Online Contributions Playlist
All posts by firas.shaari
A New Milestone Achieved !
On the 10/08/2021 at around 2:00pm I passed the CWISA Certification exam with a score of 97%. I am excited as this the first step in my journey towards achieving the CWISE (Certified Wireless IoT Solution Expert) certification.
HE MU-MIMO vs VHT MU-MIMO
The 6th video in the series of the 802.11ax training videos. In this video I explain the difference between SU-MIMO and MU-MIMO and how MU-MIMO is done differently in the 802.11ax standard compared to legacy MU-MIMO.
OFDMA In Action
The 5th video in the series of the 802.11ax training videos. In this video I explain the process that APs and STAs have to go through to complete an OFDMA transmission in the 802.11ax standard.
OFDM vs OFDMA
The 4th video in the series of the 802.11ax training videos. In this video I explain the difference between OFDM and OFDMA and introduce the concept of RUs in the 802.11ax standard
PPDU Format
The 3rd video in the series of the 802.11ax training videos. In this video I explain the different types of PPDUs in the 802.11ax standard.
802.11ac vs 802.11ax
The 2nd installment in the series of the 802.11ax training videos. In this video I highlight most of the important differences between 802.11ac and 802.11ax.
802.11ax.. What I have learned so far
This is the 1st video in a series of short videos yet to come. In these videos I will share my knowledge and experience on the 802.11ax standard that I have accumulated over almost 3 years of extensive testing, reading literature and, learning from other people in our WiFi community.
Dual Band ANT performance in The 6GHz Band
Looking at the S11 and S21 parameters of dual band ANTs shows acceptable performance up to 6.7GHz. In the photos below 4 markers on the S21 parameter graph can be seen. MK1 was set to the beginning of the 2.4GHz band, MK2 was set at the beginning of the 5GHz band, MK3 was set at the last frequency in the 6GHz where the dual ANTs still gave acceptable levels of performance and finally MK4 was set at the end of the 6GHz band (7.2GHz) where the performance degraded by a factor of 6dB below the performance measured in the 5GHz band.
Note: For more info on the S-Parameters and what do they mean you. this page https://www.antenna-theory.com/definitions/sparameters.php gives a simple and clear explanation of the concept.
A New Milestone Achieved !
On the 23/02/2021 at around 10:00am I took on a 4 hours exam an attempt to achieve the iNARTE Spectrum Management Certification. The exam was challenging, I wouldn’t say it was difficult but, definitely it wasn’t an easy one. For anyone who might be interested in taking on the exam a good background in Electrical Engineering principles and a fair knowledge of HAM radio rules regulations and best practices will definitely be a big a help to clear this exam. Finally, you can check my certification by clicking on the link below.