Method and apparatus for identification of transmission antenna diversity in a receiver

1. A method for identification of a multiple antenna transmission mode in a radio receiver, comprising:

producing at least two antenna-decoupled data streams in the receiver from a received data signal;

calculating in the radio receiver a respective first variable for each of the at least two data streams, wherein the first variables are each dependent on a phase difference between successive data items in the respective data stream, wherein the successive data items are successive with respect to one another in the time domain; and

evaluating the first variables to decide whether the multiple antenna transmission mode is being used in a transmitter that produced the data signal, wherein the decision is dependent on the phase difference between the successive data items in each of the at least two data streams.

2. A method for identification of a multiple antenna transmission mode in a radio receiver, comprising:

producing at least two antenna-decoupled data streams in the receiver from a received data signal;

calculating in the radio receiver a respective first variable for each of the at least two data streams, wherein the first variables are each dependent on a phase difference between successive data items in the respective data stream, wherein the successive data items are successive with respect to one another in the time domain; and

evaluating the first variables to decide whether the multiple antenna transmission mode is being used in a transmitter that produced the data signal, wherein the decision is dependent on the phase difference between the successive data items in each of the at least two data streams,

wherein an argument of a complex number depending on the first variables indicates the phase difference between the successive data items in the respective data stream.

3. A method for identification of a multiple antenna transmission mode in a radio receiver, comprising:

producing at least two antenna-decoupled data streams in the receiver from a received data signal;

calculating in the radio receiver a respective first variable for each of the at least two data streams, wherein the first variables are each dependent on a phase difference between successive data items in the respective data stream, wherein the successive data items are successive with respect to one another in the time domain; and

evaluating the first variables to decide whether the multiple antenna transmission mode is being used in a transmitter that produced the data signal, wherein the decision is dependent on the phase difference between the successive data items in each of the at least two data streams,

wherein a magnitude of the first variables represents a measure of the signal strength in the respective data stream.

4. A method for identification of a multiple antenna transmission mode in a radio receiver, comprising:

producing at least two antenna-decoupled data streams in the receiver from a received data signal;

calculating in the radio receiver a respective first variable for each of the at least two data streams, wherein the first variables are each dependent on a phase change between the data in the respective data stream and, wherein the first variable for the a-th antenna-decoupled data stream is given by the relationship: p a (2i)=s a (i)·S a *(i+1), where s a (i) represents a data value relating to a time index “i” of the a-th antenna-decoupled data stream, wherein a=0, 1; and

evaluating the first variables to decide whether the multiple antenna transmission mode is being used in a transmitter that produced the data signal, wherein the decision is dependent on the phase change between the data in each of the at least two data streams.

5. A method for identification of a multiple antenna transmission mode in a radio receiver, comprising:

producing at least two antenna-decoupled data streams in the receiver from a received data signal;

calculating in the radio receiver a respective first variable for each of the at least two data streams, wherein the first variables are each dependent on a phase change between the data in the respective data stream; and

evaluating the first variables to decide whether the multiple antenna transmission mode is being used in a transmitter that produced the data signal, wherein the decision is dependent on the phase change between the data in each of the at least two data streams, and wherein evaluating the first variables comprises:

calculating a second variable that is dependent on a phase relationship between the first variables; and

deciding whether a multiple antenna transmission mode is being used in the transmitter based on the calculated second variable.

6. The method according to claim 5 , wherein the second variable comprises a product of the first variable, which is calculated for one data stream, and a complex-conjugate of the first variable, which is calculated for the other data stream, and wherein a decision is made that a multiple antenna transmission mode is present if a real part of the second variable is greater than or equal to zero.

7. A method for identification of a multiple antenna transmission mode in a radio receiver, comprising:

producing at least two antenna-decoupled data streams in the receiver from a received data signal;

calculating in the radio receiver a respective first variable for each of the at least two data streams, wherein the first variables are each dependent on a phase change between the data in the respective data stream; and

evaluating the first variables to decide whether the multiple antenna transmission mode is being used in a transmitter that produced the data signal, wherein the decision is dependent on the phase change between the data in each of the at least two data streams, and wherein evaluating the first variables comprises:

comparing a magnitude of the first variable associated with the first data stream which is characteristic of the signal power of the first transmission antenna and a magnitude of the first variable associated with the second data stream which is characteristic of the signal power of the second transmission antenna to a threshold value; and

deciding that a multiple antenna transmission mode is not present when at least one of the magnitudes which are characteristic of the signal power of the transmission antennas is or are less than the threshold value.

8. A method for identification of a multiple antenna transmission mode based on a received data signal in a radio receiver, wherein the received data signal is transmitted from a transmitter that coded the data signal using a scrambling code, comprising:

producing at least two antenna-decoupled data streams in the receiver from the received data signal;

calculating in the radio receiver a respective first variable for each of the at least two data streams, wherein the first variables are each dependent on a phase change between the data in the respective data stream;

evaluating the first variables to decide whether the multiple antenna transmission mode is being used in the transmitter that produced the data signal, wherein the decision is dependent on the phase change between the data in each of the at least two data streams; and

identifying the transmitted scrambling code in the receiver by evaluating at least one of the two first variables, wherein the scrambling code is identified as a function of only one of the two first variables in a first identification mode, and the scrambling code is identified as a function of both first variables in a second identification mode.

9. An apparatus for identification of a multiple antenna transmission mode in a radio receiver, comprising:

an antenna decoupling unit configured to produce at least two antenna-decoupled data streams from a received data signal;

a calculation unit within the radio receiver, the calculation unit configured to receive the at least two antenna-decoupled data streams and calculate a first variable for each of the at least two data streams, wherein each first variable is dependent on a phase difference between successive data items in the respective data stream, wherein the successive data items are successive with respect to one another in the time domain; and

an evaluation unit configured to receive the first variables and decide as a function of the first variables whether a multiple antenna transmission mode is being used in a transmitter that produced the data signal, wherein the decision is dependent on the phase difference between the successive data items in each of the at least two data streams.

10. An apparatus for identification of a multiple antenna transmission mode in a radio receiver, comprising:

an antenna decoupling unit configured to produce at least two antenna-decoupled data streams from a received data signal;

a calculation unit within the radio receiver, the calculation unit configured to receive the at least two antenna-decoupled data streams and calculate a first variable for each of the at least two data streams, wherein each first variable is dependent on a phase change between the data in the respective data stream and wherein the first variable for an a-th antenna-decoupled data stream is given by the relationship p a (2i)=s a (i)·S a *(i+1), where s a (i) represents a data value relating to the time index “i” of the a-th antenna-decoupled data stream, wherein a=0, 1;

an evaluation unit configured to receive the first variables and decide as a function of the first variables whether a multiple antenna transmission mode is being used in a transmitter that produced the data signal, wherein the decision is dependent on the phase change in each of the at least two data streams.

11. An apparatus for identification of a multiple antenna transmission mode in a radio receiver, comprising:

an antenna decoupling unit configured to produce at least two antenna-decoupled data streams from a received data signal;

a calculation unit within the radio receiver, the calculation unit configured to receive the at least two antenna-decoupled data streams and calculate a first variable for each of the at least two data streams, wherein each first variable is dependent on a phase change between the data in the respective data stream;

wherein the calculation unit is configured to calculate a second variable, which is dependent on a phase relationship between the two first variables; and

an evaluation unit configured to receive the first variables and decide as a function of the first variables whether a multiple antenna transmission mode is being used in a transmitter that produced the data signal, wherein the decision is dependent on the phase change in each of the at least two data streams; and wherein the evaluation unit is configured to decide as a function of the calculated second variable whether a multiple antenna transmission mode is being used in the transmitter.

12. The apparatus according to claim 11 , wherein the calculation unit is further configured to calculate a product of the first variable calculated for one data stream, and a complex-conjugate of the first variable calculated for the other data stream, and decide that a multiple antenna transmission mode is present if a real part of the second variable is greater than or equal to zero.

13. An apparatus for identification of a multiple antenna transmission mode in a radio receiver, comprising:

an antenna decoupling unit configured to produce at least two antenna-decoupled data streams from a received data signal;

a calculation unit within the radio receiver, the calculation unit configured to receive the at least two antenna-decoupled data streams and calculate a first variable for each of the at least two data streams, wherein each first variable is dependent on a phase change between the data in the respective data stream; and

an evaluation unit configured to receive the first variables and decide as a function of the first variables whether a multiple antenna transmission mode is being used in a transmitter that produced the data signal, wherein the decision is dependent on the phase change in each of the at least two data streams;

wherein the evaluation unit is further configured to compare a magnitude of the first variable which is associated with the first data stream which is characteristic of the signal power of a first transmission antenna and a magnitude of the first variable which is associated with the second data stream which is characteristic of the signal power of a second transmission antenna to a threshold value; and

wherein the evaluation unit is configured to decide that a multiple antenna transmission mode is not being used in the transmitter if at least one of the magnitudes which are characteristic of the signal powers of the transmission antennas is or are less than the threshold value.

14. An apparatus for identification of a multiple antenna transmission mode in a radio receiver, comprising:

an antenna decoupling unit configured to produce at least two antenna-decoupled data streams from a received data signal;

a calculation unit within the radio receiver, the calculation unit configured to receive the at least two antenna-decoupled data streams and calculate a first variable for each of the at least two data streams, wherein each first variable is dependent on a phase change between the data in the respective data stream; and

an evaluation unit configured to receive the first variables and decide as a function of the first variables whether a multiple antenna transmission mode is being used in a transmitter that produced the data signal, wherein the decision is dependent on the phase change in each of the at least two data streams;

a further evaluation unit connected downstream from the calculation unit, and configured to evaluate at least one of the two first variables to identify a scrambling code which is being used by the transmitter for the coding of the transmitted data signal, wherein the further evaluation unit is configured to be operated in two or more identification modes, wherein the scrambling code is identified as a function of only one of the two first variables in a first identification mode, and the scrambling code is identified as a function of both first variables in a second identification mode.