| 摘要 |
A data demodulator circuit for spread spectrum communication, presenting improved demodulation characteristics by allowing the elimination of the influence of a carrier offset remaining after down converting, and the removal of the interference caused by pilot signals with different timing. In-phase axis received signal and quadrature axis received signal are provided to data demodulator circuits adapted to operate with their respective reception timing of pilot signal. A phase difference information extracting means extracts phase difference information from the input signals, and delay means delays the received signals so as to ensure that extracted phase difference information is equivalent to the amount of average phase revolution. A frequency and phase compensation means eliminates the influence of the carrier offset by use of thus extracted phase difference information. A data demodulation means with canceler removes an interference IDF of pilot signals with different timing originating from the outputs of an interference amount calculating means. |
