| 摘要 |
Known are time division multiple access digital transmission systems (1), like a TDMA GSM mobile radio system, in which mobile radio stations (MS1, MS2, MS3) synchronise to a radio base station (BS1, BS2, BS3). In such mobile radio stations (MS1, MS2, MS3), various clocks (tc1, dc1) are necessary, such as for burst sampling and speech sampling. In such mobile radio stations (MS1, MS2, MS3), due to various causes, the clock systems may slip with respect to each other, an excessive slip causing loss of data. Known mobiles, e.g. with independently controlled clock systems, may show such unacceptable data loss, or require complicated hardware. A time division multiple access digital transmission system (1) is provided in which in the mobiles (MS1, MS2, MS3) the various clock systems are derived from the same reference clock signal generator (20) which is controlled with an adjustment signal (adj) which is a function of at least a derivate (TOId) of a determined time delay (TOI) between a received time slot position and an expected time slot position. Preferably, the control function also includes a mean (TOIm) of the determined delay. |
