Communication system calibration method and calibration device
A correction method and technology of a correction device, which are applied in baseband system components, DC level restoration device/bias distortion correction, and shaping network in transmitter/receiver, etc., can solve image interference, signal quality degradation, two groups of Incomplete matching of components, etc., to achieve the effect of the best communication performance
Active Publication Date: 2019-03-01
REALTEK SEMICON CORP
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Problems solved by technology
The second is that there will inevitably be imperfect conditions in the circuit technology, so that the two groups of components on the in-phase path and the quadrature path will not completely match each other, such as the low-pass filter on the in-phase path and the quadrature path ( Low-pass filter, LPF), analog-to-digital converter (analog-to-digital converter, ADC), digital-to-analog converter (digital-to-analog converter, DAC) or gain amplifier (gain amplifier) and other components do not match, As a result, there will be a difference between the signals passing through the in-phase path and the quadrature path. When the signal passes through the in-phase path and the quadrature path that do not match each other, an image interference signal (such as figure 1 shown), resulting in the degradation of signal quality
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[0051] Certain terms are used in the description and claims to refer to particular elements. It should be understood by those skilled in the art that manufacturers may use different terms to refer to the same element. The specification and claims do not use the difference in name as a way to distinguish components, but use the difference in function of components as a criterion for distinguishing. "Includes" mentioned throughout the specification and claims is an open-ended term, so it should be interpreted as "including but not limited to". In addition, the term "coupled" herein includes any direct and indirect electrical connection means. Therefore, if it is described that a first device is coupled to a second device, it means that the first device may be directly electrically connected to the second device, or indirectly electrically connected to the second device through other devices or connection means.
[0052] Regarding the correcting device of the present invention,...
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The invention provides a communication system correction method and device. The method is used for the mismatching of an in-phase signal path of a receiver with an orthogonal signal path, and comprises the steps: employing the receiver to receive at least one testing signal through a first signal path and a second signal path, wherein each testing signal has a specific frequency and is within a specific bandwidth; calculating at least one correction coefficient of each testing signal, so as to correct the mismatching of the first signal path of the receiver with the second signal path of the receiver at the specific frequency corresponding to each testing signal; obtaining a tapping coefficient of a correction filter in a correction filter unit according to at least one correction coefficient of each testing signal; and correcting a received signal through employing the correction filter unit.
Description
technical field [0001] The disclosed embodiments of the present invention relate to a calibration method and a related device of a communication system, in particular to a communication applied to a transmitter / receiver where an in-phase (I) signal path does not match a quadrature (Q) signal path A system broadband calibration method and a calibration device. Background technique [0002] Generally speaking, the more complex modulation technology can usually contain more information data, that is, the transmission rate can be increased through complex modulation processing, such as 64-Quadrature Amplitude Modulation (64-Quadrature Amplitude Modulation, 64- QAM), or even 256-QAM. Therefore, the demand for high-order quadrature amplitude modulation is becoming more and more popular. If high-order quadrature amplitude modulation is expected to have a good transceiver effect, the error vector magnitude (ErrorVector Magnitude, EVM) of the communication system must be increased ...
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IPC IPC(8): H04L25/03H04L25/06
Inventor 郑景嘉
Owner REALTEK SEMICON CORP