ds / fh - cdma system with sendeleitungsregelung

摘要

A base station (51) transmits a first signal spread according to a direct spread scheme and having carrier frequencies hopped between two frequencies f1 and f2. In a mobile station (71), output signals of two carrier generators (88, 89) are changed over by a change-over switch (90). When the signal transmission frequency in the base station (51) is f1, the mobile station (71) receives the first signal having the frequency f1 and transmits a second signal having the frequency f2. When the signal transmission frequency in the base station (51) is f2, the mobile station (71) receives the first signal having the frequency f2 and transmits the second signal having the frequency f1. A received power level detector (77) in the mobile station (71) detects a power level of the first signal received during each hop (the duration of the same frequency), and, on the basis of the detected power level, a transmission power level control circuit (84) controls the power level of the second signal to be transmitted during the next hop, that is, at the time of transmission of the second signal having the same carrier frequency as that of the first signal whose power level has been detected. IMAGE