Abstract:In traditional wireless communication, due to the interference of the external environment and channel instability, the outage probability of network is high. The communication performance is poor under bad channel condition. In this paper, the network performance is improved through the cooperation among wireless nodes. The performance of wireless channel is enhanced in direct transmission through relay of different nodes(amplification, decoding, or the network coding). The network outage probability is reduced with the use of decode-forward and network coding forward. The proper forward method can be found by the comparison of the outage probability under different spectral efficiencies. Simulation results indicate if the spectral efficiency is less than some certain value, the performance of amplify-forward and network coding forward are much better than that of direct transmission.