Aimed at the request for multi-frequency point、low phase noise in UAV(Unmanned Air Vehicle)telemetry receiver local oscillator,some principle and problems with integer divider and traditional fractional divider are analyzed.

On the base of analyzing convention digit PLL of frequency shifting feedback in detail, the digit PLL indirect frequency synthesizer of low phase noise including multiple phase feedback, double feedback and phase noise elimination are provided, theory analysis and discussion are given in detail in this paper.

The τ-p transform is one of the important techniques to eliminate coherent noises and separate wave fields,but the operator aliasing artifacts and edge effect artifacts affect its resolution,therefore the conventional τ-p transform can t be used simply.

It is necessary to remove coherent noises and random noises in seismic data processing in order to improve the signal-to-noise ratio.

An optimal design criterion for parameters OFDM systems parameters under phase noise;

Performance analysis on the spatially correlated MIMO-OFDM systems in the presence of phase noise and channel estimation error;

Modified Leeson formula and low phase noise oscillator design;

Estimation of time delay by using weighted high-order cumulant on correlated noise;

DOA estimation algorithm for coherent signals based on diagonal loading in presence of correlated noises

To deal with the spatially correlated noise,a detection method based on Fuzzy-c-Means(FCM) clustering algorithm is proposed,which uses canonical correlation coefficients of the joint covariance matrix as the feature to be classified.

Discrete-time linear estimation with correlated noises;

Based on the Kalman filtering,the unified white noise estimators are presented for time-invariant systems with correlated noises.

Simulation results verified the superiority of the new proposed algorithm in the general correlated noises.