Design And Realization Of File Transfer Protocol For Short-wave Communication System

This thesis is concerned with the file transfer protocol for short-wave communication system. Since some equipments used in the system are not always full duplex, we developed a novel link control protocol-dynamic sliding window protocol, which is adaptive to both of the half-duplex and full-duplex communications. This algorithm extracts the virtue of Stop-and-Wait protocol and Sliding Window protocol, uses acknowledgements and timeouts to implement reliability, and changes sliding window size according to channel quality. The thesis puts forward the techniques of this file transfer protocol, and lays stress on the idea and the model of dynamic sliding window protocol. The thesis also gives out the realization of the whole file transfer protocol.When the short-wave communication system adopting this file transfer protocol works in half-duplex or full-duplex communication link, it has such virtue as high performance and high speed. Compared to the case using Wait-and-Stop, the efficiency of the file transfer protocol using dynamic sliding window is head and shoulders above.