RSSI accuracy

[Stanislav Silnitskiy]

Hello!

As per documentation, RSSI is measured during the time, when particular packet is being received. In particular, nRF51822 Product Specification v3.1 states RSSIperiod as 8.8 us at minimum. Does it mean, that it can differ for packets with different length?

If so, does it mean, that overall accuracy of RSSI can be improved, implementing a sophisticated filter over greater number of RSSI samples for shorter packets, compared to averaging for longer packets, as it is implemented in hardware?

[Kenneth]

The RSSI measurement is done one time for each packet received, there is a radio short 'ADDRESS_RSSISTART' that can be enabled to do one RSSI sample after each radio address match.

[Kenneth]

I guess it depends on the packet, but presuming an empty packet in BLE, that will be 40bit (40us) including 3byte CRC after the address match. So maybe you can do 2-3 sampling in best case during that time.