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

• US 7,711,330 B2
• Filed: 10/27/2005
• Issued: 05/04/2010
• Est. Priority Date: 10/27/2004
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Pandharipande, Ashish, Kim, Ho-Jin, Yang, Ho, Park, Hyoung-Woon
• Primary Examiner(s): Nguyen; Duc
• Assistant Examiner(s): CHOW, CHARLES CHIANG
• Application Number:
  US11/260,852
• Publication Number:
  US 20060104382A1
• Time in Patent Office: 1,650 Days
• Field of Search: 255/277.1, 255/424, 255/425, 255/456.5, 255/456.6, 255/550.1, 255/575.1, 255/13.1, 255/24, 255/63.1, 255/63.4, 255/562.1, 255/575.7, 255/69, 255/553.1, 255/134, 255/135, 255/101, 255/102, 255/103, 255/562.2, 255/277.2, 255/278, 255/279, 255/126, 375/267, 375/299, 375/221, 375/262, 375/295, 375/140, 370/334, 370/339, 370/328, 370/342, 370/335, 370/203, 342/154, 342/354, 342/432
• US Class Current: 455/101
• 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 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:

performing beam forming of a reference signal by applying a plurality of beams available for the transmitter mapped to orthogonal codes on a one-to-one basis to the reference signal to transmit the beam-formed reference signal to a receiver;

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

encoding data signals in the STBC scheme to perform beam forming of the encoded data signals by using beams corresponding to the information on the optimum beam and the sub-optimum beam; and

transmitting the beam-formed data signals to the receiver,

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 orthogonal codes applied to processing of the reference signal received in the receiver and 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.

2. 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;

a beam former for performing beam forming of a reference signal by applying a plurality of beams available for the transmitter mapped to orthogonal codes on a one-to-one basis to the reference signal to transmit the beam-formed reference signal to a receiver, and performing beam forming of the STBC-encoded data signals by using beams corresponding to information on an optimum beam and information on a sub-optimum beam, which are received from the receiver, 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, to maximize reception performance, to the beam former,

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 orthogonal codes applied to processing of the reference signal received in the receiver and 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.

3. 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:

in response to receiving a reference signal, correlating the reference signal with predetermined codes pre-mapped on a one-to-one basis to a plurality of beams available for the transmitter;

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

4. The method as claimed in claim 3, wherein the predetermined codes are orthogonal codes.

5. 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 a plurality of beams available for the transmitter, selecting a beam mapped to a first predetermined code, which has a maximum correlation value from among correlation values correlated with respect to the predetermined codes, as an optimum beam and selecting a beam mapped a second predetermined code, which exhibits a peak correlation value and has a correlation value below the first predetermined 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.

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