Canonical space-time processing in CDMA systems

Eko N. Onggosanusi, Akbar M. Sayeed, and Barry D. Van Veen Department of Electrical and Computer Engineering University of Wisconsin{Madison Madison, WI 53706 fonggo,akbar,[email protected] Submitted to ICASSP'99 ABSTRACT We propose a canonical space-time receiver structure for wireless communications based on front-end processing with respect to a xed basis that is independent of the true channel parameters. The basis is dictated by a canonical characterization of channel propagation dynamics in terms of discrete multipath delays, Doppler shifts, and directions of arrival that capture the essential degrees of freedom in the received signal. In addition to dramatically reducing the number of channel parameters to be estimated, performance analysis demonstrates that canonical space-time receivers can deliver optimal performance at substantially reduced complexity compared to existing designs.