Fig. 7

Outage probability versus channel gain between relay and destination with one relay. Shows that the simulations on outage probability versus channel gain between relay and destination (R-D) of partial transmission (PT) and three conventional cooperative strategies, direction transmission (DT), selective decode-and-forward (SDF), and amplify-and-decode (AF), on the situations with one-relaying system. To simulate the unreliable relays, the simulation parameters are set as: the number of information bits is 100,000; the transmit SNR of source is 20 dB; other channel states from relays to destination (R-D) and source to destination (S-D) are set the same, as 0.1. The figure shows that PT gets the better performance than the conventional strategies as the R-D channel gain gets better than 0.1. It is also shown that SDF and AF are not able to obtain the spatial diversity gain from the R-D channel, because they are limited by the poor channel ahead of the relay. For SDF, the state of the S-D channel determines the decoding ability of the relay. For PT, although R node fails to decode all the information correctly, the benefit of R-D channel still obtains diversity gain for the destination