METHOD FOR DOUBLE OPPORTUNISTIC TRANSMISSION COOPERATIVE DIVERSITY

摘要

PURPOSE: A DOT(Double Opportunistic Transmission) cooperative diversity method is provided to solve a problem that transmitting power and wireless resources of a system are wasted by limiting the number of transmission relays to prevent a relay which cannot improve the performance of the system from performing transmission from the beginning. CONSTITUTION: A average transmission relay signal is controlled according to a GSC(Generalized Selection Diversity) method to be same as the number of receiving branches of a limited destination. When only a signal having a strong SNR(Signal to Noise Ratio) is selected from received signals to perform the MRC(Maximal Ratio Combining) of the selected signal, the MRC of all inputted signals is performed if the number of the received signals is less than the number of the receiving branches of the destination. If the number of the received signals is more than the number of the receiving branches of the destination, signals having a large SNR among the inputted signals are selected as many as the number of the receiving branches. The MRC of the selected signals is performed.