Skip to main content
Fig. 5 | EURASIP Journal on Wireless Communications and Networking

Fig. 5

From: Performance analysis of partial transmission cooperative strategy with unreliable relays

Fig. 5

Outage probability versus signal-to-noise ratio. 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) with 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; all the channel states from source to relays, relays to destination and source to destination are set the same, as 0.1. It can be seen in Fig. 5 that PT performs slightly worse than that of SDF before ρ = 24 dB when M = 1, because in the poor channels, the relay can hardly help the decoding at destination. After, PT gets the lower outage probability compared with SDF. Because as SNR increases, the relay can transmit more information block in PT, while SDF still has high probability failing to decode at the relay. When M = 2, PT gets better performance over the conventional strategies, because two relays can get double spatial diversity than that of the situation with M = 1. As SNR increases, the improvement of PT gets bigger. It is also noted that at low SNR, more relays cost more power and bandwidth, but they are unable to help the destination in such a low channel gain of S-R links

Back to article page