cedivad (u/cedivad) - Readit News

cedivad commented on SrsRAN: Open-Source 4G/5G github.com/srsran... · Posted by u/gballan

cedivad · 8 months ago

<shill mode> you can run SRSRan on a small self contained SDR such as the Seeve board. Throughput is not going to be good as a custom stack as it's unoptimised, though.

https://rfnm.com/blog/introducing-seeve

cedivad commented on A Matter of Millimeters: The story of Qantas flight 32 admiralcloudberg.medium.c... · Posted by u/xenophonf

WalterBright · 2 years ago

As a former Boeing engineer, other industries can learn a great deal from how airplanes are designed. The Fukushima and Deepwater Horizon disasters were both "zipper" failures that showed little thought was given to "when X fails, then what?"

Note I wrote when X fails, not if X fails. It's a different way of thinking.

cedivad · 2 years ago

> When my AoA sensor fails, then what?

crickets, let's just randomise which sensor we use during boot, that ought to do it!

cedivad commented on NXP LA9310: A new platform for SDR and the 10-year-old AD9361 RF Transceiver rfnm.io... · Posted by u/cedivad

ajb · 2 years ago

It seems to work a bit better now but it looks like it isn't working as the page stops when it goes into a transition.

There's a writers maxim, "murder your darlings". what they mean is that a work often has some styling, phrases, exposition, even whole characters or subplots that the writer has worked hard on and become attached to, but that detract from the work as a whole. So they have to be removed. I think this may be a darling unfortunately.

cedivad · 2 years ago

Strange. I haven't changed a thing. Just to confirm, the problem yesterday was that the website would be stuck, not that you couldn't move down further by scrolling in an unnatural way, right?

cedivad commented on NXP LA9310: A new platform for SDR and the 10-year-old AD9361 RF Transceiver rfnm.io... · Posted by u/cedivad

themehdi · 2 years ago

Thanks. I have followed you on Twitter, and will discuss this with my RF fellas and get back to you on Discord or email. However, for now, I could mention 2 things that can be attractive to me as a radio amateur and RF hobbyist: 1. Any daughter board that can provide HF coverage, ideally with a few filters for the ham bands. 2. A proper shielding enclosure (shield from external noise, plus provide some heat dissipation)

and 3rd would be on the software side: support in Soapy and GNURadio (osmosdr) but I guess that would eventually come from the community.

This is exciting, and as supporter of previous open source SDR projects, I'm looking forward to more updates and news from you.

cedivad · 2 years ago

:-) The HF daughterboard is the only thing that's missing, I think. To be honest, I was hoping for someone to suggest a nice design on that front.

Here is a render of the enclosure (work in progress): https://i.imgur.com/AEYgLxU.png

And of course we agree on the software side! Soapy + GNURadio are a must. Hopefully my driver-writing skills are up to the challenge!

cedivad commented on NXP LA9310: A new platform for SDR and the 10-year-old AD9361 RF Transceiver rfnm.io... · Posted by u/cedivad

fadedsignal · 2 years ago

It is really cool. I have some questions.

> There are two embedded antennas to ensure that we can always correct any internal frequency drift by syncing to the cell network.

What do you mean? Do you have your own DSP stack to deal with that while user receiving/transmitting? If there is, do you provide any control over it?

Aside from that,

- What is the compatibility with open source LTE, 5G solutions(SRS, OAI, etc.)?

- I couldn't see PPS input. Are you planning to add it with daughterboards?

cedivad · 2 years ago

PPS input/output is off to the side, look for the "User Interface Connector" paragraph on the website.

> What do you mean? Do you have your own DSP stack to deal with that while user receiving/transmitting? If there is, do you provide any control over it?

You can quickly pause whatever is running on the LA9310, push the NXP NLM stack, correct local frequency errors by synching to a cell network tower and then resume normal operation. It's going to cause a glitch, but if you want to maintain frequency accuracy it's a small cost you need to pay. Once you have absolute deviation and drift it should track quite well.

My understanding is that SRS and the like all require beefy desktop-class processors to run in?

cedivad commented on NXP LA9310: A new platform for SDR and the 10-year-old AD9361 RF Transceiver rfnm.io... · Posted by u/cedivad

zbrozek · 2 years ago

I gave up trying to read the page for these reasons.

cedivad · 2 years ago

Is this with an older Firefox version maybe? I've tried with a relatively recent one and couldn't reproduce, but I'll look at the logs and try to fix this now that the HN storm has passed :-)

cedivad commented on NXP LA9310: A new platform for SDR and the 10-year-old AD9361 RF Transceiver rfnm.io... · Posted by u/cedivad

eqvinox · 2 years ago

Any chance to get a direct PCIe connection to plug this into an x86 host?

cedivad · 2 years ago

It would need to be a different design entirely.

cedivad commented on NXP LA9310: A new platform for SDR and the 10-year-old AD9361 RF Transceiver rfnm.io... · Posted by u/cedivad

kam · 2 years ago

What's the software story for the VSPA DSP? Is that going to run user code, or a binary blob that does some filtering and sends I/Q samples to the iMX or USB3?

NXP doesn't share many details on the LA9310. Could just be too early, but it smells like a "you must convince a sales rep you're going to be a qualified customer and sign a stack of NDAs before you dare ask for a datasheet or instruction set manual" situation, which is unfortunate.

cedivad · 2 years ago

NXP are open sourcing a lot of the support stack for the LA9310 to go along with this product release, but I'm afraid they consider the VSPA DSP to be highly proprietary, yes.

Example: https://github.com/nxp-qoriq?q=la93

cedivad commented on NXP LA9310: A new platform for SDR and the 10-year-old AD9361 RF Transceiver rfnm.io... · Posted by u/cedivad

MegaDeKay · 2 years ago

Will this be open source hardware / software like the HackRF One?? I see no mention of this so I assume not?

cedivad · 2 years ago

The schematics will be released publicly when the product is shipping, but it won't be OSHW. I don't want to end up like the HackRF, where one small company is burdened with supporting an ecosystem of what is mostly clones. The HackRF designer himself said he wouldn't do it again.

cedivad commented on NXP LA9310: A new platform for SDR and the 10-year-old AD9361 RF Transceiver rfnm.io... · Posted by u/cedivad

zokier · 2 years ago

> If you need to go lower, I (or someone else) would need to design a custom RFNM daughterboard for low frequencies. You could do direct conversion up to 150 MHz, so it should be a simple task and come with good performances.

If do ship oscilloscope daughterboard that you have on your site, would that work also as SW radio?

cedivad · 2 years ago

You'd probably want something way more sensitive than that, right? Something that goes well into the micro/nanovolts rather than millivolts. But it should be reasonably simple to do. Also the RTL board when designed with a good frontend should be a viable option.