Method and apparatus for transmitting/receiving signals in multiple input multiple output wireless communication system employing beam forming scheme

• US 20060104382A1
• Filed: 10/27/2005
• Published: 05/18/2006
• Est. Priority Date: 10/27/2004
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Ho-Jin, Pandharipande, Ashish, Yang, Ho, Park, Hyoung-Woon
• Granted Patent: US 7,711,330 B2
• Time in Patent Office: Days
• US Class Current: 375/267
• CPC Class Codes: H04B 7/043 using best eigenmode, e.g. beam forming or beam steering
• CPC Class Codes: H04L 1/0625 Transmitter arrangements
• CPC Class Codes: H04L 1/0643 block codes

Abstract

Disclosed is a method and an apparatus for transmitting/receiving signals in an multiple input multiple output (MIMO) wireless communication system. The method and apparatus including beam forming of a reference signal while predetermined codes are mapped on a one-to-one basis to each of a plurality of beams available for the transmitter and thereafter transmitting the beam-formed reference signal to a receiver. Also, if information representing an optimum beam, which maximizes reception performance, is received from the receiver, beam forming of data signals is performed by means of a beam corresponding to the information on the optimum beam and the beam-formed data signals are transmitted to the receiver. Therefore, it is possible to apply a beam forming scheme having minimum operation complexity and maximizing reception performance.

Claims

1. A method for transmitting signals by using a beam forming scheme in a transmitter of an multiple input multiple output/multiple input single output (MIMO/MISO) wireless communication system, the method comprising the steps of:

performing beam forming of a reference signal while mapping predetermined codes on a one-to-one basis to each of a plurality of beams available for the transmitter to then transmit the beam-formed reference signal to a receiver; and

if information representing an optimum beam, for maximizing reception performance, is received from the receiver, performing beam forming of data signals by means of a beam corresponding to the information on the optimum beam to transmit the beam-formed data signals to the receiver.

2. The method as claimed in claim 1, wherein the predetermined codes are orthogonal codes.

3. The method as claimed in claim 1, wherein the optimum beam is a beam which transfers maximum energy to the receiver when being selected through mapping of an orthogonal code exhibiting a maximum correlation value from among correlation values of orthogonal codes with the reference signal received in the receiver.

13. The apparatus as claimed in claim 1, wherein the optimum beam is a beam which is mapped to a first orthogonal code exhibiting a maximum correlation value from among correlation values of the orthogonal codes with the reference signal received in the receiver.

14. The apparatus as claimed in claim 13, wherein the sub-optimum beam is a beam which is mapped to a second orthogonal code exhibiting a peak correlation value and having a correlation value below the first orthogonal code and a predetermined threshold correlation value from among the correlation values excluding the maximum correlation value.

4. An apparatus for transmitting signals by using a beam forming scheme in a transmitter of an multiple input multiple output/multiple input single output (MIMO/MISO) wireless communication system, the apparatus comprising:

a beam former for performing beam forming of a reference signal while mapping predetermined codes on a one-to-one basis to each of a plurality of beams available for the transmitter to transmit the beam-formed reference signal to a receiver, and performing beam forming of data signals by means of a beam corresponding to information on an optimum beam, which is provided according to prescribed controls, to transmit the beam-formed data signals to the receiver; and

a decoder for receiving signals from the receiver and for decoding the received signals and transmitting the information on the optimum beam, which maximizes reception performance, from among the beams to the beam former.

5. The apparatus as claimed in claim 4, wherein the predetermined codes are orthogonal codes.

6. The apparatus as claimed in claim 4, wherein the optimum beam is a beam which is mapped to an orthogonal code exhibiting a maximum correlation value from among correlation values of the orthogonal codes with the reference signal received in the receiver.

7. A method for transmitting signals by using a beam forming scheme and an space-time block coding (STBC) scheme in a transmitter of an multiple input multiple output/multiple input single output (MIMO/MISO) wireless communication system, the method comprising the steps of:

performing beam forming of a reference signal while mapping predetermined codes on a one-to-one basis to each of a plurality of beams available for the transmitter to transmit the beam-formed reference signal to a receiver;

receiving information on an optimum beam and a sub-optimum beam, which maximize reception performance, from the receiver; and

if the data signals to be transmitted exist, encoding data signals in the STBC scheme to then perform beam forming of the encoded data signals by means of beams corresponding to the information on the optimum beam and the sub-optimum beam and transmitting the beam-formed data signals to the receiver.

8. The method as claimed in claim 7, wherein the predetermined codes are orthogonal codes.

9. The method as claimed in claim 7, wherein the optimum beam is a beam which is mapped to a first orthogonal code exhibiting a maximum correlation value from among correlation values of the orthogonal codes with the reference signal received in the receiver.

10. The method as claimed in claim 9, wherein the sub-optimum beam is a beam which is mapped to a second orthogonal code exhibiting a peak correlation value and having a correlation value below the first orthogonal code and a predetermined threshold correlation value from among the correlation values excluding the maximum correlation value.

11. An apparatus for transmitting signals by using a beam forming scheme and an space-time block coding (STBC) scheme in a transmitter of an multiple input multiple output/multiple input single output (MIMO/MISO) wireless communication system, the apparatus comprising:

a space-time block encoder for encoding data signals in the STBC scheme if the data signals to be transmitted exist;

a beam former for performing beam forming of a reference signal while mapping predetermined codes on a one-to-one basis to each of a plurality of beams available for the transmitter to transmit the beam-formed reference signal to a receiver, and performing beam forming of the STBC-encoded data signals by means of beams corresponding to information on an optimum beam and information on a sub-optimum beam, which are provided according to prescribed controls, to transmit the beam-formed data signals to the receiver; and

a decoder for receiving signals from the receiver to decode, decoding the received signals and transmitting the information on the optimum beam and the sub-optimum beam, which maximize reception performance, from among the beams to the beam former.

12. The apparatus as claimed in claim I 1, wherein the predetermined codes are orthogonal codes.

15. A method for receiving signals transmitted using a beam forming scheme in a receiver of an multiple input multiple output/multiple input single output (MIMO/MISO) wireless communication system, the method comprising the steps of:

if a reference signal is received, correlating the reference signal with codes pre-mapped on a one-to-one basis to each of a plurality of beams available for the transmitter, respectively;

selecting a beam mapped to a code, which has a maximum correlation value from among correlation values correlated with respect to the respective codes, as an optimum beam; and

feeding back information representing the selected optimum beam to the transmitter.

16. The method as claimed in claim 15, wherein the codes are predetermined orthogonal codes.

17. An apparatus for receiving signals transmitted using a beam forming scheme in a receiver of an multiple input multiple output/multiple input single output (MIMO/MISO) wireless communication system, the apparatus comprising:

a receive processor for receiving a reference signal from a transmitter to correlate the reference signal with predetermined codes pre-mapped on a one-to-one basis to each of a plurality of beams available for the transmitter, respectively, and selecting a beam mapped to a code, which has a maximum correlation value from among correlation values correlated with respect to the respective codes, as an optimum beam; and

an encoder for feeding back information representing the selected optimum beam to the transmitter.

18. The apparatus as claimed in claim 17, wherein the predetermined codes are orthogonal codes.

19. A method for receiving signals transmitted using a beam forming scheme and an space-time block coding (STBC) scheme in a receiver of an multiple input multiple output/multiple input single output (MIMO/MISO) wireless communication system, the method comprising the steps of:

if a reference signal is received, correlating the reference signal with codes pre-mapped on a one-to-one basis to each of a plurality of beams available for the transmitter, respectively;

selecting a beam mapped to a first code, which has a maximum correlation value from among correlation values correlated with respect to the respective codes, as an optimum beam and selecting a beam mapped a second code, which exhibits a peak correlation value and has a correlation value below the first code and a predetermined threshold correlation value from among the correlation values excluding the maximum correlation value, as a sub-optimum beam; and

feeding back information representing the selected optimum beam and sub-optimum beam to the transmitter.

20. The method as claimed in claim 19, wherein the predetermined codes are orthogonal codes.

21. An apparatus for receiving signals transmitted using a beam forming scheme and an space-time block coding (STBC) scheme in a receiver of an multiple input multiple output/multiple input single output (MIMO/MISO) wireless communication system, the apparatus comprising:

a receive processor for receiving a reference signal from a transmitter to correlate the reference signal with predetermined codes pre-mapped on a one-to-one basis to each of a plurality of beams available for the transmitter, respectively, select a beam mapped to a first code, which has a maximum correlation value from among correlation values correlated with respect to the respective codes, as an optimum beam and select a beam mapped a second code, which exhibits a peak correlation value and has a correlation value below the first code and a predetermined threshold correlation value from among the correlation values excluding the maximum correlation value, as a sub-optimum beam; and

an encoder for feeding back information representing the selected optimum beam and sub-optimum beam to the transmitter.

22. The apparatus as claimed in claim 21, wherein the predetermined codes are orthogonal codes.