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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?

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  • 0

    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.

  • 0 in reply to Kenneth

    The length of time doesn't vary depending on packet lenght no, the radio simply take one single sample of the receive signal strength each time the RSSISTART task is triggered. You are free to trigger the task as frequently as you like, though you would like to wait for the RSSIEND event to read out the actual RSSISAMPLE before next RSSISTART task.

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  • 0 in reply to Kenneth

    The length of time doesn't vary depending on packet lenght no, the radio simply take one single sample of the receive signal strength each time the RSSISTART task is triggered. You are free to trigger the task as frequently as you like, though you would like to wait for the RSSIEND event to read out the actual RSSISAMPLE before next RSSISTART task.

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