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In this paper, we investigate the coexistence of a single cell massive MIMOcommunication system with a MIMO radar. We consider the case where the massiveMIMO BS is aware of the radar's existence and treats it as a non-serviced user,but the radar is unaware of the communication system's existence and treats thesignals transmitted by both the BS and the communication users as noise. Usingresults from random matrix theory, we derive the rates achievable by thecommunication system and the radar. We then use these expressions to obtain theachievable rate regions for the proposed joint radar and communications system.We observe that due to the availability of a large number of degrees of freedomat the mMIMO BS, results in minimal interference even without co-design.Finally we corroborate our findings via detailed numerical simulations andverify the validity of the results derived previously under different settings.

MIMO Radars and Massive MIMO Communication Systems can Coexist