| 摘要 |
PURPOSE:To reduce deterioration of phasing distortion compensation due to noise by averaging the addition of a reception pilot symbol in calculating the phasing distortion. CONSTITUTION:A 4 multi sub-carrier 16 QAM signal with a pilot symbol inserted is inputted from an input terminal 1 of a receiver and converted into a digital signal, and then stored in memories 9 and 10 by one slot and divided into four types of sub-carrier by a separation circuit 11. A phasing distortion detection circuit 12 takes out a reception pilot symbol from the sub-carrier data arrangement to combine them, and then adds the reception pilot symbol inserted at the same time by ch, dividing the addition value by 2 of the sub- carrier number to obtain the average. Then, the phasing amount is calculated based on the average value. A phasing distortion waveform estimating circuit 13 performs the interpolation of the one-system phasing distortion data inputted from the circuit 12, and outputs them. |
