Method and system for providing multi-input-multi-output (MIMO) downlink transmission
View Patent ↗An approach is provided for supporting transmission in a multi-input-multi-output (MIMO) communication system including a plurality of terminals. A preamble portion of a frame is transmitted by a multiple transmit antennas of a hub using Orthogonal Frequency Division Multiplexing (OFDM) to the terminals over a channel, wherein each of the terminals determines a characteristic of the channel with respect to the transmit antennas as feedback information. The hub receives the feedback information from the terminals. The hub selects, according to the feedback information, a subset of the antennas for transmission of a remaining portion of the frame to the terminal.
1. A method for supporting transmission of data in a multi-input-multi-output communication system to one or more terminals, the method comprising:
receiving a signal comprising information to be wirelessly transmitted to one or more terminals, the information comprising at least one of audio, video, or broadband Internet communications; and
transmitting the information via a plurality of frames, the plurality of frames comprising:
preamble portions transmitted over a plurality of sets of Orthogonal Frequency Division Multiplexing (OFDM) subcarriers via a corresponding plurality of antennas, sequential ones of the frames comprising different sets of the OFDM subcarriers in the preamble portions transmitted over the plurality of antennas, the preamble portions to repeat the sets of OFDM subcarriers when each of the plurality of antennas has transmitted each of the OFDM subcarriers; and
data portions including the information and transmitted over subsets of the OFDM subcarriers via subsets of the antennas, the subsets of the OFDM subcarriers being assigned to the subsets of antennas based on feedback information determined from the preamble portions of the corresponding ones of the frames, wherein the information is transmitted using transmission parameters derived based on the feedback information, the transmission parameters are selected to reduce a transmission power or increase a transmission rate to at least one of the terminals, and the feedback information is determined via a maximum ratio combining receiver.
2. A method as defined in claim 1 , wherein the transmission parameters are selected for each frame.
3. A method as defined in claim 1 , wherein the feedback information is received from the one or more terminals, the feedback information comprising measurements of each of the subcarriers made by each of the one or more terminals.
4. A method as defined in claim 1 , wherein one or more of the plurality of sets of OFDM sub-carriers comprise consecutive OFDM sub-carriers over an entire allocated bandwidth.
5. A method as defined in claim 1 , wherein one or more of the frames comprise information to be transmitted to a plurality of terminals.
6. A method for supporting transmission of data in a multi-input-multi-output communication system to one or more terminals, the method comprising:
receiving a signal comprising information to be wirelessly transmitted to one or more terminals; and
transmitting the information via a plurality of frames, the plurality of frames comprising:
preamble portions transmitted over a plurality of sets of Orthogonal Frequency Division Multiplexing (OFDM) subcarriers via a corresponding plurality of antennas, sequential ones of the frames comprising different sets of the OFDM subcarriers in the preamble portions transmitted over the plurality of antennas, the preamble portions to repeat the sets of OFDM subcarriers when each of the plurality of antennas has transmitted each of the OFDM subcarriers, wherein the OFDM subcarriers are spaced 0.3125 MHz apart; and
data portions including the information and transmitted over subsets of the OFDM subcarriers via subsets of the antennas, the subsets of the OFDM subcarriers being assigned to the subsets of antennas based on feedback information determined from the preamble portions of the corresponding ones of the frames, wherein the information is transmitted using transmission parameters derived based on the feedback information, the transmission parameters are selected for each frame, and the transmission parameters are selected to reduce a transmission power or increase a transmission rate to at least one of the terminals.
7. A method for supporting transmission of data in a multi-input-multi-output communication system to one or more terminals, the method comprising:
receiving a signal comprising information to be wirelessly transmitted to one or more terminals; and
transmitting the information via a plurality of frames, the plurality of frames comprising:
preamble portions transmitted over a plurality of sets of Orthogonal Frequency Division Multiplexing (OFDM) subcarriers via a corresponding plurality of antennas, sequential ones of the frames comprising different sets of the OFDM subcarriers in the preamble portions transmitted over the plurality of antennas, the preamble portions to repeat the sets of OFDM subcarriers when each of the plurality of antennas has transmitted each of the OFDM subcarriers, wherein the feedback information is determined via a maximum ratio combining receiver; and
data portions including the information and transmitted over subsets of the OFDM subcarriers via subsets of the antennas, the subsets of the OFDM subcarriers being assigned to the subsets of antennas based on feedback information determined from the preamble portions of the corresponding ones of the frames, wherein the information is transmitted using transmission parameters derived based on the feedback information, the transmission parameters are selected for each frame, and the transmission parameters are selected to reduce a transmission power or increase a transmission rate to at least one of the terminals.
8. A hub device to transmit data in a multi-input-multi-output communication system, the device comprising:
a processor; and
a memory, storing instructions which, when executed by the processor, cause the processor to:
determine one or more destination terminals to which to wirelessly transmit a received symbol stream, the symbol stream comprising information, the information comprising at least one of audio, video, or broadband Internet communications; and
transmit the information to the determined one or more terminals via a plurality of frames, the plurality of frames comprising:
preamble portions transmitted over a plurality of sets of Orthogonal Frequency Division Multiplexing (OFDM) subcarriers via a corresponding plurality of antennas, sequential ones of the frames comprising different sets of the OFDM subcarriers in the preamble portions transmitted over the plurality of antennas, the preamble portions to repeat the sets of OFDM subcarriers when each of the plurality of antennas has transmitted each of the OFDM subcarriers; and
data portions including the information and transmitted over subsets of the OFDM subcarriers via subsets of the antennas, the subsets of the OFDM subcarriers being assigned to the subsets of antennas based on feedback information determined from the preamble portions of the corresponding ones of the frames, wherein the information is transmitted using transmission parameters derived based on the feedback information, the transmission parameters are selected to reduce a transmission power or increase a transmission rate to at least one of the terminals, and the feedback information is determined via a maximum ratio combining receiver.
9. A device as defined in claim 8 , wherein the instructions further cause the processor to select the transmission parameters for each frame.
10. A device as defined in claim 8 , wherein the feedback information is received from the one or more terminals, the feedback information comprising measurements of each of the subcarriers made by each of the one or more terminals.
11. A device as defined in claim 8 , wherein one or more of the frames comprise information to be transmitted to a plurality of terminals.
12. A hub device to transmit data in a multi-input-multi-output communication system, the device comprising:
a processor; and
a memory, storing instructions which, when executed by the processor, cause the processor to:
determine one or more destination terminals to which to wirelessly transmit a received symbol stream, the symbol stream comprising information; and
transmit the information to the determined one or more terminals via a plurality of frames, the plurality of frames comprising:
preamble portions transmitted over a plurality of sets of Orthogonal Frequency Division Multiplexing (OFDM) subcarriers via a corresponding plurality of antennas, sequential ones of the frames comprising different sets of the OFDM subcarriers in the preamble portions transmitted over the plurality of antennas, the preamble portions to repeat the sets of OFDM subcarriers when each of the plurality of antennas has transmitted each of the OFDM subcarriers, wherein the OFDM subcarriers are spaced 0.3125 MHz apart; and
data portions including the information and transmitted over subsets of the OFDM subcarriers via subsets of the antennas, the subsets of the OFDM subcarriers being assigned to the subsets of antennas based on feedback information determined from the preamble portions of the corresponding ones of the frames, wherein the information is transmitted using transmission parameters derived based on the feedback information, the transmission parameters are selected for each frame, and the transmission parameters are selected to reduce a transmission power or increase a transmission rate to at least one of the terminals.
13. A hub device to transmit data in a multi-input-multi-output communication system, the device comprising:
a processor; and
a memory, storing instructions which, when executed by the processor, cause the processor to:
determine one or more destination terminals to which to wirelessly transmit a received symbol stream, the symbol stream comprising information; and
transmit the information to the determined one or more terminals via a plurality of frames, the plurality of frames comprising:
preamble portions transmitted over a plurality of sets of Orthogonal Frequency Division Multiplexing (OFDM) subcarriers via a corresponding plurality of antennas, sequential ones of the frames comprising different sets of the OFDM subcarriers in the preamble portions transmitted over the plurality of antennas, the preamble portions to repeat the sets of OFDM subcarriers when each of the plurality of antennas has transmitted each of the OFDM subcarriers; and
data portions including the information and transmitted over subsets of the OFDM subcarriers via subsets of the antennas, the subsets of the OFDM subcarriers being assigned to the subsets of antennas based on feedback information determined from the preamble portions of the corresponding ones of the frames, wherein the feedback information is determined via a maximum ratio combining receiver, wherein the information is transmitted using transmission parameters derived based on the feedback information, the transmission parameters are selected for each frame, and the transmission parameters are selected to reduce a transmission power or increase a transmission rate to at least one of the terminals.
14. A device as defined in claim 8 , wherein one or more of the plurality of sets of OFDM sub-carriers comprise consecutive OFDM sub-carriers over an entire allocated bandwidth.
15. A method for supporting transmission of data in a multi-input-multi-output communication system to one or more terminals, the method comprising:
receiving a signal comprising information to be wirelessly transmitted to one or more terminals, the information comprising at least one of audio, video, or broadband Internet communications; and
transmitting the information via a plurality of frames, the plurality of frames comprising:
preamble portions transmitted over a plurality of sets of Orthogonal Frequency Division Multiplexing (OFDM) subcarriers via a corresponding plurality of antennas, sequential ones of the frames comprising different sets of the OFDM subcarriers in the preamble portions transmitted over the plurality of antennas, the preamble portions to repeat the sets of OFDM subcarriers when each of the plurality of antennas has transmitted each of the OFDM subcarriers; and
data portions including the information and transmitted over subsets of the OFDM subcarriers via subsets of the antennas, the subsets of the OFDM subcarriers being assigned to the subsets of antennas based on feedback information determined from the preamble portions of the corresponding ones of the frames, wherein the information is transmitted using transmission parameters derived based on the feedback information, the transmission parameters are selected to reduce a transmission power or increase a transmission rate to at least one of the terminals, and the OFDM subcarriers are spaced 0.3125 MHz apart.
16. A method for supporting transmission of data in a multi-input-multi-output communication system to one or more terminals, the method comprising:
receiving a signal comprising information to be wirelessly transmitted to one or more terminals; and
transmitting the information via a plurality of frames, the plurality of frames comprising:
preamble portions transmitted over a plurality of sets of Orthogonal Frequency Division Multiplexing (OFDM) subcarriers via a corresponding plurality of antennas, sequential ones of the frames comprising different sets of the OFDM subcarriers in the preamble portions transmitted over the plurality of antennas, the preamble portions to repeat the sets of OFDM subcarriers when each of the plurality of antennas has transmitted each of the OFDM subcarriers; and
data portions including the information and transmitted over subsets of the OFDM subcarriers via subsets of the antennas, the subsets of the OFDM subcarriers being assigned to the subsets of antennas based on feedback information determined from the preamble portions of the corresponding ones of the frames, wherein the feedback information is received from the one or more terminals, the feedback information comprising measurements of each of the subcarriers made by each of the one or more terminals, the information is transmitted using transmission parameters derived based on the feedback information, the transmission parameters are selected to reduce a transmission power or increase a transmission rate to at least one of the terminals, and the feedback information is determined via a maximum ratio combining receiver.
17. A method for supporting transmission of data in a multi-input-multi-output communication system to one or more terminals, the method comprising:
receiving a signal comprising information to be wirelessly transmitted to one or more terminals; and
transmitting the information via a plurality of frames, the plurality of frames comprising:
preamble portions transmitted over a plurality of sets of Orthogonal Frequency Division Multiplexing (OFDM) subcarriers via a corresponding plurality of antennas, sequential ones of the frames comprising different sets of the OFDM subcarriers in the preamble portions transmitted over the plurality of antennas, the preamble portions to repeat the sets of OFDM subcarriers when each of the plurality of antennas has transmitted each of the OFDM subcarriers; and
data portions including the information and transmitted over subsets of the OFDM subcarriers via subsets of the antennas, the subsets of the OFDM subcarriers being assigned to the subsets of antennas based on feedback information determined from the preamble portions of the corresponding ones of the frames, wherein the feedback information is received from the one or more terminals, the feedback information comprising measurements of each of the subcarriers made by each of the one or more terminals, the information is transmitted using transmission parameters derived based on the feedback information, the transmission parameters are selected to reduce a transmission power or increase a transmission rate to at least one of the terminals, and the OFDM subcarriers are spaced 0.3125 MHz apart.
18. A hub device to transmit data in a multi-input-multi-output communication system, the device comprising:
a processor; and
a memory, storing instructions which, when executed by the processor, cause the processor to:
determine one or more destination terminals to which to wirelessly transmit a received symbol stream, the symbol stream comprising information, the information comprising at least one of audio, video, or broadband Internet communications; and
transmit the information to the determined one or more terminals via a plurality of frames, the plurality of frames comprising:
preamble portions transmitted over a plurality of sets of Orthogonal Frequency Division Multiplexing (OFDM) subcarriers via a corresponding plurality of antennas, sequential ones of the frames comprising different sets of the OFDM subcarriers in the preamble portions transmitted over the plurality of antennas, the preamble portions to repeat the sets of OFDM subcarriers when each of the plurality of antennas has transmitted each of the OFDM subcarriers; and
data portions including the information and transmitted over subsets of the OFDM subcarriers via subsets of the antennas, the subsets of the OFDM subcarriers being assigned to the subsets of antennas based on feedback information determined from the preamble portions of the corresponding ones of the frames, wherein the information is transmitted using transmission parameters derived based on the feedback information, the transmission parameters are selected to reduce a transmission power or increase a transmission rate to at least one of the terminals, and the OFDM subcarriers are spaced 0.3125 MHz apart.
19. A hub device to transmit data in a multi-input-multi-output communication system, the device comprising:
a processor; and
a memory, storing instructions which, when executed by the processor, cause the processor to:
determine one or more destination terminals to which to wirelessly transmit a received symbol stream, the symbol stream comprising information; and
transmit the information to the determined one or more terminals via a plurality of frames, the plurality of frames comprising:
preamble portions transmitted over a plurality of sets of Orthogonal Frequency Division Multiplexing (OFDM) subcarriers via a corresponding plurality of antennas, sequential ones of the frames comprising different sets of the OFDM subcarriers in the preamble portions transmitted over the plurality of antennas, the preamble portions to repeat the sets of OFDM subcarriers when each of the plurality of antennas has transmitted each of the OFDM subcarriers, wherein the OFDM subcarriers are spaced 0.3125 MHz apart; and
data portions including the information and transmitted over subsets of the OFDM subcarriers via subsets of the antennas, the subsets of the OFDM subcarriers being assigned to the subsets of antennas based on feedback information determined from the preamble portions of the corresponding ones of the frames, wherein the feedback information is received from the one or more terminals, the feedback information comprising measurements of each of the subcarriers made by each of the one or more terminals, the information is transmitted using transmission parameters derived based on the feedback information, and the transmission parameters are selected to reduce a transmission power or increase a transmission rate to at least one of the terminals.
20. A hub device to transmit data in a multi-input-multi-output communication system, the device comprising:
a processor; and
a memory, storing instructions which, when executed by the processor, cause the processor to:
determine one or more destination terminals to which to wirelessly transmit a received symbol stream, the symbol stream comprising information; and
transmit the information to the determined one or more terminals via a plurality of frames, the plurality of frames comprising:
preamble portions transmitted over a plurality of sets of Orthogonal Frequency Division Multiplexing (OFDM) subcarriers via a corresponding plurality of antennas, sequential ones of the frames comprising different sets of the OFDM subcarriers in the preamble portions transmitted over the plurality of antennas, the preamble portions to repeat the sets of OFDM subcarriers when each of the plurality of antennas has transmitted each of the OFDM subcarriers; and
data portions including the information and transmitted over subsets of the OFDM subcarriers via subsets of the antennas, the subsets of the OFDM subcarriers being assigned to the subsets of antennas based on feedback information determined from the preamble portions of the corresponding ones of the frames, wherein the feedback information is determined via a maximum ratio combining receiver, the feedback information is received from the one or more terminals, the feedback information comprising measurements of each of the subcarriers made by each of the one or more terminals, the information is transmitted using transmission parameters derived based on the feedback information, and the transmission parameters are selected to reduce a transmission power or increase a transmission rate to at least one of the terminals.