Patent Document ID: 20060062284
Application ID: 10474192
Patent Flag: 0

Claim One:
1. A method for estimating flat fading channel in CDMA communication system, wherein: it is implemented with adaptive lattice filter-based adaptive, forward prediction technique and maximum likelihood detection technique of Viterbi algorithm, said adaptive lattice filter is used to predict channel fading according to LS rule, said maximum likelihood detection technique is used to perform Viterbi algorithm according to the value of predicted channel fading, and thus estimation and determination for transmitted signal is finished, said method comprising the following steps: a. input despreaded channel signals to adaptive lattice filter of the receiver to calculate the estimated value of received signals corresponding to the node at time n; b. add together measurement results of branch metrics corresponding to the transmission paths to obtain the survived paths at time n; c. demodulate the signal estimation result obtained from the survived paths according to corresponding received signals to obtain estimated value of channel fading at time n; d. adjust coefficient of the adaptive filter, and then estimate the channel at time n+1; e. repeat steps a˜d till all survived paths converge into one path at the pilot symbol of the time slot, the phase corresponding to the nodes in said path is the phase estimation result for the transmitted signals.