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US 6,958,782 B2Granted
Frequency converter
AssigneeSamsung Electronics Co., Ltd.
InventorTakahiko Kishi
Life of this patent
Estimating the term…
Abstract
There is provided a frequency converter for suppressing generation of an image signal using a simple adaptive algorithm. In the frequency converter, an orthogonal converter 21 converts an RF/IF signal to a complex signal along with frequency conversion and ADCs quantize the complex signal. An image signal canceller achieves the complex conjugate of the quantized complex signal by inverting the imaginary part of the quantized signal through a multiplier. An LMS core adaptively processes the complex signal using the complex conjugate signal as a reference signal and the output of the image signal canceller as an error signal. The resulting cancellation signals are level-matched in attenuators. Subtracters combine the complex signal with the level-adjusted complex conjugate signal.
Claims29
A frequency converter comprising:
- one of an orthogonal converter for receiving a real signal and outputting a complex signal, and a complex mixer for receiving a complex signal and outputting a complex signal;
- means for obtaining the complex conjugate of the complex signal received from the one of the orthogonal converter and the complex mixer;
- means for adjusting the level of the complex conjugate signal;
- and
- means for combining the complex signal received from the one of the orthogonal converter and the complex mixer with the level-adjusted complex conjugate signal.
2 more elements
A frequency converter comprising:
- one of an orthogonal converter for receiving a real signal and outputting a complex signal, and a complex mixer for receiving a complex signal and outputting a complex signal;
- a first multiplier for obtaining the complex conjugate of the complex signal received from the one of the orthogonal converter and the complex mixer by inverting the sign of the imaginary part of the complex signal;
- a second multiplier for multiplying the real part of the complex conjugate signal by an integer predetermined to adjust the level of the complex conjugate signal;
- a third multiplier for multiplying the imaginary part of the complex conjugate signal by the integer;
- a first subtracter for subtracting the output of the second multiplier from the real part of the complex signal received from the one of the orthogonal converter and the complex mixer;
- and
- a second subtracter for subtracting the output of the third multiplier from the imaginary part of the complex signal received from the one of the orthogonal converter and the complex mixer.
4 more elements
A frequency converter comprising:
- one of an orthogonal converter for receiving a real signal and outputting a complex signal, and a complex mixer for receiving a complex signal and outputting a complex signal;
- a first multiplier for multiplying the real part of the complex signal received from the one of the orthogonal converter and the complex mixer by an integer predetermined to adjust signal level;
- a second multiplier for inverting the sign of the imaginary part of the complex signal received from the one of the orthogonal converter and the complex mixer and multiplying the inverted imaginary part by the predetermined integer;
- a first subtracter for subtracting the output of the first multiplier from the real part of the complex signal;
- and
- a second subtracter for subtracting the output of the second multiplier from the imaginary part of the complex signal.
3 more elements
A frequency converter comprising:
- one of an orthogonal converter for receiving a real signal and outputting a complex signal, and a complex mixer for receiving a complex signal and outputting a complex signal;
- an analog-to-digital converter (ADC) for quantizing the complex signal received from the one of the orthogonal converter and the complex mixer;
- a first multiplier for obtaining the complex conjugate of the quantized complex signal by inverting the imaginary part of the quantized complex signal;
- a second multiplier for multiplying the real part of the complex conjugate signal by an integer predetermined to adjust the level of the complex conjugate signal;
- a third multiplier for multiplying the imaginary part of the complex conjugate signal by the predetermined integer;
- a first subtracter for subtracting the output of the second multiplier from the real part of the complex signal received from the one of the orthogonal converter and the complex mixer;
- and
- a second subtracter for subtracting the output of the third multiplier from the imaginary part of the complex signal received from the one of the orthogonal converter and the complex mixer.
5 more elements
A frequency converter comprising:
- one of an orthogonal converter for receiving a real signal and outputting a complex signal, and a complex mixer for receiving a complex signal and outputting a complex signal;
- an ADC for quantizing the complex signal received from the one of the orthogonal converter and the complex mixer;
- a first multiplier for multiplying the real part of the quantized complex signal by an integer predetermined to adjust signal level;
- a second multiplier for inverting the sign of the imaginary part of the quantized complex signal and multiplying the inverted imaginary part by the predetermined integer;
- a first subtracter for subtracting the output of the first multiplier from the real part of the complex signal;
- and
- a second subtracter for subtracting the output of the second multiplier from the imaginary part of the complex signal.
4 more elements
Dependencies are inferred from the claim text.