New multi-rate detection algorithm for IS-95A CDMA system

Information transmission and detection with different rates are one of the main characteristics in the current and future digital communication systems. In IS-95A CDMA system, the speech encoder has four different rates depending on the speech activities of the speaker. At the receiver, in order to reduce the complexity of the decoder and save the energy, it needs to detect which rate is used, so that it can select one matched decoder to deal with the transmitted signals. In reference [3], an effective multi-rate detection algorithm is presented recently. A new multi-rate detection algorithm is proposed. Compared with that in reference [3], the proposed algorithm has comparable computation complexity and considerable improvement on the total performance of the error rate detection probability under relatively low signal to noise ratio.