澳大利亚 新南威尔士大学
(The
电子工程与通信学院
(School of Electrical Engineering & Telecommunications)
Jinhong Yuan 教授 暨Wei Zhang博士学术报告会
1. 报告题目 I:
Cooperative Transmission Schemes with Soft-information Relaying and Superposition Modulation
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
Abstract:
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.
Biography:
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
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
Abstract:
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.
Biography: