Using the Bhattacharyya parameter for design and analysis of cooperative wireless systems
IEEE Transactions on Wireless Communications
Diversity analysis of irregular fractional cooperation
ISIT'09 Proceedings of the 2009 IEEE international conference on Symposium on Information Theory - Volume 1
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Optimization for fractional cooperation in multiple-source multiple-relay systems
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
EURASIP Journal on Wireless Communications and Networking
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Wireless networks, and especially wireless sensor networks, have complexity and energy constraints, within which they must confront the challenging wireless fading environment. In this paper, fractional cooperation is introduced, which is shown to provide energy-efficient and low-complexity diversity gains for constant energy costs per bit throughout the network. To minimize complexity, cooperation is based on demodulate- and-forward, wherein the relay nodes encode demodulated, not decoded symbols. A scheme is presented for cooperative error- control coding in complexity-constrained networks, using low- density generator-matrix codes and repeat-accumulate codes, both chosen for being simple to encode, as well as for their easily adaptable rates. It is shown that these codes, coupled with fractional cooperation, are robust to system parameters and conditions, and introduce little added complexity at the receiver, while providing excellent performance.