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AssigneeArrayComm, Inc.
InventorsJames V. Steele, Todd H. Chauvin, Adam B. Kerr, Athanasios A. Kasapi
Estimating the term…
Spatial and temporal characteristics of received radio signals in a multiple user radio system can be estimated based on signals received from the users. In one embodiment, the invention includes collecting measurements of radio frequency signals received at different elements of an antenna system over time, the received signals corresponding at least in part to transmissions received from a system user, collecting representations of the transmissions of the system user, cross-correlating the collected measurements and the collected representations, and comparing the cross-correlation to the collected measurements to form a characterization of the radio channel traversed by transmissions of the system user.
A method comprising:
8 The method of claim 7, wherein collecting representations comprises building a matrix with a column for each of a plurality of different user sand a row corresponding to different samples of transmission of each respective user.
The method of claim 8, wherein comparing comprises multiplying the cross-correlation with the inverse of the product of the representations matrix multiplied by its transpose and complex conjugate to form a matrix of estimated spatial signatures.
The method of claim 8, wherein comparing comprises cross-correlating the first matrix with itself to form a second cross-correlation matrix and multiplying the first cross-correlation matrix with the inverse of the product of the second cross-correlation matrix multiplied by its transpose and complex conjugate.
A machine-readable medium having stored thereon data representing instructions which, when executed by a machine, cause the machine to perform operations comprising:
18 The method of claim 17, wherein the instructions for collecting representations comprise instructions which, when executed by the machine, cause the machine to perform further operations comprising building a matrix with a column for each of a plurality of different user sand a row corresponding to different samples of transmission of each respective user.
The method of claim 18, wherein the instructions for comparing comprise instructions which, when executed by the machine, cause the machine to perform further operations comprising multiplying the cross-correlation with the inverse of the product of the representations matrix multiplied by its transpose and complex conjugate to form a matrix of estimated spatial signatures.
The method of claim 18, wherein the instructions for comparing comprise instructions which, when executed by the machine, cause the machine to perform further operations comprising cross-correlating the first matrix with itself to form a second cross-correlation matrix and multiplying the first cross-correlation matrix with the inverse of the product of the second cross-correlation matrix multiplied by its transpose and complex conjugate.
An apparatus comprising:
Dependencies are inferred from the claim text.