DECORRELATING RECEIVER FOR ASYNCHRONOUS CDMA CHANNELS

摘要

A communication device (100) utilizes pilot symbols to decorrelate a plurality of CDMA signals without using power control. The received signals are filtered in a matched filter bank (103) and sampled in a sampler (104). A vector of the samples is stored in a memory (107) and the inverse cross correlation matrix is calculated by a computing device (105). The matrix is then multiplied by the energy estimates in a multiplier (108). The result is then subtracted from the vector in a summer (109). The result of the subtraction is multiplied by the inverse correlation matrix in another multiplier (110) in order to decode the signals in a decoder (112). Energy estimates of the plurality of CDMA signals are generated in an energy estimator (111) and given polarities based on the known polarity of the pilot symbols. These estimates are used in the subsequent multiplication of submatrices.