Texas Instruments CC13 Series, Application Report

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Measurement Results
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8 SWRA523B – September 2016 – Revised March 2017
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CC13xx Antenna Diversity
4 Measurement Results
4.1 System Parameters
The system parameters used when testing the antenna diversity patch are as follows:
• 2-GFSK modulation
• 50-kbps data rate, ±25 kHz deviation
• 868 MHz
• 6- or 8-byte preamble
• 4-byte sync word (0x930B 51DE)
• Carrier sense (CS) threshold set to –111 dBm
4.2 Conducted Measurements
4.2.1 Sensitivity
Table 5 lists the sensitivity measurement results.
Table 5. Typical 1% BER Sensitivity (20% PER, 3-Byte Payload)
Preamble Length Typical Sensitivity [dBm]
6 bytes –109
8 bytes –109
4.2.2 Packet Error Rate (PER) versus Input Power Level
A 20% PER corresponds to a 1% bit error rate (BER).
4.2.2.1 6-Byte Preamble
Figure 3 shows the PER versus the input power level with a 6-byte preamble and a 6-dB attenuator on
one antenna.
Figure 3. PER vs Input Power Level
(6-Byte Preamble, 6-dB Attenuator on One Antenna)