Telecommunications – Receiver or analog modulated signal frequency converter – Noise or interference elimination
Patent
1997-01-17
1999-12-28
To, Doris H.
Telecommunications
Receiver or analog modulated signal frequency converter
Noise or interference elimination
455126, 455116, 455314, 375349, H04B 110
Patent
active
06009317&
ABSTRACT:
In a complex signal receiver, quadrature imbalances in phase angle and amplitude are detected and compensated. A known signal is applied to a quadrature receiver and converted into inphase and quadrature baseband signals. A signal processor determines an imbalance between the inphase and quadrature signals of the known signal and generates one or more correction factors in response to the determined imbalance. The correction factors are applied to subsequently received inphase and quadrature baseband signals to minimize the imbalance between the subsequently received inphase and quadrature baseband signals. The imbalance compensation and correction technique is also useful to quadrature transmitters that employ feedback control. The quadrature imbalance detection and correction circuitry may be integrated on the same integrated circuit chip as the receiver circuitry to provide a single, universal receiver chip.
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patent: 5604746 (1997-02-01), Oto
Ericsson Inc.
To Doris H.
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