Untersuchung leistungsfähiger MIMO-Übertragungsverfahren unter Berücksichtigung realer Kanäle sowie realer Sende- und Empfangshardware
Final Report Abstract
As a conclusion, it is interesting to point out the relation of the work done in this project to the work in the field of coherent space-time coding. Namely, a connection between orthogonal space-time codes and non-coherent codes with special properties (pair wise equiangular packings on Grassmann manifolds) can be established. This on one hand gives the counterpart of orthogonal spacetime codes in the set of non-coherent space-time codes. On the other hand, it gives the possibility of construction of coherent codes based on special non-coherent codes, i.e. packings on Grassmann manifolds with certain properties. The results of this work are also related to other work where similar conclusion can be done following the geometric approach used there. This approach opens the door for future work where the connection between coherent and non-coherent coding will be further analyzed. It is believed that a detailed analysis will show that, at some point, the distinction between the two transmission methods vanishes, and that both fall in one general scheme. Additionally, as already argued, some concepts of space-time coding for MIMO channels can be generalized for wireless networks with relays, where a distributed space-time code is built at the relays. Some of the codes described here seem to be promising candidates for the non-coherent as well as for the coherent scenario.
Publications
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“On Orthogonal Space-Time Codes and Packings on the Grassmann Manifold,” In Proc. GLOBECOM 2006, San Francisco, November 2006
C. Pietsch and J. Lindner
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A Recursive Construction of High-Dimensional Grassmann Space-Time Codes for Non-Coherent MIMO Systems," In Proc. IEEE International Symposium on Information Theory, ISIT 2007, Nice, June 2007
Z. Utkovski and J. Lindner
