Multiple-input, multiple-output (MIMO) systems with multiple transmission modes
First Claim
1. A method for transmitting data over a plurality of transmission channels in a wireless communication system, comprising:
- determining an operating condition of the communication system;
identifying a specific power allocation transmission scheme selected from among a plurality of possible power allocation transmission schemes based on the determined operating condition;
determining one or more data streams to be transmitted based on the selected transmission scheme; and
processing the one or more data streams based on the selected transmission scheme, wherein the operating condition is quantified by a signal-to-noise-and-interference ratio (SNR), and wherein a partial-CSI transmission scheme is selected for use if an operating SNR of the communication system is above a threshold SNR, and a beam-forming transmission scheme is selected for use if the operating SNR is below the threshold SNR.
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Accused Products
Abstract
Techniques to transmit data on a number of transmission channels in a multi-channel communication system using multiple transmission schemes requiring less channel-state information (CSI). These schemes may include a partial-CSI transmission scheme that transmits a single data stream on each transmit antenna selected for use and a “beam-forming” transmission scheme that allocates all transmit power to a single transmission channel having the best performance. Each transmission scheme may provide good or near-optimum performance for a specific range of operating conditions (or operating SNRs). These multiple transmission schemes may then be combined in a piece-wise fashion to form a “multi-mode” transmission scheme that covers the full range of operating conditions supported by the MIMO system. The specific transmission scheme to be used for data transmission at any given moment would then be dependent on the specific operating condition experienced by the system at that moment.
334 Citations
35 Claims
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1. A method for transmitting data over a plurality of transmission channels in a wireless communication system, comprising:
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determining an operating condition of the communication system;
identifying a specific power allocation transmission scheme selected from among a plurality of possible power allocation transmission schemes based on the determined operating condition;
determining one or more data streams to be transmitted based on the selected transmission scheme; and
processing the one or more data streams based on the selected transmission scheme, wherein the operating condition is quantified by a signal-to-noise-and-interference ratio (SNR), and wherein a partial-CSI transmission scheme is selected for use if an operating SNR of the communication system is above a threshold SNR, and a beam-forming transmission scheme is selected for use if the operating SNR is below the threshold SNR. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method for transmitting data on a plurality of spatial subchannels in a multiple-input multiple-output (MIMO) communication system, comprising:
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determining an operating signal-to-noise-and-interference ratio (SNR) of the MIMO system;
identifying a specific power allocation transmission scheme selected from among a plurality of possible power allocation transmission schemes based on the operating SNR, wherein each of the plurality of transmission schemes is designated for use for a respective range of operating SNRs;
determining one or more data streams to be transmitted based on the selected transmission scheme; and
processing the one or more data streams based on the selected transmission scheme, wherein the plurality of transmission schemes include a partial-CSI transmission scheme and a beam-forming transmission scheme, and wherein the partial-CSI transmission scheme is selected for use if the operating SNR is above a threshold SNR and the beam-forming transmission scheme is selected for use if the operating SNR is below the threshold SNR.
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26. An apparatus in a wireless communication system, comprising:
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means for determining an operating condition of the communication system;
means for identifying a specific power allocation transmission scheme selected from among a plurality of possible power allocation transmission schemes based on the determined operating condition;
means for determining one or more data streams to be transmitted based on the selected transmission scheme; and
means for processing the one or more data streams based on the selected transmission scheme;
wherein the specific transmission scheme is selected based on an operating signal-to-noise-and-interference ratio (SNR) of the communication system, and wherein each of the plurality of transmission schemes is designated for use for a respective range of operating SNRs, wherein the plurality of transmission schemes include a partial-CSI transmission scheme and a beam-forming transmission scheme, and wherein the partial-CSI transmission scheme is selected for use if the operating SNR is above a threshold SNR and the beam-forming transmission scheme is selected for use if the operating SNR is below the threshold SNR. - View Dependent Claims (27, 28)
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29. A transmitter unit in a wireless communication system, comprising:
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a controller operative to direct data transmission over a plurality of transmission channels by receiving an indication of an operating condition of the communication system, identifying a specific power allocation transmission scheme selected from among a plurality of possible power allocation transmission schemes based on the operating condition, determining one or more data streams to be transmitted based on the selected transmission scheme, selecting a rate for each data stream based in part on an amount of transmit power allocated to the data stream, and directing processing of the one or more data streams based on the selected transmission scheme;
a transmit (TX) data processor operative to process each data stream based on the selected rate to provide a respective stream of symbols; and
one or more transmitters operative to process one or more symbol streams to provide one or more modulated signals suitable for transmission over a communication channel;
wherein the plurality of transmission schemes include a partial-CSI transmission scheme and a beam-forming transmission scheme and wherein the controller is operative to select the partial-CSI transmission scheme if an operating signal-to-noise-and-interference ratio (SNR) of the communication system is above a threshold SNR and to select the beam-forming transmission scheme if the operating SNR is below the threshold SNR. - View Dependent Claims (30, 31, 32)
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33. A receiver unit in a wireless communication system, comprising:
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a receive (RX) MIMO processor operative to receive and process a plurality of streams of received symbols in accordance with a particular receiver processing scheme to provide at least one stream of recovered symbols, and to derive channel-state information (CSI) for each recovered symbol stream;
a RX data processor operative to process at least one recovered symbol stream in accordance with at least one demodulation and decoding scheme to provide decoded data; and
a TX data processor operative to process the CSI for transmission back to a transmitter unit, and wherein a specific power allocation transmission scheme is selected from among a plurality of possible power allocation transmission schemes based on the CSI, wherein one or more data streams are transmitted to the receiver unit based on the selected power allocation transmission scheme, wherein total available transmit power is allocated to the one or more data streams based on the selected power allocation transmission scheme, wherein the plurality of transmission schemes include a partial-CSI transmission scheme and a beam-forming transmission scheme, and wherein the partial-CSI transmission scheme is selected if an operating signal-to-noise-and-interference ratio (SNR) is above a threshold SNR and the beam-forming transmission scheme is selected if the operating SNR is below the threshold SNR. - View Dependent Claims (34, 35)
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Specification