Possible Use of MIMO/Massive MIMO Technology to Increase Spectrum Access by Controlling Interservice Interference

Abstract

Most wireless technology researchers view obtaining access to spectrum as a specialty for others who focus solely in spectrum policy. Thus, the researcher finds out from others what bands are available for their application. In many cases, the question of whether band x can be used for application <tex>$y$</tex> ultimately depends on whether this application in this band will cause interference to other users in either the same band or nearby bands. This type of problem is usually approached by developing power budgets for both the desired transmitter to desired receiver path as well as from the new band user transmitter to incumbent receiver path and checking what the desired-to-undesired-signal ratios are and whether they will result in harmful interference. Generally, the design of equipment for new spectrum uses has not been greatly influenced by the need to protect incumbent spectrum uses. Rather, spectrum regulators often base use decisions on traditional technology and whether such technology might result in interservice interference to incumbent systems.