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The Research of Key Technologies and Implementation of Communication Systems Based on Super Low Frequency MSK and Tamed Spread Spectrum

Author: YangPeng
Tutor: GuoLiLi
School: Harbin Engineering University
Course: Communication and Information System
Keywords: Super Low Frequency MSK Tamed Spread Spectrum Low Signal to Noise Ratio System Synchronization Power Frequency Interference FPGA
CLC: TN914.42
Type: Master's thesis
Year: 2013
Downloads: 36
Quote: 0
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Abstract


With the increasing demand for natural resources, it has begun to deep underground aswell as deep-sea mineral resources and the development and utilization of marine resources,while the super low frequency wireless communication technology is the convenience andeffective way of communication to remote and telemetry machinery and equipment thatdevelop resources. The features of super low frequency wireless communication are narrowcommunication bandwidth, various big natural noise in the channel and have power frequencyinterference. Base on this, the paper use Minimum Shift Keying(MSK)tamed spreadspectrum communication way to achieve super low frequency wireless communication in lowsignal to noise ratio, research the key technology of super low frequency MSK tamed spreadspectrum communication, and propose the system design and implementation of hardwareand software platforms.First, construct the super low frequency tamed spread spectrum communication systemmodel, and research the key technology such as system synchronization and power frequencyinterference filter, give the improved match filter synchronization method based on FPGA,which can achieve carrier and symbol synchronization of MSK spread spectrum signal at thesame time, and without loss of the synchronization accuracy reduce the sampling rate andresource consumption, as while as give the coherent template notch method in order toachieve notch50Hz and60Hz power frequency interference and its harmonics.Second, simulate and analysis the system, and give the tamed spread spectrum codegroup using GOLD code group balance interception, find the relationship between theoreticalparameters and actual indicators for Gaussian white noise generation using Box-Mullertransformation method, then give the BER performance of system simulation.Then, in order to verify the super low frequency MSK tamed spread spectrumcommunication system, propose the program of building a system hardware platform, designand implement the transmitter and receiver platform using FPGA as core processor, and thendesign the program and implement modules of software algorithms.Finally, based on completing the implementation of the system hardware and software,test the system and the test results verify the theoretical simulations, prove the feasibility of the system design, satisfy the functional requirements and technical indicators of design, andthis provide a reference for the practical application.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Communication systems ( transmission system) > Frequency hopping spread spectrum communication system > Spread spectrum communication
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