110 results about "CORDIC" patented technology

A reconfigurable floating-point arithmetic device based on CORDIC algorithm comprises a preprocessing module for completing input data from IEEE-754 standard, and maps it into the convergence region;a series-parallel hybrid reconfigurable CORDIC iterative unit module. The iterative operation part of CORDIC algorithm is composed of two parts: rotation modules A and B, wherein, the rotation moduleA is used to realize serial pipeline structure to maximize module reuse, the rotation module B is based on parallel prediction method of rotation direction and adopts tree adder structure to realize parallel structure in rotation mode; in the post-processing module, the corresponding result output is selected according to the encoded signal of the pre-processing module, and the mantissa normalization processing is completed to output the single-precision floating-point data format calculation result. The invention has the characteristics of simple principle, low delay, high precision and low hardware cost.

A system and method for solving a decision problem having Boolean combinations of linear and non-linear operations includes translating the non-linear real operations using a COordinate Rotation DIgital Computer (CORDIC) method programmed on a computer device into linear operations maintaining a given accuracy. Linear and translated linear operations are combined into a formula. Satisfiablity of the formula is solved using a decision procedure for Boolean combinations of linear operations over integers and reals.

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.

The present invention discloses a novel multi-channel timing recovery scheme that utilizes a shared CORDIC to accurately compute the phase for each tone. Then a hardware-based linear combiner module is used to reconstruct the best phase estimate from multiple phase measurements. The firmware monitors the noise variance for the pilot tones and determines the corresponding weight for each tone to ensure that the minimum phase jitter noise is achieved through the linear combiner. Then a hardware-based second-order timing recovery control loop generates the frequency reference signal for VCXO or DCXO. A single sequentially controlled multiplier is used for all multiplications in the control loop.

The invention discloses a full-pipeline floating-point trigonometric function device based on combination of CORDIC and Taylor algorithms. The device comprises a preprocessing module which is used for judging whether a taylor expansion algorithm is started or not according to an input angle Z and converting the input angle Z from a double-precision floating-point format into a fixed-point format; a cordic algorithm calculation path module which is used for finishing calculating sine and cosine results of the input angle Z, wherein when N is smaller than 13, obtained results are precise results and are output; a taylor algorithm calculation path module which is used for finishing calculating sine or cosine of the input angle Z, wherein only when the N is greater than or equal to 13, the taylor algorithm is selectively started; and a postprocessing module which is used for carrying out normalization processing on calculation results of the cordic algorithm and selectively outputting the sine and cosine calculation results. The device has the advantages of low delay, low error and full pipeline.

The invention provides a low-overhead iteration triangular function device based on a T_CORDIC (Coordinated Rotation Digital Computer) algorithm. The low-overhead iteration triangular function device comprises a pre-processing module, a rotary direction predication module, a CORDIC algorithm compressive iteration multiplexing module, a cut-off fixed-point multiplier multiplexing module, a state control module and a post-processing module, wherein the pre-processing module is used for finishing conversion of an input angle from a floating point format to a fixed point format of IEEE-754 standards and judging whether a Taylor algorithm is started or not; the rotary direction predication module is used for providing sign prediction on compressive iteration in the CORDIC algorithm and providing a multiplicator for parallel computing; the CORDIC algorithm compressive iteration multiplexing module is used for finishing calculation of front n / 2 times of compressive iteration in the CORDIC algorithm; the cut-off fixed-point multiplier multiplexing module is used for finishing the calculation of a Taylor expansion equation in the former period and finishing the calculation of parallel iteration in the CORDIC algorithm; the state control module is used for coordinating the multiplexing of the CORDIC algorithm compressive iteration multiplexing module and the cut-off fixed-point multiplier multiplexing module; and the post-processing module is used for selecting result output of a triangular function according to a result signal judged by the pre-processing module and converting the result to the floating point format of the IEEE-754 standards from a fixed point. The low-overhead iteration triangular function device based on the T_CORDIC algorithm has the advantages of simple principle, low delay, low errors, low overhead and the like.

The invention provides a channel simulator and a modeling method thereof. An SCM (space channel molding) method is used for processing large-scale fading and medium-scale fading, and correlation parameters of the large-scale fading and medium-scale fading are configured according to the selected specific scene and converted into corresponding weight constant; a small-scale fading mathematical model is expanded in accordance with the Euler's formula, the frequency shift of each path of the expanded small-scale fading mathematical model is determined by combining a given maximum frequency shift and based on a random number generation scheme of the Box-Muller algorithm, and the sine and cosine functions of the expanded small-scale fading mathematical model are calculated through the PAR-CORDIC (Coordinate Rotational Digital Computer) algorithm; Gaussian white noise is generated based on the Box-Muller algorithm; Finally, the weight constant of the large-scale fading and medium-scale fading is used for weighting the small-scale fading mathematical model and then added to the Gaussian white noise to obtain a channel simulator model. According to the channel simulator and the modeling method thereof, the modeling is quick and efficient and has the performance advantages on resource consumption, processing time and the like.