Given: You are evaluating the theoretical and real-world RF gain benefits of transmit and receive features introduced by 802.11 with MIMO. This
exercise allows you to quantify the features value in a real-world environment.
What is the maximum theoretical signal gain of chip-based TxBF and MRC (as features) when compared to the same AP using only a single
antenna for transmit and receive (effectively simulating a 1x1 chip)?
The maximum theoretical signal gain of chip-based TxBF and MRC depends on the number of antennas and the channel conditions. TxBF (transmit beamforming) is a technique that focuses the transmitted signal in the direction of the intended receiver, resulting in higher signal strength and less interference. MRC (maximum ratio combining) is a technique that combines the signals received by multiple antennas in an optimal way, resulting in higher signal-to-noise ratio and better performance. The theoretical gain of TxBF and MRC can be calculated as
GTxBF=10log10(N)
and
GMRC=10log10(N)
where N is the number of antennas. Therefore, the total gain of TxBF and MRC is
Gtotal=GTxBF+GMRC=20log10(N)
However, this is the ideal case and assumes perfect channel conditions and alignment. In reality, the gain is lower due to factors such as channel fading, antenna spacing, and feedback delay. According to the CWDP study guide1, the typical gain of TxBF and MRC is about 4-6.5 dBi for 2 antennas, 7-10 dBi for 3 antennas, and 10-13 dBi for 4 antennas. Therefore, the answer is D. Reference: 1: CWDP Certified Wireless Design Professional Official Study Guide: Exam PW0-250, Chapter 8, page 267.
During a post-validation assessment, you have configured a client for 802.1X/EAP but it is not passing authentication. Which areas should you check in the WLAN configuration?
Response:
When installing APs on high ceilings, what should be the most common PPE to be used?
You have performed a validation site survey after deploying a WLAN infrastructure that is an All-Wireless-Office. One specific application of your
customer is experiencing delay when using the application after moving from wired connectivity. After your validation, you realized that all APs are
using 80 MHz channel- widths instead of 20 MHz on the 5 GHz band, as it was designed. What can be done to resolve the delay on this
application?
If radar has reportedly been detected on your WLAN deployment, what bands would you consider avoiding?
Response:
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