| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a CDMA demodulator that can estimate and compensate fluctuations in transfer paths with higher accuracy. SOLUTION: A memory 3 stores a received data sequence subjected to inverse spread processing with a symbol period. A slot synchronization detection section 4 detects a position of a pilot symbol, and a pilot symbol averaging section 5 uses this position detection timing and averages reception channels denoted by pilot symbols in each pilot block to obtain a channel estimate value by each pilot block. A delay section 6 arranges the timings of the estimated channel information and a pilot block transmission channel estimate section 8 applies weighted sum to each channel estimate value. In this case, a weight decision section 7 controls a weight coefficient depending on a transmission channel state. A transmission channel fluctuation compensation section 10 uses the channel estimate value obtained by the plurality of pilot block transmission channel estimate section 8 to compensate the fluctuations in the transmission channel of each information symbol at an n-th slot.</p> |
