In order to improve the reliability and efficiency of the full diversity cooperation ( FDC) transmission system,two cooperation-hybrid automatic repeat request ( C-HARQ) schemes are proposed,one is FFC-HARQ ( Fixed-Length Frame Cooperation-Hybrid Automatic Repeat Request) scheme that adopts the strategy of error detection and retransmission to increase the throughput based on the native frame structure of the FDC transmission
system,and the other is VFC-HARQ ( Variable-Length Frame Cooperation-Hybrid Automatic Repeat Request) scheme that changes the frame structure to further improve the throughput. Then,the outage probabilities and throughput performances of the systems respectively adopting VFC-HARQ and FFC-HARQ schemes are investigated based on the state transition model of Markov chain. Simulation results show that,for the FDC transmission system,the adoption of the proposed schemes can not only reduce the outage probability but also improve the throughput,that VFC-HARQ scheme outperforms FFC-HARQ by a throughput gain of 50% at the SNR greater than 20 dB,and that,as compared with the 4-slot program,VFC-HARQ scheme obtains a throughput gain greater 10% at the SNR of 10 dB.