Method and apparatus for combining space-frequency block coding, spatial multiplexing and beamforming in a MIMO-OFDM system

• US 9,544,093 B2
• Filed: 09/04/2015
• Issued: 01/10/2017
• Est. Priority Date: 11/12/2004
• Status: Active Grant

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Kwak, Jaeyoung, Koo, Chang-Soo, Olesen, Robert L., Bultan, Aykut, Ozluturk, Fatih
• Primary Examiner(s): Aghdam, Freshteh N
• Application Number:
  US14/846,055
• Publication Number:
  US 20150381319A1
• Time in Patent Office: 494 Days
• Field of Search: 375/260, 375/267, 375/295, 375/316
• US Class Current: 1/1
• CPC Class Codes: H04B 7/0408 using two or more beams, i.e. beam diversity
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0697 using spatial multiplexing
• 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 1/04 using frequency diversity
• CPC Class Codes: H04L 1/0606 Space-frequency coding
• CPC Class Codes: H04L 25/0248 Eigen-space methods
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 27/2626 Arrangements specific to the transmitter only
• CPC Class Codes: H04L 27/2647 Arrangements specific to the receiver only equalisation H04L27/01
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT

Abstract

A method and apparatus for combining space-frequency block coding (SFBC) in a multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system is described herein. A transmitter, according to one embodiment, may include four antennas and circuitry configured to transmit in an OFDM symbol time period using both frequency diversity and SFBC. For frequency diversity at least one first data element may be repeated producing at least two second data elements and the two second data elements are transmitted using different subcarriers. For space frequency block coding, a pair of third data elements may be space frequency block coded producing four fourth data elements. The four fourth data elements may be transmitted using two subcarriers and only two of the four antennas.

Claims

1. A transmitter comprising:

four antennas; and

circuitry configured to transmit a signal in an orthogonal frequency division multiplex (OFDM) symbol time period using both frequency diversity and space frequency block coding, wherein for the frequency diversity at least one first data element is repeated producing at least two data elements and the at least two data elements are transmitted using different subcarriers on a same antenna, wherein for the space frequency block coding, the at least one first data element is space frequency block coded with another data element producing four data elements, wherein the signal includes the four data elements and the four data elements are transmitted using two subcarriers and only two of the four antennas.

2. The transmitter of claim 1, wherein the at least one first data element and the another data element relate to data of a same channel.

3. The transmitter of claim 1, wherein the at least one first data element and the another data element are derived from different data.

4. The transmitter of claim 1, wherein the at least two data elements are transmitted using different ones of the four antennas than the four data elements.

5. A communication system comprising:

at least one receive antenna; and

a receiver configured to receive data in a signal in an orthogonal frequency division multiplex (OFDM) symbol time period transmitted using both frequency diversity and space frequency block coding, wherein for the frequency diversity at least one first data element was repeated producing at least two data elements and the at least two data elements were transmitted using different subcarriers on a same antenna, wherein for the space frequency block coding, the at last one first data element was space frequency block coded with another data element producing four data elements, wherein the signal includes the four data elements and the four data elements were transmitted using two subcarriers and only two of four antennas.

6. The communication system of claim 5, wherein the at least one first data element and the another data element relate to data of a same channel.

7. The communication system of claim 5, wherein the at least one first data element and the another data element were derived from different data.

8. The communication system of claim 5, wherein the two data elements were transmitted using different ones of the four antennas than the four data elements.

9. A method comprising:

transmitting, by a transmitter, a signal in an orthogonal frequency division multiplex (OFDM) symbol time period using both frequency diversity and space frequency block coding using four antennas, wherein for the frequency diversity at least one first data element is repeated producing at least two data elements and the at least two data elements are transmitted using different subcarriers on a same antenna, wherein for the space frequency block coding, the at least one first data element is space frequency block coded with another data element producing four data elements, wherein the signal includes the four data elements and the four data elements are transmitted using two subcarriers and only two of four antennas.

10. The method of claim 9, wherein the at least one first data element and the another data element relate to data of a same channel.

11. The method of claim 9, wherein the at least one first data element and the another data element are derived from different data.

12. The method of claim 9, wherein the at least two data elements are transmitted using different ones of the four antennas than the four data elements.

13. A method comprising:

receiving, by a receiver, data in a signal in an orthogonal frequency division multiplex (OFDM) symbol time period transmitted using both frequency diversity and space frequency block coding, wherein for the frequency diversity at least one first data element was repeated producing at least two data elements and the two data elements were transmitted using different subcarriers on a same antenna, wherein for the space frequency block coding, the at least one first data element was space frequency block coded with another data element producing four data elements, wherein the signal includes the four data elements and the four data elements were transmitted using two subcarriers and only two of four antennas.

14. The method of claim 13, wherein the at least one first data element and the another data element relate to data of a same channel.

15. The method of claim 13, wherein the at least one first data element and the another data element were derived from different data.

16. The method of claim 13, wherein the at least two data elements were transmitted using different ones of the four antennas than the four data elements.