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Summary: IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, VOL. 7, NO. 5, MAY 2008 1917
Low Complexity and Fractional Coded Cooperation
for Wireless Networks
Andrew W. Eckford, Member, IEEE, Josephine P. K. Chu, Student Member, IEEE,
and Raviraj S. Adve, Senior Member, IEEE
Abstract-- 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,
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