Trigonometric function CORDIC iteration operation coprocessor and operation processing method thereof

Abstract

The invention relates to a trigonometric function coordinate rotation digital computer (CORDIC) iteration operation coprocessor. The coprocessor comprises a CORDIC iteration operation unit, an operation result output unit and an angle range conversion unit, wherein the CORDIC iteration operation unit performs CORDIC iteration operation according to an input angle and outputs an operation result to the operation result output unit; the angle range conversion unit divides the input angle by pi / 2 in the CORDIC iteration operation unit to obtain a quotient and decomposes the quotient into an m part, an n part and a p part; the quotient is 4*m+n+p, m and n are integers, n is more than or equal to 0 and less than or equal to 3, and p is a floating-point number of less than 1; and the CORDIC iteration operation unit performs CORDIC trigonometric function iteration operation on the value of p*pi / 2. Through the technical scheme, the trigonometric function CORDIC iteration operation coprocessor supports full-angle trigonometric function operation and has higher operation efficiency.

Description

technical field [0001] The invention relates to a trigonometric function CORDIC iterative operation coprocessor and an operation processing method, in particular to a wireless communication signal floating-point coprocessor including trigonometric function operation. Background technique [0002] At present, the floating-point coprocessors widely used in wireless communication signal processing generally support trigonometric function operations such as sine, cosine, and tangent, and the Cordic algorithm is generally used for coprocessor design. The Cordic algorithm was developed by J.E Volder and named Coordinate Rotation Digital Computer, and it perfected the operations of multiplication, division, logarithm and exponential by extending from circular rotation to rectangular and hyperbolic coordinates. The Cordic algorithm provides a unified way to realize various basic functions, so it has been widely used in the fields of computer and communication. [0003] The Cordic a...

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Problems solved by technology

[0028] For the operation of the above trigonometric functions, the input data of the operation will be limited by the input angle of the Cordic algorithm. According to the analysis of the Cordic algorithm, the iterative operation under the circular coordinates will converge when the input angle is between -99.7 and 99.7. , so the general design will limit the input angle within this range, and the operation restrictions on trigonometric functions are very large

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