Data transmission with non-uniform distribution of data rates for a multiple-input multiple-output (MIMO) system
First Claim
1. A wireless communication device comprising:
- a plurality of antennas configured to receive a plurality of symbol streams;
a first processor configured to process the plurality of received symbol streams and to provide a plurality of detected symbol streams, one detected symbol stream for each stage of a successive interference cancellation processing; and
a second processor configured to process each detected symbol stream to provide a corresponding decoded data stream and to determine a received signal-to-noise-and-interference ratio (SNR) and an effective SNR for each of the plurality of detected symbol streams based on the received SNR.
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Abstract
Techniques to determine data rates for a number of data streams transmitted via a number of transmission channels (or transmit antennas) in a multi-channel (e.g., MIMO) communication system. In one method, the “required” SNR for each data rate to be used is initially determined, with at least two data rates being unequal. The “effective” SNR for each data stream is also determined based on the received SNR and successive interference cancellation processing at the receiver to recover the data streams. The required SNR for each data stream is then compared against its effective SNR. The data rates are deemed to be supported if the required SNR for each data stream is less than or equal to its effective SNR. A number of sets of data rates may be evaluated, and the rate set associated with the minimum received SNR may be selected for use for the data streams.
133 Citations
29 Claims
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1. A wireless communication device comprising:
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a plurality of antennas configured to receive a plurality of symbol streams; a first processor configured to process the plurality of received symbol streams and to provide a plurality of detected symbol streams, one detected symbol stream for each stage of a successive interference cancellation processing; and a second processor configured to process each detected symbol stream to provide a corresponding decoded data stream and to determine a received signal-to-noise-and-interference ratio (SNR) and an effective SNR for each of the plurality of detected symbol streams based on the received SNR. - View Dependent Claims (2, 3, 4, 5)
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6. A method for determining data rates for a plurality of data streams to be transmitted via a plurality of transmission channels, comprising:
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determining a required channel state information parameter for each of a plurality of data rates that may be used for the plurality of data streams, wherein at least two of the data rates are unequal; comparing the required channel state information parameter for each data stream against an effective channel state information parameter for the data stream; and determining whether or not some of the plurality of data rates are supported based on comparing. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14)
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15. An apparatus in a multi-channel communication system, comprising:
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means for determining a required channel state information parameter for each of a plurality of data rates that may be used for the plurality of data streams; means for comparing the required channel state information parameter for each data stream against an effective channel state information parameter for the data stream; and means for determining whether or not some of the plurality of data rates are supported based on comparing. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A computer readable medium embodying instructions for performing a method for determining data rates for a plurality of data streams to be transmitted via a plurality of transmission channels, the method comprising:
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determining a required channel state information parameter for each of a plurality of data rates that may be used for the plurality of data streams, wherein at least two of the data rates are unequal; comparing the required channel state information parameter for each data stream against an effective channel state information parameter for the data stream; and determining whether or not some of the plurality of data rates are supported based on comparing. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29)
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Specification