Feedback-based adaptive network coded cooperation for wireless networks
Kaibin Zhang, Liuguo Yin, Jianhua Lü · EURASIP Journal on Wireless Communications and Networking · 2011
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 T th and the broadcast-packet of one terminal will be possibly selected for check-sum when |h| is less than the threshold R th . 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