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Based on wavelet transform VWDK modulated signal noise suppression technology research

Author: ZhengQiang
Tutor: SunZhiGuo
School: Harbin Engineering University
Course: Communication and Information System
Keywords: Very small waveform difference keying (VWDK) Efficient modulation Wavelet Transform Noise suppression
CLC: TN911.4
Type: Master's thesis
Year: 2010
Downloads: 32
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Abstract


With the surge in demand for communication capacity and electromagnetic spectrum resources are becoming scarce , with a high frequency band utilization of new wireless communications technology become a research hotspot . UNB (Utral Narrow Band, UNB) modulation technology is a new wireless digital modulation techniques ; due UNB modulated signal energy is concentrated in a very narrow band , which has a very high bandwidth efficiency , UNB modulation technology is expected to become high rates of band-limited digital communication system core technology. UNB modulation technique at the expense of the high-frequency band utilization of its noise suppression capability for the price, therefore , the conventional communication system UNB noise suppression capability is weak , the channel and low adaptive capacity . UNB communications system in order to improve noise suppression capability , the paper selected waveform difference keying very small (Very-minimum Waveform Difference Keying, VWDK) for the study, the analysis VWDK modulated signal on the basis of technical characteristics , focusing on VWDK modulated signals noise suppression method . First, the characteristics for the UNB technology introduced VWDK the basic theory , the mathematical model of the system is given to study the VWDK modulated signal waveform design , from the mathematical theory analyzes the technical characteristics VWDK modulation techniques , and simulation platform further analysis of the signal power spectrum obtained signal optimization possibilities ; simulation results show that after optimization of the signal does not degrade system performance further improved on the basis of spectrum utilization. Then, for VWDK modulated signal characteristics , explores the additive and multiplicative interference for VWDK modulation system performance. And explores the Gaussian white noise channel and multipath fading channel , VWDK modulation system BER performance . Simulation results show that noise and multipath interference modulation system for VWDK has great influence on system performance , system performance degradation is caused by a major factor . Finally, the noise suppression for VWDK weak communication system problems , use VWDK modulated signal and background noise characteristic differences in wavelet domain is proposed based on wavelet transform VWDK noise suppression method , given the principle of noise suppression and mathematical model to analyze the its performance. The simulation results show that after wavelet processing , the system must be improved noise suppression performance .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Communication theory > Noise and interference
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