A noncoherent CSK communication system with adjustable weights was proposed.Both theoretical analysis and simulation for its BER performance under the environment of multipath channels were studied.The results show that the BER performance of the system is good.When the weights meet certain requirements
the multipath BER performance of the proposed system is identical to that of the DCSK communication system and its AWGN BER performance is better than those of some existing noncoherent CSK communication systems.