WIRELESS TRANSMISSION DEVICE AND WIRELESS RECEPTION DEVICE

• US 20140204841A1
• Filed: 08/13/2012
• Published: 07/24/2014
• 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
• Granted Patent: US 9,281,880 B2
• Time in Patent Office: Days
• US Class Current: 370/328
• 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, for transmitting spatially multiplexed signals to a plurality of wireless reception devices, comprising:

a group construction unit configured to create a plurality of groups each including a plurality of wireless reception devices and to determine in advance, for each of the groups, a precoding scheme used to precode each of signals to be spatially multiplexed and transmitted to the plurality of wireless reception devices belonging to each of the groups;

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

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

2. The wireless transmission device according to claim 1, further comprising:

a group storage unit configured to store the created groups;

a configuration information generation unit configured to generate group configuration information on each of the groups; and

an identification information generation unit configured to generate group identification information on the selected group, wherein

the group configuration information is transmitted to the plurality of wireless reception devices in advance prior to transmission of the precoded signals, and the group identification information is transmitted to the plurality of wireless reception devices to ether with the precoded signals.

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

the group construction unit further determines in advance, for each of wireless reception devices in each of the groups, a precoding scheme used to precode each of signals to be spatially multiplexed and transmitted to the plurality of wireless reception devices belonging to each of the groups, and

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

5. The wireless transmission device according to claim 4, further comprising:

a group storage unit configured to store the created groups;

a configuration information generation unit configured to generate group configuration information on each of the groups; and

an identification information generation unit configured to generate group identification information on the selected group, wherein

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

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

the group construction unit further assigns one identification number among candidate identification numbers determined in advance in association with a precoding scheme determined in advance for each of the groups to each of the groups, 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 identification number assigned to the selected group.

22. The wireless transmission device according to claim 21, further comprising:

a group storage unit configured to store the created groups;

a configuration information generation unit configured to generate group configuration information on each of the groups; and

an identification information generation unit configured to generate group identification information for notification of the identification number of the selected group, wherein

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

25. The wireless transmission device according to claim 21, wherein

the precoding scheme includes at least linear precoding and non-linear precoding, and

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 identification number assigned to the selected group is non-linear precoding.

26. The wireless transmission device according to claim 25, wherein in a case where the precoding scheme corresponding to the 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.

27. The wireless transmission device according to claim 21, wherein

the precoding scheme is one of linear precoding, non-linear precoding, or 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 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.

28. The wireless transmission device according to claim 27, wherein in a case where the precoding scheme corresponding to the 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.

40. 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.

41. The wireless transmission device according to claim 27, 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.

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7. A wireless reception device for receiving a spatially multiplexed signal from a wireless transmission device having a plurality of transmit antennas, comprising:

a reception unit configured to receive group configuration information on a plurality of groups each including a plurality of wireless reception devices to which spatially multiplexed signals are to be transmitted and group identification information;

a determination unit configured to determine whether the wireless reception device belongs to a group identified 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 a signal addressed to the wireless reception device in accordance with a precoding scheme determined in advance for the group identified by the group identification information in a case where it is determined that the wireless reception device belongs to the group identified by the group identification information.

8. The wireless reception device according to claim 7, wherein

the precoding scheme is one of linear precoding or 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.

30. The wireless reception device according to claim 7, wherein

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

31. The wireless reception device according to claim 30, further comprising:

a configuration information acquisition unit configured to acquire group configuration information on a plurality of groups each including a plurality of wireless reception devices to which the wireless transmission device is to transmit signals; and

a group storage unit configured to store the group configuration information.

33. The wireless reception device according to claim 30, wherein

the precoding scheme is one of linear precoding, non-linear precoding, or 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.

34. The wireless reception device according to claim 30, wherein

the precoding scheme is one of linear precoding, non-linear precoding, or 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 identified by the group identification information is greater than the predetermined threshold value.

9. A wireless reception device for receiving a spatially multiplexed signal from a wireless transmission device having a plurality of transmit antennas, comprising:

a reception unit configured to receive group configuration information on a plurality of groups each including a plurality of wireless reception devices to which spatially multiplexed signals are to be transmitted and group identification information;

a determination unit configured to determine whether the wireless reception device belongs to a group identified 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 a signal addressed to the wireless reception device in accordance with a precoding scheme determined in advance for the wireless reception device in the group identified by the group identification information in a case where it is determined that the wireless reception device belongs to the group identified by the group identification information.

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

the precoding scheme is one of linear precoding or 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.

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