Texas Instruments CC13 Series, Application Report

Page: 14 / 17

Measurement Results
www.ti.com
14 SWRA523B – September 2016 – Revised March 2017
Submit Documentation Feedback
Copyright © 2016–2017, Texas Instruments Incorporated
CC13xx Antenna Diversity
4.3.5 Test 3
Test 3 is the same as Test 2, but with a different TX output power level to see how much the power level
had to be increased for a system not using antenna diversity to achieve the same PER as a system using
antenna diversity.
Table 8 lists the PER for Test 3.
Table 8. Test 3 PER for Boards Using ANT1, ANT2, or Diversity (DIV)
Antenna Output Power [dBm]
Number of Received
Packets
Number of Sent
Packets
PER [%]
ANT1
–46 632 3000 78.9
–42 1551 2000 22.5
–38 1971 2000 1.5
ANT2
–46 2696 3000 10.1
–42 1900 2000 5.0
–38 1983 2000 0.8
DIV
–46 2751 3000 8.3
–42 1944 2000 2.8
–38 1999 2000 0
In this test, an increase in TX power of approximately 4 dB was required to achieve the same PER for the
board connected to ANT1 as for the board using antenna diversity (–38 dBm versus
− 42 dBm,
respectively).
4.3.6 Test 4
The RX boards were placed in a fixed location. The TX board was carried around the TI office. Table 9
lists the PER for Test 4.
Table 9. Test 4 PER for Boards Using ANT1, ANT2, or Diversity (DIV)
Antenna Number of Received Packets Number of Sent Packets PER [%]
ANT1 2055 3000 31.5
ANT2 2114 3000 29.5
DIV 2403 3000 19.9
The board using antenna diversity (DIV) yielded a lower PER than the single-antenna boards (ANT1 and
ANT2).