The company has a Wi-Fi network, and the company area is quite large. There is a dead zone in which the Internet is not available by client devices (about 30% of the total area). There were attempts to use the router as a repeater, but they were not crowned with success, as it was impossible to trace the users connected to the repeater (all users show up as a repeater). As far as I know, the repeater also does not nave a very good effect on network bandwidth.
Are there any ways to enhance the Wi-Fi signal without using repeaters? Using a cable is not considered as an option. It is also necessary that the network need to has seamless roaming.