general ORI updates, including progress on the Earth-Venus-Earth (EVE) link analysis, planned discussions with the Deep Space Exploration Society (DSES) for EVE 2026, ORI's tax filing, publication acceptances, and ongoing planning for the Opulent Voice protocol state machine. Aaron reported progress on DVB-S2 decoding and plans to implement and port an encoder to the PlutoSDR and OpenCPI. Pete presented a new metric for evaluating energy transmission efficiency in multipath channels, particularly relevant to EVE and Earth-Moon-Earth (EME) communications, outlining plans for a series of articles on waveform design based on this metric. St. Paul detailed remote lab system updates, including managing Unraid OS versions. Matthew discussed challenges and refinements in the MSK modem development and, along with Michelle, engaged in a significant discussion about the hardware-software partitioning strategy for the Opulent Voice protocol, focusing on Opus encoding, data queuing, prioritization, and portability considerations across different hardware platforms.
ORI Projects Meetup - May 13, 2025: Key Discussions and Updates
0:00Meeting Opening: Michelle welcomed participants and outlined the meeting's purpose: discussing project progress, future plans, roadblocks, and resource needs for ORI's FPGA projects.
0:33Thomas's Workshop Attendance: Thomas is attending a "Beyond Earth" workshop focused on lunar and space radio missions and will share insights upon his return.
1:31 A major update to the Earth-Venus-Earth (EVE) link analysis has been published, with ongoing work to refine the link budget, particularly regarding system temperature calculations.
2:09 A meeting is scheduled with the Deep Space Exploration Society (DSES) to discuss the EVE 2026 inferior conjunction, focusing on link budgets and potential dish measurement techniques.
2:41 ORI is preparing its full Form 990 tax submission (due May 15th), providing transparency on funding and detailing project activities, successes, and challenges.
3:40 All four articles submitted by ORI to ARRL's QEX magazine have been accepted and are scheduled for publication over the next year.
4:03 Participation continues in the IEEE P1954 drone radio protocol standards group (related to ORI's Neptune OFDM project), with the next meeting postponed to June.
4:48 Pete's article on delay Doppler channel communications is progressing well.
5:02 A regulatory proposal article on amateur LTE communications published by ORI has gained traction and been picked up by other outlets.
5:27 Planning for the Opulent Voice protocol's state machine (managing different communication types like voice, chat, file transfer, authentication) is underway, though lab progress is pending.
6:07 A potential ORI board meeting at Omega Mart in Las Vegas during Defcon (Sunday or Monday) is being considered.
6:38 A recently announced Ribbit user interface update is not yet visible in the web application, requiring follow-up.
Aaron reported continued work on DVB-S2 decoding and encoding despite being busy.
He has a solid DVB-S2 decoder implemented.
His next steps involve implementing and testing an Everis PlutoSDR DVB-S2 encoder and then porting it to OpenCPI to enable broader hardware platform support.
8:46 Pete introduced a new metric for evaluating energy transmission efficiency in multipath channels: the ratio (in dB) of energy per received symbol to energy per transmitted symbol.
11:06 He explained that for multipath channels, unlike single-path channels, this efficiency metric depends on the shape of the transmitted waveform, justifying the design of optimized waveforms.
12:21 Pete plans a series of articles discussing this metric, its application, waveform design for delay Doppler channels, and the potential for improved channel prediction in such domains, particularly for stable channels like Earth-Moon-Earth (EME) and Earth-Venus-Earth (EVE).
15:41 The stability and slow rotation of the Moon make EME and EVE channels particularly good targets for applying these predictive techniques.
16:36 The mathematical work aims to inform better experiment design for over-the-air testing.
17:25 There is an educational opportunity to explain concepts like OTFS more clearly, as existing public documentation can be unclear or contain errors.
21:28 Matthew is focused on refining the MSK modem, cleaning up code, troubleshooting demodulator issues via simulation, and tweaking the differential encoder.
23:41 A significant discussion occurred regarding the hardware-software partitioning for the Opulent Voice protocol, particularly with Paul.
24:12 The need for a hardware-level mechanism (like framing) was discussed to help the receiver stay locked, even when no data is sent, advocating for hardware over software control here.
25:17 Opus voice encoding was discussed; no open-source VHDL encoder was found, leading to exploration of running the Opus library in software on a Zynq processor, which Michelle plans to test.
27:53 Handling other data types (chat, file, authentication) via priority queues managed by a hardware state machine was discussed as a potentially simpler software interface.
29:41 A simple hardware implementation using priority queues and sending dummy frames (PRBS) when queues are empty was suggested.
33:22 A complex aspect is potentially preempting lower-priority data mid-frame if high-priority data (like voice) arrives, requiring careful frame structure design.
34:36 Matthew plans to propose a specific hardware-level design for the Opulent Voice framework for further discussion.
36:43 Portability to different hardware platforms (like a Raspberry Pi with a separate FPGA, vs. integrated Zynq) is a key consideration influencing the interface design between processor (software) and FPGA (hardware).