
36 Energy-Efficient Cooperative Wireless Communication and Networks
4.3 SUPPLEMENTARY COOPERATION
In this section, we introduce a nother idea of supplementary cooperation strat-
egy. We have focused so far on the conventional cooperation strategy that the
mutual information accumulation only happens at the destination node of
each cooperative link. Actually, the relay node can also get full benefits from
cooperation by taking advantage of the broadcast nature of wireless trans-
mission to further reduce the decoding error. As depicted in Figure 4.2, in
the second time slot, node
C receives the second copy of m
2
from relay B.
At the same time, relay