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Coordinate rotation digital calculation device and method

A technology of coordinate rotation and digital calculation, applied in digital computer parts, calculations, computers, etc., can solve the problems of long operation time and high power consumption.

Pending Publication Date: 2020-06-12
MSTAR SEMICON INC
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Problems solved by technology

However, if the phase of the coordinates corresponding to the input signal is large, the coordinate rotation digital calculator will need to perform more iterations to make the orthogonal component (imaginary part) of the rotated coordinates approximate to 0, resulting in a longer operation time and more power consumption

Method used

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  • Coordinate rotation digital calculation device and method
  • Coordinate rotation digital calculation device and method
  • Coordinate rotation digital calculation device and method

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Embodiment Construction

[0041] The present invention first performs a pre-processing on the coordinates so that the phase of the pre-processed coordinates (referred to as the pre-coordinates) is within a specific range, and then performs coordinate rotation digital calculation operations on the pre-processed coordinates. , so as to reduce the number of iterations of the subsequent phase rotation to reduce the time required for operation and power consumption.

[0042] figure 1 It is a block diagram of a coordinate rotation digital computing device 10 according to an embodiment of the present invention, figure 2 It is a flowchart of a coordinate rotation digital calculation method 20 according to an embodiment of the present invention. The coordinate rotation digital calculation device 10 is used to calculate a phase θ of a coordinate s, the coordinate s includes a first component s I and a second component s- Q , the phase θ of the coordinate s can be expressed as θ=tan -1 (s- Q / s I ). For e...

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Abstract

A coordinate rotation digital calculation device is used for calculating a phase of a coordinate, and comprises a preprocessing circuit which determines whether to rotate the coordinate by a rotationangle according to the coordinate so as to generate a preposed coordinate; a coordinate rotation digital calculator which is used for calculating a preposed phase of the preposed coordinate accordingto the preposed coordinate; and the post-processing circuit compensates the preposed phase according to the rotation angle so as to generate the phase of the coordinate.

Description

technical field [0001] The present invention refers to a coordinate rotation digital calculation device and method, in particular to a coordinate rotation digital calculator and method that can reduce the number of iterations. Background technique [0002] The Coordinate Rotation Digital Computer (CORDIC) is characterized in that it can recursively (Recursively) perform phase rotation on a signal / coordinate, and the tangent (Tangent) function value of the phase rotation angle in each iteration is the value of the previous 1 / 2 of the value of the tangent function of the phase rotation angle in recursion / iteration, and in a digital circuit, the shifter can be used to shift k bits to the right to achieve multiplication by 1 / 2 k Therefore, the coordinate rotation digital calculator can be realized by simply using an adder and a shifter without using a multiplier, and has the advantage of a simple circuit structure. [0003] In other words, the coordinate rotation digital calcul...

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Application Information

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IPC IPC(8): G06F15/02
CPCG06F15/0225
Inventor 伯纳德·金纳堤郑有财王俊杰童泰来廖根良林奕劭张量凯
Owner MSTAR SEMICON INC
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