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Towards a Scalable C-RAN PHY

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Featured by centralized processing and cloud based infrastructure, Cloud Radio Access Network (C-RAN) is a promising solution to achieve unprecedented system capacity in future wireless cellular networks. The huge capacity gain comes from the centralized and coordinated signal processing at the cloud server. However, full-scale coordination in a large-scale C-RAN requires the processing of very large channel matrices, leading to high computational complexity and channel estimation overhead. In this talk, we exploit the near-sparsity of large C-RAN channel matrices, and derive a unified theoretical framework for clustering and parallel processing. Based on the framework, we propose a dynamic nested clustering (DNC) algorithm that not only greatly improves the system scalability in terms of baseband-processing and channel-estimation complexity, but also is amenable to various parallel processing strategies for different data center architectures.

Bio: Angela Yingjun Zhang received her PhD degree in Electrical and Electronic Engineering from the Hong Kong University of Science and Technology, Hong Kong in 2004. Since 2005, she has been with Department of Information Engineering, The Chinese University of Hong Kong, where she is currently an Associate Professor. Her current research interests are mainly focused on wireless communications systems and smart power systems, in particular optimization techniques for such systems.

Dr. Zhang is an Executive Editor of IEEE Trans. on Wireless Communications and an Associate Editor of IEEE Trans. on Communications. Previously, she served many years as an Associate Editor of IEEE Trans. on Wireless Communications and Wiley Security and Communications Networks Journal, and a Guest Editor of a Feature Topic in IEEE Communications Magazine. She has actively served on program committees for many conferences.

Dr. Zhang is a co-recipient of 2014 IEEE ComSoc APB Outstanding Paper Award, 2013 IEEE SmartgridComm Best Paper Award, and 2011 IEEE Marconi Prize Paper Award on Wireless Communications. She received the Young Researcher Award from The Chinese University of Hong Kong in 2011. As the only winner from Engineering Science, she has won the Hong Kong Young Scientist Award 2006, conferred by the Hong Kong Institution of Science.

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