Link calibration method and device

Abstract

The invention discloses a method for the correction of link and a device thereof, the technique comprises: the relationship between the output powers of TD-SCDMA signals through a Rayleigh fading channel and the output powers of the signal through a static channel is obtained according to the requirement of performance test to the characteristic of a channel simulator, the single-path output powers of the signals through the static channel without delay or relatively average power attenuation are obtained by utilizing the relationship; the single-path link loss of the continuous wave signals through the static channel is obtained, the obtained link loss is used as the link loss of the channel; and the input powers of the TD-SCDMA signals of the link are obtained by the sum of the single-path output powers of the signals through the static channel without delay or relatively average power attenuation and the link loss of the channel. With the technical proposal provided by the invention, the channel simulator has fast correction time, high efficiency, simple correction platform, high precision as well as simple and feasible implementing in the complicated environment.

Description

technical field [0001] The invention relates to the communication field, in particular to link calibration technology. Background technique [0002] In the land mobile communication system, the radio frequency signal is transmitted in the wireless channel, which is a complex multipath fading channel. In order to ensure the stability and reliability of communication in the multipath fading channel, it is necessary to resist the wireless transmission equipment Multipath performance was tested. [0003] In order to test the anti-multipath performance of wireless transmission equipment, it is necessary to specify the signal input power of the terminal equipment. The direct purpose of link calibration is to enable the signal generator to output a fixed power signal, which reaches the terminal equipment after passing through the channel simulator, combiner and circulator set to a certain multipath fading state. The signal power of the terminal equipment must comply with the regu...

AI Technical Summary

Problems solved by technology

[0008] (1), the efficiency of calibration is low:

[0009] Since the sum of the output signal waveforms of the multipath Rayleigh fading channel has a Rayleigh distribution envelope, and the output signal of the Rayleigh fading channel changes rapidly, in order to obtain accurate output power, the scanning of the spectrum analyzer should be greatly increased Time measurement of the output power of the link signal passing through Rayleigh fading to obtain the effective average output power, so that the spectrum analyzer can accurately measure the output power of the channel signal passing through Rayleigh fading, but the scanning time of the spectrum analyzer is at the second level, at least Dozens of seconds, up to hundreds of seconds, greatly affects the performance test efficiency of multipath fading, time-consuming and labor-intensive

[0010] (2) The accuracy of calibration is poor:

[0011] Since the downlink TD-SCDMA output signal passing through the Rayleigh fading channel fluctuates greatly with time, the spectrum analyzer cannot accurately measure the output power of the downlink TD-SCDMA output signal passing through the Rayleigh fading channel in a relatively short period of time. The setting of the scan time greatly affects the accuracy of the calibration

[0012] (3) The complexity of realizing calibration is high:

[0013] The TD-SCDMA signal is a code division multiple access (CDMA, Code Division Multiple AccessCDMA) signal modulated by quadrature phase shift keying (QPSK, Quadrature Phase ShiftKeying QPSK), and the output power envelope of the CDMA signal is not constant. To obtain the average effective power, the spectrum analyzer needs to perform root mean square (RMS, Root Meam Square) detection to measure its effective output power. At the same time, the TD-SCDMA signal is a time division multiple access signal, which increases the complexity of the calibration process.

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