Double-repeat signal transmission method based on interference cancellation

The invention provides a dual-relay signal transmission method based on interference elimination, which is applied to a two-bounce dual-relay communication system. A first signal to be transmitted is sent to all node terminals by a source node terminal in a first transmission interval, and all relay node terminals respectively generate a first relay signal after detecting the first signal to be transmitted; then a second signal to be transmitted is sent to a second relay node terminal by the source node terminal in a second transmission interval, and simultaneously, the generated first relay signal is sent to all the node terminals by a first relay node terminal; after detecting the first relay signal, an objective node terminal restores the corresponding first signal to be transmitted, and simultaneously, after detecting signals sent from the source node terminal and the first relay node terminal, the second relay node terminal adopts the method of interference elimination to generate a second relay signal from the detected signal and send the second relay signal to the objective node terminal in a third transmission interval; after detecting the second relay signal, the objective node terminal restores the corresponding second signal to be transmitted. Therefore, two signals can be transmitted in three intervals, and the transmission efficiency is improved.