TR2008-042
Asynchronous Interference Mitigation in Cooperative Base Station Systems
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- "Asynchronous Interference Mitigation in Cooperative Base Station Systems", IEEE Transactions on Wireless Communications, Vol. 7, No. 1, pp. 155-165, January 2008.BibTeX TR2008-042 PDF
- @article{Zhang2008jan,
- author = {Zhang, H. and Mehta, N.B. and Molisch, A.F. and Zhang, J. and Dai, H.},
- title = {Asynchronous Interference Mitigation in Cooperative Base Station Systems},
- journal = {IEEE Transactions on Wireless Communications},
- year = 2008,
- volume = 7,
- number = 1,
- pages = {155--165},
- month = jan,
- issn = {1536-1276},
- url = {https://www.merl.com/publications/TR2008-042}
- }
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- "Asynchronous Interference Mitigation in Cooperative Base Station Systems", IEEE Transactions on Wireless Communications, Vol. 7, No. 1, pp. 155-165, January 2008.
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MERL Contact:
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Research Area:
Abstract:
Cooperative transmission by base stations (BSs) can significantly improve the spectral efficiency of multiuser, multicell, multiple input multiple output (MIMO) systems. We show that contrary to what is often assumed in the literature, the multiuser interference in such systems is fundamentally asynchronous. Intuitively, perfect timing-advance mechanisms can be best only ensure that the desired signal components - but not also the interference components - are perfectly aligned at their intended mobile stations. We develop an accurate mathematical model for the asynchronicity, and show that it leads to a significant performance degradation of existing designs that ignore the asynchronicity of interference. Using three previously proposed linear precoding design methods for BS cooperation, we develop corresponding algorithms that are better at mitigating the impact of the asynchronicity of the interference. Furthermore, we also address timing-advance inaccuracies (jitter), which are inevitable in a practical system. We show that using jitter-statistics-aware precoders can mitigate the impact of these inaccuracies as well. The insights are critical for the practical implementation of BS cooperation in multiuser MIMO systems, a topic that is typically oversimplified in the literature.
Related News & Events
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NEWS IEEE Transactions on Wireless Communications: 2 publications by Jinyun Zhang and others Date: January 15, 2008
Where: IEEE Transactions on Wireless Communications
MERL Contact: Jinyun ZhangBrief- The articles "Asynchronous Interference Mitigation in Cooperative Base Station Systems" by Zhang, H., Mehta, N.B., Molisch, A.F., Zhang, J. and Dai, H. and "A Software-Defined Radio System for Backscatter Sensor Networks" by Vannucci, G., Bletsas, A. and Leigh, D. were published in IEEE Transactions on Wireless Communications.