Demodulation:CFO:Results:Maximum Payload Block Frequency Offset (Hz) Property

Short Name: LE CFO Maximum Payload Block Frequency Offset (Hz)

Property of niBTAnalysis

Returns the maximum frequency offset that the toolkit computes by using preamble and by demodulating the FM signal payload. This value is expressed in Hz.

The toolkit integrates the frequency of the FM demodulated signal starting from the center of the first preamble bit to the center of the first bit following the last preamble bit. For LE-LR-125k packets, the frequency integration is done from the start of the third preamble bit to the end of the 18^th preamble bit. This value is recorded as f₀ .

For LE-LR-125k packets, the frequency offsets are calculated also for the three 16-bit groups after the 18^th bit in the preamble and are recorded as f₁ , f₂ , and f₃ .

The toolkit then integrates the frequency deviation of every x bits in the payload starting from the y^th payload symbol and it is repeated until the end of the payload duration. The integral sums are recorded as f_n (n≥4 for LE-LR-125k and n≥1 for all other packets).

For LE-Enhanced packets, x = 20 and y = 2.

For LE-LR-125k packets, x =16 and y = 27.

For other LE packets, x = 10 and y = 2.

The toolkit finds the maximum of |f_n | over different acquisitions, and adds the corresponding f_n sign to the result.

Remarks

The following table lists the characteristics of this property.

Datatype
Permissions	Read Only
High-level VIs	niBT SA LE CFO Get Maximum Payload Frequency Offset
Resettable	No