Method and system for providing multi-input-multi-output (MIMO) downlink transmission
First Claim
1. A method for supporting transmission of audio/video data in a multi-input-multi-output (MIMO) communication system including a plurality of terminals, the method comprising:
- receiving a satellite signal and shifting a frequency of the received signal;
transmitting a preamble portion of a frame from a plurality of antennas to the terminals over a downlink channel using Orthogonal Frequency Division Multiplexing (OFDM), each of the antennas being assigned a distinct subset of OFDM sub-carriers, wherein each of the terminals determines a characteristic that specifies a complete frequency response of the channel over an entire allocated bandwidth, with respect to the antennas as feedback information;
receiving the feedback information from the terminals over a return channel that is of a lower transmission rate than the downlink channel; and
selecting, according to the feedback information for the associated frame, a subset of the antennas for transmission of a remaining portion of the frame to the terminals, wherein at least one of the terminals is not within a line of sight of the subset of antennas.
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Accused Products
Abstract
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.
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Citations
20 Claims
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1. A method for supporting transmission of audio/video data in a multi-input-multi-output (MIMO) communication system including a plurality of terminals, the method comprising:
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receiving a satellite signal and shifting a frequency of the received signal; transmitting a preamble portion of a frame from a plurality of antennas to the terminals over a downlink channel using Orthogonal Frequency Division Multiplexing (OFDM), each of the antennas being assigned a distinct subset of OFDM sub-carriers, wherein each of the terminals determines a characteristic that specifies a complete frequency response of the channel over an entire allocated bandwidth, with respect to the antennas as feedback information; receiving the feedback information from the terminals over a return channel that is of a lower transmission rate than the downlink channel; and selecting, according to the feedback information for the associated frame, a subset of the antennas for transmission of a remaining portion of the frame to the terminals, wherein at least one of the terminals is not within a line of sight of the subset of antennas. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A hub device for supporting transmission of audio/video data in a multi-input-multi-output (MIMO) communication system including a plurality of terminals, the device comprising:
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means for receiving a signal from a satellite system; means for transmitting a preamble portion of a frame from a plurality of antennas to the terminals over a downlink channel using Orthogonal Frequency Division Multiplexing (OFDM), each of the antennas being assigned a distinct subset of OFDM sub-carriers, wherein each of the terminals determines a characteristic that specifies a complete frequency response of the channel over an entire allocated bandwidth, with respect to the antennas as feedback information; means for receiving the feedback information from the terminals over a return channel that is of a lower transmission rate than the downlink channel; and a processor configured to select, according to the feedback information for the associated frame, a subset of the antennas among a plurality of antennas for transmission of a remaining portion of the frame to the terminals, wherein at least one of the terminals is not within a line of sight of the subset of antennas. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method for distributing audio/video information in a point-to-multipoint multiple access system including a hub communicating with a plurality of terminals, the method comprising:
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receiving a satellite signal having a first frequency; converting the received signal to a second frequency different from the first frequency; providing a personal computer with internet access via the satellite signal; generating a preamble symbol according to an Orthogonal Frequency Division Multiplexing (OFDM) scheme, wherein all OFDM sub-carriers are divided uniformly into a plurality of sub-carrier sets, the sub-carrier sets being assigned to a respective plurality of antennas of the hub, wherein the subset assignment is different from frame to frame; transmitting the preamble symbol over a downlink channel, based on the sub-carrier set assignment, to the terminals for determination of channel response by the respective terminals to provide feedback information to the hub over a return channel that is of a lower transmission rate than the downlink channel, wherein at least one of the terminals is not within a line of sight of the subset of antennas; receiving the feedback information from the terminals; and mapping data symbols associated with the preamble symbol to one or more of the antennas, according to the feedback information, for transmission to the terminals.
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18. A point-to-multipoint multiple access system for distributing audio/video information, the system comprising:
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a hub configured to receive a satellite signal having a first frequency, convert the received signal to a second frequency different from the first frequency, providing a personal computer with internet access via the satellite signal, generate a preamble symbol according to an Orthogonal Frequency Division Multiplexing(OFDM) scheme, wherein all OFDM sub-carriers are divided uniformly into a plurality of sub-carrier sets, the sub-carrier sets being assigned to a respective plurality of antennas of the hub, wherein the subset assignment is different from frame to frame; and a plurality of terminals communicating with the hub, wherein the hub transmits the preamble symbol over a downlink channel, based on the sub-carrier set assignment, to the terminals for determination of channel response by the respective terminals to provide feedback information to the hub over a return channel that is of a lower transmission rate than the downlink channel, wherein at least one of the terminals is not within a line of sight of the subset of antennas, and wherein the hub is further configured to map data symbols associated with the preamble symbol to one or more of the antennas, according to the feedback information, for transmission to the terminals.
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19. A method for supporting transmission of audio/video data in a multi-input-multi-output (MIMO) communication system including a plurality of terminals, the method comprising:
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receiving a satellite signal and shifting a frequency of the received signal; transmitting a preamble portion of a frame from a plurality of antennas to the terminals over a channel using Orthogonal Frequency Division Multiplexing (OFDM), each of the antennas being assigned a distinct subset of OFDM sub-carriers, wherein the subset assignment is different from frame to frame, and wherein each of the terminals determines a characteristic that specifies a complete frequency response of the channel over an entire allocated bandwidth, with respect to the antennas as feedback information; receiving the feedback information from the terminals; and selecting, according to the feedback information for the associated frame, a subset of the antennas for transmission of a remaining portion of the frame to the terminals, wherein at least one of the terminals is not within a line of sight of the subset of antennas. - View Dependent Claims (20)
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Specification