Method and apparatus for processing data for transmission in a multi-channel communication system using selective channel inversion
First Claim
1. A method for processing data for transmission over multiple transmission channels in a multi-channel communication system, comprising:
- determining characteristics of a plurality of transmission channels available for data transmission;
selecting one or more available transmission channels based on the determined characteristics and a threshold;
coding data for the selected transmission channels based on a common coding scheme to provide coded data;
modulating the coded data for the selected transmission channels based on a common modulation scheme to provide modulation symbols; and
weighting modulation symbols for each selected transmission channel based on a respective weight indicative of a transmit power level for the selected transmission channels and derived based in part on the determined characteristics of the selected transmission channels,wherein use of the common coding scheme and the common modulation scheme results in approximately the same bit rate for the selected transmission channels.
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Abstract
Techniques to process data for transmission over a set of transmission channels selected from among all available transmission channels. In an aspect, the data processing includes coding data based on a common coding and modulation scheme to provide modulation symbols and pre-weighting the modulation symbols for each selected channel based on the channel'"'"'s characteristics. The pre-weighting may be achieved by “inverting” the selected channels so that the received SNRs are approximately similar for all selected channels. With selective channel inversion, only channels having SNRs at or above a particular threshold are selected, “bad” channels are not used, and the total available transmit power is distributed across only “good” channels. Improved performance is achieved due to the combined benefits of using only the NS best channels and matching the received SNR of each selected channel to the SNR required by the selected coding and modulation scheme.
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Citations
17 Claims
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1. A method for processing data for transmission over multiple transmission channels in a multi-channel communication system, comprising:
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determining characteristics of a plurality of transmission channels available for data transmission; selecting one or more available transmission channels based on the determined characteristics and a threshold; coding data for the selected transmission channels based on a common coding scheme to provide coded data; modulating the coded data for the selected transmission channels based on a common modulation scheme to provide modulation symbols; and weighting modulation symbols for each selected transmission channel based on a respective weight indicative of a transmit power level for the selected transmission channels and derived based in part on the determined characteristics of the selected transmission channels, wherein use of the common coding scheme and the common modulation scheme results in approximately the same bit rate for the selected transmission channels. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A transmitter unit in a multi-channel communication system, comprising:
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a controller configured to receive channel state information (CSI) indicative of characteristics of a plurality of transmission channels available for data transmission and to select one or more available transmission channels based on the channel characteristics and a threshold; a transmit data processor coupled to the controller configured to receive and code data for all selected transmission channels based on a common coding scheme to provide coded data, modulate the coded data for all selected transmission channels based on a common modulation scheme to provide modulation symbols, and weight modulation symbols for the selected transmission channels based on a respective weight, wherein each weight is indicative of a transmit power level for the corresponding selected transmission channels and is derived based in part on the characteristics of the selected transmission channels, wherein use of the common coding scheme and the common modulation scheme results in approximately the same bit rate for the selected transmission channels. - View Dependent Claims (8, 9, 10, 11)
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12. A transmitter unit in a multi-channel communication system, comprising:
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means for determining characteristics of a plurality of transmission channels available for data transmission; means for selecting one or more available transmission channels based on the determined characteristics and a threshold; means for coding data for the selected transmission channels based on a common coding scheme to provide coded data; means for modulating the coded data for the selected transmission channels based on a common modulation scheme to provide modulation symbols; and means for weighting modulation symbols for the selected transmission channel based on a respective weight indicative of a transmit power level for the selected transmission channels and derived based in part on the determined characteristics of the selected transmission channels, wherein use of the common coding scheme and the common modulation scheme results in approximately the same bit rate for the selected transmission channels. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification