A canonical space-time characterization of mobile wireless channels

A canonical space-time characterization of mobile wireless channels is intr oduced in terms of a fixed basis that is in dependent of the true channel p arameters. The basis captures the essential degrees of freedom in the recei ved signal using discrete multipath delays, Doppler shifts, and directions of arrival, This provides a robust representation of the propagation dynami cs and dramatically reduces the number of channel parameters to be estimate d. The resulting canonical space-time receivers deliver optimal performance at substantially reduced complexity compared to existing designs.