Method and device for self-correcting emitting end I/Q modulation imbalance
A transmitter, self-calibration technology, applied in the modulation carrier system, digital transmission system, electrical components and other directions, can solve the problem that the phase cannot be guaranteed to be 90 degrees, the gain is inconsistent, the error and so on
Active Publication Date: 2015-05-06
安徽省菲特科技股份有限公司 +1
View PDF5 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0002] Digital communication technology has been widely used in the field of wireless communication. Wireless communication systems and their associated standards are constantly using more complex modulation techniques, such as QAM modulation, to increase the capacity of communication channels. Among these complex modulation techniques, transmission The in-phase I and quadrature-phase Q signals at the terminal will introduce errors after analog modulation, so that the phase difference cannot be guaranteed to be 90 degrees, the gain is inconsistent, and there will be a DC offset at the same time. The introduction of these errors will reduce the performance of the communication link
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0060] see figure 1 , in this embodiment, the imbalance between the in-phase component and the quadrature component of the modulated signal at the transmitting end is corrected, and the signals used for correction include five types of signals, and the five types of signals are respectively: the I-way signal DC offset C I , Q channel signal DC bias C Q , the sin (θ) value of the phase error θ of the Q road signal relative to the I road signal, the cos (θ) value, the magnitude error G of the Q road signal relative to the I road signal; the I road signal is the in-phase component of the modulated signal at the transmitter, The Q-channel signal is the quadrature component of the modulated signal at the transmitting end; the self-calibration method is carried out as follows:
[0061] Step 1, carry out pre-calibration to the baseband signal before the correction of I road signal and Q road signal with five kinds of signals, obtain the correction output signal I of I road signal C...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a method and device for self-correcting emitting end I / Q modulation imbalance. Through automatically detecting an envelope signal value of an emitting signal, direct-current offset of emitting end I / Q, phase error, and amplitude error of a Q-channel signal relative to an I-channel signal are self-adaptively estimated, and regulated, and the I-channel signal and the Q-channel signal of an emitting end are corrected by using the regulated direct-current offset of the emitting end I / Q, the phase error, and the amplitude error of the Q-channel signal relative to the I-channel signal until a correction output signal of the I-channel signal and a correction output signal of the Q-channel signal meet the error requirement set by technical indexes, thus self correction of the emitting end I / Q modulation imbalance is completed.
Description
technical field [0001] The invention relates to the field of signal processing and communication, in particular to a method and a device for automatically correcting the unbalanced characteristics of in-phase I and quadrature Q modulation signals at the transmitting end of a QAM system using signal processing technology. Background technique [0002] Digital communication technology has been widely used in the field of wireless communication. Wireless communication systems and their associated standards are constantly using more complex modulation techniques, such as QAM modulation, to increase the capacity of communication channels. Among these complex modulation techniques, transmission The in-phase I and quadrature-phase Q signals at the terminal will introduce errors after analog modulation, so that the phase difference cannot be guaranteed to be 90 degrees, the gain is inconsistent, and there will be a DC offset at the same time. The introduction of these errors will red...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/00H04L27/26
Inventor 陶洪吴端陈士兵赵科彭静袁振英
Owner 安徽省菲特科技股份有限公司