CHANNEL ESTIMATING APPARATUS AND METHOD THEREOF

摘要

PURPOSE: A channel estimating apparatus and a method thereof are provided to prevent delay in discriminating a power control bit, control a closed loop power more accurately, and enhance a performance of a channel compensation by using a predicted value in estimating a channel. CONSTITUTION: A PCB(Power Control Bit) signal of a received pilot signal identifies the received signal, is signal-processed in a pre-processing and inputted as one signal. The pre-processed signal is divided into two outputs, one of which is inputted to a PCB detector(107) and the other is inputted to a first mixer(109). The first mixer(109) mixes the pre-processed signal and an output signal of a switch(111) and outputs the mixed signal to an FIR(Finite Impulse Response) filter. The switch(111) outputs 0 , 1 or one of output signals of a processor(400). Then, an FIR filer(300) takes and outputs an average value of multiple symbols. The FIR filer(300) includes a predictor(200). The predictor(200) is formed as an LLR(Log Likelihood Ratio) filter and serves to receive the power control bit coherently. The predictor(200) also serves as a channel estimator.