Data acquisition and emulation system suitable for underlying protocol stack of digital communication terminal

Abstract

The invention relates to a data acquisition and emulation system suitable for an underlying protocol stack of a digital communication terminal. The system comprises a digital signal processor (DSP), a data acquisition system, and a computer emulation system, wherein the data acquisition system comprises a field-programmable gate array (FPGA), a universal serial bus (USB) interface chip, and a memory corresponding to the FPGA and the USB interface chip; the computer emulation system comprises a computer, and a data receiving program module and a system emulation program module operated on the computer; the DSP is connected to the FPGA through an address bus, a data bus, a chip selection, and a write enable respectively; and the acquisition output end of the FPGA is connected to the data input end of the USB interface chip; and the USB interface chip is connected to the computer through a USB bus. The data acquisition and emulation system has the advantages that: the acquired data and the data input by the underlying protocol stack can be ensured to be completely consistent by directly connecting the data acquisition system with the DSP high-speed data bus; the data bus has high read and write rate and low time consumption, so that the operation of the underlying protocol stack cannot be affected; the system is suitable for the development and debugging of the underlying protocol stack so as to track and find out problems and search program defects.

Description

Technical field [0001] The present invention relates to a data acquisition and processing system of a digital communication terminal, in particular to a data acquisition and simulation system suitable for the underlying protocol stack of the digital communication terminal. Background technique [0002] With the development of software radio ideas and technologies, more and more general-purpose digital signal processors (DSP) combined with high-speed analog / digital (A / D) and digital / analog (D / A) converters are used in modern digital communication systems. Part of the data processing of the physical layer (signal modulation and demodulation) and media access layer (channel encoding and decoding) in the communication system model. In recent years, the theory of digital signal processing has developed rapidly, and the working frequency and processing capacity of digital signal processors have been continuously improved. More and more work in digital communication systems can be compl...

AI Technical Summary

Problems solved by technology

There are multiple data acquisition entry points in the entire communication system, which can directly sample the intermediate frequency signal or the baseband signal. However, in this acquisition method, the acquisition system needs to be directly connected to the analog signal path of the terminal. The distortion of the original signal caused by other reasons directly affects the normal operation of the demodulation part of the underlying protocol stack

At the same time, due to the differences of the A / D converter itself, it cannot be guaranteed that the data collected by the acquisition system is completely consistent with the input data of the DSP, so it cannot be guaranteed that the data flow will be completely consistent when reproducing the operating status of the underlying protocol stack.

Therefore, this acquisition system is not suitable for the debugging of the underlying communication protocol stack.

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