偏信
1.listen to both sides and you will be enlightened; heed only one side and you will be benighted
3.Symbol Timing Estimation under Large Frequency Offset and Low Signal to Noise Ratio in OFDM Systems
4.This paper presents a structure based on noncoherent-SPRT algorithm for the sequence acquisition under large frequency offset and low signal to noise ratio in DS/SS systems.
5.Monte-Carlo simulations have shown that its performance was better for thedrift angle θ<5°and its CEP was less than 50m for SNR=3.
6.A good pulse encoding modulation SAW oscillator was produced in practice. The device operates at the frequency of 394 MHz,with modulated frequency deviation >200 kHz, rate of modulated signal code in excess of 400 kbit/s, output power>50 mW,temperature stability of ±50×10 -6 (-20 °C～+60 °C).
7.Optical signalnoise ratio(OSNR) is obtained from the measurement of PS and PN,and according to the relationship of OSNR and DOP,the monitoring of DOP can be implemented.
8.In view of characteristics of seismic data of gobi-sand dune areas, this paper, through various data-processing means such as quality control, high-pass filltering, dip angle filltering, field static correction, surface consistency deconvolution, precise velocity analysis, denoising before stack, multiple iterative operation of residual static correction, denoising after stack and modification after shift, has raised the data quality of seismic profiles in low signal-to-noise ratio areas and managed to form the seismic data-processing technique for such complex areas as gobi, foreland and dune.
9.Results: The scores of examination shows negtive skew distribution, the average score is 71.95,the standard deviation is 10.97, and the paper reliability is 0.999. Conclusion: The types of exam puestion are assigned fully in the examination paper.
10.This Schmitt trigger circuit can be suited to the deep sub-micron CMOS process and used to get rid of the noise on the input pad of the chip.
