Error vector magnitude determination method and device, signal transmitter
A technology of error vector magnitude and determination method, which is applied in transmitter monitoring and other directions, and can solve problems such as magnitude, phase, and frequency errors
Active Publication Date: 2016-08-03
NANTONG TIANYUAN SAFETY DEVICE
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However, these modulation methods are non-constant envelope modulation methods. Since there are errors in various aspects such as amplitude, phase, and frequency, evaluation of one aspect alone is not enough to reflect the modulation accuracy, so a method that can fully measure the signal amplitude is needed. Indicators of error and phase error
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[0090] The basic idea of the present invention is: by expressing the expression of the error vector magnitude by the EVM of related parameters such as carrier leakage, IQ gain imbalance, IQ phase imbalance, local oscillation phase noise, nonlinear power amplification, etc., the carrier leakage can be determined intuitively. , IQ gain imbalance, IQ phase imbalance, local oscillator phase noise, nonlinear power amplification and other related parameters affect EVM.
[0091] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail by citing the following embodiments and referring to the accompanying drawings.
[0092] figure 1 A schematic diagram to illustrate the meaning of EVM, such as figure 1 As shown, the error vector E refers to the vector difference between the actual transmitted signal Z and the ideal error-free signal R at a given moment. As the time changes, the error v...
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The invention discloses an error vector amplitude determining method, wherein the method comprises the following steps of: adding non-ideal characteristic parameters for a signal in the signal modulation process, and transmitting a modulated signal; demodulating the transmitted signal; and determining an EVM (Error Vector Magnitude) according to the demodulated signal and ideal demodulated signals. Simultaneously, the invention discloses an error vector amplitude determining device, which comprises a modulating unit, a transmitting unit, a demodulating unit and a determining unit, wherein the modulating unit is used for adding the non-ideal characteristic parameters for the signal in the signal modulation process, the transmitting unit is used for transmitting the modulated signal, the demodulating unit is used for demodulating the transmitted signal, and the determining unit is used for determining the EVM according to the demodulated signal and the ideal demodulated signals. The invention further discloses a signal transmitter. The performances of each relational processing unit in the transmitter can be designed according to the analysis result of the EVM and the excellent transmitter can be designed so that the transmitting performances of the devices using the transmitters can be ensured; and the signal transmitter has good directive function for theoretical research or engineering practice.
Description
technical field [0001] The invention relates to an error vector magnitude (EVM, ErrorVectorMagnitude) analysis technology, in particular to a method and device for determining an error vector magnitude, and a signal transmitter. Background technique [0002] With the rapid development of wireless communication technology and the continuous improvement of data transmission rate, wireless spectrum resources are becoming more and more scarce. In order to improve spectrum utilization, realizing high-speed and large-capacity information transmission on scarce spectrum resources is a common means in the communication field. At present, most communication systems use digital modulation methods with high spectrum efficiency, such as 64 quadrature amplitude modulation (QAM, Quadrature Amplitude Modulation), 16QAM, and the like. Compared with the traditional modulation method, the new modulation method has greatly improved both the data transmission rate and the spectral efficiency. ...
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IPC IPC(8): H04B17/15
Inventor 支周杨瑞明黄栋
Owner NANTONG TIANYUAN SAFETY DEVICE