Spatio-temporal processing for communication
First Claim
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1. A method for transmitting into a channel via a plurality of antenna elements, said method comprising:
- for each of a plurality of orthogonal frequency subchannels, establishing a plurality of spatial subchannels for communication from a transmitter to a receiver, each spatial subchannel defined by one or more weights among said plurality of antenna elements;
for at least one of said orthogonal frequency subchannels, distributing information among said plurality of spatial subchannels in accordance with spatial subchannel quality; and
for said at least one of said orthogonal frequency subchannels, transmitting said information via said plurality of spatial subchannels by employing said plurality of antenna elements.
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Abstract
A space-time signal processing system with advantageously reduced complexity. The system may take advantage of multiple transmitter antenna elements and/or multiple receiver antenna element or multiple polarizations of a single transmitter antenna element and/or single receiver antenna element. The system is not restricted to wireless contexts and may exploit any channel having multiple inputs or multiple outputs and certain other characteristics. Multi-path effects in a transmission medium cause a multiplicative increase in capacity.
217 Citations
21 Claims
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1. A method for transmitting into a channel via a plurality of antenna elements, said method comprising:
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for each of a plurality of orthogonal frequency subchannels, establishing a plurality of spatial subchannels for communication from a transmitter to a receiver, each spatial subchannel defined by one or more weights among said plurality of antenna elements;
for at least one of said orthogonal frequency subchannels, distributing information among said plurality of spatial subchannels in accordance with spatial subchannel quality; and
for said at least one of said orthogonal frequency subchannels, transmitting said information via said plurality of spatial subchannels by employing said plurality of antenna elements. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for receiving from a channel via a plurality of antenna elements, said method comprising:
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receiving signals via said plurality of antenna elements;
frequency domain processing the received signals to recover orthogonal frequency subchannel information;
spatially processing said orthogonal frequency subchannel information to separate received information into a plurality of spatial subchannels, each spatial subchannel defined by one or more weights among said plurality of antenna elements; and
decoding said received information in accordance with an encoding scheme that is optimized to take advantage of multiple spatial subchannels. - View Dependent Claims (8, 9, 10, 11)
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12. Apparatus for receiving from a channel via a plurality of antenna elements, said apparatus comprising:
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a demodulation and RF system that receives signals via said plurality of antenna elements;
a frequency domain processor that recovers orthogonal frequency subchannel information from said signals;
a spatial processor that processes said orthogonal frequency subchannel information to separate received information into a plurality of spatial subchannels, each spatial subchannel defined by one or more weights among said plurality of antenna elements; and
a decoder that decodes said received information in accordance with an encoding scheme that is optimized to take advantage of multiple spatial subchannels. - View Dependent Claims (13, 14, 15, 16)
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17. Apparatus for receiving from a channel via a plurality of antenna elements, said apparatus comprising:
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means for receiving signals via said plurality of antenna elements;
means for frequency domain processing the received signals to recover orthogonal frequency subchannel information;
means for spatially processing said orthogonal frequency subchannel information to separate received information into a plurality of spatial subchannels, each spatial subchannel defined by one or more weights among said plurality of antenna elements; and
means for decoding said received information in accordance with an encoding scheme that is optimized to take advantage of multiple spatial subchannels. - View Dependent Claims (18, 19, 20, 21)
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Specification