Cooperative communication system and method

This invention discloses a cooperative communication system and method which are used to solve the problem of high peak-average-power-ratio (PAPR) of the conventional communication system. The cooperative communication system is constructed by a source end coupling to a relay end and a destination end, with the relay end coupling to the destination end. The signal transmission process between the source end, the relay end, and the destination end is divided into a first interval and a second interval. Within the first interval, the source end transmits two source signals to the relay end, after a mixing signal mixed from the two source signals is received by the relay end, the relay rotates a phase of the mixing signal to generate a phase-translated signal. Within the second interval, the source end transmits the two source signals to the destination end, in the same time, the relay end transmits the phase-translated signal to the destination end, and the destination end executes a decoding process based on t