Method and system for uplink beamforming calibration in a multi-antenna wireless communication system
View Patent ↗A wireless transceiver, comprising a transmitter, a receiver and a plurality of antennas, determines transmit phase relationship between at least two of antennas based on radio frequency (RF) signals received via the at least two antennas from one or more antennas of a base station. RF signals are transmitted via the at least two antennas utilizing the determined transmit phase relationship. The receiver is calibrated based on receiver performance determined from the received RF signals for subsequent reception of RF signals. The transmit phase relationship is dynamically adjusted based on the transmit RF measurements and the determined receiver performance. Transmit channel qualities are determined for each transmit antenna based on the transmit RF measurements and the dynamically adjusted transmit phase relationship. Transmit antennas are dynamically selected based on the adjusted transmit phase relationship, the characterized transmit channel qualities and the determined receiver performance for subsequent transmission to the base station.
1. A method for communication, the method comprising:
in a wireless communication device comprising a receiver, transmitter and a plurality of antennas:
determining transmit phase relationship between at least two of said plurality of antennas based on radio frequency signals received by said plurality of antennas, wherein said radio frequency signals are received from one or more antennas of a base station;
transmitting radio frequency signals to said base station from, said at least two of said plurality of antennas using said determined transmit phase relationship; and
receiving said radio frequency signals, from said one or more antennas of said base station, wherein subcarriers to be allocated for said transmission are a subset of subcarriers of said received radio frequency signals.
2. A method for communication, the method comprising:
in a wireless communication device comprising a receiver, a transmitter and a plurality of antennas:
determining transmit phase relationship between at least two of said plurality of antennas based on radio frequency signals received by said plurality of antennas, wherein said, radio frequency signals are received from one or more antennas of a base station;
transmitting radio frequency signals to said base station from said at least two of said plurality of antennas using said determined transmit phase relationship; and
determining performance of said receiver on a frequency selective basis or on a non-frequency basis.
3. The method according to claim 2 , farther comprising calibrating one or more receive paths of said receiver based on said determined performance of said receiver for subsequently receiving radio frequency signals via said at least two of said plurality of antennas from said one or more antennas of said base station.
4. The method according to claim 2 , further comprising measuring transmit power and transmit phase of said transmitted radio frequency signals during said transmission for said determined performance of said receiver.
5. The method according to claim 4 , further comprising dynamically adjusting said determined transmit phase relationship between said at least two of said plurality of antennas based on said transmit power measurements and said transmit phase measurements over said selected transmit antennas, and said determined performance of said receiver.
6. The method according to claim 5 , further comprising determining transmit channel qualities for said at least two of said plurality of antennas based on said transmit power measurements and said transmit phase measurements over said selected transmit antennas, said dynamically adjusted transmit phase relationship and said determined performance of said receiver.
7. The method according to claim 6 , further comprising dynamically selecting two or more of said plurality of antennas and corresponding transmit power levels based on said dynamically adjusted transmit phase relationship, said determined transmit channel qualities and said determined performance of said receiver.
8. The method according to claim 7 , wherein said dynamically selected corresponding transmit power levels correspond to a majority of transmission power at said transmitter.
9. The method according to claim 7 , further comprising transmitting subsequent radio frequency signals to said one or more antennas of said base station utilizing said dynamically selected two or more of said plurality of antennas at said dynamically selected corresponding transmit power levels.
10. The method according to claim 2 , further comprising dynamically adjusting said determined transmit phase relationship between said at least two of said plurality of antennas based on received signal characteristics, the received signal characteristics including at least one of received signal strength, signal-to-noise ratio, estimated interference power, and variance of received signal.
11. A system for communication, the system comprising:
one or more processors and/or circuits for use in a wireless communication device comprising a plurality of antennas, said one or more processors and/or circuits comprising a receiver and a transmitter, and said one or more processors and/or circuits being configured to:
determine transmit phase relationship between at least two of said plurality of antennas based on radio frequency signals received by said plurality of antennas, wherein said radio frequency signals are received from one or more antennas of a base station;
transmit radio frequency signals to said base station from said at least two of said plurality of antennas using said determined transmit phase relationship; and
receive said radio frequency signals, from said one or more antennas of said base station, wherein subcarriers to be allocated for said transmission are a subset of subcarriers of said received radio frequency signals.
12. A system for communication, the system comprising:
one or more processors and/or circuits for use in a wireless communication device comprising a plurality of antennas, said one or more processors and/or circuits comprising a receiver and a transmitter, and said one or more processors and/or circuits being configured to:
determine transmit phase relationship between at least two of said plurality of antennas based on radio frequency signals received by said plurality of antennas, wherein said radio frequency signals are received from one or more antennas of a base station;
transmit radio frequency signals to said base station from sad at least two of said plurality of antennas using said determined transmit phase relationship; and
determine performance of said receiver on a frequency selective basis or on a non-frequency basis.
13. The system according to claim 12 , wherein said one or more processors and/or circuits are further configured to calibrate one or more receive paths of said receiver based on said determined performance of said receiver for subsequently receiving radio frequency signals via said at least two of said plurality of antennas from said one or more antennas of said base station.
14. The system according to claim 12 , wherein said one or more processors and/or circuits are further configured to measure transmit power and transmit phase of said transmit radio frequency signals during said transmission for said determined performance of said receiver.
15. The system according to claim 14 , wherein said one or more processors and/or circuits are further configured to dynamically adjust said determined transmit phase relationship between said at least two of said plurality of antennas based on said transmit power measurements and said transmit phase measurements over said selected transmit antennas, and said determined performance of said receiver.
16. The system according to claim 15 , wherein said one or more processors and/or circuits are further configured to determine transmit channel qualities for said at least two of said plurality of antennas based on said transmit power measurements and said transmit phase measurements over said selected transmit antennas, said dynamically adjusted transmit phase relationship and said determined performance of said receiver.
17. The system according to claim 16 , wherein said one or more processors and/or circuits are further configured to dynamically select two or more of said plurality of antennas and corresponding transmit power levels based on said dynamically adjusted transmit phase relationship, said determined transmit channel qualities and said determined performance of said receiver.
18. The system according to claim 17 , wherein said dynamically selected corresponding transmit power levels correspond to majority of transmission power at said wireless transmitter.
19. The system according to claim 18 , wherein said one or more processors and/or circuits are further configured to transmit subsequent radio frequency signals to said one or more antennas of said base station utilizing said dynamically selected two or more of said plurality of antennas at said dynamically selected corresponding transmit power levels.
20. The system according to claim 12 , wherein said one or more processors and/or circuits are further configured to dynamically adjust said determined transmit phase relationship between said at least two of said plurality of antennas based on received signal characteristics, the received signal characteristics including at least one of received signal strength, signal-to-noise ratio, estimated interference power, and variance of received signal.