Direct sequence CDMA receiver having a delay profile producer with an interpolation function

摘要

A direct sequence CDMA receiver is disclosed that includes an interpolative delay profile production unit. An A/D converter receives signals that have been received by an antenna and converted to a baseband signal and samples the signals at twice the chip rate. A matched filter finds correlation values with the received data using a spreading code of 1/−1, and the delay profile production means interpolates these correlation values by means of, for example, a filter. A timing detector selects delay profiles in descending order of size, and extracts the timings of each. A despreader interpolates the spreading code to synchronize with the timing signals, and using these interpolated values carries out despreading of the received data. A mixer carries out RAKE/diversity mixing of the despread signals.