Gaussian filtered minimum shift keying (GSMK) digital demodulation error metering method
A measurement method and digital demodulation technology, applied in phase modulated carrier systems, shaping networks in transmitter/receiver, baseband system components, etc. And other issues
Inactive Publication Date: 2014-04-09
TELECOMM METROLOGY CENT OF MINIST OF IND & INFORMATION TECH +1
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Problems solved by technology
[0016] This patent aims to solve the problem of closed-loop operation of metering work, which is easy to cause error cycle and accumulation, and it is difficult to ensure accuracy and reliability, with respect to GMSK, a very widely used modulation method, and to carry out different signals within a certain range. Error setting, to obtain different measurement values, so that the measurement results are more in line with actual needs
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[0044] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments and accompanying drawings.
[0045] The symbol rate of the GMSK signal is R s , and the symbol sequence is 101010..., then when the Gaussian filter BT=0.3, the GMSK signal is a sinusoidal phase-modulated signal with a modulation frequency of 0.5R s , and the modulation index is 0.2431. This conclusion is the basis for subsequent error construction and source tracing. The following will prove this conclusion. A brief proof flow chart such as figure 2 shown.
[0046] Such as figure 2 As shown, the baseband signal g(t) waveform corresponding to the sequence 10101 is a bipolar square wave pulse, and the pulse width is the symbol period T of GMSK s , the Fourier series form of this waveform is:
[0047] g ( t ) ...
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The invention relates to a Gaussian filtered minimum shift keying (GSMK) digital demodulation error metering method and a system. The metering method comprises the steps of: 1) taking a phase modulation (PM) signal as a standard GSMK signal; 2) setting 0.5Rs difference value delta f by setting the modulation frequency and standard of the PM signal, and setting the capture length N of a vector signal analyzer at the same time, wherein the N and the delta f satisfy a certain constraint relation; 3) establishing an analytic relation between the frequency parameter delta f and a modulation error parameter; and 4) comparing the calculable digital modulation error parameter with a value measured by the vector signal analyzer to realize the metering and calibration of a GMSK demodulation error parameter. The metering system provided by the invention comprises an analog signal generator, a power divider, a tunable receiver and a measured vector signal analyzer. The method and the system provided by the invention can be used for metering and calibrating the digital demodulation errors of vector signal analyzers and mobile communication comprehensive testers with a GMSK analysis and demodulation function, and can be widely used.
Description
technical field [0001] The invention relates to wireless communication and radio and television information transmission technology, especially the measurement of GMSK signal modulation error used in the design of the second generation mobile communication system. Background technique [0002] Acronyms and key term definitions [0003] PhaseErrRms, phase error root mean square value [0004] PhaseErrPeak, phase error peak value [0005] EvmRms, error vector magnitude rms [0006] EvmPeak Error vector magnitude peak value [0007] MagErr magnitude error [0008] PM signal. PM signal [0009] Digitally modulated signals have become an important cornerstone of the information society and the main carrier of information transmission. The most typical application is in wireless communication and broadcast television systems, such as the GMSK signal used by the second generation mobile communication system. The number of mobile phone users based on this signal exceeds 1 bil...
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IPC IPC(8): H04L25/03H04L27/22
Inventor 周峰张睿陆冰松王南卢民牛郭隆庆李耀华冉志强张小雨孙景禄张媛媛牟丹王赣
Owner TELECOMM METROLOGY CENT OF MINIST OF IND & INFORMATION TECH