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US 2014/0177761 A1Published application
Method and apparatus for providing an enhanced zero-if receiver architecture for a wireless communications system
AssigneeHughes Network Systems, LLC
InventorsKumud Patel, Sachin Lal, Minheng Shan, Mark Steber
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Abstract
An approach includes injecting a plurality of equal amplitude tones across a frequency band. The approach also includes determining frequency response based on the injected tones, determining an imbalance parameter associated with a quadrature down-converter based on the determined frequency response; determining one or more parameters for wideband quadrature compensation based on the determined frequency response, and compensating an input signal based on the determined imbalance parameter and the determined one or more parameters for the wideband quadrature compensation.
Claims20
A method comprising:
- injecting a plurality of equal amplitude tones across a frequency band;
- determining one or more frequency responses based on the injected tones;
- determining an imbalance parameter associated with a quadrature down-converter based on the determined one or more frequency responses;
- determining one or more parameters for wideband quadrature imbalance compensation based on the determined one or more frequency response;
- down-converting an input RF signal by the quadrature down-converter;
- providing DC off-set compensation of the I and Q components of an intermediate signal, wherein the intermediate signal represents in-phase (I) and quadrature (Q) components of the quadrature down converter;
- and
- compensating the intermediate signal based on the determined one or more parameters for wideband quadrature compensation.
5 more elements
An apparatus comprising:
- a quadrature down-converter configured to down-convert an input RF signal;
- a DC offset compensator configured to compensate DC offset in in-phase (I) and quadrature (Q) components of an intermediate signal representing the I/Q components of the quadrature down-converter;
- and
- a wideband imbalance compensator configured to compensate wideband imbalance in the I/Q components of the intermediate signal based at least in part on one or more imbalanced compensation parameters;
- and
- wherein the one or more imbalanced compensation parameters are determined based in part on injecting a plurality of equal amplitude tones across a frequency band, determining one or more frequency responses based on the injected tones, determining an imbalance parameter associated with the quadrature down-converter based on the determined one or more frequency responses, and determining one or more imbalanced compensation parameters based on the determined one or more frequency responses.
3 more elements
A system comprising:
- an antenna configured to receive an RF input signal;
- one or more bandpass filters configured to attenuate out of band signals off the RF input signal;
- a linear RF amplifier and an automatic gain controlled RF amplifier configured to amplify the input RF signal;
- a quadrature down-converter configured to down-convert the RF input signal to an intermediate signal;
- an analogue to digital converter configured to convert the in-phase (I) and quadrature (Q) components of the quadrature down-converter into an intermediate signal;
- a processor and a memory unit configured to realize a wideband quadrature imbalance compensator, wherein the wideband quadrature imbalance compensator is realized as one or more Finite Impulse Response filters;
- and
- wherein the coefficients of the FIR filters are determined based at least in part on injecting a plurality of equal amplitude tones across a frequency band, determining one or more frequency responses based on the injected tones, determining an imbalance parameter associated with the quadrature down-converter based on the determined one or more frequency responses, and determining one or more imbalanced compensation parameters based on the determined one or more frequency responses.
5 more elements
Dependencies are inferred from the claim text.