CHANNEL ESTIMATION DEVICE, AND CDMA RECEIVER AND CDMA TRANSMITTER/RECEIVER HAVING THE DEVICE

摘要

A channel estimation device which performs channel estimation with a high precision and a CDMA receiver and a CDMA transmitter/receiver which have the channel estimation device. The channel estimation values of data symbols are obtained from pilot symbols of a synthesized symbol sequence which has a plurality of slots and includes data symbols and pilot symbols. First, the positions of the pilot symbols in the synthesized symbol sequence are found. Then, the pilot symbols are taken out of the synthesized symbol sequence through two or more slots to produce a pilot block. The average values of the pilot symbols included in the pilot block are appropriately weighted and summed up to obtain the channel estimation values of the data symbols. The weighted summing is performed by using appropriate weights for the data symbols in one slot. With this constitution, the channel estimation with a high precision can be realized.