| 摘要 |
PURPOSE: To reduce the current consumption of the hardware by controlling number of taps of an adaptive filter used to synthesize multi-path signals in the CDMA system mobile communication equpment. CONSTITUTION: Received data 1 are A/D-converted by an A/D converter section 2, in which the data converted into digital signals in several bits each and a matched filter 3 applies inverse spread processing to the converted data. A reception level detector 7 takes a square sum of an output from the matched filter 3 to average it thereby detecting a reception level. The detected reception level is given to a tap controller 8, in which the quantity of dispersion in delay is estimated depending on the reception level so as to decide number of taps of an adaptive filter 6. Plural delayed waves being outputs of the matched filter 3 are given to the adaptive filter 6, only the required taps are operated based on a control signal from the tap controller 8, a transmission line is estimated by an adaptive algorithm by using a training signal and a desired wave component and an interference wave component are separated. The signals are synthesized and recovered data 5 are provided as an output. |
