RSSI variance

RE: RSSI variance

run_ar — Tue, 08 Mar 2016 10:23:04 GMT

The environment in which you measure this would also affect the result as you will have reflections that can vary over frequency. Note that I'm not able to see the files you attached in your questions, so I'm not sure how your measurements look.

RE: RSSI variance

Alex Cheng — Tue, 08 Mar 2016 03:37:49 GMT

Could you please detail " In addition there will be some variance from channel to channel due to some non-linearity." ? We do found that some channel has poor performance.

RE: RSSI variance

run_ar — Tue, 01 Mar 2016 13:38:02 GMT

Actually this is the chip to chip production variance + variance over input power + margins. The actual on chip variance from measurement to measurement on the same channel would be more accurate, probably something closer to +/- 1-2 db. In addition there will be some variance from channel to channel due to some non-linearity. You will also get some variance because of the output on the transmitter radio (variance in radio + filter + antenna) over the frequency band. And the same variance over the input on the receiving radio. In addition you will probably have some reflections that will vary based on frequency.

RE: RSSI variance

Alex Cheng — Tue, 01 Mar 2016 01:05:38 GMT

The chip we used is nRF51822. You mean no matter the Antenna we used the RSSI accuracy is +/- 6dB within the valid range of -50 dBm to -80. May I know the root cause ?

RE: RSSI variance

run_ar — Wed, 17 Feb 2016 08:06:32 GMT

Which chip are you testing with? For the nRF51822 the RSSI accuracy is +/- 6dB within the valid range of -50 dBm to -80 dBm.