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;
allocating a total transmit power to the one or more data streams based on the selected transmission scheme; and
processing the one or more data streams based on the selected transmission scheme.
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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.
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Citations
50 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; allocating a total transmit power to the one or more data streams based on the selected transmission scheme; and processing the one or more data streams based on the selected transmission scheme. - 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, 25)
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26. 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; allocating a total transmit power to the one or more data streams based on the selected transmission scheme; and processing the one or more data streams based on the selected transmission scheme. - View Dependent Claims (27)
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28. A method for transmitting data in a multiple-input multiple-output (MIMO) communication system, comprising:
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identifying a specific one of a plurality of transmission channels based on their achieved performance; determining a vector of phase values corresponding to the selected transmission channel, one phase value for each of a plurality of transmit antennas used for data transmission; allocating a total transmit power to each of the plurality of transmit antennas; processing data based on a particular coding and modulation scheme; and transmitting the processed data from each of the plurality of transmit antennas at the allocated transmit power and with a phase determined by the phase value associated with the transmit antenna. - View Dependent Claims (29)
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30. A computer-readable medium having computer usable instructions stored thereon for execution by a processor to perform a method for facilitating data transmission over a plurality of transmission channels in a wireless communication system, comprising:
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code for causing a computer to determine an operating condition of the communication system; code for causing a computer to select a specific power allocation transmission scheme from among a plurality of possible power allocation transmission schemes based on the determined operating condition; code for causing a computer to determine one or more data streams to be transmitted based on the selected transmission scheme; code for causing a computer to allocate a total transmit power to the one or more data streams based on the selected transmission scheme; and code for causing a computer to direct processing the one or more data streams based on the selected transmission scheme.
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31. 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; means for allocating a total transmit power to the one or more data streams based on the selected transmission scheme; and means for processing the one or more data streams based on the selected transmission scheme. - View Dependent Claims (32, 33, 34, 35)
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36. An apparatus in a multiple-input multiple-output (MIMO) communication system, comprising:
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means for determining an operating signal-to-noise-and-interference ratio (SNR) of the MIMO system; means for 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; means for determining one or more data streams to be transmitted based on the selected transmission scheme; means for allocating a total transmit power to the one or more data streams based on the selected transmission scheme; and means for processing the one or more data streams based on the selected transmission scheme.
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37. A controller in a wireless communication system, comprising:
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means for receiving 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; means for allocating a total transmit power to the one or more data streams based on the selected transmission scheme; and means for directing processing of the one or more data streams based on the selected transmission scheme. - View Dependent Claims (38, 39)
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40. 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; allocating a total transmit power to the one or more data streams 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. - View Dependent Claims (41, 42, 43, 44, 45)
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46. 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 a total transmit power is allocated to the one or more data streams based on the selected transmission scheme. - View Dependent Claims (47, 48, 49)
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50. A receiver apparatus in a wireless communication system, comprising:
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means for processing 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; means for processing the at least one recovered symbol stream in accordance with at least one demodulation and decoding scheme to provide decoded data; and means for processing the CSI for transmission back to a transmitter apparatus, 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 transmission data streams are transmitted to the receiver apparatus based on the selected power allocation transmission scheme, and wherein a total transmit power is allocated to the one or more data streams based on the selected transmission scheme.
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Specification