Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : Feedback-based adaptive network coded cooperation for wireless networks | Zhang et al. EURASIP Journal on Wireless Communications and Networking 2011 2011 164 EURASIP Journal on . http content 20ii i i64 Wireless Communications and Networking a SpringerOpen Journal RESEARCH Open Access Feedback-based adaptive network coded cooperation for wireless networks Kaibin Zhang1 Liuguo Yin2 and Jianhua Lu1 Abstract A novel feedback-based adaptive network coded cooperation FANCC scheme is proposed for wireless networks that comprise a number of terminals transmitting data to a common destination. The proposed FANCC exploits network coding and matches code-on-graph with network-on-graph which is a substantial extension of adaptive network coded cooperation ANCC . In the relay phase of FANCC the terminal will be active when its channel fading coefficient magnitude h is larger than the threshold Tth and the broadcast-packet of one terminal will be possibly selected for check-sum when h is less than the threshold Rth. In the indication phase the destination broadcasts above message at cost of 2 bits per terminal. Therefore distributed fountain codes are generated at the destination. Both achievable rates and outage probabilities are evaluated for FANCC and closed-form expressions are derived when the network size approaches infinity. Moreover compared with ANCC analysis results demonstrate that FANCC achieves 1-2 dB performance improvement at the outage probability of 10-6 and 1-2 dB gain at the same achievable rate and the simulation results shows that FANCC has better Frame error ratio FER performance. Index Terms-cooperative wireless network network coding fountain codes distributed coding I. Introduction The random fading in wireless networks has posed a fundamental challenge to maintain excellent performance under lossy conditions. User cooperation first discussed by vander Merlrn in 1971 1 involves the deliberate permission of one or more cooperating nodes known as the relays into the conventional point-to-point .
