Digital phase detection method and device based on improved cordic algorithm
A digital phase detection and algorithm technology, applied in the direction of multi-carrier systems, etc., can solve the problems of low accuracy of phase detection and large error of phase detection results, and achieve the effect of improving accuracy and accuracy
Active Publication Date: 2017-05-24
HOHAI UNIV
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[0018] In order to solve the problems existing in the background technology, the present invention aims to provide a digital phase detection method and device based on the improved CORDIC algorithm, which solves the problem that the error of the phase detection result is large and the phase detection is accurate when the modulus value of the input quadrature signal is small low degree problem
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[0035] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0036] The CORDIC algorithm is often used for digital phase identification. The traditional digital phase identification method based on the CORDIC algorithm is:
[0037] (1) Perform analog-to-digital conversion on the analog input signal to obtain a corresponding sampling digital signal;
[0038] (2) Perform digital down-conversion processing on the sampled digital signal to obtain the baseband video I / Q signal s B(n), thereby obtaining its in-phase component signal I (n) and quadrature component signal Q (n);
[0039] (3) Defined separately ε 0 = π / 4, and (x 0 ,Δy 0 ,z 0 ),δ 0 , ε 0 The initial state, initial rotation direction, and initial rotation angle of the traditional CORDIC algorithm are respectively used for iterative calculation until the iterative result meets the accuracy requirements, and the phase information of the ...
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The invention discloses a digital phase discrimination method and device based on improved CORDIC (coordinated rotation digital computer) algorithm. The method comprises the following steps: firstly performing analog-to-digital conversion on an analog input signal to obtain a corresponding sampling digital signal; secondly, performing digital down conversion on the sampling digital signal to obtain a base band video I / Q signal; and finally, using the base band video I / Q signal in the step (2) as initial data of the improved CORDIC algorithm, performing iterative operation until the iterative result meets the accuracy requirement, and extracting phase information of the analog input signal from the iterative result. The problems that the phase discrimination result has great error and the phase discrimination accuracy is low under the condition that the module value of an input orthogonal signal is small are solved.
Description
technical field [0001] The invention belongs to the field of digital signal processing, and in particular relates to a digital phase discrimination method and device based on an improved CORDIC algorithm. Background technique [0002] In the traditional analog phase detection circuit, because the frequency characteristic of the analog device generally changes with the change of environmental factors such as temperature, and when there are many analog devices in the circuit, the accuracy of the phase detection and the reliability of the circuit work must be limited. Not guaranteed. With the development of digital sampling technology and the wide use of digital processing devices, it is possible to perform digital phase detection on the sampled digital signal. The reliability of digital circuit operation is less affected by environmental factors such as temperature, and the application of appropriate algorithms can improve The accuracy of phase identification. [0003] In th...
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IPC IPC(8): H04L27/34
Inventor 高杨蒋德富徐玉超
Owner HOHAI UNIV