Transmitter incorporating spatio-temporal processing
AssigneeCisco Systems, Inc.
InventorGregory G. Raleigh
Life of this patent
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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 elements, 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.
Claims30
In a digital communication system, a method for transmitting via a plurality of inputs to a channel, said method comprising:
- providing a time domain substantially orthogonalizing procedure to divide said channel into input bins;
- providing one or more spatial directions for communication defined by corresponding weightings among said channel inputs wherein each input bin has at least one associated spatial direction, said weightings defining said one or more spatial directions so that each spatial direction corresponds to communication via more than one channel input;
- and
- transmitting said information in subchannels of said channel by employing at least two independent parallel applications of an inverse of said time domain substantially orthogonalizing procedure, said subchannels being defined by a combination of input bin and spatial direction.
A transmitter system for transmitting via a plurality of inputs to a channel, said transmitter system comprising:
- at least one processing element that applies an inverse of a time domain substantially orthogonalizing procedure to divide said channel into input bins;
- a spatial processor employing weightings among said channel inputs to define spatial directions wherein each input bin has at least one associated spatial direction, said weightings defining said one or more spatial directions so that each spatial direction corresponds to communication via more than one channel input;
- and
- wherein said transmitter system transmits information in subchannels of said channel, each of said subchannels being defined by a combination of input bin and spatial direction, by employing said at least one processing element for at least two independent applications of said inverse of said time domain substantially orthogonalizing procedure.
Dependencies are inferred from the claim text.