METHOD AND APPARATUS FOR PROCESSING DATA FOR TRANSMISSION IN A MULTI-CHANNEL COMMUNICATION SYSTEM USING SELECTIVE CHANNEL INVERSION
First Claim
1. A method for transmitting data by a transmitter over multiple transmission channels to a receiver in a multi-channel communication system, comprising:
- selecting one or more available transmission channels from a plurality of transmission channels for use for data transmission, wherein the selected transmissions channels have signal to noise ratios (SNRs) at or above a threshold value;
coding and modulating data for transmission over the selected transmission channels using a common coding and modulation scheme to provide modulation symbols;
weighting the modulation symbols for each selected transmission channel based on channel state information (CSI) for the selected channels, in an effort to distribute the total available transmit power across the selected transmission channels to achieve similar received signal quality; and
transmitting the weighted modulation symbols on 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.
78 Citations
15 Claims
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1. A method for transmitting data by a transmitter over multiple transmission channels to a receiver in a multi-channel communication system, comprising:
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selecting one or more available transmission channels from a plurality of transmission channels for use for data transmission, wherein the selected transmissions channels have signal to noise ratios (SNRs) at or above a threshold value; coding and modulating data for transmission over the selected transmission channels using a common coding and modulation scheme to provide modulation symbols; weighting the modulation symbols for each selected transmission channel based on channel state information (CSI) for the selected channels, in an effort to distribute the total available transmit power across the selected transmission channels to achieve similar received signal quality; and transmitting the weighted modulation symbols on the selected transmission channels. - View Dependent Claims (2, 3, 4, 5, 10, 12, 13, 14)
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6. A transmitter for use in a receiver in a multi-channel communication system, comprising:
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a controller configured to select one or more available transmission channels from a plurality of transmission channels for use for data transmission, wherein the selected transmissions channels have signal to noise ratios (SNRs) at or above a threshold value; a transmit data processor configured to code and modulate data for transmission over the selected transmission channels using a common coding and modulation scheme to provide modulation symbols, weight the modulation symbols for each selected transmission channel based on channel state information (CSI) for the selected channels, in an effort to distribute the total available transmit power across the selected transmission channels to achieve similar received signal quality, and transmit the weighted modulation symbols on the selected transmission channels. - View Dependent Claims (7, 8, 9)
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11. An apparatus for transmitting data by a transmitter over multiple transmission channels to a receiver in a multi-channel communication system, comprising:
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means for selecting one or more available transmission channels from a plurality of transmission channels for use for data transmission, wherein the selected transmissions channels have signal to noise ratios (SNRs) at or above a threshold value; means for coding and modulating data for transmission over the selected transmission channels using a common coding and modulation scheme to provide modulation symbols; means for weighting the modulation symbols for each selected transmission channel based on channel state information (CSI) for the selected channels, in an effort to distribute the total available transmit power across the selected transmission channels to achieve similar received signal quality; and means for transmitting the weighted modulation symbols on the selected transmission channels. - View Dependent Claims (15)
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Specification