METHOD AND APPARATUS FOR GENERATING AND RECOVERING MULTIPLE-ACCESS SIGNAL IN COMMUNICATION SYSTEM

The present invention relates to a method and an apparatus for generating and recovering a multiple-access signal in a mobile communication system. In order to generate the multiple-access signal according to the present invention, each transmitter transmits information by using all or a portion of given channel resources. At this time, a signal from each transmitter is mapped to an OFDM time-frequency resource space by a trellis modulation path. The mobile communication system according to the present invention allows the trellis modulation path of the plural transmitters to be mapped to the same resource space. According to the present invention, a receiver uses a symbol-by-symbol message passing method and a path linking method in order to effectively detect and discriminate the signals transmitted from the plural transmitters via the same channel resource space. The receiver, for more efficiently recovering the detected signals, uses a state space extending method, a reverse pre-decoding method and a successive interference cancelation method.