Interference-excising diversity receiver adaptation using frame synchronous signal features and attributes
OwnerBrian G. Ageeinventor
Life of this patent
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Abstract
An apparatus and digital signal processing means are disclosed for excision of co-channel interference from signals received in crowded or hostile environments using spatial/polarization diverse arrays, which reliably and rapidly identifies signals with transmitted features that are almost-periodic over known framing intervals, and exploits those features to develop diversity combining weights that substantively extract those signals from that environment, based on differing diversity signature, timing offset, and carrier offset of those signals. In one embodiment, the signal identification and extraction is performed in an appliqué that can be implemented without coordination with an actual radio transceiver.
Claims14
A method for digital signal processing for a radio operating in a complex environment of multiple analog radio signals-in-space comprising at least one signal of interest (SOI) and at least one signal not of interest (SNOI), said radio having a plurality of any of spatially and polarization diverse antenna feeds, said method also implementing framing intervals and further comprising:
- transforming the SOI between an analog representation and a digital representation thereof, respectively:
- from analog to digital when receiving the signals-in-space;
- and,
- from digital to analog;
- identifying in the signals-in-space, through any combination of a spatial array and polarization array of the plurality of any of spatially and polarization diverse antenna feeds, a SOI with at least one transmitted feature that is synchronous with a known periodicity;
- developing a set of diversity combining weights from the at least one transmitted feature;
- and,
- implementing dynamic interference cancellation and excision (DICE) of the SNOI with the set of diversity combining weights,
- wherein the step of transforming the SOI between an analog representation and a digital representation thereof, further comprises using a direct-conversion transceiver which:
- frequency-shifts the signal-in-space received from the plurality of any of spatially and polarization diverse antenna feeds to complex-baseband, prior to being input to a DICE digital signal processing (DSP) subsystem;
- and,
- frequency-shifts the output from the DICE DSP subsystem from the complex-baseband to the SOI band prior to input to the radio as an analog radio signal.
A method for digital signal processing for a Mobile User Objective System (MUOS) radio operating in a complex environment of multiple analog radio signals-in-space comprising at least one signal of interest (SOI) and at least one signal not of interest (SNOI), said radio having a plurality of any of spatially and polarization diverse antenna feeds, said method also implementing framing intervals and further comprising:
- transforming a MUOS SOI between an analog representation and a digital representation thereof, respectively:
- from analog to digital when receiving the signals-in-space;
- and,
- from digital to analog;
- identifying in the signals-in-space, through any combination of a spatial array and polarization array of the plurality of any of spatially and polarization diverse antenna feeds, a SOI with at least one transmitted feature that is synchronous with a known periodicity;
- developing a set of diversity combining weights from the at least one transmitted feature;
- and,
- implementing dynamic interference cancellation and excision (DICE) of the SNOI with the set of diversity combining weights,
- wherein the step of transforming the SOI between an analog representation and a digital representation thereof, further comprises using a direct-conversion transceiver which:
- frequency-shifts the signal-in-space received from the plurality of any of spatially and polarization diverse antenna feeds to complex-baseband, prior to being input to a DICE digital signal processing (DSP) subsystem;
- and,
- frequency-shifts the output from the DICE DSP subsystem from the complex-baseband to the SOI band prior to input to the radio as an analog radio signal.
Dependencies are inferred from the claim text.