I was going back through some old Camibum webinar slides from 2023 for ePMP 4k and had some questions about what was mentioned in the slides and what is currently working in ePMP 4k radios.
OFDMA - The webinar mentioned 2 advantages of OFDMA
- Small packet grouping in the OFDMA PPDU to improve efficiency and capacity.
- Preamble Puncturing - This technique can boost throughput in crowded environments where narrow-band interference is common, preventing, for instance, a 20 MHz neighbor-network signal from killing a 160 MHz link.
Are both those features currenlty active in the latest FW? Maybe I misunderstand the preamble puncturing, but I know I have had many times where 40mhz of interference on 1/2 of an 80mhz channel (mostly AP side) has killed performance so much I have had to change to a smaller channel using Asymetrical UL.
The other question is about MU-MIMO. Early presentations said ePMP 4k would support both DL and UL MU-MIMO. I know DL MU-MIMO is working and that the 4500 due to current HW limitations only can do MU3 and not MU4 that was mentioned originally. That is understandable as sometimes the reality of the hardware and its limitations are not fully known early on. Is UL MU-MIMO still on the table for a future feature, or has that been changed as well because of unforseen HW limitations.