LE 1M AND LE 2M PHYs

[Bretley]

Hi,

I have nrf52832 dK and know how to configure them in code.

I have studied BLE supports the LE 1M phy and LE 2M phys from BLE core specifications.

I know about the packet structures also.

I want to have a theoretical understanding of what exactly is LE 1M and LE 2M operation mathematically. I am not able to find exact description of the operations.

[Elfving]

Hello Bretley,

Well the LE 1M PHY is the standard 1 Mb/s bit rate, 1 Msym/s symbol rate. Each bit maps to a single radio symbol. The 2M PHY is double the rate, as it is being modulated at twice the speed. This comes at a small cost to range, and the throughput won't necessarily be doubled. 

You can read a bit more on what is new in advertising here.

Was this the mathematical theoretical explanation you were looking for? If not, could you expand a bit on what you are wondering about?

Regards,

Elfving

[Bretley]

Hey Elfving,

Thanks for response.

I want to have a deep understanding of LE 1M and LE 2M phys something like mathematics or diagrammatically explanation.

[Bretley]

Gentle Reminder 

[Elfving]

Could you expand on what parts of the concepts you'd want a mathematical or diagrammatical explanation of, or what could be made clearer?

[Bretley]

Like if someone asks “What is LE 1M/ 2M Phy?”

As all blogs say LE 1m uses one bit per symbol and other uses two bits enhancing data rate!!

but how exactly is this done?

how symbols are mapped ?

how the Phy operation works actually leading to increased speed but constraint on range?

[Bretley]

Hey Elfving, 

Gentle Reminder Please if you could help me with the LE 1m and Le 2m phys explanations at earliest please