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...spatial sampling from natural DOAs represented by OE. 3 The proof of this canonical representation is given in Appendix A. An alternate proof based on the finiteness of the array aperture is given in =-=[11]-=-. Figure 2 illustrates the canonical space-time channel coordinates defined by the multipath-Doppler-angle sampling in the above representation. We note that the number of terms in the canonical coord...

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...ng [12, 21] may also be leveraged in fast-fading scenarios to further enhance system performance. Finally, we note that notion of canonical coordinates can be extended to space-time scenarios as well =-=[22, 23]-=-. Acknowledgement The authors would like to acknowledge Prof. L. Scharf, Prof. B. Van Veen and E. Onggosanusi for the useful discussions during the course of this work. Appendix Recall that R ee = g 1...

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...fering from high computational complexity in dense multipath environments, such receivers rely heavily on accurate nonlinear estimation of the delay and DOA parameters of dominant scatterers. In [2], =-=[3]-=- we introduced a canonical characterization of the received signal in terms of the essential degrees of freedom in the channel that are observable at the receiver. These degrees of freedom are capture...

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...dition to suffering from high computational complexity in dense multipath environments, such receivers rely on accurate nonlinear estimation of the delay and DOA parameters of dominant scatterers. In =-=[2, 3]-=-, we introduced the canonical space-time coordinate (CSTC) system, which provides a parsimonious characterization of the received signal in terms of fixed basis corresponding to certain discrete multi...