Wireless transmission device and wireless reception device

• US 9,281,880 B2
• Filed: 08/13/2012
• Issued: 03/08/2016
• Est. Priority Date: 08/15/2011
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Ruiz Delgado, Alvaro, Onodera, Takashi, Tomeba, Hiromichi, Nakano, Hiroshi, Kubota, Minoru
• Primary Examiner(s): Liu, Jung-Jen
• Application Number:
  US14/239,088
• Publication Number:
  US 20140204841A1
• Time in Patent Office: 1,303 Days
• US Class Current: 1/1
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04B 7/0456 Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
• CPC Class Codes: H04B 7/0689 using different transmission schemes, at least one of them being a diversity transmission scheme
• CPC Class Codes: H04L 2025/03802 Signalling on the reverse channel

Abstract

A wireless reception device is notified of whether a multi-user MIMO signal transmitted from a wireless transmission device has undergone linear precoding or non-linear precoding without increasing the amount of control information. A wireless transmission device having a plurality of transmit antennas 303, for transmitting spatially multiplexed signals to a plurality of wireless reception devices includes a group construction unit 307 configured to classify the wireless reception devices into a plurality of groups and to determine a precoding scheme for each of the groups, a selection unit 315 configured to select one group from among the groups, and a precoding unit 323 configured to precode transmit data addressed to each of wireless reception devices belonging to the selected group, using a precoding scheme determined for the selected group.

Claims

1. A wireless transmission device having a plurality of transmit antennas and performing multi-user MIMO transmission, for spatially multiplexing and simultaneously transmitting transmit data addressed to a plurality of wireless reception devices, comprising:

a group construction unit configured to create a plurality of groups representing a combination of the plurality of wireless reception devices used to perform the multi-user MIMO transmission and to determine in advance, for each of the groups, one of a linear precoding or a non-linear precoding, a precoding scheme used to perform the mult-user MIMO transmission,

a configuration information generation unit configured to generate group configuration information for notifying the plurality of wireless reception devices of a configuration and a group identification number in advance for each of the plurality of groups;

a selection unit configured to select one group from among the plurality of groups;

an identification information generation unit configured to generate group identification information for notification of the group identification number of the selected group; and

a precoding unit configured to precode transmit data addressed to each of the wireless reception devices belonging to the selected group using the precoding scheme determined in advance for the selected group, wherein

the group configuration information is transmitted to the plurality of wireless reception device in advance prior to transmission of the precoded signals, and the group identification information together with the precoded signals is transmitted to each of the wireless reception devices belonging to the selected group.

2. The wireless transmission device according to claim 1, wherein

the group construction unit further determines in advance, for each of the wireless reception devices in each of the groups, a precoding scheme used to perform the multi-user MIMO transmission, and

the precoding unit precodes transmit data addressed to each of the wireless reception devices belonging to the selected group using a precoding scheme determined in advance for each of the wireless reception devices in the selected group.

3. The wireless transmission device according to claim 1, wherein

the group construction unit further assigns one group identification number on the basis of the precoding scheme determined in advance for each of the groups among candidate group identification numbers determined in advance in association with a precoding scheme, and

the precoding unit precodes transmit data addressed to each of the wireless reception devices belonging to the selected group using the precoding scheme corresponding to the group identification number assigned to the selected group.

4. The wireless transmission device according to claim 3, wherein

the precoding unit performs a modulo operation on a signal to be transmitted to a wireless reception device belonging to the selected group in a case where the precoding scheme corresponding to the group identification number assigned to the selected group is non-linear precoding.

5. The wireless transmission device according to claim 4, wherein in a case where the precoding scheme corresponding to the group identification number assigned to the selected group is non-linear precoding, the precoding unit does not perform a modulo operation on a signal to be transmitted to a wireless reception device which supports only linear precoding in a case where the wireless reception device which supports only linear precoding belongs to the selected group.

6. The wireless transmission device according to claim 3, wherein

the precoding scheme is one of linear precoding, non-linear precoding, and hybrid linear and non-linear precoding including a mixture of linear precoding and non-linear precoding,

the group construction unit further determines an ordinal number of each of wireless reception devices belonging to each of the groups, in the group, and

in a case where the precoding scheme corresponding to the group identification number assigned to the selected group is hybrid linear and non-linear precoding, the precoding unit does not perform a modulo operation on a signal to be transmitted to a wireless reception device with an ordinal number less than or equal to a predetermined threshold value among the wireless reception devices belonging to the selected group, and performs a modulo operation on a signal to be transmitted to a wireless reception device with an ordinal number greater than the threshold value.

7. The wireless transmission device according to claim 6, wherein in a case where the precoding scheme corresponding to the group identification number assigned to the selected group is hybrid linear and non-linear precoding, the precoding unit does not perform a modulo operation on a signal to be transmitted to a wireless reception device which supports only linear precoding in a case where the wireless reception device which supports only linear precoding is included in wireless reception devices with ordinal numbers greater than the threshold value among the wireless reception devices belonging to the selected group.

8. The wireless transmission device according to claim 6, wherein the group construction unit further generates a plurality of groups including an identical combination of wireless reception devices, wherein different precoding schemes are determined in advance for each of the groups including the identical combination of wireless reception devices or the wireless reception devices are arranged in different orders in the groups.

16. The wireless transmission device according to claim 1, wherein the group construction unit further generates a plurality of groups including an identical combination of wireless reception devices, wherein different precoding schemes are determined in advance for each of the groups including the identical combination of wireless reception devices.

9. A wireless reception device for receiving a multi-user MIMO signal which is obtained by spatially multiplexing transmit data addressed to a plurality of wireless reception devices and simultaneous transmitted, from a wireless transmission device having a plurality of transmit antennas, comprising:

a reception unit configured to receive group configuration information for notification of a configuration and a group identification number of a group which the plurality of wireless reception devices to which the multi-user MIMO signals are to be transmitted belongs to, prior to reception of the multi-user MIMO signals and to receive group identification information for notification of the group identification number of the group which the plurality of wireless reception devices to which the multi-user MIMO signals are to be transmitted belongs to, together with the multi-user MIMO signals;

a determination unit configured to determine whether the wireless reception device belongs to a group indicated by the group identification information on the basis of the group configuration information and the group identification information; and

a reception processing unit configured to perform reception processing on the received multi-user MIMO in accordance with a precoding scheme determined in advance to one of a linear precoding or a non-linear precoding, for the wireless reception device in the group indicated by the group identification information in a case where as a result of the determination, the wireless reception device is determined to belong to the group indicated by the group identification information.

10. The wireless reception device according to claim 9, wherein

the reception processing unit performs a modulo operation on a data symbol of the received multi-user MIMO signal in a case where the precoding scheme is non-linear precoding.

11. A wireless reception device for receiving a multi-user MIMO signal which is obtained by spatially multiplexing transmit data addressed to a plurality of wireless reception devices and simultaneous transmitted, from a wireless transmission device having a plurality of transmit antennas, comprising:

a reception unit configured to receive group configuration information for notification of a configuration and a group identification number of a group which the plurality of wireless reception devices to which the multi-user MIMO signals are to be transmitted belongs to, prior to reception of the multi-user MIMO signals and to receive group identification information for notification of the group identification number of the group which the plurality of wireless reception devices to which the multi-user MIMO signals are to be transmitted belongs to, together with the multi-user MIMO signals;

a determination unit configured to determine whether the wireless reception device belongs to a group indicated by the group identification information on the basis of the group configuration information and the group identification information; and

a reception processing unit configured to perform reception processing on the received multi-user MIMO signal in accordance with a precoding scheme determined in advance to be one of a linear precoding or a non-linear precoding, for the group identified by the group identification information in a case where as a result of the determination, the wireless reception device is determined to belong to the group indicated by the group identification information.

12. The wireless reception device according to claim 11, wherein

the reception processing unit performs a modulo operation on a data symbol of the received multi-user MIMO signal in a case where the precoding scheme is non-linear precoding.

13. The wireless reception device according to claim 11, wherein

the reception processing unit performs reception processing in accordance with a precoding scheme determined in advance in association with a group identification number indicated by the group identification information in a case where it is determined that the wireless reception device belongs to the group indicated by the group identification information.

14. The wireless reception device according to claim 13, wherein

the precoding scheme is one of linear precoding, non-linear precoding, and hybrid linear and non-linear precoding including a mixture of linear precoding and non-linear precoding, and

the reception processing unit performs a modulo operation on a received data symbol in a case where the precoding scheme is non-linear precoding.

15. The wireless reception device according to claim 13, wherein

the precoding scheme is one of linear precoding, non-linear precoding, and hybrid linear and non-linear precoding including a mixture of linear precoding and non-linear precoding, and

in a case where the precoding scheme is hybrid linear and non-linear precoding, the reception processing unit does not perform a modulo operation on a received data symbol in a case where the ordinal number of the wireless reception device in the group is less than or equal to a predetermined threshold value, and performs a modulo operation on a received data symbol in a case where the ordinal number of the wireless reception device in the group indicated by the group identification information is greater than the predetermined threshold value.