TR2007-066

On the Fundamentally Asynchronous Nature of Interference in Cooperative Base Station Systems


    •  Hongyuan Zhang, Neelesh Mehta, Andreas Molisch, Jin Zhang, Huaiyu Dai, "On the Fundamentally Asynchronous Nature of Interference in Cooperative Base Station Systems", Tech. Rep. TR2007-066, Mitsubishi Electric Research Laboratories, Cambridge, MA, August 2007.
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      • @techreport{MERL_TR2007-066,
      • author = {Hongyuan Zhang and Neelesh Mehta and Andreas Molisch and Jin Zhang and Huaiyu Dai},
      • title = {On the Fundamentally Asynchronous Nature of Interference in Cooperative Base Station Systems},
      • institution = {MERL - Mitsubishi Electric Research Laboratories},
      • address = {Cambridge, MA 02139},
      • number = {TR2007-066},
      • month = aug,
      • year = 2007,
      • url = {http://www.merl.com/publications/TR2007-066/}
      • }
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  • Research Areas:

    Electronics & Communications, Wireless Communications


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.