Apparatus and method for transmitting a data stream in a wireless communication system with multiple antennas

• US 7,876,848 B2
• Filed: 07/27/2005
• Issued: 01/25/2011
• Est. Priority Date: 07/27/2004
• Status: Active Grant

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Dae-Gyun, Mun, Cheol, Han, Jin-Kyu, Lee, Myoung-Won, Kim, Youn-Sun, Kim, Dong-Hee, Kwon, Hwan-Joon, Park, Han-Kyu
• Primary Examiner(s): Lugo; David B
• Application Number:
  US11/190,003
• Publication Number:
  US 20060023624A1
• Time in Patent Office: 2,008 Days
• Field of Search: 375/260, 375/267, 375/299
• US Class Current: 375/267
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0656 Cyclotomic systems, e.g. Bell Labs Layered Space-Time [BLAST]
• CPC Class Codes: H04W 52/346 distributing total power among users or channels
• CPC Class Codes: H04W 52/42 in systems with time, space, frequency or polarisation diversity

Abstract

An apparatus and method for determining a transmission unit for data stream transmission in a wireless communication system in which multiple transmission and reception antennas are used and a receiver provides information on a data stream to be transmitted through a transmission unit. A fading estimator calculates fading values from the multiple transmission antennas to the multiple reception antennas. A channel quality estimator reverse-orders combined weights for multiple transmission units based on the fading values from the multiple transmission antennas to the multiple reception antennas, successively selects transmission units for data stream transmission among the reverse-ordered transmission units, determines a modulation and coding scheme (MCS) for each of the selected transmission units, and feeds back the MCS to a transmitter.

Claims

1. A method for determining a transmission unit for data stream transmission in a wireless communication system in which multiple transmission and reception antennas are used and a receiver provides information on a data stream to be transmitted through a transmission unit, the method comprising the steps of:

reverse-ordering combined weights for multiple transmission units based on fading values from the multiple transmission antennas to the multiple reception antennas;

successively selecting transmission units for data stream transmission among the reverse-ordered transmission units;

calculating a signal-to-interference plus noise ratio (“

SINR”

) for each of the selected transmission units for the data stream transmission and feeding back the SINR to a transmitter; and

determining a modulation and coding scheme (MCS) for each of the selected transmission units and feeding back the MCS to the transmitter,

wherein the method successively demodulates individual transmission data of the multiple transmission units in an order of transmission units with lower channel quality based on the SINR, wherein a low SINR is indicative of lower channel quality.

2. The method of claim 1, further comprising the step of uniformly distributing the total transmission power to the selected transmission units for data stream transmission before determining the MCS.

3. The method of claim 1, wherein the step of selecting transmission units for data stream transmission comprises the step of excluding a transmission unit with no transmission gain, if any.

4. The method of claim 1, wherein each of the fading values is acquired by calculating a combined weight using a minimum mean squared error (MMSE) algorithm.

5. The method of claim 1, wherein each of the fading values is acquired by calculating a combined weight using a zero forcing (ZF) algorithm.

6. The method of claim 1, wherein the transmission units for data stream transmission are transmission antennas.

7. The method of claim 1, wherein the transmission units for data stream transmission are transmission streams.

8. The method of claim 1, wherein the transmission units for data stream transmission are common bases.

9. A method for determining a transmission unit for data stream transmission in a wireless communication system in which multiple transmission and reception antennas are used and a receiver provides information on a data stream to be transmitted through a transmission unit, the method comprising the steps of:

reverse-ordering combined weights for multiple transmission units based on fading values from the multiple transmission antennas to the multiple reception antennas;

successively selecting transmission units for data stream transmission among the reverse-ordered transmission units; and

calculating a signal-to-interference plus noise ratio (“

SINR”

) for each of the selected transmission units for the data stream transmission and feeding back the SINR to a transmitter,

wherein the method successively demodulates individual transmission data of the multiple transmission units in an order of transmission units with lower channel quality based on the SINR, wherein a low SINR is indicative of lower channel quality.

10. The apparatus of claim 9, wherein the step of selecting transmission units for data stream transmission comprises the step of excluding a transmission unit with no transmission gain, if any.

11. The apparatus of claim 9, wherein each of the fading values is acquired by calculating a combined weight using a minimum mean squared error (MMSE) algorithm.

12. The apparatus of claim 9, wherein each of the fading values is acquired by calculating a combined weight using a zero forcing (ZF) algorithm.

13. The apparatus of claim 9, wherein the transmission units for data stream transmission are transmission antennas.

14. The apparatus of claim 9, wherein the transmission units for data stream transmission are transmission streams.

15. The apparatus of claim 9, wherein the transmission units for data stream transmission are common bases.

16. An apparatus for determining a transmission unit for data stream transmission in a wireless communication system in which multiple transmission and reception antennas are used and a receiver provides information on a data stream to be transmitted through a transmission unit, the apparatus comprising:

a fading estimator for calculating fading values from the multiple transmission antennas to the multiple reception antennas; and

a channel quality estimator for reverse-ordering combined weights for multiple transmission units based on the fading values from the multiple transmission antennas to the multiple reception antennas, successively selecting transmission units for data stream transmission among the reverse-ordered transmission units, determining a modulation and coding scheme (MCS) for each of the selected transmission units, and feeding back the MCS to a transmitter,

wherein the channel quality estimator calculates a signal-to-interference plus noise ratio (“

SINR”

) for each of the selected transmission units for the data stream transmission and further feeds back the SINR to the transmitter,

wherein the channel quality estimator successively demodulates individual transmission data of the multiple transmission units in the order of transmission units with lower channel quality, based on the SINR, wherein a low SINR is indicative of lower channel quality.

17. The apparatus of claim 16, wherein the channel quality estimator uniformly distributes the total transmission power to the selected transmission units for data stream transmission before determining the MCS.

18. The apparatus of claim 16, wherein the channel quality estimator excludes a transmission unit with no transmission gain, if any, while selecting the transmission units for data stream transmission.

19. The apparatus of claim 16, wherein each of the fading values is acquired by calculating a combined weight using a minimum mean squared error (MMSE) algorithm.

20. The apparatus of claim 16, wherein each of the fading values is acquired by calculating a combined weight using a zero forcing (ZF) algorithm.

21. The apparatus of claim 16, wherein the transmission units for data stream transmission are transmission antennas.

22. The apparatus of claim 16, wherein the transmission units for data stream transmission are transmission streams.

23. The apparatus of claim 16, wherein the transmission units for data stream transmission are common bases.

24. The apparatus of claim 16, further comprising a symbol demodulation and decoding block for demodulating and decoding symbols per reception unit based on the fading value.

25. An apparatus for determining a transmission unit for data stream transmission in a wireless communication system in which multiple transmission and reception antennas are used and a receiver provides information on a data stream to be transmitted through a transmission unit, the apparatus comprising:

a fading estimator for calculating fading values from the multiple transmission antennas to the multiple reception antennas; and

a channel quality estimator for reverse-ordering combined weights for multiple transmission units based on the fading values from the multiple transmission antennas to the multiple reception antennas, successively selecting transmission units for data stream transmission among the reverse-ordered transmission units, calculating a signal-to-interference plus noise ratio (“

SINR”

) for each of the selected transmission units for data stream transmission, and feeding back the SINR to a transmitter,

wherein the channel quality estimator successively demodulates individual transmission data of the multiple transmission units in the order of transmission units with lower channel quality based on the SINR, wherein a low SINR is indicative of lower channel quality.

26. The apparatus of claim 25, wherein the channel quality estimator excludes a transmission unit with no transmission gain, if any, while selecting the transmission units for data stream transmission.

27. The apparatus of claim 25, wherein each of the fading values is acquired by calculating a combined weight using a minimum mean squared error (MMSE) algorithm.

28. The apparatus of claim 25, wherein each of the fading values is acquired by calculating a combined weight using a zero forcing (ZF) algorithm.

29. The apparatus of claim 25, wherein the transmission units for data stream transmission are transmission antennas.

30. The apparatus of claim 25, wherein the transmission units for data stream transmission are transmission streams.

31. The apparatus of claim 25, wherein the transmission units for data stream transmission are common bases.

32. The apparatus of claim 25, further comprising a symbol demodulation and decoding block for demodulating and decoding symbols per reception unit based on the fading value.