Second-order band-pass sampling clock jitter modeling method and compensation method
A second-order band-pass, clock jitter technology, applied in special data processing applications, signal generation/distribution, design optimization/simulation, etc., can solve problems affecting the normal reception of multi-mode and multi-band signals, etc., to improve anti-aliasing Performance, Effects Removal, Fixed Sample Delay for Accurate Effects
Active Publication Date: 2020-11-06
CHINA UNIV OF MINING & TECH
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Problems solved by technology
However, in the process of band-pass sampling, the problem of aliasing of useful signals in different frequency bands after sampling and the problem of aliasing of the signal's own image are common, which affects the normal reception of multi-mode and multi-band signals on the same platform
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[0031] The main purpose of this patent is to provide a software radio second-order band-pass sampling receiver with adjustable delay, which can model and analyze the phase error between the two sampling signals caused by clock jitter, including fixed parts and The part that varies with frequency, and for the utilization of the error caused by the fixed part, polynomial fitting compensation is performed on the part that varies with frequency so as to achieve the technical solution of eliminating the error.
[0032] In order to achieve the above purpose, the present invention first analyzes the clock jitter error in the second-order band-pass sampling system.
[0033] Firstly, the anti-phase interpolation method is used to measure the performance of the second-order bandpass system when separating the desired frequency signal: assuming that the input signal stream x[f] of the second-order bandpass sampling receiver of the software radio contains two signals of different frequenci...
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The invention provides a second-order band-pass sampling system clock jitter modeling method and a compensation method. According to the method, delay T delta is introduced between two sampling channels of a second-order band-pass sampling system, clock jitter in second-order band-pass sampling is modeled, a fixed part and a part changing along with frequency in clock jitter are obtained, and thepart changing along with frequency is a hardware error; hardware error compensation is performed on an output signal of second-order band-pass sampling based on a hardware error, and then for a fixedpart in clock jitter, an appropriate filter is designed based on a phase adjustment filtering algorithm to perform error compensation on the fixed part in the clock jitter. The invention can be applied to an existing phase adjustment filtering algorithm, the influence of clock jitter errors on the system can be eliminated, fixed sampling delay introduced into the system is more accurate, and therefore the anti-aliasing performance of the phase adjustment filtering algorithm is improved.
Description
technical field [0001] The invention relates to the technical field of radio band-pass sampling and software radio, in particular to a second-order band-pass sampling clock jitter modeling method and compensation method. Background technique [0002] As a method and means to realize wireless communication, software radio has been widely used in wireless communication. In the process of realizing as many functions of the software radio as possible through software algorithms, it is often necessary to study a sampling system with high flexibility and a wide sampling range to sample the radio frequency signals in its working frequency band. However, in the process of band-pass sampling, the problem of aliasing of useful signals in different frequency bands after sampling and the problem of aliasing of the signal's own image are common, which affects the normal reception of multi-mode and multi-band signals on the same platform. [0003] In order to improve the effectiveness of...
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IPC IPC(8): G06F30/20G06F1/06
CPCG06F30/20G06F1/06
Inventor 王洪梅黄子政王法广李世银许桐辉高源林东涛文梓棋姜苏
Owner CHINA UNIV OF MINING & TECH