
48 Energy-Efficient Cooperative Wireless Communication and Networks
200 400 600 800 1000
10
2
10
3
10
4
10
5
Packet length (nat)
Minimum delay (unit time)
Amplify-Forward
Direct transmission
Decode-Forward
Multi-Hop
FIGURE 5.1 Minimum link delay versus the original packet in different
length (L).
Figure 5.1, all three cooperative protocols achieve much better performance
than direct transmission (non-cooperative). Especially, DAF outperforms the
two others when SNR remains at a low level. The average delay reductions
are
34.19% (AF), 70.57% (MH), and 79.96% (DAF), compared with direct
transmission, respectively.
5.3 DELAY ANALYSIS FOR MULTI-HOP SCENARIO
Based on