104 Green Relay Techniques in Cellular Systems
3.5 Conclusion and Future Works
In this chapter, a comprehensive investigation of cooperative communication
systems has been presented and fundamental understanding from both the
theoretical and practical points of view has been achieved. We considered
typical relaying schemes including AF, DF CF, and hybrid schemes and stud-
ied their spectral and energy efficiency performances at both link and system
levels.
Flexible approaches have been taken to combine different forwarding
strategies, enabling the system to efficiently and dynamically adapt itself to
the variations of the channel. The CF/DF based strategy shows significant
improvement in terms of throughput and energy consumption. However, it
should be emphasized ...