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Method and device for testing and correcting the non-linear characteristics of channel

A non-linear and characteristic technology, which is applied in the field of non-linear characteristic test and compensation devices, can solve the problems of long-time testing, inability to track the change of the parameters of the sending channel in real time, and the inability to measure the nonlinearity correctly, so as to improve the tracking speed and reduce the time , Improve the effect of drawing accuracy

Inactive Publication Date: 2005-01-19
HUAWEI TECH CO LTD
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Problems solved by technology

Although this method is intuitive, it has the following disadvantages: the test takes a long time, and because the dynamic range of the input signal is generally large, the test level cannot be many, so the nonlinear curve cannot be made very fine; If the nonlinear signal of the communication channel itself is weak, this method will lead to the problem that its nonlinearity cannot be measured correctly; in addition, this method must be tested separately in the non-working state of the system, that is, it cannot be tested when the signaling channel is in the working state. Therefore, this method cannot track the parameter changes of the signaling channel in real time so that the effect of linear compensation is optimal or close to optimal at any time

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  • Method and device for testing and correcting the non-linear characteristics of channel
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  • Method and device for testing and correcting the non-linear characteristics of channel

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Embodiment Construction

[0014] Such as figure 1 As shown, the non-linear test correction device is composed of a digital part of the circuit module and an analog part of the circuit module. The digital part circuit module includes a data source module 20, a digital modulator 21, a predistorter 22, an adaptive module 32, a linear detector 23, an analog-to-digital conversion circuit 27 and a digital-to-analog conversion circuit 24; the analog part circuit module includes a transmitter (Frequency up-conversion module) 25, the non-linear component 29 which is the device to be tested, and the down-conversion module 28 which is the feedback loop module, wherein the up-conversion module 25 and the nonlinear component 29 constitute the entire nonlinear signaling channel. The frequency synthesizer 26 provides the frequency-converted local oscillator signals required by the modules 25 and 26 . The data source module 20 is a user data processing module, which receives user data and performs data channel codin...

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Abstract

The present invention relates to a method for measuring and correcting non-linear characteristics of channel and its equipment. It is characterized by that under the condition of test state it transmits dual-tone test signal, and utilizes transmission channel, receiving circuit feedback FFT and IFFT treatment to obtain required signal component, and obtain the non-linear characteristics of transmission channel and predistortion correction. The invented equipment includes the devices of testing signal generation, predistortion, D / A and A / D conversion, upper and lower frequency change power amplification, directional coupling, bandpass filter and non-linear detection, and its advantages are: can measure nonlinearity of transmission channel and system, and can raise non-linear measurement accuracy and correct tracking speed of system.

Description

technical field [0001] The invention relates to a device and method for testing and compensating nonlinear characteristics of a nonlinear signaling channel. Background technique [0002] With the application of Quadrature Amplitude Modulation (QAM), Differential Quadrature Phase Shift Keying (DQPSK) and other non-constant envelope modulation techniques in the communication field, the linearity requirements of the signaling channel are very important; but the direct use Designing a signaling channel with a device with good linearity will bring the problem of high cost. Therefore, the general practice is to use some linearization techniques to linearly compensate the signaling channel designed with a nonlinear device with better linearity. [0003] In order to test the nonlinear characteristics of the signaling channel and make linear compensation for its nonlinearity, traditional schemes such as Figure 4 As shown, the single-tone signal is used as the input signal to compare...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/309
Inventor 姚继军吴迪
Owner HUAWEI TECH CO LTD
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