Method for realizing single-precision floating-point number accumulative error control in down-conversion based on GPU (Graphics Processing Unit)

Abstract

The invention discloses a method for realizing accumulative error control in down-conversion based on a GPU (Graphics Processing Unit), which relates to the technical field of communication, and can be used for strictly controlling the accumulative error among K limited data points by analyzing the values of the frequency resolution, the actual sampling frequency and the down-conversion frequency required by engineering and calculating the relationship among the three values. And the phase value is returned to zero every K points, so that the propagation of error accumulation is prevented. According to the method, a lookup table is not used for calculating the phase value, precious on-chip memory resources are saved, the resource utilization rate is higher, accumulated errors are controlled within limited data points, and error accumulation is smaller. According to the method for calculating the accumulation of the control errors of the down-conversion based on the GPU, aiming at the relation between the local frequency of the down-conversion and the sampling frequency, the accuracy requirement is met while the frequency of the down-conversion is ensured to be flexible and variable, and calculation results show that the accumulation errors can be effectively controlled at the order of magnitude of 1e-8.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method for controlling cumulative error of single-precision floating-point numbers in down-conversion based on GPU, and a method for controlling cumulative error of single-precision floating-point numbers in down-conversion based on GPU. Background technique [0002] In traditional aerospace measurement and control systems and deep space exploration systems, the receiving end usually includes a radio frequency receiving unit, an analog-to-digital converter (Analog-to-digital converter, ADC), a digital down-converter unit (Digital DownConverter, DDC), a filter extraction unit, Baseband processing unit. The radio frequency receiving unit receives and converts the electromagnetic signal into an electrical signal, which is filtered and amplified to a certain amplitude range. The analog-to-digital conversion unit converts the received analog signal into a digital signal. Th...

AI Technical Summary

Problems solved by technology

Although this method normalizes the end value of each piece of data to within 2π, the error accumulation still exists and is passed to the next piece of data. The error accumulation is transmitted layer by layer between data sections, which is uncontrollable. The calculation results are corrected and calculated, which increases the computational complexity and reduces the computational efficiency

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