Code division multiple access systems using power control and other methods of controlling the 'near-far problem' have existed for more than 40 years, and have been in production for at least 35 years. (These systems also employed multipath mitigation methods that allowed them to operate in both high speed aircraft and tropo scatter applications). This paper examines the fact that power control CDMA was specifically rejected for use in mobile, aircraft and satellite systems, in favor of other methods that perform better and are more robust in the presence of other systems.
Robert C. Dixon,
"Myths and realities in code-division multiple access (CDMA)", Proc. SPIE 2601, Wireless Data Transmission, (8 December 1995); doi: 10.1117/12.228154; https://doi.org/10.1117/12.228154