For an ISAC base station serving K users and estimating L parameters, at most K + sqrt(L(L+1)/2) beamformers are needed if users cancel sensing interference, and at most sqrt(K^2 + L(L+1)/2) if they cannot.
Bounds on the minimum number of beam- formers for integrated sensing and communications,
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How Many Simultaneous Beamformers are Needed for Integrated Sensing and Communications?
For an ISAC base station serving K users and estimating L parameters, at most K + sqrt(L(L+1)/2) beamformers are needed if users cancel sensing interference, and at most sqrt(K^2 + L(L+1)/2) if they cannot.