| On the Fundamentally Asynchronous Nature of Interference in Cooperative Base Station Systems |
| Date: | August 2007 |
| MERL Contacts: | Andreas F. Molisch,
Jinyun Zhang |
| Author: | Hongyuan Zhang, Neelesh Mehta, Andreas Molisch, Jin Zhang, Huaiyu Dai |
| Where Published: | ICC 2007 |
Cooperative transmission by base stations can significantly improve the spectral efficiency of multiuser, multi-cell multiple input multiple output systems. We show that in such systems the multiuser interference is asynchronous by nature, even when perfect timing-advance mechanisms ensure that the desired signal components arrive synchronously. We establish an accurate mathematical model for the asynchronism, and use it to show that the asynchronism leads to a significant performance degradation of existing linear precoding designs that assumed synchronous interference. We consider three different previously proposed designs, and show how to modify them to effectively mitigate asynchronous interference. |
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