METHOD FOR TRANSMITTING AT LEAST ONE MULTI-CARRIER SIGNAL CONSISTING OF OFDM-OQAM SYMBOLS

• US 20140348252A1
• Filed: 12/19/2012
• Published: 11/27/2014
• Est. Priority Date: 12/23/2011
• Status: Active Grant

• Current Assignee: Orange S.A.
• Original Assignee: Orange S.A.
• Inventors: Siohan, Pierre, Jahan, Bruno, Phan Huy, Dinh Thuy, Dubois, Thierry, Helard, Maryfine
• Granted Patent: US 9,479,381 B2
• Time in Patent Office: Days
• US Class Current: 375/261
• CPC Class Codes: H04B 7/0669 using different channel coding between antennas space-time coding H04L1/0618
• CPC Class Codes: H04L 1/0668 Orthogonal systems, e.g. using Alamouti codes
• CPC Class Codes: H04L 27/26412 Filtering over the entire frequency band, e.g. filtered orthogonal frequency-division multiplexing [OFDM]
• CPC Class Codes: H04L 27/26536 Filtering over the entire frequency band, e.g. filtered orthogonal frequency division multiplexing [OFDM]
• CPC Class Codes: H04L 27/2698 double density OFDM/OQAM system, e.g. OFDM/OQAM-IOTA system
• CPC Class Codes: H04L 27/368 adaptive predistortion

Abstract

Disclosed is a transmission method of transmitting at least one multicarrier signal made up of OFDM-OQAM symbols to a receive antenna of a receiver device, the transmission method being for use by a transmitter device having at least one transmit antenna. In one embodiment, the method comprises, for each transmit antenna of the transmitter device, filtering OFDM-OQAM symbols associated with the transmit antenna using a time-reversal prefilter defined from an estimate of the transmission channel between the transmit antenna and the receive antenna and transmitting the filtered OFDM-OQAM symbols via the transmit antenna over the transmission channel.

Claims

1. A transmission method for transmitting at least one multicarrier signal made up of OFDM-OQAM symbols to a receive antenna of a receiver device, said transmission method being for use by a transmitter device having at least one transmit antenna, said transmission method comprising, for each transmit antenna of the transmitter device:

filtering OFDM-OQAM symbols associated with the transmit antenna using a time-reversal prefilter defined from an estimate of the transmission channel between said transmit antenna and said receive antenna; and

transmitting the filtered OFDM-OQAM symbols via said transmit antenna over said transmission channel.

2. A transmission method according to claim 1, wherein the transmitter device has a number N of transmit antennas greater than 1, said transmission method further comprising a coding process during which coding is applied to real value symbols, the coding being defined by a determined real coding matrix generating N coded symbol sequences associated with said N transmit antennas, a coded symbol of a coded symbol sequence associated with a transmit antenna modulating a carrier of a said OFDM-OQAM symbol associated with that antenna.

3. A transmission method according to claim 2, wherein the real coding matrix is a real orthogonal matrix.

4. A transmission method according to claim 2, wherein the coding applied during the coding step has a coding rate of 1.

5. A transmission method according to claim 2, wherein the coding applied during the coding step is space-time coding.

6. A transmission method according to claim 2, wherein the coding applied during the coding step is space-frequency coding.

7. A computer program including instructions for executing steps of the transmission method according to claim 1 when said program is executed by a computer.

8. A non-transitory computer readable storage medium storing a computer program including instructions for executing steps of the transmission method according to claim 1.

9. A reception method for receiving an OFDM-OQAM type multicarrier signal, referred to as a received multicarrier signal, which method is performed by a receiver device having a receive antenna, said received multicarrier signal resulting from at least one OFDM-OQAM type multicarrier signal being transmitted over a propagation channel in accordance with a transmission method according to claim 1 by a transmitter device having at least one transmit antenna, said reception method including a performing OFDM-OQAM demodulation of said received multicarrier signal.

10. A communication method of transmitting at least one OFDM-OFQAM type multicarrier signal performed by a communications system comprising a transmitter device having at least one transmit antenna and a receiver device having a receive antenna, said method comprising:

said transmitter device transmitting said at least one multicarrier signal in accordance with a transmission method according to claim 1; and

said receiver device receiving said at least one multicarrier signal in accordance with a reception method according to claim 9.

15. A signal made up of at least one OFDM-OQAM type multicarrier signal transmitted by a transmitter device having at least one transmit antenna in accordance with a transmission method according to claim 1.

11. A transmitter device having at least one transmit antenna and suitable for transmitting at least one OFDM-OQAM type multicarrier signal via said at least one transmit antenna to a receive antenna of a receiver device, said transmitter device comprising in association with each transmit antenna:

a component configured to filter OFDM-OQAM symbols associated with that transmit antenna, said component comprising a time-reversal prefilter defined on the basis of an estimate of a transmission channel between said transmit antenna and said receive antenna; and

a component configured to transmit the filtered OFDM-OQAM symbols via said transmit antenna over said transmission channel.

12. A transmitter device according to claim 11, having a number N of transmit antennas greater than 1 and further comprising a component configured to apply coding to real value symbols, the coding being defined by a determined real coding matrix generating N coded symbol sequences associated with said N transmit antennas, a coded symbol of a coded symbol sequence associated with a transmit antenna modulating a carrier of a said OFDM-OQAM symbol associated with that antenna.

13. A receiver device suitable for receiving an OFDM-OQAM type multicarrier signal, referred to as a received multicarrier signal, the receiver device having a receive antenna, said received multicarrier signal being the result of at least one OFDM-OQAM type multicarrier signal being transmitted over a propagation channel by a transmitter device having at least one transmit antenna and in accordance with claim 11, said receiver device including an OFDM-OQAM demodulator suitable for demodulating received multicarrier signals.

14. A communications system comprising:

a transmitter device in accordance with claim 11 having at least one transmit antenna suitable for transmitting at least one OFDM-OQAM type multicarrier signal over said at least one transmit antenna; and

a receiver device in accordance with claim 13, including a receive antenna and suitable for receiving said at least one multicarrier signal over said receive antenna.