Digital receiver and local oscillating frequency inceptive error calibrating method
A technology of digital receiver and local oscillator frequency, which is applied in the shaping network of the transmitter/receiver, baseband system components, etc., can solve the problems of slow calibration speed and complex system structure, and achieve fast calibration speed and low equipment investment. The effect of less and improved calibration efficiency
Inactive Publication Date: 2011-12-14
ST ERICSSON SEMICON BEIJING
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The disadvantage of this method is that it needs to use a relatively expensive spectrum analyzer, and the calibration speed is slow, and the calibration data needs to be written into the receiver by other methods, and the system structure is relatively complicated
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[0037] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
[0038] The present invention utilizes a signal generator to generate a reference tone signal. After receiving the reference tone signal, the digital receiver measures the frequency of the frequency-converted signal in the digital baseband, and calculates the receiver according to the measured digital baseband signal frequency and the reference tone signal frequency. The frequency of the local oscillator signal is calibrated according to the frequency of the local oscillator signal and the nominal frequency of the local oscillator signal, so that the initial error of the local oscillator frequency meets the requirements of system design.
[0039] Please refer to figure 1 , the method for calibrating the initial error of the local oscillator frequency...
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The invention discloses a calibration method for a digital receiver and the initial error of the vibration frequency of the digital receiver. The invention comprises the following steps that : A. a signal generator is used for generating a reference monosyllabic signal and the signal is sent to the digital receiver; B. the digital receiver mixes a vibration signal and the reference syllabic signal, after a lo-pass filter sampling of the mixed signals, performs Fourier transformation on a sampling signal to get a digital baseband signal frequency; C. the vibration signal frequency is calculated and obtained according to the digital baseband signal frequency and the reference monosyllabic frequency; D. the initial error calibration of the vibration frequency is performed according to the vibration signal frequency and a nominal vibration signal frequency. The calibration method for the digital receiver and the initial error of the vibration frequency of the digital receiver can effectively increase the calibration speed and lower the calibration cost.
Description
technical field [0001] The invention belongs to the field of wireless communication, in particular to a digital receiver and a method for calibrating the initial error of the local oscillator frequency. Background technique [0002] In a wireless communication system, in order to ensure the demodulation quality of the received signal, the digital receiver needs to ensure that the error between the local oscillator frequency of the receiver and the signal carrier frequency is less than a certain range. This range has different requirements in different systems. When it is already in the correct receiving state, the receiver can calculate the frequency deviation between the local oscillator signal and the received signal through channel estimation and adjust it in time to make the deviation between the local oscillator frequency and the carrier frequency of the received signal meet the system design requirements. [0003] For a receiver that has just started to establish a rec...
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IPC IPC(8): H04L25/03
Inventor 冯星辉杨龙波
Owner ST ERICSSON SEMICON BEIJING