Method and device for diversity transmission of coded information
View Patent ↗A transmit signal is generated with N antenna data signals for emission via N transmitting antennas. A useful data signal X is subjected to channel coding to generated the transmit signal. On the signal path between channel coding and the emission via the transmitting antennas, data rate matching is performed by way of a data rate matching stage which makes it possible that the number N of the transmitting antennas can be predetermined independently of the code rate.
1. A method of generating a transmit signal from a useful data signal, the transmit signal comprising a number of antenna data signals each to be emitted via one of a fixed number of transmitting antennas, the method which comprises:
setting a variable code rate to a given code rate for channel coding;
channel coding the useful data signal with the given code rate; and
data rate matching with a variable rate matching ratio defined by a quotient of an input rate to an output rate on a signal path between the channel coding and an emission of the antenna data signals via the transmitting antennas, with the variable rate matching ratio dependent only on the given code rate.
2. The method according to claim 1 , wherein the data rate matching step comprises one of puncturing and repeating data symbols of the coded data signal.
3. The method according to claim 1 , which further comprises demultiplexing the coded data signal in the signal path between the channel coding and the emission of the antenna data signals via the transmitting antennas.
4. The method according to claim 1 , which further comprises interleaving the coded data signal in the signal path between the channel coding and the emission via the transmitting antennas.
5. The method according to claim 1 , wherein the channel coding step comprises turbo coding the useful data signal.
6. A method of generating a transmit signal from a useful data signal, the transmit signal including a number of antenna data signals each to be emitted via one of a fixed number of transmitting antennas, the method which comprises:
setting a variable code rate to a given code rate for channel coding;
channel coding the useful data signal with the given code rate, including turbo coding the useful data signal to generate three data signals including a systematic data signal, a redundant data signal, and an interleaved redundant data signal;
data rate matching with a variable rate matching ratio defined by a quotient of an input rate to an output rate on a signal path between the channel coding and an emission of the antenna data signals via the transmitting antennas, with the variable rate matching ratio dependent on the given code rate;
generating three mixed data signals with unchanged data rate from the three data signals by distributing data symbols among each other; and
if the number N of transmitting antennas is less than three, generating N antenna data signals by puncturing the three mixed data signals and subsequently multiplexing; or
if the number N of transmitting antennas is greater than three, repeating data symbols of the three mixed data signals and subsequently demultiplexing, wherein N is an integer.
7. The method according to claim 1 , wherein the transmit signal is subjected to CDMA spread-spectrum coding.
8. A method of generating a transmit signal from a useful data signal, the transmit signal comprising a number of antenna data signals each to be emitted via a transmitting antenna, the method which comprises:
selecting a number of transmitting antennas from a variably predeterminable number of transmitting antennas;
channel coding the useful data signal with a fixed code rate; and
data rate matching with a variable rate matching ratio defined by a quotient of input rate to output rate on a signal path between the channel coding and an emission of the antenna data signals via the transmitting antennas, the variable rate matching ratio being dependent on the number of selected transmitting antennas.
9. The method according to claim 8 , wherein the data rate matching step comprises one of puncturing and repeating data symbols of the coded data signal.
10. The method according to claim 8 , which further comprises demultiplexing the coded data signal in the signal path between the channel coding and the emission of the antenna data signals via the transmitting antennas.
11. The method according to claim 8 , which further comprises interleaving the coded data signal in the signal path between the channel coding and the emission via the transmitting antennas.
12. The method according to claim 8 , wherein the channel coding step comprises turbo coding the useful data signal.
13. The method according to claim 12 , which comprises:
in the turbo coding process, generating three data signals including a systematic data signal, a redundant data signal, and an interleaved redundant data signal;
generating three mixed data signals with unchanged data rate from the three data signals by distributing data symbols among each other; and
if the number N of transmitting antennas is less than three, generating N antenna data signals by puncturing the three mixed data signals and subsequently multiplexing;
if the number N of transmitting antennas is greater than three, repeating data symbols of the three mixed data signals and subsequently demultiplexing, wherein N is an integer.
14. The method according to claim 8 , which comprises subjecting the transmit signal to CDNIA spread-spectrum coding.
15. A device for generating a transmit signal from a useful data signal, the transmit signal comprising a plurality of antenna data signals each to be emitted via a respective transmitting antenna, comprising:
a channel coder with variably adjustable code rate and having an input receiving the useful data signal;
a fixed predetermined number of transmitting antennas each for emitting one of the plurality of antenna data signals; and
a data rate matching stage with a variable rate matching ratio connecting in between said channel coder and said fixed predetermined number of transmitting antennas, said data rate matching stage performing a data rate matching with the variable rate matching ratio defined by a quotient of an input rate to an output rate, the variable rate matching ratio being dependent only on the variably adjustable code rate set in said channel coder.
16. The device according to claim 15 , wherein said data rate matching stage comprises at least one of a puncturing device and a device for repeating data symbols of the coded data signal.
17. The device according to claim 15 , which further comprises at least one of a multiplexer and a demultiplexer connecting in a signal path between said data rate matching stage and said transmitting antennas.
18. The device according to claim 15 , wherein said channel coder is a turbo coder.
19. A device for generating a transmit signal from a useful data signal, the transmit signal including a plurality of antenna data signals each to be emitted via a respective transmitting antenna, comprising:
a channel coder with variably adjustable code rate and having an input receiving the useful data signal, said channel coder being a turbo coder configured to generate three mixed data signals of a systematic data signal, a redundant data signal, and an interleaved redundant data signal;
a fixed predetermined number of transmitting antennas each for emitting a respective one of the plurality of antenna data signals;
a data rate matching stage with a variable rate matching ratio connecting in between said channel coder and said fixed predetermined number of transmitting antennas, said data rate matching stage performing a data rate matching with the variable rate matching ratio defined by a quotient of an input rate to an output rate, the variable rate matching ratio being dependent on the variably adjustable code rate set in said channel coder;
a data symbol distributing device, by distributing the data symbols among each other, generates three mixed data signals with unchanged data rate from the three mixed data signals; and
if N<3, said data rate matching stage generates a predetermined number of N antenna data signals by puncturing the three mixed data signals and subsequent multiplexing; or
if N>3, said data rate matching stage generates the predetermined number of N antenna data signals by repeating data symbols of all said three mixed data signals and subsequent demultiplexing, wherein N is an integer.
20. The method according to claim 15 , which comprises a CDMA spread-spectrum coder for subjecting the transmit signal to CDMA spread-spectrum coding.