84 Green Relay Techniques in Cellular Systems
3.3.3 Insights and Discussions
We provide some results for the proposed strategies and compare their per-
formance with some benchmark ones. The maximum retransmission limit L
is set to 4. The benchmark strategies and their abbreviations are listed as
follows:
1. H-ARQ with direct transmission (DT ): The relay keeps silent through-
out the transmission.
2. H-ARQ-Relaying with the co-located relay and destination (CRD): We
assume that the relay and the destination are connected by a wire such
that full receive diversity is achieved.
3. H-ARQ-Relaying with conventional DF (DF ): When the relay detects
errors, it keeps silent during phase 2; otherwise, the relay and the source
transmit simultaneously.
4. H
2
-ARQ-Rela ...