This was the first time I ever saw the spreading factor explained mathematically. This was an excellent video, but the lack of the speaker being mic’d made it difficult to listen to with the echo; please mic him next time. Also, I had to stream at 720p to read some of the slide content (slow on my connection); it was 360p otherwise. It would have been nice to have a PDF or PP link to accompany the presentation. It was a very good video, and the speaker did very good as well.
Hello Todd. I copied the presentation by playing it in a good resolution monitor and using OneNote click tool to copy the slides and paste them in a PP presentation. It would take only 5 minutes or less.
Excellent speach!! Very complete and clear. However, there are still some questions in the air. As long as I understand Spreading Factor is also the Number of bit per figure. And what is called a chip, would be the figure's LSB (the small value changing in the figure when a LSB change). Is that right? For me it is easier to understand in that way.
I remember, i read about chip in one of the very good and mathematical research paper on LoRa that Chip is essentially (1/BW) where BW is Bandwidth. If the signal has a BW of say, 250 KHz. That means, 250 K vibrations per second. The inverse of which, i.e, 1/250 KHz = 4 micro-second, gives the amount of time that a single vibration or a chip last longs. This is the understanding that I have for chip.
256 end point talking to the network at the same time 34:28 is that actually possible? most LoRaWAN gateways that i've seen support only 8 channels, did I get something wrong?
modify when they send the signals out. you need to time when they send out. if you are broadcasting every hour and you have 600 devices each device can send out at different times to not all hit the gateway at the same time. There are use cases for mass power outages where all devices are trying to ping the gateway where they need to not only use ADR but also a random delay to allow the fastest return to operation time as possible.
This was the first time I ever saw the spreading factor explained mathematically. This was an excellent video, but the lack of the speaker being mic’d made it difficult to listen to with the echo; please mic him next time. Also, I had to stream at 720p to read some of the slide content (slow on my connection); it was 360p otherwise. It would have been nice to have a PDF or PP link to accompany the presentation. It was a very good video, and the speaker did very good as well.
Hello Todd. I copied the presentation by playing it in a good resolution monitor and using OneNote click tool to copy the slides and paste them in a PP presentation. It would take only 5 minutes or less.
Excellent speach!! Very complete and clear. However, there are still some questions in the air. As long as I understand Spreading Factor is also the Number of bit per figure. And what is called a chip, would be the figure's LSB (the small value changing in the figure when a LSB change). Is that right? For me it is easier to understand in that way.
I remember, i read about chip in one of the very good and mathematical research paper on LoRa that Chip is essentially (1/BW) where BW is Bandwidth.
If the signal has a BW of say, 250 KHz. That means, 250 K vibrations per second.
The inverse of which, i.e, 1/250 KHz = 4 micro-second, gives the amount of time that a single vibration or a chip last longs.
This is the understanding that I have for chip.
256 end point talking to the network at the same time 34:28 is that actually possible? most LoRaWAN gateways that i've seen support only 8 channels, did I get something wrong?
the 125hz frequency within each channel allows the extra paths.
so how you can handle 1000 points reporting in with the duty cycle of lora.......
modify when they send the signals out. you need to time when they send out. if you are broadcasting every hour and you have 600 devices each device can send out at different times to not all hit the gateway at the same time. There are use cases for mass power outages where all devices are trying to ping the gateway where they need to not only use ADR but also a random delay to allow the fastest return to operation time as possible.