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1.      报告题目 I：

2.      报告人：A/Professor Jinhong Yuan

3.      时间：2008年11月18日 (星期二) 下午2:00 – 3:00

4.      地点：浙江大学、信息科学与电子工程系、信电楼415学术厅

 

In the talk, we first present a new decode and forward scheme with soft information relaying technique to overcome the performance degradation happening when the quality of the inter-user channel is very bad. Based on the scheme, soft log-likelihood ratio of the relay decoder is quantized, encoded, superimposed modulated and then forwarded to the destination. The destination receiver employs an iterative superposition decoder and modified maximum a posteriori probability decoder to recover the transmitted signal from the source. We show that the new scheme can significantly outperform the conventional decode and forward scheme even in a very poor inter-user channel. We then present a new superposition modulation-based cooperative diversity scheme and investigate receivers with iterative detection and decoding (IDD) for the cooperative transmission strategy. For quasi-static fading environment, we analyze the bit-error-rate (BER) performance of the proposed scheme. We show analytically the optimal power allocation for the transmission strategy with iterative detection and decoding.

 

Jinhong Yuan received the BE and PhD degrees in 1991 and 1996, respectively, in Telecommunications. He was a research fellow at the University of Sydney, Australia, from 1997-2000. Since 2000 he has been with School of Electrical Engineering and Telecommunications, the University of New South Wales, Sydney, Australia, where he is now an associate professor, and Director of wireless communications research lab. His research interests include wireless broadband communications, mobile cellular communications, communications system architectures, receiver designs, channel coding/decoding, MIMO OFDM and WCDMA.  Dr Yuan has worked on a number of projects in wireless and mobile communications sponsored by governments and industries, such as Australian Government, French Government, Chinese Government, Ericsson, NEC, Nortel Networks, Agere, Lucent Technologies, Korean ETRI, CSIRO, etc. 

Dr Yuan has published two books, two book chapters, more than one hundred papers in IEEE journals and conference proceedings, over 30 industrial technical reports and one US patent. He has chaired or been on the advisory committee / technique committee for several international conferences and workshops, including ICC, GLOBECOM, VTC, ICCS, APCC, ICCT, PIMRC, etc. He has been invited to present tutorials on space-time coding and MIMO techniques for various conferences.

 

 

1.      报告题目 II ：Whisper of Radio – Spectrum Sharing in Cognitive Radio Networks

2.      报告人：Dr. Wei Zhang

3.      时间：2008年11月18日 (星期二) 下午3:00 – 4:00

4.      地点：浙江大学、信息科学与电子工程学系、信电楼415学术厅

 

Cognitive radio is an agile radio technology which has the potential of dealing with the stringent requirement and scarcity of the radio spectrum by opportunistically utilizing licensed spectrum. Such a revolutionary technology represents a paradigm shift in the design of wireless systems as it will allow the agile and efficient utilization of radio spectrum by offering distributed terminals or radio cells the ability of spectrum sensing, self-adaptation and spectrum sharing.  In this talk, a multihop relay based spectrum sharing approach, referred to as “whispering radio” is presented to address the problem of spectrum under-utilization. In particular, power control and routing for multihop relay cognitive networks are discussed. Finally, performance benefits of the “whispering radio” are shown.