Specifications

Page 30
WT1231H
3.4.12.1. Optimizing the Floor Threshold
OokFixedThresh determines the sensitivity of the OOK receiver, as it sets the comparison threshold for weak input signals
(i.e. those close to the noise floor). Significant sensitivity improvements can be generated if configured correctly.
Note that the noise floor of the receiver at the demodulator input depends on:
 The noise figure of the receiver.

The gain of the receive chain from antenna to base band.

The matching - including SAW filter if any.

The bandwidth of the channel filters.
It is therefore important to note that the setting of OokFixedThresh will be application dependant. The following procedure
is recommended to optimize OokFixedThresh.
Set WT1231H in OOK Rx mode
Adjus
t Bit Rate, Channel filter BW
Default OokFixedThresh setting
No input
signal
Continuous
Mode
Monitor DIO2/DATA
pin
Increment
OokFixedThresh
Glitch
activity
on DATA ?
Optimization
complete
Figure 12. Floor Threshold Optimization
The new floor threshold value found during this test should be used for OOK reception with those receiver settings.
3.4.12.2. Optimizing OOK Demodulator 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 OokPeakThreshStep and OokPeakThreshDec can be
optimized as described below for a given number of threshold decrements per bit. Refer to RegOokPeak to access those
settings.
3.4.12.3. Alternative OOK Demodulator Threshold Modes
In
addition to the Peak OOK threshold mode, the user can alternatively select two other types of threshold detectors:

Fixed Threshold: The value is selected through OokFixedThresh

Average Threshold: Data supplied by the RSSI block is averaged, and this operation mode should only be used
with
DC-free encoded data.