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US 5,848,105 AGranted
GMSK signal processors for improved communications capacity and quality
OwnerWilliam A. Gardner, Stephan V. Schellinventors
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OwnerWilliam A. Gardner, Stephan V. Schellinventors
Estimating the term…
A method and apparatus for separating and removing distortion from interfering co-channel signals and suppressing adjacent-channel interfering signals of the Gaussian Minimum-Shift Keyed (GMSK) or other MSK type with filtering structures that exploit the cyclostationarity of the received GMSK or other MSK signals in order to accommodate a greater number (or the same number, but with greater quality) of transmitted signals received by one or more antennas than can be accommodated by existing filters. The parameters in these filtering structures are adapted by either of two adaptation apparatus that exploit both the known training sequence that is transmitted in most wireless communications systems, and the constant modulus property exhibited by each of the transmitted GMSK or other MSK signals.
An apparatus for extracting a signal of interest from a plurality of spectrally and temporally overlapping input signals containing digital data having a bit rate, said input signals having carrier frequencies, said input signals having conjugate cycle frequencies equal to twice their carrier frequencies plus and minus one-half of their data bit rate, said input signals exhibiting conjugate spectral redundancy for spectral components having frequencies separated by said conjugate cycle frequencies, said input signals exhibiting temporal redundancy, said apparatus comprising:
An apparatus for extracting a signal of interest from a plurality of spectrally and temporally overlapping communications signals, said communications signals having real and imaginary components, said communications signals having carrier frequencies, said communications signals containing digital data having a bit rate, said communications signals exhibiting temporal redundancy, said communications signals having conjugate cycle frequencies equal to twice their carrier frequencies plus and minus one-half of their data bit rate, said communications signals exhibiting conjugate spectral redundancy for spectral components having frequencies separated by said conjugate cycle frequencies, said apparatus comprising:
An apparatus for extracting a signal of interest from a plurality of spectrally and temporally overlapping communications signals containing digital data having a bit rate, said communications signals having carrier frequencies, said communications signals having conjugate cycle frequencies equal to twice their carrier frequencies plus and minus one-half of their data bit rate, said communications signals exhibiting conjugate spectral redundancy for spectral components having frequencies separated by said conjugate cycle frequencies, said communications signals exhibiting temporal redundancy, said apparatus comprising:
Dependencies are inferred from the claim text.