Method of regulating the transmission power of a master station and a slave station for implementation of the method

1. A method of regulating a transmission power of a master station in a transmission system as a function of an estimate of a signal/interference ratio in a slave station, comprising:

separating a plurality of useful signals assigned to different communicating subscribers via orthogonal codes in the transmission system;

in accordance with a selected one of the orthogonal codes, deriving a useful signal assigned to one of the different communicating subscribers from a signal received at least in the slave station from the master station, wherein the deriving of the useful signal from the received signal includes:

despreading the received signal in accordance with a selected one of the orthogonal codes to produce a despread signal;

subjecting the despread signal to data detection to produce a detected signal; and

forming the useful signal by spreading the detected signal in accordance with the selected one of the orthogonal codes; and

comparing the useful signal as a reference signal to the received signal in order to estimate the signal/interference ratio.

2. The method according to claim 1 , wherein the transmission system includes a code division multiple access transmission system.

3. The method according to claim 1 , further comprising:

predistorting in the master station a signal to be transmitted at least from the master station to the slave station by a joint predistortion method in the master station.

4. The method according to claim 1 , further comprising:

modulating a signal to be transmitted at least from the master station to the slave station by a quadrature phase shift keying method.

5. A slave station, comprising:

an arrangement for receiving signals from at least one master station in a transmission system, a plurality of useful signals assigned to different communicating subscribers being separated from one another via orthogonal codes;

an arrangement for deriving a useful signal assigned to one of the different communicating subscribers in accordance with a selected one of the orthogonal codes, the derived useful signal forming a reference signal, wherein the arrangement for deriving the useful signal includes:

a despreading device to despread a received signal in accordance with a selected one of the orthogonal codes to produce a despread signal;

a data detector to detect a data signal from the despread signal; and

a spreading device to respread the detected data signal with the selected one of the orthogonal codes to derive the useful signal forming the reference signal;

a first comparison arrangement for comparing the reference signal to the received signal in order to estimate a signal/interference ratio;

a second comparison arrangement for comparing the estimated signal/interference ratio to a selected signal/interference ratio to generate a result; and

a transmission arrangement for transmitting a signal to the at least one master station to control a transmission power of the at least one master station so that the estimated signal/interference ratio approximates the selected signal/interference ratio, the signal transmitted to the master station being a function of the result.

6. The slave station according to claim 5 , wherein the transmission system includes a CDMA transmission system.

7. The slave station according to claim 5 , wherein the slave station is configured as a base station of a mobile wireless network.

8. The slave station according to claim 5 , wherein the slave station is configured as a mobile terminal.

9. The slave station according to claim 5 , wherein the slave station is configured as a mobile telephone.