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SX1211
WIRELESS & SENSING
Set SX1211 in OOK Rx mode
Adjust Bit Rate, Channel filter BW
Default RXParam_OOK_thresh setting
No input signal
Continuous Mode
Monitor DATA pin (pin 20)
Increment
MCParam_OOK_floor_thres
Glitch activity
on DATA ?
Optimization complete
Figure 23: Floor Threshold Optimization
The new floor threshold value found during this test should be the value used for OOK reception with those receiver
settings.
Note that if the output signal on DATA is logic “1”, the value of MCParam_OOK_floor_thres is below the noise floor
of the receiver chain. Conversely, if the output signal on DATA is logic “1”, the value of MAParam_floor_thres is
several dB above the noise floor.
3.4.10.2. Optimizing OOK Demodulator Response for Fast Fading Signals
A sudden drop in signal strength can cause the bit error rate to increase. For applications where the expected
signal drop can be estimated the following OOK demodulator parameters RXParam_OOK_thresh_step and
RXParam_OOK_thresh_dec_period can be optimized as described below for a given number of threshold
decrements per bit RXParam_OOK_thresh_dec_period:
000
001
010
011
100
101
110
111
once in each chip period (d)
once in 2 chip periods
once in 4 chip periods
once in 8 chip periods
twice in each chip period
4 times in each chip period
8 times in each chip period
16 times in each chip period
For each decrement of RXParam_OOK_thresh_step:
000
001
010
011
100
101
110
111
0.5 dB (d)
1.0 dB
1.5 dB
2.0 dB
3.0 dB
4.0 dB
5.0 dB
6.0 dB
Rev 8 – February 2013
Page 30 of 92
www.semtech.com
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