基于2.4GHz的數(shù)字基帶系統(tǒng)設(shè)計(jì)與實(shí)現(xiàn)
[Abstract]:With the rapid development of urban traffic in China, the number of expressway construction and the coverage area are increasing. At present, the construction of intelligent charging system has been put on the agenda in several domestic cities. This paper is devoted to the research of digital baseband system in intelligent toll collection system, and designs and implements a digital baseband system compatible with ZigBee and Bluetooth protocol. This paper first designs the architecture of 2.4GHz digital baseband system, which includes analog front end, digital baseband, register, protocol processing and I / O modules. The digital baseband module is composed of sending subsystem and receiving subsystem. Based on this architecture, a digital baseband transmission subsystem is designed by using Verilog HDL (hardware description language, hardware description language. The subsystem is composed of five modules, PPDU,symbol-to-chip,chip-to-precode,CRC and whitening. Using symbol-to-chip and chip-to-precode technology to complete symbol change and frequency modulation, the compatibility of ZigBee protocol and Bluetooth protocol is realized. The simulation results show that the transmitting module transmits 2 megabits of data per second using the clock frequency of 16MHz. A digital baseband receiving subsystem is designed by using Verilog HDL hardware description language. The subsystem consists of six modules: downconversion, low-pass filtering, differential demodulation, packet detection, frame synchronization and frame analysis. Among them, demodulation is realized by downconversion, low-pass filtering and differential demodulation, and clock frequency switching from 32MHz to 16MHz is completed. Decoding is realized by packet detection, frame synchronization and frame analysis, and data storage is completed. The simulation results show that the 16MHz clock frequency can receive 2 megabits of data per second. Finally, based on the realization of the digital baseband system, the system function is simulated and verified by the VCS tool of Synopsys Company. The simulation results show that the system realizes the functions of sending and receiving compatible ZigBee protocol and Bluetooth protocol. And when the clock frequency of 16MHz is adopted, the data stream per second can reach 2 Mbit, which meets the design requirements. It lays a foundation for the research of short-range wireless communication system and has certain reference value.
【學(xué)位授予單位】:西安電子科技大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類號(hào)】:TN92
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