Hi Marc, 10 dBm difference between two motes is completely normal. You should reverse the roles of the two nodes and compare the result.
Best, Miklos 2011/10/5 Marc Barceló <[email protected]>: > Hi Miklos, > > Thanks for the answer. I have not changed the RF230DriverLayerP file. In > fact, I have used both measurements in two different motes but using exactly > the same conditions. I think it is normal to have some dB between them, but I > think the difference is too high. Any idea about the reason then? > > On the other hand, since the ED measure only measures the IEEE 802.15.4 > packets power, should it not give always equal or less power than the RSSI > measure, which takes into account every signal received in the measured > region? > > Thanks in advance for the help, > > Marc > > > El 05/10/2011, a las 10:03, Miklos Maroti escribió: > >> Hi Marc, >> >> Have you changed the RF230DriverLayerP file? I think the ED and RSSI >> measurements are not performed at the same time. The ED is done >> automatically by the hardware after the SYNC byte is received, while >> the RSSI is done manually when the first interrupt is handled. This >> could cause some difference. >> >> Best, >> Miklos >> >> 2011/10/5 Marc Barceló <[email protected]>: >>> Hello to everyone, >>> >>> I am a researcher working on WSN, using IRIS motes (which use RF230 Radio >>> Hardware). I am measuring the received power from one mote to another. The >>> RF230 datasheet says that two different measures can be used, Energie >>> Detection (ED) or Received Signal Strength Indicator (RSSI). To convert the >>> measured values to dBm, according to the datasheet, for the first case it >>> is necessary to do: PRF = ED_VAL -91. For the second case the following has >>> to be done PRF = RSSI_BASE_VAL + 3•(RSSI - 1). The problem is that these >>> measures does not seem to be equivalent since using the ED measure I >>> receive more power( a difference greater than 10 dB) in comparisson with >>> the RSSI measure. I am using the Basic operating mode so, since what I >>> know, both measures should be very similar. >>> >>> I would appreciate any help, >>> >>> Best Regards >>> _______________________________________________ >>> Tinyos-help mailing list >>> [email protected] >>> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >>> > > _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
