ARRAY ANTENNA, METHOD AND DEVICE FOR TRANSMITTING AND RECEIVING SIGNAL

• US 20150249488A1
• Filed: 05/08/2015
• Published: 09/03/2015
• Est. Priority Date: 11/12/2012
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: WU, Tao, LU, Weishan
• Granted Patent: US 9,281,878 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H01Q 19/32 the primary active element being end-fed and elongated
• CPC Class Codes: H01Q 21/00 Antenna arrays or systems arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system H01Q3/00
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/0632 Channel quality parameters, e.g. channel quality indicator [CQI]

Abstract

The present application discloses an array antenna, a method and a device for transmitting and receiving a signal. The array antenna includes at least two active antennas, wherein each active antenna is surrounded by at least two different parasitic antennas, respective parasitic antennas are respectively coupled to controllable loads, and the controllable loads are respectively coupled to a control circuit. With the arrangement of at least two active antennas, when a channel is in a good state, channel capacity can be adjusted by adjusting the controllable loads coupled to the parasitic antennas; and when the channel is not in the good state, the bit error ratio can be reduced by both adjusting the controllable loads coupled to the parasitic antennas and adjusting transmitting directional diagrams of the active antennas according to an adjustment vector, meanwhile, miniaturization can also be realized.

Claims

1. A method for transmitting data, characterized by comprising at least two active antennas, wherein each active antenna is surrounded by at least two different parasitic antennas, respective parasitic antennas are respectively coupled to controllable loads, and the controllable loads are respectively coupled to a control circuit, the method comprises steps of:

determining, by a signal transmitting device, whether a downlink channel is in a good state according to channel change predictions, channel quality report feedback or uplink data transmission conditions; and

if the channel is in the good state, selecting an orthogonal transmitting combination, and adjusting reactance of the controllable loads via the control circuit according to the orthogonal transmitting combination to transmit data, and bearing the data of the signal transmitting device in a mode command by using a multiplexing mode to transmit data to a signal receiving device;

if the channel is not in the good state, selecting a relevant transmitting combination, and adjusting the reactance of the controllable loads via the control circuit according to the relevant transmitting combination, and adjusting transmitting directional diagrams of the active antennas according to a transmitting beamforming vector to transmit data, and bearing the data of the signal transmitting device in the mode command by using a beamforming mode to transmit it to the signal receiving device.

2. The method according to claim 1, wherein, before the step of selecting the orthogonal transmitting combination, the method comprises a step of:

traversing different reactance of the controllable loads within a predefined range to acquire multiple sets of transmitting direction vector combinations;

the step of selecting the orthogonal transmitting combination comprises steps of;

traversing the transmitting direction vector combinations acquired to acquire at least one set of transmitting direction vector combination which enables the transmitting directional diagram of each active antenna to be orthogonal so as to form at least one set of orthogonal transmitting combinations;

determining whether the downlink channel is in a slow fading condition or a fast fading condition according to the channel change predictions, the channel quality report feedback or the uplink data transmission conditions; and

if the channel is in the slow fading condition, selecting from the at least one set of orthogonal transmitting combinations a set of orthogonal transmitting combination which maximizes channel capacity, and bearing the data of the signal transmitting device in the mode command by using a slow fading mode to transmit it to the signal receiving device;

if the channel is in the fast fading condition, dividing time frequency resources of the transmitted data into resource blocks which have the same number as that of the orthogonal transmitting combinations, wherein each resource block selects a set of orthogonal transmitting combination correspondingly, and bearing the data of the signal transmitting device in the mode command by using a fast fading mode to transmit it to the signal receiving device.

3. The method according to claim 1, wherein, the step of selecting the relevant transmitting combination comprises steps of:

traversing different reactance of the controllable loads within a predefined range to acquire multiple sets of transmitting direction vector combinations;

determining whether relevance of each set of transmitting direction vector combination is greater than a threshold value;

if the relevance of the transmitting direction vector combination is greater than the threshold value, then storing the set of transmitting direction vector combination to form at least one set of relevant transmitting combinations;

determining whether the downlink channel is in a slow fading condition or a fast fading condition according to the channel change predictions, the channel quality report feedback or the uplink data transmission conditions; and

if the channel is in the slow fading condition, selecting from the at least one set of relevant transmitting combinations a set of relevant transmitting combination which maximizes a first way beam gain, and the data of bearing the signal transmitting device in the mode command by using a slow fading mode to transmit it to the signal receiving device;

if the channel is in the fast fading condition, dividing time frequency resources of the transmitted data into resource blocks which have the same number as that of the relevant transmitting combinations, wherein each resource block selects a set of relevant transmitting combination correspondingly, and bearing the data of the signal transmitting device in the mode command by using a fast fading mode to transmit it to the signal receiving device.

4. The method according to claim 3, wherein, the transmitting beamforming vector is a right singular vector corresponding to the first way beam gain after a singular value decomposition is performed to a channel transmission matrix.

5. A signal transmitting device, characterized by comprising at least two active antennas, wherein each active antenna is surrounded by at least two different parasitic antennas, respective parasitic antennas are respectively coupled to controllable loads, and the controllable loads are respectively coupled to a control circuit, the device further comprises:

a determining module and a selecting and adjusting module;

the determining module is configured to determine whether a downlink channel is in a good state according to channel change predictions, channel quality report feedback or uplink data transmission conditions, and transmit a first determining result to the selecting and adjusting module; and

the selecting and adjusting module is configured to receive the first determining result, and when the channel is in the good state, select an orthogonal transmitting combination, and adjust reactance of the controllable loads via the control circuit according to the orthogonal transmitting combination to transmit data, and bear the data of the signal transmitting device in a mode command by using a multiplexing mode to transmit data to a signal receiving device;

when the channel is not in the good state, select a relevant transmitting combination, and adjust the reactance of the controllable loads via the control circuit according to the relevant transmitting combination, and adjust transmitting directional diagrams of the active antennas according to a transmitting beamforming vector to transmit data, and bear the data of the signal transmitting device in the mode command by using a beamforming mode to transmit it to the signal receiving device.

6. The signal transmitting device according to claim 5, wherein, the selecting and adjusting module comprises a first traversing unit, a second traversing unit, a first determining unit and a first selecting unit;

the first traversing unit is configured to traverse different reactance of the controllable loads within a predefined range to acquire multiple sets of transmitting direction vector combinations, and transmit the multiple sets of transmitting direction vector combinations to the second traversing unit;

the second traversing unit is configured to traverse the transmitting direction vector combinations acquired to acquire at least one set of transmitting direction vector combination which enables the transmitting directional diagram of each active antenna to be orthogonal so as to form at least one set of orthogonal transmitting combinations, and transmit the at least one set of orthogonal transmitting combinations to the first selecting unit;

the first determining unit is configured to determine whether the downlink channel is in a slow fading condition or in a fast fading condition according to the channel change predictions, the channel quality report feedback or the uplink data transmission conditions, and transmit a second determining result to the first selecting unit; and

the first selecting unit is configured to receive the at least one set of orthogonal transmitting combinations and the second determining result, and when the channel is in the slow fading condition, select from the at least one set of orthogonal transmitting combinations a set of orthogonal transmitting combination which maximizes channel capacity, and bear the data of the signal transmitting device in the mode command by using a slow fading mode to transmit it to the signal receiving device;

when the channel is in the fast fading condition, divide time frequency resources of the transmitted data into resource blocks which have the same number as that of orthogonal transmitting combinations, wherein each resource block selects a set of orthogonal transmitting combination correspondingly, and bear the data of the signal transmitting device in the mode command by using a fast fading mode to transmit it to the signal receiving device.

7. The signal transmitting device according to claim 5, wherein, the selecting and adjusting module comprises a third traversing unit, a second determining unit, a storing unit, a third determining unit and a second selecting unit;

the third traversing unit is configured to traverse different reactance of the controllable loads within a predefined range to acquire multiple sets of transmitting direction vector combinations, and transmit the multiple sets of transmitting direction vector combinations to the second determining unit;

the second determining unit is configured to receive the multiple sets of transmitting direction vector combinations, determine whether relevance of each set of transmitting direction vector combination is greater than a threshold value, and transmit a third determining result to the storing unit;

the storing unit is configured to receive the third determining result, when the relevance of the transmitting direction vector combination is greater than the threshold value, store the set of transmitting direction vector combination to form at least one set of relevant transmitting combinations, and transmit the at least one set of relevant transmitting combinations to the second selecting unit;

the third determining unit is configured to determine whether the downlink channel is in a slow fading condition or in a fast fading condition according to the channel change predictions, the channel quality report feedback or the uplink data transmission conditions, and transmit a fourth determining result to the second selecting unit; and

the second selecting unit is configured to receive the at least one set of relevant transmitting combinations and the fourth determining result, and when the channel is in the slow fading condition, select from the at least one set of relevant transmitting combinations a set of relevant transmitting combination which maximizes a first way beam gain, and bear the data of the signal transmitting device in the mode command by using a slow fading mode to transmit it to the signal receiving device;

when the channel is in the fast fading condition, divide time frequency resources of the transmitted data into resource blocks which have the same number as that of relevant transmitting combinations, wherein each resource block selects a set of relevant transmitting combination correspondingly, and bear the data of the signal transmitting device in the mode command by using a fast fading mode to transmit it to the signal receiving device.

8. The signal transmitting device according to claim 7, wherein, the transmitting beamforming vector is a right singular vector corresponding to the first way beam gain after a singular value decomposition is performed to a channel transmission matrix.

9. A signal receiving device, characterized by comprising at least two active antennas, wherein each active antenna is surrounded by at least two different parasitic antennas, respective parasitic antennas are respectively coupled to controllable loads, and the controllable loads are respectively coupled to a control circuit, the device further comprises:

a determining module and a selecting and adjusting module;

the determining module is configured to receive a mode command, and determine whether a signal transmitting device uses a multiplexing mode or a beamforming mode according to the mode command, and transmit a first determining result to the selecting and adjusting module; and

the selecting and adjusting module is configured to receive the first determining result, and when the signal transmitting device uses the multiplexing mode, select an orthogonal receiving combination, and adjust reactance of the controllable loads via the control circuit according to the orthogonal receiving combination to receive a signal;

when the signal transmitting device uses the beamforming mode, select a relevant receiving combination, and adjusting the reactance of the controllable loads via the control circuit according to the relevant receiving combination, and adjust receiving directional diagrams of the active antennas according to a receiving beamforming vector to receive the signal.

10. The signal receiving device according to claim 9, wherein, the selecting and adjusting module comprises a first traversing unit, a second traversing unit, a first determining unit and a first selecting unit;

the first traversing unit is configured to traverse different reactance of the controllable loads within a predefined range to acquire multiple sets of receiving direction vector combinations, and transmit the multiple sets of receiving direction vector combinations to the second traversing unit;

the second traversing unit is configured to traverse the receiving direction vector combinations acquired to acquire at least one set of receiving direction vector combination which enables the receiving directional diagram of each active antenna to be orthogonal so as to form at least one set of orthogonal receiving combinations, and transmit the at least one set of orthogonal receiving combinations to the first selecting unit;

the first determining unit is configured to determine whether the signal transmitting device uses a slow fading mode or a fast fading mode according to the mode command, and transmit a second determining result to the first selecting unit; and

the first selecting unit is configured to receive the at least one set of orthogonal receiving combinations and the second determining result, and when the signal transmitting device uses the slow fading mode, select from the at least one set of orthogonal receiving combinations a set of orthogonal receiving combination which maximizes channel capacity;

when the signal transmitting device uses the fast fading mode, divide time frequency resources of the received signal into resource blocks which have the same number as that of orthogonal receiving combinations, wherein each resource block selects a set of orthogonal receiving combination correspondingly.

11. The signal receiving device according to claim 9, wherein, the selecting and adjusting module comprises a third traversing unit, a second determining unit, a storing unit, a third determining unit and a second selecting unit;

the third traversing unit is configured to traverse different reactance of the controllable loads within a predefined range to acquire multiple sets of receiving direction vector combinations, and transmit the multiple sets of receiving direction vector combinations to the second determining unit;

the second determining unit is configured to receive the multiple sets of receiving direction vector combinations, determine whether relevance of each set of receiving direction vector combination is greater than a threshold value, and transmit a third determining result to the second selecting unit;

the storing unit is configured to;

when the relevance of the receiving direction vector combination is greater than the threshold value, store the set of receiving direction vector combination to form at least one set of relevant receiving combinations, and transmit the at least one set of relevant receiving combinations to the second selecting unit;

the third determining unit is configured to receive the at least one set of relevant receiving combinations, determine whether the signal transmitting device uses a slow fading mode or a fast fading mode according to the mode command, and transmit a fourth determining result to the second selecting unit; and

the second selecting unit is configured to receive the at least one set of relevant receiving combinations and the fourth determining result, and when the signal transmitting device uses the slow fading mode, select from the at least one set of relevant receiving combinations a set of relevant receiving combination which maximizes a first way beam gain;

when the signal transmitting device uses the fast fading mode, divide time frequency resources of the received signal into resource blocks which have the same number as that of relevant receiving combinations, wherein each resource block selects a set of relevant receiving combination correspondingly.

12. The signal receiving device according to claim 11, wherein, the receiving beamforming vector is conjugation of a left singular vector corresponding to the first way beam gain after a singular value decomposition is performed to a channel transmission matrix.