Spatio-temporal processing for communication
AssigneeCisco Systems, Inc.
InventorsGregory G. Raleigh, Vincent K. Jones, IV, Michael A. Pollack
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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.
Claims32
In a digital communication system, a method for receiving via a plurality of outputs from a channel, said method comprising:
- providing a time domain substantially orthogonalizing procedure to divide said channel into output bins;
- providing one or more spatial directions for communication defined by corresponding weightings among said channel outputs wherein each output 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 output;
- and
- receiving information via subchannels of said channel by employing at least two independent parallel applications of said time domain substantially orthogonalizing procedure, each subchannel defined by a combination of output bin and spatial direction.
A receiver system for receiving via a plurality of outputs from a channel, said receiver system comprising:
- at least one processing element that applies a time domain substantially orthogonalizing procedure to divide said channel into output bins;
- a spatial processor employing weightings among said channel outputs to define spatial directions wherein each output 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 output;
- and
- wherein said receiver system receives information via subchannels of said channel, by employing at least two independent parallel applications of said time domain substantially orthogonalizing procedure by said at least one processing element, each of said subchannels being defined by a combination of output bin and spatial direction.
A receiver system that receives a burst of time domain symbols via an output of a channel, said receiver system comprising:
- at least one processing element that performs a time domain substantially orthogonalizing procedure on said burst of time domain symbols to recover a bust of frequency domain symbols;
- and
- a channel estimation processor that receives at least v training symbols belonging to said burst of frequency domain symbols, v being an extent in symbol periods of a duration of significant terms of an impulse response of said channel, applies an inverse of said time domain substantially orthogonalizing procedure to said received at least v training symbols to obtain a time domain response for said channel, and that applies said time domain substantially orthogonalizing procedure to a zero-padded version of said time domain response to obtain a frequency response for said channel.
Dependencies are inferred from the claim text.