MULTI-INPUT MULTI-OUTPUT-ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING TRANSCEIVING METHOD AND APPARATUS

• US 20100027688A1
• Filed: 07/31/2007
• Published: 02/04/2010
• Est. Priority Date: 09/15/2006
• Status: Active Grant

• Current Assignee: International Business Machines Corporation, Samsung Electronics Co. Ltd. (Samsung Group)
• Original Assignee: Samsung Electronics Co. Ltd. (Samsung Group)
• Inventors: Kim, Sung-jin, Fujii, Masaaki, Suh, Jung-hoon, Kim, Ho-jin
• Granted Patent: US 8,457,220 B2
• Time in Patent Office: Days
• US Class Current: 375/260
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/0619 using feedback from receiving side feedback signaling for adaptive modulation/coding H04L1/0001
• CPC Class Codes: H04L 2025/03426 transmission using multiple-input and multiple-output channels
• CPC Class Codes: H04L 25/03006 Arrangements for removing intersymbol interference
• 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

Abstract

A multi-input multi-output orthogonal frequency division multiplexing (MIMO-OFDM) transceiving system is provided, in which an MIMO-OFDM receiver feeds back ordering information, such as the order of power intensities of reception signals of a plurality of reception antennas, to an MIMO-OFDM transmitter. The MIMO-OFDM transmitter arranges subcarriers, to which data symbols have been allocated, so that the subcarriers respectively correspond to a plurality of transmission antennas, according to the fed-back information. Thus, a specific substream can be transmitted via a transmission antenna having the greatest channel gain. Consequently, the probability of properly recovering the specific substream is greatly increased.

Claims

1. A transmitting method comprising:

arranging subcarriers to which data symbols have been allocated to respectively correspond to a plurality of transmission antennas, according to information from a receiver;

generating transmission signals by modulating the arranged subcarriers; and

transmitting the transmission signals to the receiver via corresponding plurality of transmission antennas.

2. The transmitting method of claim 1, wherein the information represents an order of power intensities of reception signals of reception antennas, measured by the receiver.

3. The transmitting method of claim 1, wherein the information represents an order of signal interference to noise ratios (SINRs) of reception signals of reception antennas, measured by the receiver.

4. The transmitting method of claim 1, wherein:

the information represents an order of predetermined characteristics of reception signals of at least one of the reception antennas of the receiver; and

the arranging the subcarriers comprises arranging at least one of the subcarriers to correspond to at least one of the transmission antennas, according to the information.

5. The transmitting method of claim 1, wherein:

the information is provided for blocks,

a first block of the blocks corresponds to a first collection of subcarriers; and

the first collection of subcarriers is arranged to correspond to a first transmission antenna of the plurality of transmission antennas, according to the information.

6. The transmitting method of claim 1, wherein the arranging of the subcarriers comprises generating a precoding matrix based on the information and performing a precoding operation of multiplying the precoding matrix by the subcarriers to arrange the subcarriers.

7. The transmitting method of claim 1, wherein in the generating the transmission signals, the arranged subcarriers are modulated by performing inverse fast Fourier transformation (IFFT) operations on the arranged sub carriers.

8. The transmitting method of claim 1, wherein the subcarriers have orthogonal frequencies.

9. A computer readable recording medium that records a computer program for executing a transmitting method, the transmitting method comprising:

arranging subcarriers to which data symbols have been allocated to respectively correspond to a plurality of transmission antennas, according to information from a receiver;

generating transmission signals by modulating the arranged subcarriers; and

transmitting the transmission signals to the receiver via corresponding plurality of transmission antennas.

10. A transmitting apparatus comprising:

precoders which arrange subcarriers to which data symbols have been allocated, to respectively correspond to a plurality of transmission antennas, according to information from a receiver;

inverse fast Fourier transformation (IFFT) units which generate transmission signals by performing IFFT operations on the arranged subcarriers; and

transmission units which transmit the transmission signals to the receiver via the respective transmission antennas.

14. The receiving method of claim 10, wherein the information represents an order of predetermined characteristics of received signals of at least one of the reception antennas of the receiver.

15. The receiving method of claim 10, wherein the information is provided for blocks, the blocks corresponding to collections of subcarriers.

17. The receiving method of claim 14, further comprising recovering the subcarriers to which the data symbols have been allocated, by performing fast Fourier transformation on the received signals.

18. The receiving method of claim 10, wherein the subcarriers have orthogonal frequencies.

11. A receiving method comprising:

receiving a plurality of signals from a transmitter via a plurality of reception antennas;

measuring characteristics of the received signals and feeding information about an order of the measured characteristics back to the transmitter; and

recovering data from the received signals using information previously provided to the transmitter.

12. The receiving method of claim 11, wherein the information represents an order of power intensities of received signals of reception antennas, measured by the receiver.

13. The receiving method of claim 11, wherein the information represents an order of signal interference to noise ratios (SINR) of received signals of reception antennas, measured by the receiver.

16. The receiving method of claim 11, wherein the recovering the data comprises:

rearranging the subcarriers recovered from the received signals back to their original order according to the information previously provided to the transmitter; and

mapping data symbols allocated to the rearranged subcarriers into data corresponding to substreams.

19. A computer readable recording medium that records a computer program for executing a receiving method, the receiving method comprising:

receiving a plurality of signals from a transmitter via a plurality of reception antennas;

measuring characteristics of the received signals and feeding back information about an order of the measured characteristics to the transmitter; and

recovering data from the received signals using information previously provided to the transmitter.

20. A receiving apparatus comprising:

reception units which receive a plurality of signals from a transmitter via a plurality of reception antennas;

feedback units which measure predetermined characteristics of the received signals and feed back information about an order of the measured characteristics to the transmitter;

precoders which rearrange the subcarriers recovered from the received signals back to their original order according to the information previously provided to the transmitter; and

symbol demappers which map data symbols allocated to the rearranged subcarriers into data corresponding to substreams.