Transmission method using complex channel symbols
View Patent ↗A transmission method and a transmitter include one or more antennas for achieving several transmit antenna patterns for the transmission of a signal, and a receiver for receiving complex channel symbols at its input. To achieve a high transmission rate and good resistance to interference, the transmitter is configured to code the complex channel symbols by using orthogonally distributed channel resources into channel symbols such that a channel symbol to be transmitted using at least one antenna pattern during at least one channel resource unit is a linear combination of at least three modulation symbols. The invention also includes a transmitter for transmitting more than T complex modulation symbols during T channel resource units, wherein T is at least 2.
1. A method, comprising:
providing a channel symbol to be transmitted using at least one antenna pattern during at least one channel resource unit is a linear combination of at least three modulation symbols, where more than T complex modulation symbols are transmitted during T symbol periods, wherein T is at least 2; and
transmitting channel symbols composed of complex modulation symbols via two transmit antenna patterns by using orthogonally distributed channel resources.
2. A method as claimed in claim 1 , wherein the complex modulation symbols are coded using space-time block coding.
3. A method as claimed in claim 1 , wherein the orthogonally distributed channel resources are symbol periods.
4. A method as claimed in claim 1 , wherein the orthogonally distributed channel resources are frequency bands.
5. A method as claimed in claim 1 , wherein the orthogonally distributed channel resources are spreading codes.
6. A method as claimed in claim 1 , wherein the orthogonally distributed channel resources are different frequency band Fourier modes.
7. A method as claimed in claim 1 , wherein more than two complex modulation symbols are transmitted during two channel resource units and that each channel symbol to be transmitted is a linear combination of four modulation symbols.
8. A method as claimed in claim 1 , wherein at least two modulation symbols are coded orthogonally.
9. A method as claimed in claim 8 , wherein the channel symbols are generated by summing up at least two orthogonally coded modulation symbol sequences with a partial phase difference.
10. A method as claimed in claim 9 , wherein the phase difference is 180°.
11. A method as claimed in claim 9 , wherein the phase difference is used in half of the channel resource units covered by the code.
12. A method as claimed in claim 3 , wherein a correlation time is estimated for the transmission channel used in the data transfer, and the time between two symbol periods is selected such that it is shorter than the correlation time estimated for the transmission channel.
13. A method as claimed in claim 9 , wherein the orthogonally coded modulation symbols are subjected to diversity transform.
14. A method, comprising:
transmitting channel symbols composed of complex modulation symbols via at least three transmit antenna patterns by using orthogonally distributed channel resources; and
providing a symbol to be transmitted using at least one antenna pattern during at least one channel resource unit is a linear combination of more than T modulation symbols, wherein T is at least 2, where at least 2T complex modulation symbols are transmitted during T channel resource units via more than two transmit antenna patterns.
15. An apparatus, comprising:
a transmitter configured to achieve two transmit antenna patterns for the transmission of a signal;
receiver configured to receive complex channel symbols at its input,
wherein the transmitter is configured to code the complex channel symbols by using orthogonally distributed channel resources into channel symbols such that a channel symbol to be transmitted using at least one antenna pattern during at least one channel resource unit is a linear combination of at least three modulation symbols, and
wherein the transmitter is configured to transmit more than T complex modulation symbols during T channel resource units, wherein T is at least 2.
16. An apparatus as claimed in claim 15 , wherein the transmitter configured to subject the symbols to be transmitted to space-time block coding.
17. An apparatus as claimed in claim 15 , wherein the transmitter is configured to code the complex modulation symbols to channel symbols by symbol periods such that each channel symbol to be transmitted is a linear combination of four modulation symbols, and transmitter configured to transmit more than two complex modulation symbols during two channel resource units.
18. An apparatus as claimed in claim 15 , wherein the transmitter is configured to code the complex modulation symbols by using different frequency bands.
19. An apparatus as claimed in claim 15 , wherein the transmitter is configured to code the complex modulation symbols by using symbol periods.
20. An apparatus as claimed in claim 15 , wherein the transmitter is configured to code the complex modulation symbols by using different spreading codes.
21. An apparatus as claimed in claim 15 , wherein the transmitter is configured to code the complex modulation symbols by using different frequency band Fourier modes.
22. An apparatus, comprising:
an transmitter configured to achieve at least three transmit antenna patterns for the transmission of a signal;
a receiver configured to receive complex channel symbols at its input; and
wherein the transmitter is configured to code the complex channel symbols by using orthogonally distributed channel resources into channel symbols such that a channel symbol to be transmitted using at least one antenna pattern during at least one channel resource unit is a linear combination of more than T modulation symbols, wherein T is at least 2; and
wherein the transmitter is configured to transmit at least 2T complex modulation symbols during T channel resource units via more than two transmit antenna patterns.
23. An apparatus, comprising:
achieving means for achieving two transmit antenna patterns for the transmission of a signal;
receiving means for receiving complex channel symbols at its input;
coding means for coding the complex channel symbols by using orthogonally distributed channel resources into channel symbols such that a channel symbol to be transmitted using at least one antenna pattern during at least one channel resource unit is a linear combination of at least three modulation symbols; and
transmitting means for transmitting more than T complex modulation symbols during T channel resource units, wherein T is at least 2.
24. An apparatus, comprising:
achieving means for achieving at least three transmit antenna patterns for the transmission of a signal;
receiving means for receiving complex channel symbols at its input;
coding means for coding the complex channel symbols by using orthogonally distributed channel resources into channel symbols such that a channel symbol to be transmitted using at least one antenna pattern during at least one channel resource unit is a linear combination of more than T modulation symbols, wherein T is at least 2; and
transmitting means for transmitting at least 2T complex modulation symbols during T channel resource units via more than two transmit antenna patterns.