Fig. 9
From: Performance analysis of partial transmission cooperative strategy with unreliable relays
Outage probability versus channel gain between relay and destination without direct link. The figure shows that the simulations on outage probability versus SNR of partial transmission (PT) and three conventional cooperative strategies, direction transmission (DT), selective decode-and-forward (SDF), and amplify-and-decode (AF) without the existence of direct link, on the situations with one-relaying system and two-relaying system. To simulate the unreliable relays, the simulation parameters are set as: the number of information bits is 100,000; the transmission rate of information is 0.5b/s/Hz; the channel states from relays to destination is set as 0.2, and those from source to relays and source to destination are set the same, as 0.1. At low SNR, Fig. 9 shows none of the mentioned strategies are reliable. As SNR increases, the improvements of PT are more obvious without direct link. Certainly, the existence of the direct link helps to gain more spatial diversity gain, which can be seen when compared to Fig. 5