1. A method for determining link level performance in a communication system, comprising: determining, in a first cellular network element, an instantaneous detection metric for one or more given wireless access channel coefficients representing a plurality of wireless access channel realizations, the determining of the instantaneous detection metric being a function of a spatial processing result from subjecting the access channel to spatial processing in order to simulate actual system performance, wherein spatial processing involves the processing of multiple antenna clusters, the clusters including multiple antennas per cluster, to determine an angle-of-arrival with appropriate antenna weights; selecting, in a second cellular network element, a conditional detection probability based on the determined detection metric; and calculating, in a third cellular network element, a link level performance result based on the selected conditional detection probability.