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RSSI VS RX FILTER BANDWIDTH

Eswaran Rathinam12
Intellectual 350 points
Other Parts Discussed in Thread: CC1200

Hello ,Im using cc1200 development kit.Im testing the PER For different attenuations.
why the RSSI Increases when i increase RX Filter bandwidth?
Im using a 95Db attenuator between TX and RX,so when i use the 1.2Kbbps,10.96Khz Bandwidth,the packet error is around 81%.But when i increase the RX Filter bandwidth,it came to 0%.And the RSSI Increases correspondingly.
a)1.2Kbps,RX Filter bandwidth=10.96Khz RSSI=>-102.1Dbm.PER=81%
b)1.2Kbps,RX fILter bandwidth=11.90Khz RSSI=>-97.7Dbm.PER=0%
c)1.2Kbps,RX Filter bandwidth=14.88KHZ RSSI=>-89.8Dbm.PER=0%
4)I dont understand why there is reduced packet error when i increase the bandwidth for the same data rate?

Please HELP..Thank you..

  • 0
    TI__Guru**** 317180 points

    This question has been answered often on this forum.

    The signal bandwidth (99% OBW) is 9.6 kHz for a 2FSK 1.2 kbps, 4kHz deviation signal. That means that if you have a slight offset frequency offset between Rx and Tx (remember that your xtal has x ppm inaccuracy) the signal will be partially outside your receive bandwidth and you will not be able to receive.